Merging upstream version 1.76.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

21 files changed, 5876 insertions, 0 deletions

diff --git a/vendor/nix/test/sys/mod.rs b/vendor/nix/test/sys/mod.rs
new file mode 100644
index 000000000..20312120a
--- /dev/null
+++ b/vendor/nix/test/sys/mod.rs
@@ -0,0 +1,60 @@
+mod test_signal;
+
+// NOTE: DragonFly lacks a kernel-level implementation of Posix AIO as of
+// this writing. There is an user-level implementation, but whether aio
+// works or not heavily depends on which pthread implementation is chosen
+// by the user at link time. For this reason we do not want to run aio test
+// cases on DragonFly.
+#[cfg(any(
+    target_os = "freebsd",
+    target_os = "ios",
+    all(target_os = "linux", not(target_env = "uclibc")),
+    target_os = "macos",
+    target_os = "netbsd"
+))]
+mod test_aio;
+#[cfg(not(any(
+    target_os = "redox",
+    target_os = "fuchsia",
+    target_os = "haiku"
+)))]
+mod test_ioctl;
+#[cfg(not(target_os = "redox"))]
+mod test_mman;
+#[cfg(not(target_os = "redox"))]
+mod test_select;
+#[cfg(target_os = "linux")]
+mod test_signalfd;
+#[cfg(not(any(target_os = "redox", target_os = "haiku")))]
+mod test_socket;
+#[cfg(not(any(target_os = "redox")))]
+mod test_sockopt;
+mod test_stat;
+#[cfg(any(target_os = "android", target_os = "linux"))]
+mod test_sysinfo;
+#[cfg(not(any(
+    target_os = "redox",
+    target_os = "fuchsia",
+    target_os = "haiku"
+)))]
+mod test_termios;
+mod test_uio;
+mod test_wait;
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+mod test_epoll;
+#[cfg(target_os = "linux")]
+mod test_inotify;
+mod test_pthread;
+#[cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "openbsd"
+))]
+mod test_ptrace;
+#[cfg(any(target_os = "android", target_os = "linux"))]
+mod test_timerfd;
diff --git a/vendor/nix/test/sys/test_aio.rs b/vendor/nix/test/sys/test_aio.rs
new file mode 100644
index 000000000..5035b5a08
--- /dev/null
+++ b/vendor/nix/test/sys/test_aio.rs
@@ -0,0 +1,624 @@
+use std::{
+    io::{Read, Seek, Write},
+    ops::Deref,
+    os::unix::io::AsRawFd,
+    pin::Pin,
+    sync::atomic::{AtomicBool, Ordering},
+    thread, time,
+};
+
+use libc::c_int;
+use nix::{
+    errno::*,
+    sys::{
+        aio::*,
+        signal::{
+            sigaction, SaFlags, SigAction, SigHandler, SigSet, SigevNotify,
+            Signal,
+        },
+        time::{TimeSpec, TimeValLike},
+    },
+};
+use tempfile::tempfile;
+
+pub static SIGNALED: AtomicBool = AtomicBool::new(false);
+
+extern "C" fn sigfunc(_: c_int) {
+    SIGNALED.store(true, Ordering::Relaxed);
+}
+
+// Helper that polls an AioCb for completion or error
+macro_rules! poll_aio {
+    ($aiocb: expr) => {
+        loop {
+            let err = $aiocb.as_mut().error();
+            if err != Err(Errno::EINPROGRESS) {
+                break err;
+            };
+            thread::sleep(time::Duration::from_millis(10));
+        }
+    };
+}
+
+mod aio_fsync {
+    use super::*;
+
+    #[test]
+    fn test_accessors() {
+        let aiocb = AioFsync::new(
+            1001,
+            AioFsyncMode::O_SYNC,
+            42,
+            SigevNotify::SigevSignal {
+                signal: Signal::SIGUSR2,
+                si_value: 99,
+            },
+        );
+        assert_eq!(1001, aiocb.fd());
+        assert_eq!(AioFsyncMode::O_SYNC, aiocb.mode());
+        assert_eq!(42, aiocb.priority());
+        let sev = aiocb.sigevent().sigevent();
+        assert_eq!(Signal::SIGUSR2 as i32, sev.sigev_signo);
+        assert_eq!(99, sev.sigev_value.sival_ptr as i64);
+    }
+
+    /// `AioFsync::submit` should not modify the `AioCb` object if
+    /// `libc::aio_fsync` returns an error
+    // Skip on Linux, because Linux's AIO implementation can't detect errors
+    // synchronously
+    #[test]
+    #[cfg(any(target_os = "freebsd", target_os = "macos"))]
+    fn error() {
+        use std::mem;
+
+        const INITIAL: &[u8] = b"abcdef123456";
+        // Create an invalid AioFsyncMode
+        let mode = unsafe { mem::transmute(666) };
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        let mut aiof = Box::pin(AioFsync::new(
+            f.as_raw_fd(),
+            mode,
+            0,
+            SigevNotify::SigevNone,
+        ));
+        let err = aiof.as_mut().submit();
+        err.expect_err("assertion failed");
+    }
+
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn ok() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        let fd = f.as_raw_fd();
+        let mut aiof = Box::pin(AioFsync::new(
+            fd,
+            AioFsyncMode::O_SYNC,
+            0,
+            SigevNotify::SigevNone,
+        ));
+        aiof.as_mut().submit().unwrap();
+        poll_aio!(&mut aiof).unwrap();
+        aiof.as_mut().aio_return().unwrap();
+    }
+}
+
+mod aio_read {
+    use super::*;
+
+    #[test]
+    fn test_accessors() {
+        let mut rbuf = vec![0; 4];
+        let aiocb = AioRead::new(
+            1001,
+            2, //offset
+            &mut rbuf,
+            42, //priority
+            SigevNotify::SigevSignal {
+                signal: Signal::SIGUSR2,
+                si_value: 99,
+            },
+        );
+        assert_eq!(1001, aiocb.fd());
+        assert_eq!(4, aiocb.nbytes());
+        assert_eq!(2, aiocb.offset());
+        assert_eq!(42, aiocb.priority());
+        let sev = aiocb.sigevent().sigevent();
+        assert_eq!(Signal::SIGUSR2 as i32, sev.sigev_signo);
+        assert_eq!(99, sev.sigev_value.sival_ptr as i64);
+    }
+
+    // Tests AioWrite.cancel.  We aren't trying to test the OS's implementation,
+    // only our bindings.  So it's sufficient to check that cancel
+    // returned any AioCancelStat value.
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn cancel() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let mut rbuf = vec![0; 4];
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        let fd = f.as_raw_fd();
+        let mut aior =
+            Box::pin(AioRead::new(fd, 2, &mut rbuf, 0, SigevNotify::SigevNone));
+        aior.as_mut().submit().unwrap();
+
+        aior.as_mut().cancel().unwrap();
+
+        // Wait for aiow to complete, but don't care whether it succeeded
+        let _ = poll_aio!(&mut aior);
+        let _ = aior.as_mut().aio_return();
+    }
+
+    /// `AioRead::submit` should not modify the `AioCb` object if
+    /// `libc::aio_read` returns an error
+    // Skip on Linux, because Linux's AIO implementation can't detect errors
+    // synchronously
+    #[test]
+    #[cfg(any(target_os = "freebsd", target_os = "macos"))]
+    fn error() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let mut rbuf = vec![0; 4];
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        let mut aior = Box::pin(AioRead::new(
+            f.as_raw_fd(),
+            -1, //an invalid offset
+            &mut rbuf,
+            0, //priority
+            SigevNotify::SigevNone,
+        ));
+        aior.as_mut().submit().expect_err("assertion failed");
+    }
+
+    // Test a simple aio operation with no completion notification.  We must
+    // poll for completion
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn ok() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let mut rbuf = vec![0; 4];
+        const EXPECT: &[u8] = b"cdef";
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        {
+            let fd = f.as_raw_fd();
+            let mut aior = Box::pin(AioRead::new(
+                fd,
+                2,
+                &mut rbuf,
+                0,
+                SigevNotify::SigevNone,
+            ));
+            aior.as_mut().submit().unwrap();
+
+            let err = poll_aio!(&mut aior);
+            assert_eq!(err, Ok(()));
+            assert_eq!(aior.as_mut().aio_return().unwrap(), EXPECT.len());
+        }
+        assert_eq!(EXPECT, rbuf.deref());
+    }
+
+    // Like ok, but allocates the structure on the stack.
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn on_stack() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let mut rbuf = vec![0; 4];
+        const EXPECT: &[u8] = b"cdef";
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        {
+            let fd = f.as_raw_fd();
+            let mut aior =
+                AioRead::new(fd, 2, &mut rbuf, 0, SigevNotify::SigevNone);
+            let mut aior = unsafe { Pin::new_unchecked(&mut aior) };
+            aior.as_mut().submit().unwrap();
+
+            let err = poll_aio!(&mut aior);
+            assert_eq!(err, Ok(()));
+            assert_eq!(aior.as_mut().aio_return().unwrap(), EXPECT.len());
+        }
+        assert_eq!(EXPECT, rbuf.deref());
+    }
+}
+
+#[cfg(target_os = "freebsd")]
+#[cfg(fbsd14)]
+mod aio_readv {
+    use std::io::IoSliceMut;
+
+    use super::*;
+
+    #[test]
+    fn test_accessors() {
+        let mut rbuf0 = vec![0; 4];
+        let mut rbuf1 = vec![0; 8];
+        let mut rbufs =
+            [IoSliceMut::new(&mut rbuf0), IoSliceMut::new(&mut rbuf1)];
+        let aiocb = AioReadv::new(
+            1001,
+            2, //offset
+            &mut rbufs,
+            42, //priority
+            SigevNotify::SigevSignal {
+                signal: Signal::SIGUSR2,
+                si_value: 99,
+            },
+        );
+        assert_eq!(1001, aiocb.fd());
+        assert_eq!(2, aiocb.iovlen());
+        assert_eq!(2, aiocb.offset());
+        assert_eq!(42, aiocb.priority());
+        let sev = aiocb.sigevent().sigevent();
+        assert_eq!(Signal::SIGUSR2 as i32, sev.sigev_signo);
+        assert_eq!(99, sev.sigev_value.sival_ptr as i64);
+    }
+
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn ok() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let mut rbuf0 = vec![0; 4];
+        let mut rbuf1 = vec![0; 2];
+        let mut rbufs =
+            [IoSliceMut::new(&mut rbuf0), IoSliceMut::new(&mut rbuf1)];
+        const EXPECT0: &[u8] = b"cdef";
+        const EXPECT1: &[u8] = b"12";
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        {
+            let fd = f.as_raw_fd();
+            let mut aior = Box::pin(AioReadv::new(
+                fd,
+                2,
+                &mut rbufs,
+                0,
+                SigevNotify::SigevNone,
+            ));
+            aior.as_mut().submit().unwrap();
+
+            let err = poll_aio!(&mut aior);
+            assert_eq!(err, Ok(()));
+            assert_eq!(
+                aior.as_mut().aio_return().unwrap(),
+                EXPECT0.len() + EXPECT1.len()
+            );
+        }
+        assert_eq!(&EXPECT0, &rbuf0);
+        assert_eq!(&EXPECT1, &rbuf1);
+    }
+}
+
+mod aio_write {
+    use super::*;
+
+    #[test]
+    fn test_accessors() {
+        let wbuf = vec![0; 4];
+        let aiocb = AioWrite::new(
+            1001,
+            2, //offset
+            &wbuf,
+            42, //priority
+            SigevNotify::SigevSignal {
+                signal: Signal::SIGUSR2,
+                si_value: 99,
+            },
+        );
+        assert_eq!(1001, aiocb.fd());
+        assert_eq!(4, aiocb.nbytes());
+        assert_eq!(2, aiocb.offset());
+        assert_eq!(42, aiocb.priority());
+        let sev = aiocb.sigevent().sigevent();
+        assert_eq!(Signal::SIGUSR2 as i32, sev.sigev_signo);
+        assert_eq!(99, sev.sigev_value.sival_ptr as i64);
+    }
+
+    // Tests AioWrite.cancel.  We aren't trying to test the OS's implementation,
+    // only our bindings.  So it's sufficient to check that cancel
+    // returned any AioCancelStat value.
+    #[test]
+    #[cfg_attr(target_env = "musl", ignore)]
+    fn cancel() {
+        let wbuf: &[u8] = b"CDEF";
+
+        let f = tempfile().unwrap();
+        let mut aiow = Box::pin(AioWrite::new(
+            f.as_raw_fd(),
+            0,
+            wbuf,
+            0,
+            SigevNotify::SigevNone,
+        ));
+        aiow.as_mut().submit().unwrap();
+        let err = aiow.as_mut().error();
+        assert!(err == Ok(()) || err == Err(Errno::EINPROGRESS));
+
+        aiow.as_mut().cancel().unwrap();
+
+        // Wait for aiow to complete, but don't care whether it succeeded
+        let _ = poll_aio!(&mut aiow);
+        let _ = aiow.as_mut().aio_return();
+    }
+
+    // Test a simple aio operation with no completion notification.  We must
+    // poll for completion.
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn ok() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let wbuf = "CDEF".to_string().into_bytes();
+        let mut rbuf = Vec::new();
+        const EXPECT: &[u8] = b"abCDEF123456";
+
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        let mut aiow = Box::pin(AioWrite::new(
+            f.as_raw_fd(),
+            2,
+            &wbuf,
+            0,
+            SigevNotify::SigevNone,
+        ));
+        aiow.as_mut().submit().unwrap();
+
+        let err = poll_aio!(&mut aiow);
+        assert_eq!(err, Ok(()));
+        assert_eq!(aiow.as_mut().aio_return().unwrap(), wbuf.len());
+
+        f.rewind().unwrap();
+        let len = f.read_to_end(&mut rbuf).unwrap();
+        assert_eq!(len, EXPECT.len());
+        assert_eq!(rbuf, EXPECT);
+    }
+
+    // Like ok, but allocates the structure on the stack.
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn on_stack() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let wbuf = "CDEF".to_string().into_bytes();
+        let mut rbuf = Vec::new();
+        const EXPECT: &[u8] = b"abCDEF123456";
+
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        let mut aiow = AioWrite::new(
+            f.as_raw_fd(),
+            2, //offset
+            &wbuf,
+            0, //priority
+            SigevNotify::SigevNone,
+        );
+        let mut aiow = unsafe { Pin::new_unchecked(&mut aiow) };
+        aiow.as_mut().submit().unwrap();
+
+        let err = poll_aio!(&mut aiow);
+        assert_eq!(err, Ok(()));
+        assert_eq!(aiow.as_mut().aio_return().unwrap(), wbuf.len());
+
+        f.rewind().unwrap();
+        let len = f.read_to_end(&mut rbuf).unwrap();
+        assert_eq!(len, EXPECT.len());
+        assert_eq!(rbuf, EXPECT);
+    }
+
+    /// `AioWrite::write` should not modify the `AioCb` object if
+    /// `libc::aio_write` returns an error.
+    // Skip on Linux, because Linux's AIO implementation can't detect errors
+    // synchronously
+    #[test]
+    #[cfg(any(target_os = "freebsd", target_os = "macos"))]
+    fn error() {
+        let wbuf = "CDEF".to_string().into_bytes();
+        let mut aiow = Box::pin(AioWrite::new(
+            666, // An invalid file descriptor
+            0,   //offset
+            &wbuf,
+            0, //priority
+            SigevNotify::SigevNone,
+        ));
+        aiow.as_mut().submit().expect_err("assertion failed");
+        // Dropping the AioWrite at this point should not panic
+    }
+}
+
+#[cfg(target_os = "freebsd")]
+#[cfg(fbsd14)]
+mod aio_writev {
+    use std::io::IoSlice;
+
+    use super::*;
+
+    #[test]
+    fn test_accessors() {
+        let wbuf0 = vec![0; 4];
+        let wbuf1 = vec![0; 8];
+        let wbufs = [IoSlice::new(&wbuf0), IoSlice::new(&wbuf1)];
+        let aiocb = AioWritev::new(
+            1001,
+            2, //offset
+            &wbufs,
+            42, //priority
+            SigevNotify::SigevSignal {
+                signal: Signal::SIGUSR2,
+                si_value: 99,
+            },
+        );
+        assert_eq!(1001, aiocb.fd());
+        assert_eq!(2, aiocb.iovlen());
+        assert_eq!(2, aiocb.offset());
+        assert_eq!(42, aiocb.priority());
+        let sev = aiocb.sigevent().sigevent();
+        assert_eq!(Signal::SIGUSR2 as i32, sev.sigev_signo);
+        assert_eq!(99, sev.sigev_value.sival_ptr as i64);
+    }
+
+    // Test a simple aio operation with no completion notification.  We must
+    // poll for completion.
+    #[test]
+    #[cfg_attr(all(target_env = "musl", target_arch = "x86_64"), ignore)]
+    fn ok() {
+        const INITIAL: &[u8] = b"abcdef123456";
+        let wbuf0 = b"BC";
+        let wbuf1 = b"DEF";
+        let wbufs = [IoSlice::new(wbuf0), IoSlice::new(wbuf1)];
+        let wlen = wbuf0.len() + wbuf1.len();
+        let mut rbuf = Vec::new();
+        const EXPECT: &[u8] = b"aBCDEF123456";
+
+        let mut f = tempfile().unwrap();
+        f.write_all(INITIAL).unwrap();
+        let mut aiow = Box::pin(AioWritev::new(
+            f.as_raw_fd(),
+            1,
+            &wbufs,
+            0,
+            SigevNotify::SigevNone,
+        ));
+        aiow.as_mut().submit().unwrap();
+
+        let err = poll_aio!(&mut aiow);
+        assert_eq!(err, Ok(()));
+        assert_eq!(aiow.as_mut().aio_return().unwrap(), wlen);
+
+        f.rewind().unwrap();
+        let len = f.read_to_end(&mut rbuf).unwrap();
+        assert_eq!(len, EXPECT.len());
+        assert_eq!(rbuf, EXPECT);
+    }
+}
+
+// Test an aio operation with completion delivered by a signal
+#[test]
+#[cfg_attr(
+    any(
+        all(target_env = "musl", target_arch = "x86_64"),
+        target_arch = "mips",
+        target_arch = "mips64"
+    ),
+    ignore
+)]
+fn sigev_signal() {
+    let _m = crate::SIGNAL_MTX.lock();
+    let sa = SigAction::new(
+        SigHandler::Handler(sigfunc),
+        SaFlags::SA_RESETHAND,
+        SigSet::empty(),
+    );
+    SIGNALED.store(false, Ordering::Relaxed);
+    unsafe { sigaction(Signal::SIGUSR2, &sa) }.unwrap();
+
+    const INITIAL: &[u8] = b"abcdef123456";
+    const WBUF: &[u8] = b"CDEF";
+    let mut rbuf = Vec::new();
+    const EXPECT: &[u8] = b"abCDEF123456";
+
+    let mut f = tempfile().unwrap();
+    f.write_all(INITIAL).unwrap();
+    let mut aiow = Box::pin(AioWrite::new(
+        f.as_raw_fd(),
+        2, //offset
+        WBUF,
+        0, //priority
+        SigevNotify::SigevSignal {
+            signal: Signal::SIGUSR2,
+            si_value: 0, //TODO: validate in sigfunc
+        },
+    ));
+    aiow.as_mut().submit().unwrap();
+    while !SIGNALED.load(Ordering::Relaxed) {
+        thread::sleep(time::Duration::from_millis(10));
+    }
+
+    assert_eq!(aiow.as_mut().aio_return().unwrap(), WBUF.len());
+    f.rewind().unwrap();
+    let len = f.read_to_end(&mut rbuf).unwrap();
+    assert_eq!(len, EXPECT.len());
+    assert_eq!(rbuf, EXPECT);
+}
+
+// Tests using aio_cancel_all for all outstanding IOs.
+#[test]
+#[cfg_attr(target_env = "musl", ignore)]
+fn test_aio_cancel_all() {
+    let wbuf: &[u8] = b"CDEF";
+
+    let f = tempfile().unwrap();
+    let mut aiocb = Box::pin(AioWrite::new(
+        f.as_raw_fd(),
+        0, //offset
+        wbuf,
+        0, //priority
+        SigevNotify::SigevNone,
+    ));
+    aiocb.as_mut().submit().unwrap();
+    let err = aiocb.as_mut().error();
+    assert!(err == Ok(()) || err == Err(Errno::EINPROGRESS));
+
+    aio_cancel_all(f.as_raw_fd()).unwrap();
+
+    // Wait for aiocb to complete, but don't care whether it succeeded
+    let _ = poll_aio!(&mut aiocb);
+    let _ = aiocb.as_mut().aio_return();
+}
+
+#[test]
+// On Cirrus on Linux, this test fails due to a glibc bug.
+// https://github.com/nix-rust/nix/issues/1099
+#[cfg_attr(target_os = "linux", ignore)]
+// On Cirrus, aio_suspend is failing with EINVAL
+// https://github.com/nix-rust/nix/issues/1361
+#[cfg_attr(target_os = "macos", ignore)]
+fn test_aio_suspend() {
+    const INITIAL: &[u8] = b"abcdef123456";
+    const WBUF: &[u8] = b"CDEFG";
+    let timeout = TimeSpec::seconds(10);
+    let mut rbuf = vec![0; 4];
+    let rlen = rbuf.len();
+    let mut f = tempfile().unwrap();
+    f.write_all(INITIAL).unwrap();
+
+    let mut wcb = Box::pin(AioWrite::new(
+        f.as_raw_fd(),
+        2, //offset
+        WBUF,
+        0, //priority
+        SigevNotify::SigevNone,
+    ));
+
+    let mut rcb = Box::pin(AioRead::new(
+        f.as_raw_fd(),
+        8, //offset
+        &mut rbuf,
+        0, //priority
+        SigevNotify::SigevNone,
+    ));
+    wcb.as_mut().submit().unwrap();
+    rcb.as_mut().submit().unwrap();
+    loop {
+        {
+            let cbbuf = [
+                &*wcb as &dyn AsRef<libc::aiocb>,
+                &*rcb as &dyn AsRef<libc::aiocb>,
+            ];
+            let r = aio_suspend(&cbbuf[..], Some(timeout));
+            match r {
+                Err(Errno::EINTR) => continue,
+                Err(e) => panic!("aio_suspend returned {e:?}"),
+                Ok(_) => (),
+            };
+        }
+        if rcb.as_mut().error() != Err(Errno::EINPROGRESS)
+            && wcb.as_mut().error() != Err(Errno::EINPROGRESS)
+        {
+            break;
+        }
+    }
+
+    assert_eq!(wcb.as_mut().aio_return().unwrap(), WBUF.len());
+    assert_eq!(rcb.as_mut().aio_return().unwrap(), rlen);
+}
diff --git a/vendor/nix/test/sys/test_aio_drop.rs b/vendor/nix/test/sys/test_aio_drop.rs
new file mode 100644
index 000000000..bbe6623fd
--- /dev/null
+++ b/vendor/nix/test/sys/test_aio_drop.rs
@@ -0,0 +1,35 @@
+// Test dropping an AioCb that hasn't yet finished.
+// This must happen in its own process, because on OSX this test seems to hose
+// the AIO subsystem and causes subsequent tests to fail
+#[test]
+#[should_panic(expected = "Dropped an in-progress AioCb")]
+#[cfg(all(
+    not(target_env = "musl"),
+    not(target_env = "uclibc"),
+    any(
+        target_os = "linux",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "freebsd",
+        target_os = "netbsd"
+    )
+))]
+fn test_drop() {
+    use nix::sys::aio::*;
+    use nix::sys::signal::*;
+    use std::os::unix::io::AsRawFd;
+    use tempfile::tempfile;
+
+    const WBUF: &[u8] = b"CDEF";
+
+    let f = tempfile().unwrap();
+    f.set_len(6).unwrap();
+    let mut aiocb = Box::pin(AioWrite::new(
+        f.as_raw_fd(),
+        2, //offset
+        WBUF,
+        0, //priority
+        SigevNotify::SigevNone,
+    ));
+    aiocb.as_mut().submit().unwrap();
+}
diff --git a/vendor/nix/test/sys/test_epoll.rs b/vendor/nix/test/sys/test_epoll.rs
new file mode 100644
index 000000000..84b100c1e
--- /dev/null
+++ b/vendor/nix/test/sys/test_epoll.rs
@@ -0,0 +1,26 @@
+#![allow(deprecated)]
+
+use nix::errno::Errno;
+use nix::sys::epoll::{epoll_create1, epoll_ctl};
+use nix::sys::epoll::{EpollCreateFlags, EpollEvent, EpollFlags, EpollOp};
+
+#[test]
+pub fn test_epoll_errno() {
+    let efd = epoll_create1(EpollCreateFlags::empty()).unwrap();
+    let result = epoll_ctl(efd, EpollOp::EpollCtlDel, 1, None);
+    result.expect_err("assertion failed");
+    assert_eq!(result.unwrap_err(), Errno::ENOENT);
+
+    let result = epoll_ctl(efd, EpollOp::EpollCtlAdd, 1, None);
+    result.expect_err("assertion failed");
+    assert_eq!(result.unwrap_err(), Errno::EINVAL);
+}
+
+#[test]
+pub fn test_epoll_ctl() {
+    let efd = epoll_create1(EpollCreateFlags::empty()).unwrap();
+    let mut event =
+        EpollEvent::new(EpollFlags::EPOLLIN | EpollFlags::EPOLLERR, 1);
+    epoll_ctl(efd, EpollOp::EpollCtlAdd, 1, &mut event).unwrap();
+    epoll_ctl(efd, EpollOp::EpollCtlDel, 1, None).unwrap();
+}
diff --git a/vendor/nix/test/sys/test_inotify.rs b/vendor/nix/test/sys/test_inotify.rs
new file mode 100644
index 000000000..bb5851a90
--- /dev/null
+++ b/vendor/nix/test/sys/test_inotify.rs
@@ -0,0 +1,65 @@
+use nix::errno::Errno;
+use nix::sys::inotify::{AddWatchFlags, InitFlags, Inotify};
+use std::ffi::OsString;
+use std::fs::{rename, File};
+
+#[test]
+pub fn test_inotify() {
+    let instance = Inotify::init(InitFlags::IN_NONBLOCK).unwrap();
+    let tempdir = tempfile::tempdir().unwrap();
+
+    instance
+        .add_watch(tempdir.path(), AddWatchFlags::IN_ALL_EVENTS)
+        .unwrap();
+
+    let events = instance.read_events();
+    assert_eq!(events.unwrap_err(), Errno::EAGAIN);
+
+    File::create(tempdir.path().join("test")).unwrap();
+
+    let events = instance.read_events().unwrap();
+    assert_eq!(events[0].name, Some(OsString::from("test")));
+}
+
+#[test]
+pub fn test_inotify_multi_events() {
+    let instance = Inotify::init(InitFlags::IN_NONBLOCK).unwrap();
+    let tempdir = tempfile::tempdir().unwrap();
+
+    instance
+        .add_watch(tempdir.path(), AddWatchFlags::IN_ALL_EVENTS)
+        .unwrap();
+
+    let events = instance.read_events();
+    assert_eq!(events.unwrap_err(), Errno::EAGAIN);
+
+    File::create(tempdir.path().join("test")).unwrap();
+    rename(tempdir.path().join("test"), tempdir.path().join("test2")).unwrap();
+
+    // Now there should be 5 events in queue:
+    //   - IN_CREATE on test
+    //   - IN_OPEN on test
+    //   - IN_CLOSE_WRITE on test
+    //   - IN_MOVED_FROM on test with a cookie
+    //   - IN_MOVED_TO on test2 with the same cookie
+
+    let events = instance.read_events().unwrap();
+    assert_eq!(events.len(), 5);
+
+    assert_eq!(events[0].mask, AddWatchFlags::IN_CREATE);
+    assert_eq!(events[0].name, Some(OsString::from("test")));
+
+    assert_eq!(events[1].mask, AddWatchFlags::IN_OPEN);
+    assert_eq!(events[1].name, Some(OsString::from("test")));
+
+    assert_eq!(events[2].mask, AddWatchFlags::IN_CLOSE_WRITE);
+    assert_eq!(events[2].name, Some(OsString::from("test")));
+
+    assert_eq!(events[3].mask, AddWatchFlags::IN_MOVED_FROM);
+    assert_eq!(events[3].name, Some(OsString::from("test")));
+
+    assert_eq!(events[4].mask, AddWatchFlags::IN_MOVED_TO);
+    assert_eq!(events[4].name, Some(OsString::from("test2")));
+
+    assert_eq!(events[3].cookie, events[4].cookie);
+}
diff --git a/vendor/nix/test/sys/test_ioctl.rs b/vendor/nix/test/sys/test_ioctl.rs
new file mode 100644
index 000000000..40f60cfdb
--- /dev/null
+++ b/vendor/nix/test/sys/test_ioctl.rs
@@ -0,0 +1,376 @@
+#![allow(dead_code)]
+
+// Simple tests to ensure macro generated fns compile
+ioctl_none_bad!(do_bad, 0x1234);
+ioctl_read_bad!(do_bad_read, 0x1234, u16);
+ioctl_write_int_bad!(do_bad_write_int, 0x1234);
+ioctl_write_ptr_bad!(do_bad_write_ptr, 0x1234, u8);
+ioctl_readwrite_bad!(do_bad_readwrite, 0x1234, u32);
+ioctl_none!(do_none, 0, 0);
+ioctl_read!(read_test, 0, 0, u32);
+ioctl_write_int!(write_ptr_int, 0, 0);
+ioctl_write_ptr!(write_ptr_u8, 0, 0, u8);
+ioctl_write_ptr!(write_ptr_u32, 0, 0, u32);
+ioctl_write_ptr!(write_ptr_u64, 0, 0, u64);
+ioctl_readwrite!(readwrite_test, 0, 0, u64);
+ioctl_read_buf!(readbuf_test, 0, 0, u32);
+const SPI_IOC_MAGIC: u8 = b'k';
+const SPI_IOC_MESSAGE: u8 = 0;
+ioctl_write_buf!(writebuf_test_consts, SPI_IOC_MAGIC, SPI_IOC_MESSAGE, u8);
+ioctl_write_buf!(writebuf_test_u8, 0, 0, u8);
+ioctl_write_buf!(writebuf_test_u32, 0, 0, u32);
+ioctl_write_buf!(writebuf_test_u64, 0, 0, u64);
+ioctl_readwrite_buf!(readwritebuf_test, 0, 0, u32);
+
+// See C code for source of values for op calculations (does NOT work for mips/powerpc):
+// https://gist.github.com/posborne/83ea6880770a1aef332e
+//
+// TODO:  Need a way to compute these constants at test time.  Using precomputed
+// values is fragile and needs to be maintained.
+
+#[cfg(any(target_os = "linux", target_os = "android"))]
+mod linux {
+    // The cast is not unnecessary on all platforms.
+    #[allow(clippy::unnecessary_cast)]
+    #[test]
+    fn test_op_none() {
+        if cfg!(any(
+            target_arch = "mips",
+            target_arch = "mips64",
+            target_arch = "powerpc",
+            target_arch = "powerpc64"
+        )) {
+            assert_eq!(request_code_none!(b'q', 10) as u32, 0x2000_710A);
+            assert_eq!(request_code_none!(b'a', 255) as u32, 0x2000_61FF);
+        } else {
+            assert_eq!(request_code_none!(b'q', 10) as u32, 0x0000_710A);
+            assert_eq!(request_code_none!(b'a', 255) as u32, 0x0000_61FF);
+        }
+    }
+
+    // The cast is not unnecessary on all platforms.
+    #[allow(clippy::unnecessary_cast)]
+    #[test]
+    fn test_op_write() {
+        if cfg!(any(
+            target_arch = "mips",
+            target_arch = "mips64",
+            target_arch = "powerpc",
+            target_arch = "powerpc64"
+        )) {
+            assert_eq!(request_code_write!(b'z', 10, 1) as u32, 0x8001_7A0A);
+            assert_eq!(request_code_write!(b'z', 10, 512) as u32, 0x8200_7A0A);
+        } else {
+            assert_eq!(request_code_write!(b'z', 10, 1) as u32, 0x4001_7A0A);
+            assert_eq!(request_code_write!(b'z', 10, 512) as u32, 0x4200_7A0A);
+        }
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn test_op_write_64() {
+        if cfg!(any(target_arch = "mips64", target_arch = "powerpc64")) {
+            assert_eq!(
+                request_code_write!(b'z', 10, 1u64 << 32) as u32,
+                0x8000_7A0A
+            );
+        } else {
+            assert_eq!(
+                request_code_write!(b'z', 10, 1u64 << 32) as u32,
+                0x4000_7A0A
+            );
+        }
+    }
+
+    // The cast is not unnecessary on all platforms.
+    #[allow(clippy::unnecessary_cast)]
+    #[test]
+    fn test_op_read() {
+        if cfg!(any(
+            target_arch = "mips",
+            target_arch = "mips64",
+            target_arch = "powerpc",
+            target_arch = "powerpc64"
+        )) {
+            assert_eq!(request_code_read!(b'z', 10, 1) as u32, 0x4001_7A0A);
+            assert_eq!(request_code_read!(b'z', 10, 512) as u32, 0x4200_7A0A);
+        } else {
+            assert_eq!(request_code_read!(b'z', 10, 1) as u32, 0x8001_7A0A);
+            assert_eq!(request_code_read!(b'z', 10, 512) as u32, 0x8200_7A0A);
+        }
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn test_op_read_64() {
+        if cfg!(any(target_arch = "mips64", target_arch = "powerpc64")) {
+            assert_eq!(
+                request_code_read!(b'z', 10, 1u64 << 32) as u32,
+                0x4000_7A0A
+            );
+        } else {
+            assert_eq!(
+                request_code_read!(b'z', 10, 1u64 << 32) as u32,
+                0x8000_7A0A
+            );
+        }
+    }
+
+    // The cast is not unnecessary on all platforms.
+    #[allow(clippy::unnecessary_cast)]
+    #[test]
+    fn test_op_read_write() {
+        assert_eq!(request_code_readwrite!(b'z', 10, 1) as u32, 0xC001_7A0A);
+        assert_eq!(request_code_readwrite!(b'z', 10, 512) as u32, 0xC200_7A0A);
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn test_op_read_write_64() {
+        assert_eq!(
+            request_code_readwrite!(b'z', 10, 1u64 << 32) as u32,
+            0xC000_7A0A
+        );
+    }
+}
+
+#[cfg(any(
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "openbsd"
+))]
+mod bsd {
+    #[test]
+    fn test_op_none() {
+        assert_eq!(request_code_none!(b'q', 10), 0x2000_710A);
+        assert_eq!(request_code_none!(b'a', 255), 0x2000_61FF);
+    }
+
+    #[cfg(any(target_os = "dragonfly", target_os = "freebsd"))]
+    #[test]
+    fn test_op_write_int() {
+        assert_eq!(request_code_write_int!(b'v', 4), 0x2004_7604);
+        assert_eq!(request_code_write_int!(b'p', 2), 0x2004_7002);
+    }
+
+    #[test]
+    fn test_op_write() {
+        assert_eq!(request_code_write!(b'z', 10, 1), 0x8001_7A0A);
+        assert_eq!(request_code_write!(b'z', 10, 512), 0x8200_7A0A);
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn test_op_write_64() {
+        assert_eq!(request_code_write!(b'z', 10, 1u64 << 32), 0x8000_7A0A);
+    }
+
+    #[test]
+    fn test_op_read() {
+        assert_eq!(request_code_read!(b'z', 10, 1), 0x4001_7A0A);
+        assert_eq!(request_code_read!(b'z', 10, 512), 0x4200_7A0A);
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn test_op_read_64() {
+        assert_eq!(request_code_read!(b'z', 10, 1u64 << 32), 0x4000_7A0A);
+    }
+
+    #[test]
+    fn test_op_read_write() {
+        assert_eq!(request_code_readwrite!(b'z', 10, 1), 0xC001_7A0A);
+        assert_eq!(request_code_readwrite!(b'z', 10, 512), 0xC200_7A0A);
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn test_op_read_write_64() {
+        assert_eq!(request_code_readwrite!(b'z', 10, 1u64 << 32), 0xC000_7A0A);
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+mod linux_ioctls {
+    use std::mem;
+    use std::os::unix::io::AsRawFd;
+
+    use libc::{termios, TCGETS, TCSBRK, TCSETS, TIOCNXCL};
+    use tempfile::tempfile;
+
+    use nix::errno::Errno;
+
+    ioctl_none_bad!(tiocnxcl, TIOCNXCL);
+    #[test]
+    fn test_ioctl_none_bad() {
+        let file = tempfile().unwrap();
+        let res = unsafe { tiocnxcl(file.as_raw_fd()) };
+        assert_eq!(res, Err(Errno::ENOTTY));
+    }
+
+    ioctl_read_bad!(tcgets, TCGETS, termios);
+    #[test]
+    fn test_ioctl_read_bad() {
+        let file = tempfile().unwrap();
+        let mut termios = unsafe { mem::zeroed() };
+        let res = unsafe { tcgets(file.as_raw_fd(), &mut termios) };
+        assert_eq!(res, Err(Errno::ENOTTY));
+    }
+
+    ioctl_write_int_bad!(tcsbrk, TCSBRK);
+    #[test]
+    fn test_ioctl_write_int_bad() {
+        let file = tempfile().unwrap();
+        let res = unsafe { tcsbrk(file.as_raw_fd(), 0) };
+        assert_eq!(res, Err(Errno::ENOTTY));
+    }
+
+    ioctl_write_ptr_bad!(tcsets, TCSETS, termios);
+    #[test]
+    fn test_ioctl_write_ptr_bad() {
+        let file = tempfile().unwrap();
+        let termios: termios = unsafe { mem::zeroed() };
+        let res = unsafe { tcsets(file.as_raw_fd(), &termios) };
+        assert_eq!(res, Err(Errno::ENOTTY));
+    }
+
+    // FIXME: Find a suitable example for `ioctl_readwrite_bad`
+
+    // From linux/videodev2.h
+    ioctl_none!(log_status, b'V', 70);
+    #[test]
+    fn test_ioctl_none() {
+        let file = tempfile().unwrap();
+        let res = unsafe { log_status(file.as_raw_fd()) };
+        assert!(res == Err(Errno::ENOTTY) || res == Err(Errno::ENOSYS));
+    }
+
+    #[repr(C)]
+    pub struct v4l2_audio {
+        index: u32,
+        name: [u8; 32],
+        capability: u32,
+        mode: u32,
+        reserved: [u32; 2],
+    }
+
+    // From linux/videodev2.h
+    ioctl_write_ptr!(s_audio, b'V', 34, v4l2_audio);
+    #[test]
+    fn test_ioctl_write_ptr() {
+        let file = tempfile().unwrap();
+        let data: v4l2_audio = unsafe { mem::zeroed() };
+        let res = unsafe { s_audio(file.as_raw_fd(), &data) };
+        assert!(res == Err(Errno::ENOTTY) || res == Err(Errno::ENOSYS));
+    }
+
+    // From linux/net/bluetooth/hci_sock.h
+    const HCI_IOC_MAGIC: u8 = b'H';
+    const HCI_IOC_HCIDEVUP: u8 = 201;
+    ioctl_write_int!(hcidevup, HCI_IOC_MAGIC, HCI_IOC_HCIDEVUP);
+    #[test]
+    fn test_ioctl_write_int() {
+        let file = tempfile().unwrap();
+        let res = unsafe { hcidevup(file.as_raw_fd(), 0) };
+        assert!(res == Err(Errno::ENOTTY) || res == Err(Errno::ENOSYS));
+    }
+
+    // From linux/videodev2.h
+    ioctl_read!(g_audio, b'V', 33, v4l2_audio);
+    #[test]
+    fn test_ioctl_read() {
+        let file = tempfile().unwrap();
+        let mut data: v4l2_audio = unsafe { mem::zeroed() };
+        let res = unsafe { g_audio(file.as_raw_fd(), &mut data) };
+        assert!(res == Err(Errno::ENOTTY) || res == Err(Errno::ENOSYS));
+    }
+
+    // From linux/videodev2.h
+    ioctl_readwrite!(enum_audio, b'V', 65, v4l2_audio);
+    #[test]
+    fn test_ioctl_readwrite() {
+        let file = tempfile().unwrap();
+        let mut data: v4l2_audio = unsafe { mem::zeroed() };
+        let res = unsafe { enum_audio(file.as_raw_fd(), &mut data) };
+        assert!(res == Err(Errno::ENOTTY) || res == Err(Errno::ENOSYS));
+    }
+
+    // FIXME: Find a suitable example for `ioctl_read_buf`.
+
+    #[repr(C)]
+    pub struct spi_ioc_transfer {
+        tx_buf: u64,
+        rx_buf: u64,
+        len: u32,
+        speed_hz: u32,
+        delay_usecs: u16,
+        bits_per_word: u8,
+        cs_change: u8,
+        tx_nbits: u8,
+        rx_nbits: u8,
+        pad: u16,
+    }
+
+    // From linux/spi/spidev.h
+    ioctl_write_buf!(
+        spi_ioc_message,
+        super::SPI_IOC_MAGIC,
+        super::SPI_IOC_MESSAGE,
+        spi_ioc_transfer
+    );
+    #[test]
+    fn test_ioctl_write_buf() {
+        let file = tempfile().unwrap();
+        let data: [spi_ioc_transfer; 4] = unsafe { mem::zeroed() };
+        let res = unsafe { spi_ioc_message(file.as_raw_fd(), &data[..]) };
+        assert!(res == Err(Errno::ENOTTY) || res == Err(Errno::ENOSYS));
+    }
+
+    // FIXME: Find a suitable example for `ioctl_readwrite_buf`.
+}
+
+#[cfg(target_os = "freebsd")]
+mod freebsd_ioctls {
+    use std::mem;
+    use std::os::unix::io::AsRawFd;
+
+    use libc::termios;
+    use tempfile::tempfile;
+
+    use nix::errno::Errno;
+
+    // From sys/sys/ttycom.h
+    const TTY_IOC_MAGIC: u8 = b't';
+    const TTY_IOC_TYPE_NXCL: u8 = 14;
+    const TTY_IOC_TYPE_GETA: u8 = 19;
+    const TTY_IOC_TYPE_SETA: u8 = 20;
+
+    ioctl_none!(tiocnxcl, TTY_IOC_MAGIC, TTY_IOC_TYPE_NXCL);
+    #[test]
+    fn test_ioctl_none() {
+        let file = tempfile().unwrap();
+        let res = unsafe { tiocnxcl(file.as_raw_fd()) };
+        assert_eq!(res, Err(Errno::ENOTTY));
+    }
+
+    ioctl_read!(tiocgeta, TTY_IOC_MAGIC, TTY_IOC_TYPE_GETA, termios);
+    #[test]
+    fn test_ioctl_read() {
+        let file = tempfile().unwrap();
+        let mut termios = unsafe { mem::zeroed() };
+        let res = unsafe { tiocgeta(file.as_raw_fd(), &mut termios) };
+        assert_eq!(res, Err(Errno::ENOTTY));
+    }
+
+    ioctl_write_ptr!(tiocseta, TTY_IOC_MAGIC, TTY_IOC_TYPE_SETA, termios);
+    #[test]
+    fn test_ioctl_write_ptr() {
+        let file = tempfile().unwrap();
+        let termios: termios = unsafe { mem::zeroed() };
+        let res = unsafe { tiocseta(file.as_raw_fd(), &termios) };
+        assert_eq!(res, Err(Errno::ENOTTY));
+    }
+}
diff --git a/vendor/nix/test/sys/test_mman.rs b/vendor/nix/test/sys/test_mman.rs
new file mode 100644
index 000000000..b4674e53f
--- /dev/null
+++ b/vendor/nix/test/sys/test_mman.rs
@@ -0,0 +1,122 @@
+use nix::sys::mman::{mmap, MapFlags, ProtFlags};
+use std::{num::NonZeroUsize, os::unix::io::BorrowedFd};
+
+#[test]
+fn test_mmap_anonymous() {
+    unsafe {
+        let ptr = mmap::<BorrowedFd>(
+            None,
+            NonZeroUsize::new(1).unwrap(),
+            ProtFlags::PROT_READ | ProtFlags::PROT_WRITE,
+            MapFlags::MAP_PRIVATE | MapFlags::MAP_ANONYMOUS,
+            None,
+            0,
+        )
+        .unwrap() as *mut u8;
+        assert_eq!(*ptr, 0x00u8);
+        *ptr = 0xffu8;
+        assert_eq!(*ptr, 0xffu8);
+    }
+}
+
+#[test]
+#[cfg(any(target_os = "linux", target_os = "netbsd"))]
+fn test_mremap_grow() {
+    use nix::libc::{c_void, size_t};
+    use nix::sys::mman::{mremap, MRemapFlags};
+
+    const ONE_K: size_t = 1024;
+    let one_k_non_zero = NonZeroUsize::new(ONE_K).unwrap();
+
+    let slice: &mut [u8] = unsafe {
+        let mem = mmap::<BorrowedFd>(
+            None,
+            one_k_non_zero,
+            ProtFlags::PROT_READ | ProtFlags::PROT_WRITE,
+            MapFlags::MAP_ANONYMOUS | MapFlags::MAP_PRIVATE,
+            None,
+            0,
+        )
+        .unwrap();
+        std::slice::from_raw_parts_mut(mem as *mut u8, ONE_K)
+    };
+    assert_eq!(slice[ONE_K - 1], 0x00);
+    slice[ONE_K - 1] = 0xFF;
+    assert_eq!(slice[ONE_K - 1], 0xFF);
+
+    let slice: &mut [u8] = unsafe {
+        #[cfg(target_os = "linux")]
+        let mem = mremap(
+            slice.as_mut_ptr() as *mut c_void,
+            ONE_K,
+            10 * ONE_K,
+            MRemapFlags::MREMAP_MAYMOVE,
+            None,
+        )
+        .unwrap();
+        #[cfg(target_os = "netbsd")]
+        let mem = mremap(
+            slice.as_mut_ptr() as *mut c_void,
+            ONE_K,
+            10 * ONE_K,
+            MRemapFlags::MAP_REMAPDUP,
+            None,
+        )
+        .unwrap();
+        std::slice::from_raw_parts_mut(mem as *mut u8, 10 * ONE_K)
+    };
+
+    // The first KB should still have the old data in it.
+    assert_eq!(slice[ONE_K - 1], 0xFF);
+
+    // The additional range should be zero-init'd and accessible.
+    assert_eq!(slice[10 * ONE_K - 1], 0x00);
+    slice[10 * ONE_K - 1] = 0xFF;
+    assert_eq!(slice[10 * ONE_K - 1], 0xFF);
+}
+
+#[test]
+#[cfg(any(target_os = "linux", target_os = "netbsd"))]
+// Segfaults for unknown reasons under QEMU for 32-bit targets
+#[cfg_attr(all(target_pointer_width = "32", qemu), ignore)]
+fn test_mremap_shrink() {
+    use nix::libc::{c_void, size_t};
+    use nix::sys::mman::{mremap, MRemapFlags};
+    use std::num::NonZeroUsize;
+
+    const ONE_K: size_t = 1024;
+    let ten_one_k = NonZeroUsize::new(10 * ONE_K).unwrap();
+    let slice: &mut [u8] = unsafe {
+        let mem = mmap::<BorrowedFd>(
+            None,
+            ten_one_k,
+            ProtFlags::PROT_READ | ProtFlags::PROT_WRITE,
+            MapFlags::MAP_ANONYMOUS | MapFlags::MAP_PRIVATE,
+            None,
+            0,
+        )
+        .unwrap();
+        std::slice::from_raw_parts_mut(mem as *mut u8, ONE_K)
+    };
+    assert_eq!(slice[ONE_K - 1], 0x00);
+    slice[ONE_K - 1] = 0xFF;
+    assert_eq!(slice[ONE_K - 1], 0xFF);
+
+    let slice: &mut [u8] = unsafe {
+        let mem = mremap(
+            slice.as_mut_ptr() as *mut c_void,
+            ten_one_k.into(),
+            ONE_K,
+            MRemapFlags::empty(),
+            None,
+        )
+        .unwrap();
+        // Since we didn't supply MREMAP_MAYMOVE, the address should be the
+        // same.
+        assert_eq!(mem, slice.as_mut_ptr() as *mut c_void);
+        std::slice::from_raw_parts_mut(mem as *mut u8, ONE_K)
+    };
+
+    // The first KB should still be accessible and have the old data in it.
+    assert_eq!(slice[ONE_K - 1], 0xFF);
+}
diff --git a/vendor/nix/test/sys/test_prctl.rs b/vendor/nix/test/sys/test_prctl.rs
new file mode 100644
index 000000000..351213b7e
--- /dev/null
+++ b/vendor/nix/test/sys/test_prctl.rs
@@ -0,0 +1,125 @@
+#[cfg(target_os = "linux")]
+#[cfg(feature = "process")]
+mod test_prctl {
+    use std::ffi::CStr;
+
+    use nix::sys::prctl;
+
+    #[cfg_attr(qemu, ignore)]
+    #[test]
+    fn test_get_set_subreaper() {
+        let original = prctl::get_child_subreaper().unwrap();
+
+        prctl::set_child_subreaper(true).unwrap();
+        let subreaper = prctl::get_child_subreaper().unwrap();
+        assert!(subreaper);
+
+        prctl::set_child_subreaper(original).unwrap();
+    }
+
+    #[test]
+    fn test_get_set_dumpable() {
+        let original = prctl::get_dumpable().unwrap();
+
+        prctl::set_dumpable(false).unwrap();
+        let dumpable = prctl::get_dumpable().unwrap();
+        assert!(!dumpable);
+
+        prctl::set_dumpable(original).unwrap();
+    }
+
+    #[test]
+    fn test_get_set_keepcaps() {
+        let original = prctl::get_keepcaps().unwrap();
+
+        prctl::set_keepcaps(true).unwrap();
+        let keepcaps = prctl::get_keepcaps().unwrap();
+        assert!(keepcaps);
+
+        prctl::set_keepcaps(original).unwrap();
+    }
+
+    #[test]
+    fn test_get_set_clear_mce_kill() {
+        use prctl::PrctlMCEKillPolicy::*;
+
+        prctl::set_mce_kill(PR_MCE_KILL_LATE).unwrap();
+        let mce = prctl::get_mce_kill().unwrap();
+        assert_eq!(mce, PR_MCE_KILL_LATE);
+
+        prctl::clear_mce_kill().unwrap();
+        let mce = prctl::get_mce_kill().unwrap();
+        assert_eq!(mce, PR_MCE_KILL_DEFAULT);
+    }
+
+    #[cfg_attr(qemu, ignore)]
+    #[test]
+    fn test_get_set_pdeathsig() {
+        use nix::sys::signal::Signal;
+
+        let original = prctl::get_pdeathsig().unwrap();
+
+        prctl::set_pdeathsig(Signal::SIGUSR1).unwrap();
+        let sig = prctl::get_pdeathsig().unwrap();
+        assert_eq!(sig, Some(Signal::SIGUSR1));
+
+        prctl::set_pdeathsig(original).unwrap();
+    }
+
+    #[test]
+    fn test_get_set_name() {
+        let original = prctl::get_name().unwrap();
+
+        let long_name =
+            CStr::from_bytes_with_nul(b"0123456789abcdefghijklmn\0").unwrap();
+        prctl::set_name(long_name).unwrap();
+        let res = prctl::get_name().unwrap();
+
+        // name truncated by kernel to TASK_COMM_LEN
+        assert_eq!(&long_name.to_str().unwrap()[..15], res.to_str().unwrap());
+
+        let short_name = CStr::from_bytes_with_nul(b"01234567\0").unwrap();
+        prctl::set_name(short_name).unwrap();
+        let res = prctl::get_name().unwrap();
+        assert_eq!(short_name.to_str().unwrap(), res.to_str().unwrap());
+
+        prctl::set_name(&original).unwrap();
+    }
+
+    #[cfg_attr(qemu, ignore)]
+    #[test]
+    fn test_get_set_timerslack() {
+        let original = prctl::get_timerslack().unwrap();
+
+        let slack = 60_000;
+        prctl::set_timerslack(slack).unwrap();
+        let res = prctl::get_timerslack().unwrap();
+        assert_eq!(slack, res as u64);
+
+        prctl::set_timerslack(original as u64).unwrap();
+    }
+
+    #[test]
+    fn test_disable_enable_perf_events() {
+        prctl::task_perf_events_disable().unwrap();
+        prctl::task_perf_events_enable().unwrap();
+    }
+
+    #[test]
+    fn test_get_set_no_new_privs() {
+        prctl::set_no_new_privs().unwrap();
+        let no_new_privs = prctl::get_no_new_privs().unwrap();
+        assert!(no_new_privs);
+    }
+
+    #[test]
+    fn test_get_set_thp_disable() {
+        let original = prctl::get_thp_disable().unwrap();
+
+        prctl::set_thp_disable(true).unwrap();
+        let thp_disable = prctl::get_thp_disable().unwrap();
+        assert!(thp_disable);
+
+        prctl::set_thp_disable(original).unwrap();
+    }
+}
diff --git a/vendor/nix/test/sys/test_pthread.rs b/vendor/nix/test/sys/test_pthread.rs
new file mode 100644
index 000000000..ce048bae6
--- /dev/null
+++ b/vendor/nix/test/sys/test_pthread.rs
@@ -0,0 +1,22 @@
+use nix::sys::pthread::*;
+
+#[cfg(any(target_env = "musl", target_os = "redox"))]
+#[test]
+fn test_pthread_self() {
+    let tid = pthread_self();
+    assert!(!tid.is_null());
+}
+
+#[cfg(not(any(target_env = "musl", target_os = "redox")))]
+#[test]
+fn test_pthread_self() {
+    let tid = pthread_self();
+    assert_ne!(tid, 0);
+}
+
+#[test]
+#[cfg(not(target_os = "redox"))]
+fn test_pthread_kill_none() {
+    pthread_kill(pthread_self(), None)
+        .expect("Should be able to send signal to my thread.");
+}
diff --git a/vendor/nix/test/sys/test_ptrace.rs b/vendor/nix/test/sys/test_ptrace.rs
new file mode 100644
index 000000000..530560fe1
--- /dev/null
+++ b/vendor/nix/test/sys/test_ptrace.rs
@@ -0,0 +1,275 @@
+#[cfg(all(
+    target_os = "linux",
+    any(target_arch = "x86_64", target_arch = "x86"),
+    target_env = "gnu"
+))]
+use memoffset::offset_of;
+use nix::errno::Errno;
+use nix::sys::ptrace;
+#[cfg(any(target_os = "android", target_os = "linux"))]
+use nix::sys::ptrace::Options;
+use nix::unistd::getpid;
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+use std::mem;
+
+use crate::*;
+
+#[test]
+fn test_ptrace() {
+    // Just make sure ptrace can be called at all, for now.
+    // FIXME: qemu-user doesn't implement ptrace on all arches, so permit ENOSYS
+    require_capability!("test_ptrace", CAP_SYS_PTRACE);
+    let err = ptrace::attach(getpid()).unwrap_err();
+    assert!(
+        err == Errno::EPERM || err == Errno::EINVAL || err == Errno::ENOSYS
+    );
+}
+
+// Just make sure ptrace_setoptions can be called at all, for now.
+#[test]
+#[cfg(any(target_os = "android", target_os = "linux"))]
+fn test_ptrace_setoptions() {
+    require_capability!("test_ptrace_setoptions", CAP_SYS_PTRACE);
+    let err = ptrace::setoptions(getpid(), Options::PTRACE_O_TRACESYSGOOD)
+        .unwrap_err();
+    assert_ne!(err, Errno::EOPNOTSUPP);
+}
+
+// Just make sure ptrace_getevent can be called at all, for now.
+#[test]
+#[cfg(any(target_os = "android", target_os = "linux"))]
+fn test_ptrace_getevent() {
+    require_capability!("test_ptrace_getevent", CAP_SYS_PTRACE);
+    let err = ptrace::getevent(getpid()).unwrap_err();
+    assert_ne!(err, Errno::EOPNOTSUPP);
+}
+
+// Just make sure ptrace_getsiginfo can be called at all, for now.
+#[test]
+#[cfg(any(target_os = "android", target_os = "linux"))]
+fn test_ptrace_getsiginfo() {
+    require_capability!("test_ptrace_getsiginfo", CAP_SYS_PTRACE);
+    if let Err(Errno::EOPNOTSUPP) = ptrace::getsiginfo(getpid()) {
+        panic!("ptrace_getsiginfo returns Errno::EOPNOTSUPP!");
+    }
+}
+
+// Just make sure ptrace_setsiginfo can be called at all, for now.
+#[test]
+#[cfg(any(target_os = "android", target_os = "linux"))]
+fn test_ptrace_setsiginfo() {
+    require_capability!("test_ptrace_setsiginfo", CAP_SYS_PTRACE);
+    let siginfo = unsafe { mem::zeroed() };
+    if let Err(Errno::EOPNOTSUPP) = ptrace::setsiginfo(getpid(), &siginfo) {
+        panic!("ptrace_setsiginfo returns Errno::EOPNOTSUPP!");
+    }
+}
+
+#[test]
+fn test_ptrace_cont() {
+    use nix::sys::ptrace;
+    use nix::sys::signal::{raise, Signal};
+    use nix::sys::wait::{waitpid, WaitPidFlag, WaitStatus};
+    use nix::unistd::fork;
+    use nix::unistd::ForkResult::*;
+
+    require_capability!("test_ptrace_cont", CAP_SYS_PTRACE);
+
+    let _m = crate::FORK_MTX.lock();
+
+    // FIXME: qemu-user doesn't implement ptrace on all architectures
+    // and returns ENOSYS in this case.
+    // We (ab)use this behavior to detect the affected platforms
+    // and skip the test then.
+    // On valid platforms the ptrace call should return Errno::EPERM, this
+    // is already tested by `test_ptrace`.
+    let err = ptrace::attach(getpid()).unwrap_err();
+    if err == Errno::ENOSYS {
+        return;
+    }
+
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Child => {
+            ptrace::traceme().unwrap();
+            // As recommended by ptrace(2), raise SIGTRAP to pause the child
+            // until the parent is ready to continue
+            loop {
+                raise(Signal::SIGTRAP).unwrap();
+            }
+        }
+        Parent { child } => {
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::Stopped(child, Signal::SIGTRAP))
+            );
+            ptrace::cont(child, None).unwrap();
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::Stopped(child, Signal::SIGTRAP))
+            );
+            ptrace::cont(child, Some(Signal::SIGKILL)).unwrap();
+            match waitpid(child, None) {
+                Ok(WaitStatus::Signaled(pid, Signal::SIGKILL, _))
+                    if pid == child =>
+                {
+                    // FIXME It's been observed on some systems (apple) the
+                    // tracee may not be killed but remain as a zombie process
+                    // affecting other wait based tests. Add an extra kill just
+                    // to make sure there are no zombies.
+                    let _ = waitpid(child, Some(WaitPidFlag::WNOHANG));
+                    while ptrace::cont(child, Some(Signal::SIGKILL)).is_ok() {
+                        let _ = waitpid(child, Some(WaitPidFlag::WNOHANG));
+                    }
+                }
+                _ => panic!("The process should have been killed"),
+            }
+        }
+    }
+}
+
+#[cfg(target_os = "linux")]
+#[test]
+fn test_ptrace_interrupt() {
+    use nix::sys::ptrace;
+    use nix::sys::signal::Signal;
+    use nix::sys::wait::{waitpid, WaitPidFlag, WaitStatus};
+    use nix::unistd::fork;
+    use nix::unistd::ForkResult::*;
+    use std::thread::sleep;
+    use std::time::Duration;
+
+    require_capability!("test_ptrace_interrupt", CAP_SYS_PTRACE);
+
+    let _m = crate::FORK_MTX.lock();
+
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Child => loop {
+            sleep(Duration::from_millis(1000));
+        },
+        Parent { child } => {
+            ptrace::seize(child, ptrace::Options::PTRACE_O_TRACESYSGOOD)
+                .unwrap();
+            ptrace::interrupt(child).unwrap();
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::PtraceEvent(child, Signal::SIGTRAP, 128))
+            );
+            ptrace::syscall(child, None).unwrap();
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::PtraceSyscall(child))
+            );
+            ptrace::detach(child, Some(Signal::SIGKILL)).unwrap();
+            match waitpid(child, None) {
+                Ok(WaitStatus::Signaled(pid, Signal::SIGKILL, _))
+                    if pid == child =>
+                {
+                    let _ = waitpid(child, Some(WaitPidFlag::WNOHANG));
+                    while ptrace::cont(child, Some(Signal::SIGKILL)).is_ok() {
+                        let _ = waitpid(child, Some(WaitPidFlag::WNOHANG));
+                    }
+                }
+                _ => panic!("The process should have been killed"),
+            }
+        }
+    }
+}
+
+// ptrace::{setoptions, getregs} are only available in these platforms
+#[cfg(all(
+    target_os = "linux",
+    any(target_arch = "x86_64", target_arch = "x86"),
+    target_env = "gnu"
+))]
+#[test]
+fn test_ptrace_syscall() {
+    use nix::sys::ptrace;
+    use nix::sys::signal::kill;
+    use nix::sys::signal::Signal;
+    use nix::sys::wait::{waitpid, WaitStatus};
+    use nix::unistd::fork;
+    use nix::unistd::getpid;
+    use nix::unistd::ForkResult::*;
+
+    require_capability!("test_ptrace_syscall", CAP_SYS_PTRACE);
+
+    let _m = crate::FORK_MTX.lock();
+
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Child => {
+            ptrace::traceme().unwrap();
+            // first sigstop until parent is ready to continue
+            let pid = getpid();
+            kill(pid, Signal::SIGSTOP).unwrap();
+            kill(pid, Signal::SIGTERM).unwrap();
+            unsafe {
+                ::libc::_exit(0);
+            }
+        }
+
+        Parent { child } => {
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::Stopped(child, Signal::SIGSTOP))
+            );
+
+            // set this option to recognize syscall-stops
+            ptrace::setoptions(child, ptrace::Options::PTRACE_O_TRACESYSGOOD)
+                .unwrap();
+
+            #[cfg(target_arch = "x86_64")]
+            let get_syscall_id =
+                || ptrace::getregs(child).unwrap().orig_rax as libc::c_long;
+
+            #[cfg(target_arch = "x86")]
+            let get_syscall_id =
+                || ptrace::getregs(child).unwrap().orig_eax as libc::c_long;
+
+            // this duplicates `get_syscall_id` for the purpose of testing `ptrace::read_user`.
+            #[cfg(target_arch = "x86_64")]
+            let rax_offset = offset_of!(libc::user_regs_struct, orig_rax);
+            #[cfg(target_arch = "x86")]
+            let rax_offset = offset_of!(libc::user_regs_struct, orig_eax);
+
+            let get_syscall_from_user_area = || {
+                // Find the offset of `user.regs.rax` (or `user.regs.eax` for x86)
+                let rax_offset = offset_of!(libc::user, regs) + rax_offset;
+                ptrace::read_user(child, rax_offset as _).unwrap()
+                    as libc::c_long
+            };
+
+            // kill entry
+            ptrace::syscall(child, None).unwrap();
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::PtraceSyscall(child))
+            );
+            assert_eq!(get_syscall_id(), ::libc::SYS_kill);
+            assert_eq!(get_syscall_from_user_area(), ::libc::SYS_kill);
+
+            // kill exit
+            ptrace::syscall(child, None).unwrap();
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::PtraceSyscall(child))
+            );
+            assert_eq!(get_syscall_id(), ::libc::SYS_kill);
+            assert_eq!(get_syscall_from_user_area(), ::libc::SYS_kill);
+
+            // receive signal
+            ptrace::syscall(child, None).unwrap();
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::Stopped(child, Signal::SIGTERM))
+            );
+
+            // inject signal
+            ptrace::syscall(child, Signal::SIGTERM).unwrap();
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::Signaled(child, Signal::SIGTERM, false))
+            );
+        }
+    }
+}
diff --git a/vendor/nix/test/sys/test_select.rs b/vendor/nix/test/sys/test_select.rs
new file mode 100644
index 000000000..79f75de3b
--- /dev/null
+++ b/vendor/nix/test/sys/test_select.rs
@@ -0,0 +1,82 @@
+use nix::sys::select::*;
+use nix::sys::signal::SigSet;
+use nix::sys::time::{TimeSpec, TimeValLike};
+use nix::unistd::{pipe, write};
+use std::os::unix::io::{AsRawFd, BorrowedFd, FromRawFd, OwnedFd};
+
+#[test]
+pub fn test_pselect() {
+    let _mtx = crate::SIGNAL_MTX.lock();
+
+    let (r1, w1) = pipe().unwrap();
+    write(w1, b"hi!").unwrap();
+    let r1 = unsafe { OwnedFd::from_raw_fd(r1) };
+    let (r2, _w2) = pipe().unwrap();
+    let r2 = unsafe { OwnedFd::from_raw_fd(r2) };
+
+    let mut fd_set = FdSet::new();
+    fd_set.insert(&r1);
+    fd_set.insert(&r2);
+
+    let timeout = TimeSpec::seconds(10);
+    let sigmask = SigSet::empty();
+    assert_eq!(
+        1,
+        pselect(None, &mut fd_set, None, None, &timeout, &sigmask).unwrap()
+    );
+    assert!(fd_set.contains(&r1));
+    assert!(!fd_set.contains(&r2));
+}
+
+#[test]
+pub fn test_pselect_nfds2() {
+    let (r1, w1) = pipe().unwrap();
+    write(w1, b"hi!").unwrap();
+    let r1 = unsafe { OwnedFd::from_raw_fd(r1) };
+    let (r2, _w2) = pipe().unwrap();
+    let r2 = unsafe { OwnedFd::from_raw_fd(r2) };
+
+    let mut fd_set = FdSet::new();
+    fd_set.insert(&r1);
+    fd_set.insert(&r2);
+
+    let timeout = TimeSpec::seconds(10);
+    assert_eq!(
+        1,
+        pselect(
+            std::cmp::max(r1.as_raw_fd(), r2.as_raw_fd()) + 1,
+            &mut fd_set,
+            None,
+            None,
+            &timeout,
+            None
+        )
+        .unwrap()
+    );
+    assert!(fd_set.contains(&r1));
+    assert!(!fd_set.contains(&r2));
+}
+
+macro_rules! generate_fdset_bad_fd_tests {
+    ($fd:expr, $($method:ident),* $(,)?) => {
+        $(
+            #[test]
+            #[should_panic]
+            fn $method() {
+                let bad_fd = unsafe{BorrowedFd::borrow_raw($fd)};
+                FdSet::new().$method(&bad_fd);
+            }
+        )*
+    }
+}
+
+mod test_fdset_too_large_fd {
+    use super::*;
+    use std::convert::TryInto;
+    generate_fdset_bad_fd_tests!(
+        FD_SETSIZE.try_into().unwrap(),
+        insert,
+        remove,
+        contains,
+    );
+}
diff --git a/vendor/nix/test/sys/test_signal.rs b/vendor/nix/test/sys/test_signal.rs
new file mode 100644
index 000000000..ca25ff9ab
--- /dev/null
+++ b/vendor/nix/test/sys/test_signal.rs
@@ -0,0 +1,143 @@
+#[cfg(not(target_os = "redox"))]
+use nix::errno::Errno;
+use nix::sys::signal::*;
+use nix::unistd::*;
+use std::convert::TryFrom;
+use std::sync::atomic::{AtomicBool, Ordering};
+
+#[test]
+fn test_kill_none() {
+    kill(getpid(), None).expect("Should be able to send signal to myself.");
+}
+
+#[test]
+#[cfg(not(target_os = "fuchsia"))]
+fn test_killpg_none() {
+    killpg(getpgrp(), None)
+        .expect("Should be able to send signal to my process group.");
+}
+
+#[test]
+fn test_old_sigaction_flags() {
+    let _m = crate::SIGNAL_MTX.lock();
+
+    extern "C" fn handler(_: ::libc::c_int) {}
+    let act = SigAction::new(
+        SigHandler::Handler(handler),
+        SaFlags::empty(),
+        SigSet::empty(),
+    );
+    let oact = unsafe { sigaction(SIGINT, &act) }.unwrap();
+    let _flags = oact.flags();
+    let oact = unsafe { sigaction(SIGINT, &act) }.unwrap();
+    let _flags = oact.flags();
+}
+
+#[test]
+fn test_sigprocmask_noop() {
+    sigprocmask(SigmaskHow::SIG_BLOCK, None, None)
+        .expect("this should be an effective noop");
+}
+
+#[test]
+fn test_sigprocmask() {
+    let _m = crate::SIGNAL_MTX.lock();
+
+    // This needs to be a signal that rust doesn't use in the test harness.
+    const SIGNAL: Signal = Signal::SIGCHLD;
+
+    let mut old_signal_set = SigSet::empty();
+    sigprocmask(SigmaskHow::SIG_BLOCK, None, Some(&mut old_signal_set))
+        .expect("expect to be able to retrieve old signals");
+
+    // Make sure the old set doesn't contain the signal, otherwise the following
+    // test don't make sense.
+    assert!(
+        !old_signal_set.contains(SIGNAL),
+        "the {SIGNAL:?} signal is already blocked, please change to a \
+             different one"
+    );
+
+    // Now block the signal.
+    let mut signal_set = SigSet::empty();
+    signal_set.add(SIGNAL);
+    sigprocmask(SigmaskHow::SIG_BLOCK, Some(&signal_set), None)
+        .expect("expect to be able to block signals");
+
+    // And test it again, to make sure the change was effective.
+    old_signal_set.clear();
+    sigprocmask(SigmaskHow::SIG_BLOCK, None, Some(&mut old_signal_set))
+        .expect("expect to be able to retrieve old signals");
+    assert!(
+        old_signal_set.contains(SIGNAL),
+        "expected the {SIGNAL:?} to be blocked"
+    );
+
+    // Reset the signal.
+    sigprocmask(SigmaskHow::SIG_UNBLOCK, Some(&signal_set), None)
+        .expect("expect to be able to block signals");
+}
+
+static SIGNALED: AtomicBool = AtomicBool::new(false);
+
+extern "C" fn test_sigaction_handler(signal: libc::c_int) {
+    let signal = Signal::try_from(signal).unwrap();
+    SIGNALED.store(signal == Signal::SIGINT, Ordering::Relaxed);
+}
+
+#[cfg(not(target_os = "redox"))]
+extern "C" fn test_sigaction_action(
+    _: libc::c_int,
+    _: *mut libc::siginfo_t,
+    _: *mut libc::c_void,
+) {
+}
+
+#[test]
+#[cfg(not(target_os = "redox"))]
+fn test_signal_sigaction() {
+    let _m = crate::SIGNAL_MTX.lock();
+
+    let action_handler = SigHandler::SigAction(test_sigaction_action);
+    assert_eq!(
+        unsafe { signal(Signal::SIGINT, action_handler) }.unwrap_err(),
+        Errno::ENOTSUP
+    );
+}
+
+#[test]
+fn test_signal() {
+    let _m = crate::SIGNAL_MTX.lock();
+
+    unsafe { signal(Signal::SIGINT, SigHandler::SigIgn) }.unwrap();
+    raise(Signal::SIGINT).unwrap();
+    assert_eq!(
+        unsafe { signal(Signal::SIGINT, SigHandler::SigDfl) }.unwrap(),
+        SigHandler::SigIgn
+    );
+
+    let handler = SigHandler::Handler(test_sigaction_handler);
+    assert_eq!(
+        unsafe { signal(Signal::SIGINT, handler) }.unwrap(),
+        SigHandler::SigDfl
+    );
+    raise(Signal::SIGINT).unwrap();
+    assert!(SIGNALED.load(Ordering::Relaxed));
+
+    #[cfg(not(any(target_os = "illumos", target_os = "solaris")))]
+    assert_eq!(
+        unsafe { signal(Signal::SIGINT, SigHandler::SigDfl) }.unwrap(),
+        handler
+    );
+
+    // System V based OSes (e.g. illumos and Solaris) always resets the
+    // disposition to SIG_DFL prior to calling the signal handler
+    #[cfg(any(target_os = "illumos", target_os = "solaris"))]
+    assert_eq!(
+        unsafe { signal(Signal::SIGINT, SigHandler::SigDfl) }.unwrap(),
+        SigHandler::SigDfl
+    );
+
+    // Restore default signal handler
+    unsafe { signal(Signal::SIGINT, SigHandler::SigDfl) }.unwrap();
+}
diff --git a/vendor/nix/test/sys/test_signalfd.rs b/vendor/nix/test/sys/test_signalfd.rs
new file mode 100644
index 000000000..87153c957
--- /dev/null
+++ b/vendor/nix/test/sys/test_signalfd.rs
@@ -0,0 +1,27 @@
+use std::convert::TryFrom;
+
+#[test]
+fn test_signalfd() {
+    use nix::sys::signal::{self, raise, SigSet, Signal};
+    use nix::sys::signalfd::SignalFd;
+
+    // Grab the mutex for altering signals so we don't interfere with other tests.
+    let _m = crate::SIGNAL_MTX.lock();
+
+    // Block the SIGUSR1 signal from automatic processing for this thread
+    let mut mask = SigSet::empty();
+    mask.add(signal::SIGUSR1);
+    mask.thread_block().unwrap();
+
+    let mut fd = SignalFd::new(&mask).unwrap();
+
+    // Send a SIGUSR1 signal to the current process. Note that this uses `raise` instead of `kill`
+    // because `kill` with `getpid` isn't correct during multi-threaded execution like during a
+    // cargo test session. Instead use `raise` which does the correct thing by default.
+    raise(signal::SIGUSR1).expect("Error: raise(SIGUSR1) failed");
+
+    // And now catch that same signal.
+    let res = fd.read_signal().unwrap().unwrap();
+    let signo = Signal::try_from(res.ssi_signo as i32).unwrap();
+    assert_eq!(signo, signal::SIGUSR1);
+}
diff --git a/vendor/nix/test/sys/test_socket.rs b/vendor/nix/test/sys/test_socket.rs
new file mode 100644
index 000000000..ed1686e87
--- /dev/null
+++ b/vendor/nix/test/sys/test_socket.rs
@@ -0,0 +1,2687 @@
+#[cfg(any(target_os = "linux", target_os = "android"))]
+use crate::*;
+use libc::c_char;
+use nix::sys::socket::{getsockname, AddressFamily, UnixAddr};
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
+use std::net::{SocketAddrV4, SocketAddrV6};
+use std::os::unix::io::{AsRawFd, RawFd};
+use std::path::Path;
+use std::slice;
+use std::str::FromStr;
+
+#[cfg(target_os = "linux")]
+#[cfg_attr(qemu, ignore)]
+#[test]
+pub fn test_timestamping() {
+    use nix::sys::socket::{
+        recvmsg, sendmsg, setsockopt, socket, sockopt::Timestamping,
+        ControlMessageOwned, MsgFlags, SockFlag, SockType, SockaddrIn,
+        TimestampingFlag,
+    };
+    use std::io::{IoSlice, IoSliceMut};
+
+    let sock_addr = SockaddrIn::from_str("127.0.0.1:6790").unwrap();
+
+    let ssock = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("send socket failed");
+
+    let rsock = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    nix::sys::socket::bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+
+    setsockopt(&rsock, Timestamping, &TimestampingFlag::all()).unwrap();
+
+    let sbuf = [0u8; 2048];
+    let mut rbuf = [0u8; 2048];
+    let flags = MsgFlags::empty();
+    let iov1 = [IoSlice::new(&sbuf)];
+    let mut iov2 = [IoSliceMut::new(&mut rbuf)];
+
+    let mut cmsg = cmsg_space!(nix::sys::socket::Timestamps);
+    sendmsg(ssock.as_raw_fd(), &iov1, &[], flags, Some(&sock_addr)).unwrap();
+    let recv =
+        recvmsg::<()>(rsock.as_raw_fd(), &mut iov2, Some(&mut cmsg), flags)
+            .unwrap();
+
+    let mut ts = None;
+    for c in recv.cmsgs() {
+        if let ControlMessageOwned::ScmTimestampsns(timestamps) = c {
+            ts = Some(timestamps.system);
+        }
+    }
+    let ts = ts.expect("ScmTimestampns is present");
+    let sys_time =
+        ::nix::time::clock_gettime(::nix::time::ClockId::CLOCK_REALTIME)
+            .unwrap();
+    let diff = if ts > sys_time {
+        ts - sys_time
+    } else {
+        sys_time - ts
+    };
+    assert!(std::time::Duration::from(diff).as_secs() < 60);
+}
+
+#[test]
+pub fn test_path_to_sock_addr() {
+    let path = "/foo/bar";
+    let actual = Path::new(path);
+    let addr = UnixAddr::new(actual).unwrap();
+
+    let expect: &[c_char] = unsafe {
+        slice::from_raw_parts(path.as_ptr() as *const c_char, path.len())
+    };
+    assert_eq!(unsafe { &(*addr.as_ptr()).sun_path[..8] }, expect);
+
+    assert_eq!(addr.path(), Some(actual));
+}
+
+fn calculate_hash<T: Hash>(t: &T) -> u64 {
+    let mut s = DefaultHasher::new();
+    t.hash(&mut s);
+    s.finish()
+}
+
+#[test]
+pub fn test_addr_equality_path() {
+    let path = "/foo/bar";
+    let actual = Path::new(path);
+    let addr1 = UnixAddr::new(actual).unwrap();
+    let mut addr2 = addr1;
+
+    unsafe { (*addr2.as_mut_ptr()).sun_path[10] = 127 };
+
+    assert_eq!(addr1, addr2);
+    assert_eq!(calculate_hash(&addr1), calculate_hash(&addr2));
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[test]
+pub fn test_abstract_sun_path_too_long() {
+    let name = String::from("nix\0abstract\0tesnix\0abstract\0tesnix\0abstract\0tesnix\0abstract\0tesnix\0abstract\0testttttnix\0abstract\0test\0make\0sure\0this\0is\0long\0enough");
+    let addr = UnixAddr::new_abstract(name.as_bytes());
+    addr.expect_err("assertion failed");
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[test]
+pub fn test_addr_equality_abstract() {
+    let name = String::from("nix\0abstract\0test");
+    let addr1 = UnixAddr::new_abstract(name.as_bytes()).unwrap();
+    let mut addr2 = addr1;
+
+    assert_eq!(addr1, addr2);
+    assert_eq!(calculate_hash(&addr1), calculate_hash(&addr2));
+
+    unsafe { (*addr2.as_mut_ptr()).sun_path[17] = 127 };
+    assert_ne!(addr1, addr2);
+    assert_ne!(calculate_hash(&addr1), calculate_hash(&addr2));
+}
+
+// Test getting/setting abstract addresses (without unix socket creation)
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[test]
+pub fn test_abstract_uds_addr() {
+    let empty = String::new();
+    let addr = UnixAddr::new_abstract(empty.as_bytes()).unwrap();
+    let sun_path: [u8; 0] = [];
+    assert_eq!(addr.as_abstract(), Some(&sun_path[..]));
+
+    let name = String::from("nix\0abstract\0test");
+    let addr = UnixAddr::new_abstract(name.as_bytes()).unwrap();
+    let sun_path = [
+        110u8, 105, 120, 0, 97, 98, 115, 116, 114, 97, 99, 116, 0, 116, 101,
+        115, 116,
+    ];
+    assert_eq!(addr.as_abstract(), Some(&sun_path[..]));
+    assert_eq!(addr.path(), None);
+
+    // Internally, name is null-prefixed (abstract namespace)
+    assert_eq!(unsafe { (*addr.as_ptr()).sun_path[0] }, 0);
+}
+
+// Test getting an unnamed address (without unix socket creation)
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[test]
+pub fn test_unnamed_uds_addr() {
+    use crate::nix::sys::socket::SockaddrLike;
+
+    let addr = UnixAddr::new_unnamed();
+
+    assert!(addr.is_unnamed());
+    assert_eq!(addr.len(), 2);
+    assert!(addr.path().is_none());
+    assert_eq!(addr.path_len(), 0);
+
+    assert!(addr.as_abstract().is_none());
+}
+
+#[test]
+pub fn test_getsockname() {
+    use nix::sys::socket::bind;
+    use nix::sys::socket::{socket, AddressFamily, SockFlag, SockType};
+
+    let tempdir = tempfile::tempdir().unwrap();
+    let sockname = tempdir.path().join("sock");
+    let sock = socket(
+        AddressFamily::Unix,
+        SockType::Stream,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+    let sockaddr = UnixAddr::new(&sockname).unwrap();
+    bind(sock.as_raw_fd(), &sockaddr).expect("bind failed");
+    assert_eq!(
+        sockaddr,
+        getsockname(sock.as_raw_fd()).expect("getsockname failed")
+    );
+}
+
+#[test]
+pub fn test_socketpair() {
+    use nix::sys::socket::{socketpair, AddressFamily, SockFlag, SockType};
+    use nix::unistd::{read, write};
+
+    let (fd1, fd2) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+    write(fd1.as_raw_fd(), b"hello").unwrap();
+    let mut buf = [0; 5];
+    read(fd2.as_raw_fd(), &mut buf).unwrap();
+
+    assert_eq!(&buf[..], b"hello");
+}
+
+#[test]
+pub fn test_recvmsg_sockaddr_un() {
+    use nix::sys::socket::{
+        self, bind, socket, AddressFamily, MsgFlags, SockFlag, SockType,
+    };
+
+    let tempdir = tempfile::tempdir().unwrap();
+    let sockname = tempdir.path().join("sock");
+    let sock = socket(
+        AddressFamily::Unix,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+    let sockaddr = UnixAddr::new(&sockname).unwrap();
+    bind(sock.as_raw_fd(), &sockaddr).expect("bind failed");
+
+    // Send a message
+    let send_buffer = "hello".as_bytes();
+    if let Err(e) = socket::sendmsg(
+        sock.as_raw_fd(),
+        &[std::io::IoSlice::new(send_buffer)],
+        &[],
+        MsgFlags::empty(),
+        Some(&sockaddr),
+    ) {
+        crate::skip!("Couldn't send ({e:?}), so skipping test");
+    }
+
+    // Receive the message
+    let mut recv_buffer = [0u8; 32];
+    let mut iov = [std::io::IoSliceMut::new(&mut recv_buffer)];
+    let received =
+        socket::recvmsg(sock.as_raw_fd(), &mut iov, None, MsgFlags::empty())
+            .unwrap();
+    // Check the address in the received message
+    assert_eq!(sockaddr, received.address.unwrap());
+}
+
+#[test]
+pub fn test_std_conversions() {
+    use nix::sys::socket::*;
+
+    let std_sa = SocketAddrV4::from_str("127.0.0.1:6789").unwrap();
+    let sock_addr = SockaddrIn::from(std_sa);
+    assert_eq!(std_sa, sock_addr.into());
+
+    let std_sa = SocketAddrV6::from_str("[::1]:6000").unwrap();
+    let sock_addr: SockaddrIn6 = SockaddrIn6::from(std_sa);
+    assert_eq!(std_sa, sock_addr.into());
+}
+
+mod recvfrom {
+    use super::*;
+    use nix::sys::socket::*;
+    use nix::{errno::Errno, Result};
+    use std::thread;
+
+    const MSG: &[u8] = b"Hello, World!";
+
+    fn sendrecv<Fs, Fr>(
+        rsock: RawFd,
+        ssock: RawFd,
+        f_send: Fs,
+        mut f_recv: Fr,
+    ) -> Option<SockaddrStorage>
+    where
+        Fs: Fn(RawFd, &[u8], MsgFlags) -> Result<usize> + Send + 'static,
+        Fr: FnMut(usize, Option<SockaddrStorage>),
+    {
+        let mut buf: [u8; 13] = [0u8; 13];
+        let mut l = 0;
+        let mut from = None;
+
+        let send_thread = thread::spawn(move || {
+            let mut l = 0;
+            while l < std::mem::size_of_val(MSG) {
+                l += f_send(ssock, &MSG[l..], MsgFlags::empty()).unwrap();
+            }
+        });
+
+        while l < std::mem::size_of_val(MSG) {
+            let (len, from_) = recvfrom(rsock, &mut buf[l..]).unwrap();
+            f_recv(len, from_);
+            from = from_;
+            l += len;
+        }
+        assert_eq!(&buf, MSG);
+        send_thread.join().unwrap();
+        from
+    }
+
+    #[test]
+    pub fn stream() {
+        let (fd2, fd1) = socketpair(
+            AddressFamily::Unix,
+            SockType::Stream,
+            None,
+            SockFlag::empty(),
+        )
+        .unwrap();
+        // Ignore from for stream sockets
+        let _ = sendrecv(fd1.as_raw_fd(), fd2.as_raw_fd(), send, |_, _| {});
+    }
+
+    #[test]
+    pub fn udp() {
+        let std_sa = SocketAddrV4::from_str("127.0.0.1:6789").unwrap();
+        let sock_addr = SockaddrIn::from(std_sa);
+        let rsock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .unwrap();
+        bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+        let ssock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+        let from = sendrecv(
+            rsock.as_raw_fd(),
+            ssock.as_raw_fd(),
+            move |s, m, flags| sendto(s.as_raw_fd(), m, &sock_addr, flags),
+            |_, _| {},
+        );
+        // UDP sockets should set the from address
+        assert_eq!(AddressFamily::Inet, from.unwrap().family().unwrap());
+    }
+
+    #[cfg(target_os = "linux")]
+    mod udp_offload {
+        use super::*;
+        use nix::sys::socket::sockopt::{UdpGroSegment, UdpGsoSegment};
+        use std::io::IoSlice;
+
+        #[test]
+        // Disable the test under emulation because it fails in Cirrus-CI.  Lack
+        // of QEMU support is suspected.
+        #[cfg_attr(qemu, ignore)]
+        pub fn gso() {
+            require_kernel_version!(udp_offload::gso, ">= 4.18");
+
+            // In this test, we send the data and provide a GSO segment size.
+            // Since we are sending the buffer of size 13, six UDP packets
+            // with size 2 and two UDP packet with size 1 will be sent.
+            let segment_size: u16 = 2;
+
+            let sock_addr = SockaddrIn::new(127, 0, 0, 1, 6791);
+            let rsock = socket(
+                AddressFamily::Inet,
+                SockType::Datagram,
+                SockFlag::empty(),
+                None,
+            )
+            .unwrap();
+
+            setsockopt(&rsock, UdpGsoSegment, &(segment_size as _))
+                .expect("setsockopt UDP_SEGMENT failed");
+
+            bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+            let ssock = socket(
+                AddressFamily::Inet,
+                SockType::Datagram,
+                SockFlag::empty(),
+                None,
+            )
+            .expect("send socket failed");
+
+            let mut num_packets_received: i32 = 0;
+
+            sendrecv(
+                rsock.as_raw_fd(),
+                ssock.as_raw_fd(),
+                move |s, m, flags| {
+                    let iov = [IoSlice::new(m)];
+                    let cmsg = ControlMessage::UdpGsoSegments(&segment_size);
+                    sendmsg(
+                        s.as_raw_fd(),
+                        &iov,
+                        &[cmsg],
+                        flags,
+                        Some(&sock_addr),
+                    )
+                },
+                {
+                    let num_packets_received_ref = &mut num_packets_received;
+
+                    move |len, _| {
+                        // check that we receive UDP packets with payload size
+                        // less or equal to segment size
+                        assert!(len <= segment_size as usize);
+                        *num_packets_received_ref += 1;
+                    }
+                },
+            );
+
+            // Buffer size is 13, we will receive six packets of size 2,
+            // and one packet of size 1.
+            assert_eq!(7, num_packets_received);
+        }
+
+        #[test]
+        // Disable the test on emulated platforms because it fails in Cirrus-CI.
+        // Lack of QEMU support is suspected.
+        #[cfg_attr(qemu, ignore)]
+        pub fn gro() {
+            require_kernel_version!(udp_offload::gro, ">= 5.3");
+
+            // It's hard to guarantee receiving GRO packets. Just checking
+            // that `setsockopt` doesn't fail with error
+
+            let rsock = socket(
+                AddressFamily::Inet,
+                SockType::Datagram,
+                SockFlag::empty(),
+                None,
+            )
+            .unwrap();
+
+            setsockopt(&rsock, UdpGroSegment, &true)
+                .expect("setsockopt UDP_GRO failed");
+        }
+    }
+
+    #[cfg(any(
+        target_os = "linux",
+        target_os = "android",
+        target_os = "freebsd",
+        target_os = "netbsd",
+    ))]
+    #[test]
+    pub fn udp_sendmmsg() {
+        use std::io::IoSlice;
+
+        let std_sa = SocketAddrV4::from_str("127.0.0.1:6793").unwrap();
+        let std_sa2 = SocketAddrV4::from_str("127.0.0.1:6794").unwrap();
+        let sock_addr = SockaddrIn::from(std_sa);
+        let sock_addr2 = SockaddrIn::from(std_sa2);
+
+        let rsock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .unwrap();
+        bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+        let ssock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+
+        let from = sendrecv(
+            rsock.as_raw_fd(),
+            ssock.as_raw_fd(),
+            move |s, m, flags| {
+                let batch_size = 15;
+                let mut iovs = Vec::with_capacity(1 + batch_size);
+                let mut addrs = Vec::with_capacity(1 + batch_size);
+                let mut data = MultiHeaders::preallocate(1 + batch_size, None);
+                let iov = IoSlice::new(m);
+                // first chunk:
+                iovs.push([iov]);
+                addrs.push(Some(sock_addr));
+
+                for _ in 0..batch_size {
+                    iovs.push([iov]);
+                    addrs.push(Some(sock_addr2));
+                }
+
+                let res = sendmmsg(s, &mut data, &iovs, addrs, [], flags)?;
+                let mut sent_messages = 0;
+                let mut sent_bytes = 0;
+                for item in res {
+                    sent_messages += 1;
+                    sent_bytes += item.bytes;
+                }
+                //
+                assert_eq!(sent_messages, iovs.len());
+                assert_eq!(sent_bytes, sent_messages * m.len());
+                Ok(sent_messages)
+            },
+            |_, _| {},
+        );
+        // UDP sockets should set the from address
+        assert_eq!(AddressFamily::Inet, from.unwrap().family().unwrap());
+    }
+
+    #[cfg(any(
+        target_os = "linux",
+        target_os = "android",
+        target_os = "freebsd",
+        target_os = "netbsd",
+    ))]
+    #[test]
+    pub fn udp_recvmmsg() {
+        use nix::sys::socket::{recvmmsg, MsgFlags};
+        use std::io::IoSliceMut;
+
+        const NUM_MESSAGES_SENT: usize = 2;
+        const DATA: [u8; 2] = [1, 2];
+
+        let inet_addr = SocketAddrV4::from_str("127.0.0.1:6798").unwrap();
+        let sock_addr = SockaddrIn::from(inet_addr);
+
+        let rsock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .unwrap();
+        bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+        let ssock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+
+        let send_thread = thread::spawn(move || {
+            for _ in 0..NUM_MESSAGES_SENT {
+                sendto(
+                    ssock.as_raw_fd(),
+                    &DATA[..],
+                    &sock_addr,
+                    MsgFlags::empty(),
+                )
+                .unwrap();
+            }
+        });
+
+        let mut msgs = std::collections::LinkedList::new();
+
+        // Buffers to receive exactly `NUM_MESSAGES_SENT` messages
+        let mut receive_buffers = [[0u8; 32]; NUM_MESSAGES_SENT];
+        msgs.extend(
+            receive_buffers
+                .iter_mut()
+                .map(|buf| [IoSliceMut::new(&mut buf[..])]),
+        );
+
+        let mut data =
+            MultiHeaders::<SockaddrIn>::preallocate(msgs.len(), None);
+
+        let res: Vec<RecvMsg<SockaddrIn>> = recvmmsg(
+            rsock.as_raw_fd(),
+            &mut data,
+            msgs.iter(),
+            MsgFlags::empty(),
+            None,
+        )
+        .expect("recvmmsg")
+        .collect();
+        assert_eq!(res.len(), DATA.len());
+
+        for RecvMsg { address, bytes, .. } in res.into_iter() {
+            assert_eq!(AddressFamily::Inet, address.unwrap().family().unwrap());
+            assert_eq!(DATA.len(), bytes);
+        }
+
+        for buf in &receive_buffers {
+            assert_eq!(&buf[..DATA.len()], DATA);
+        }
+
+        send_thread.join().unwrap();
+    }
+
+    #[cfg(any(
+        target_os = "linux",
+        target_os = "android",
+        target_os = "freebsd",
+        target_os = "netbsd",
+    ))]
+    #[test]
+    pub fn udp_recvmmsg_dontwait_short_read() {
+        use nix::sys::socket::{recvmmsg, MsgFlags};
+        use std::io::IoSliceMut;
+
+        const NUM_MESSAGES_SENT: usize = 2;
+        const DATA: [u8; 4] = [1, 2, 3, 4];
+
+        let inet_addr = SocketAddrV4::from_str("127.0.0.1:6799").unwrap();
+        let sock_addr = SockaddrIn::from(inet_addr);
+
+        let rsock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .unwrap();
+        bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+        let ssock = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+
+        let send_thread = thread::spawn(move || {
+            for _ in 0..NUM_MESSAGES_SENT {
+                sendto(
+                    ssock.as_raw_fd(),
+                    &DATA[..],
+                    &sock_addr,
+                    MsgFlags::empty(),
+                )
+                .unwrap();
+            }
+        });
+        // Ensure we've sent all the messages before continuing so `recvmmsg`
+        // will return right away
+        send_thread.join().unwrap();
+
+        let mut msgs = std::collections::LinkedList::new();
+
+        // Buffers to receive >`NUM_MESSAGES_SENT` messages to ensure `recvmmsg`
+        // will return when there are fewer than requested messages in the
+        // kernel buffers when using `MSG_DONTWAIT`.
+        let mut receive_buffers = [[0u8; 32]; NUM_MESSAGES_SENT + 2];
+        msgs.extend(
+            receive_buffers
+                .iter_mut()
+                .map(|buf| [IoSliceMut::new(&mut buf[..])]),
+        );
+
+        let mut data = MultiHeaders::<SockaddrIn>::preallocate(
+            NUM_MESSAGES_SENT + 2,
+            None,
+        );
+
+        let res: Vec<RecvMsg<SockaddrIn>> = recvmmsg(
+            rsock.as_raw_fd(),
+            &mut data,
+            msgs.iter(),
+            MsgFlags::MSG_DONTWAIT,
+            None,
+        )
+        .expect("recvmmsg")
+        .collect();
+        assert_eq!(res.len(), NUM_MESSAGES_SENT);
+
+        for RecvMsg { address, bytes, .. } in res.into_iter() {
+            assert_eq!(AddressFamily::Inet, address.unwrap().family().unwrap());
+            assert_eq!(DATA.len(), bytes);
+        }
+
+        for buf in &receive_buffers[..NUM_MESSAGES_SENT] {
+            assert_eq!(&buf[..DATA.len()], DATA);
+        }
+    }
+
+    #[test]
+    pub fn udp_inet6() {
+        let addr = std::net::Ipv6Addr::from_str("::1").unwrap();
+        let rport = 6789;
+        let rstd_sa = SocketAddrV6::new(addr, rport, 0, 0);
+        let raddr = SockaddrIn6::from(rstd_sa);
+        let sport = 6790;
+        let sstd_sa = SocketAddrV6::new(addr, sport, 0, 0);
+        let saddr = SockaddrIn6::from(sstd_sa);
+        let rsock = socket(
+            AddressFamily::Inet6,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("receive socket failed");
+        match bind(rsock.as_raw_fd(), &raddr) {
+            Err(Errno::EADDRNOTAVAIL) => {
+                println!("IPv6 not available, skipping test.");
+                return;
+            }
+            Err(e) => panic!("bind: {e}"),
+            Ok(()) => (),
+        }
+        let ssock = socket(
+            AddressFamily::Inet6,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+        bind(ssock.as_raw_fd(), &saddr).unwrap();
+        let from = sendrecv(
+            rsock.as_raw_fd(),
+            ssock.as_raw_fd(),
+            move |s, m, flags| sendto(s.as_raw_fd(), m, &raddr, flags),
+            |_, _| {},
+        );
+        assert_eq!(AddressFamily::Inet6, from.unwrap().family().unwrap());
+        let osent_addr = from.unwrap();
+        let sent_addr = osent_addr.as_sockaddr_in6().unwrap();
+        assert_eq!(sent_addr.ip(), addr);
+        assert_eq!(sent_addr.port(), sport);
+    }
+}
+
+// Test error handling of our recvmsg wrapper
+#[test]
+pub fn test_recvmsg_ebadf() {
+    use nix::errno::Errno;
+    use nix::sys::socket::{recvmsg, MsgFlags};
+    use std::io::IoSliceMut;
+
+    let mut buf = [0u8; 5];
+    let mut iov = [IoSliceMut::new(&mut buf[..])];
+
+    let fd = -1; // Bad file descriptor
+    let r = recvmsg::<()>(fd.as_raw_fd(), &mut iov, None, MsgFlags::empty());
+
+    assert_eq!(r.err().unwrap(), Errno::EBADF);
+}
+
+// Disable the test on emulated platforms due to a bug in QEMU versions <
+// 2.12.0.  https://bugs.launchpad.net/qemu/+bug/1701808
+#[cfg_attr(qemu, ignore)]
+#[test]
+pub fn test_scm_rights() {
+    use nix::sys::socket::{
+        recvmsg, sendmsg, socketpair, AddressFamily, ControlMessage,
+        ControlMessageOwned, MsgFlags, SockFlag, SockType,
+    };
+    use nix::unistd::{close, pipe, read, write};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let (fd1, fd2) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+    let (r, w) = pipe().unwrap();
+    let mut received_r: Option<RawFd> = None;
+
+    {
+        let iov = [IoSlice::new(b"hello")];
+        let fds = [r];
+        let cmsg = ControlMessage::ScmRights(&fds);
+        assert_eq!(
+            sendmsg::<()>(
+                fd1.as_raw_fd(),
+                &iov,
+                &[cmsg],
+                MsgFlags::empty(),
+                None
+            )
+            .unwrap(),
+            5
+        );
+        close(r).unwrap();
+    }
+
+    {
+        let mut buf = [0u8; 5];
+
+        let mut iov = [IoSliceMut::new(&mut buf[..])];
+        let mut cmsgspace = cmsg_space!([RawFd; 1]);
+        let msg = recvmsg::<()>(
+            fd2.as_raw_fd(),
+            &mut iov,
+            Some(&mut cmsgspace),
+            MsgFlags::empty(),
+        )
+        .unwrap();
+
+        for cmsg in msg.cmsgs() {
+            if let ControlMessageOwned::ScmRights(fd) = cmsg {
+                assert_eq!(received_r, None);
+                assert_eq!(fd.len(), 1);
+                received_r = Some(fd[0]);
+            } else {
+                panic!("unexpected cmsg");
+            }
+        }
+        assert_eq!(msg.bytes, 5);
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+    }
+
+    let received_r = received_r.expect("Did not receive passed fd");
+    // Ensure that the received file descriptor works
+    write(w.as_raw_fd(), b"world").unwrap();
+    let mut buf = [0u8; 5];
+    read(received_r.as_raw_fd(), &mut buf).unwrap();
+    assert_eq!(&buf[..], b"world");
+    close(received_r).unwrap();
+    close(w).unwrap();
+}
+
+// Disable the test on emulated platforms due to not enabled support of AF_ALG in QEMU from rust cross
+#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg_attr(qemu, ignore)]
+#[test]
+pub fn test_af_alg_cipher() {
+    use nix::sys::socket::sockopt::AlgSetKey;
+    use nix::sys::socket::{
+        accept, bind, sendmsg, setsockopt, socket, AddressFamily, AlgAddr,
+        ControlMessage, MsgFlags, SockFlag, SockType,
+    };
+    use nix::unistd::read;
+    use std::io::IoSlice;
+
+    skip_if_cirrus!("Fails for an unknown reason Cirrus CI.  Bug #1352");
+    // Travis's seccomp profile blocks AF_ALG
+    // https://docs.docker.com/engine/security/seccomp/
+    skip_if_seccomp!(test_af_alg_cipher);
+
+    let alg_type = "skcipher";
+    let alg_name = "ctr-aes-aesni";
+    // 256-bits secret key
+    let key = vec![0u8; 32];
+    // 16-bytes IV
+    let iv_len = 16;
+    let iv = vec![1u8; iv_len];
+    // 256-bytes plain payload
+    let payload_len = 256;
+    let payload = vec![2u8; payload_len];
+
+    let sock = socket(
+        AddressFamily::Alg,
+        SockType::SeqPacket,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+
+    let sockaddr = AlgAddr::new(alg_type, alg_name);
+    bind(sock.as_raw_fd(), &sockaddr).expect("bind failed");
+
+    assert_eq!(sockaddr.alg_name().to_string_lossy(), alg_name);
+    assert_eq!(sockaddr.alg_type().to_string_lossy(), alg_type);
+
+    setsockopt(&sock, AlgSetKey::default(), &key).expect("setsockopt");
+    let session_socket = accept(sock.as_raw_fd()).expect("accept failed");
+
+    let msgs = [
+        ControlMessage::AlgSetOp(&libc::ALG_OP_ENCRYPT),
+        ControlMessage::AlgSetIv(iv.as_slice()),
+    ];
+    let iov = IoSlice::new(&payload);
+    sendmsg::<()>(
+        session_socket.as_raw_fd(),
+        &[iov],
+        &msgs,
+        MsgFlags::empty(),
+        None,
+    )
+    .expect("sendmsg encrypt");
+
+    // allocate buffer for encrypted data
+    let mut encrypted = vec![0u8; payload_len];
+    let num_bytes =
+        read(session_socket.as_raw_fd(), &mut encrypted).expect("read encrypt");
+    assert_eq!(num_bytes, payload_len);
+
+    let iov = IoSlice::new(&encrypted);
+
+    let iv = vec![1u8; iv_len];
+
+    let msgs = [
+        ControlMessage::AlgSetOp(&libc::ALG_OP_DECRYPT),
+        ControlMessage::AlgSetIv(iv.as_slice()),
+    ];
+    sendmsg::<()>(
+        session_socket.as_raw_fd(),
+        &[iov],
+        &msgs,
+        MsgFlags::empty(),
+        None,
+    )
+    .expect("sendmsg decrypt");
+
+    // allocate buffer for decrypted data
+    let mut decrypted = vec![0u8; payload_len];
+    let num_bytes =
+        read(session_socket.as_raw_fd(), &mut decrypted).expect("read decrypt");
+
+    assert_eq!(num_bytes, payload_len);
+    assert_eq!(decrypted, payload);
+}
+
+// Disable the test on emulated platforms due to not enabled support of AF_ALG
+// in QEMU from rust cross
+#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg_attr(qemu, ignore)]
+#[test]
+pub fn test_af_alg_aead() {
+    use libc::{ALG_OP_DECRYPT, ALG_OP_ENCRYPT};
+    use nix::fcntl::{fcntl, FcntlArg, OFlag};
+    use nix::sys::socket::sockopt::{AlgSetAeadAuthSize, AlgSetKey};
+    use nix::sys::socket::{
+        accept, bind, sendmsg, setsockopt, socket, AddressFamily, AlgAddr,
+        ControlMessage, MsgFlags, SockFlag, SockType,
+    };
+    use nix::unistd::read;
+    use std::io::IoSlice;
+
+    skip_if_cirrus!("Fails for an unknown reason Cirrus CI.  Bug #1352");
+    // Travis's seccomp profile blocks AF_ALG
+    // https://docs.docker.com/engine/security/seccomp/
+    skip_if_seccomp!(test_af_alg_aead);
+
+    let auth_size = 4usize;
+    let assoc_size = 16u32;
+
+    let alg_type = "aead";
+    let alg_name = "gcm(aes)";
+    // 256-bits secret key
+    let key = vec![0u8; 32];
+    // 12-bytes IV
+    let iv_len = 12;
+    let iv = vec![1u8; iv_len];
+    // 256-bytes plain payload
+    let payload_len = 256;
+    let mut payload =
+        vec![2u8; payload_len + (assoc_size as usize) + auth_size];
+
+    for i in 0..assoc_size {
+        payload[i as usize] = 10;
+    }
+
+    let len = payload.len();
+
+    for i in 0..auth_size {
+        payload[len - 1 - i] = 0;
+    }
+
+    let sock = socket(
+        AddressFamily::Alg,
+        SockType::SeqPacket,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+
+    let sockaddr = AlgAddr::new(alg_type, alg_name);
+    bind(sock.as_raw_fd(), &sockaddr).expect("bind failed");
+
+    setsockopt(&sock, AlgSetAeadAuthSize, &auth_size)
+        .expect("setsockopt AlgSetAeadAuthSize");
+    setsockopt(&sock, AlgSetKey::default(), &key)
+        .expect("setsockopt AlgSetKey");
+    let session_socket = accept(sock.as_raw_fd()).expect("accept failed");
+
+    let msgs = [
+        ControlMessage::AlgSetOp(&ALG_OP_ENCRYPT),
+        ControlMessage::AlgSetIv(iv.as_slice()),
+        ControlMessage::AlgSetAeadAssoclen(&assoc_size),
+    ];
+
+    let iov = IoSlice::new(&payload);
+    sendmsg::<()>(
+        session_socket.as_raw_fd(),
+        &[iov],
+        &msgs,
+        MsgFlags::empty(),
+        None,
+    )
+    .expect("sendmsg encrypt");
+
+    // allocate buffer for encrypted data
+    let mut encrypted =
+        vec![0u8; (assoc_size as usize) + payload_len + auth_size];
+    let num_bytes =
+        read(session_socket.as_raw_fd(), &mut encrypted).expect("read encrypt");
+    assert_eq!(num_bytes, payload_len + auth_size + (assoc_size as usize));
+
+    for i in 0..assoc_size {
+        encrypted[i as usize] = 10;
+    }
+
+    let iov = IoSlice::new(&encrypted);
+
+    let iv = vec![1u8; iv_len];
+
+    let session_socket = accept(sock.as_raw_fd()).expect("accept failed");
+
+    let msgs = [
+        ControlMessage::AlgSetOp(&ALG_OP_DECRYPT),
+        ControlMessage::AlgSetIv(iv.as_slice()),
+        ControlMessage::AlgSetAeadAssoclen(&assoc_size),
+    ];
+    sendmsg::<()>(
+        session_socket.as_raw_fd(),
+        &[iov],
+        &msgs,
+        MsgFlags::empty(),
+        None,
+    )
+    .expect("sendmsg decrypt");
+
+    // allocate buffer for decrypted data
+    let mut decrypted =
+        vec![0u8; payload_len + (assoc_size as usize) + auth_size];
+    // Starting with kernel 4.9, the interface changed slightly such that the
+    // authentication tag memory is only needed in the output buffer for encryption
+    // and in the input buffer for decryption.
+    // Do not block on read, as we may have fewer bytes than buffer size
+    fcntl(session_socket, FcntlArg::F_SETFL(OFlag::O_NONBLOCK))
+        .expect("fcntl non_blocking");
+    let num_bytes =
+        read(session_socket.as_raw_fd(), &mut decrypted).expect("read decrypt");
+
+    assert!(num_bytes >= payload_len + (assoc_size as usize));
+    assert_eq!(
+        decrypted[(assoc_size as usize)..(payload_len + (assoc_size as usize))],
+        payload[(assoc_size as usize)..payload_len + (assoc_size as usize)]
+    );
+}
+
+// Verify `ControlMessage::Ipv4PacketInfo` for `sendmsg`.
+// This creates a (udp) socket bound to localhost, then sends a message to
+// itself but uses Ipv4PacketInfo to force the source address to be localhost.
+//
+// This would be a more interesting test if we could assume that the test host
+// has more than one IP address (since we could select a different address to
+// test from).
+#[cfg(any(target_os = "linux", target_os = "macos", target_os = "netbsd"))]
+#[test]
+pub fn test_sendmsg_ipv4packetinfo() {
+    use cfg_if::cfg_if;
+    use nix::sys::socket::{
+        bind, sendmsg, socket, AddressFamily, ControlMessage, MsgFlags,
+        SockFlag, SockType, SockaddrIn,
+    };
+    use std::io::IoSlice;
+
+    let sock = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+
+    let sock_addr = SockaddrIn::new(127, 0, 0, 1, 4000);
+
+    bind(sock.as_raw_fd(), &sock_addr).expect("bind failed");
+
+    let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+    let iov = [IoSlice::new(&slice)];
+
+    cfg_if! {
+        if #[cfg(target_os = "netbsd")] {
+            let pi = libc::in_pktinfo {
+                ipi_ifindex: 0, /* Unspecified interface */
+                ipi_addr: libc::in_addr { s_addr: 0 },
+            };
+        } else {
+            let pi = libc::in_pktinfo {
+                ipi_ifindex: 0, /* Unspecified interface */
+                ipi_addr: libc::in_addr { s_addr: 0 },
+                ipi_spec_dst: sock_addr.as_ref().sin_addr,
+            };
+        }
+    }
+
+    let cmsg = [ControlMessage::Ipv4PacketInfo(&pi)];
+
+    sendmsg(
+        sock.as_raw_fd(),
+        &iov,
+        &cmsg,
+        MsgFlags::empty(),
+        Some(&sock_addr),
+    )
+    .expect("sendmsg");
+}
+
+// Verify `ControlMessage::Ipv6PacketInfo` for `sendmsg`.
+// This creates a (udp) socket bound to ip6-localhost, then sends a message to
+// itself but uses Ipv6PacketInfo to force the source address to be
+// ip6-localhost.
+//
+// This would be a more interesting test if we could assume that the test host
+// has more than one IP address (since we could select a different address to
+// test from).
+#[cfg(any(
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "freebsd"
+))]
+#[test]
+pub fn test_sendmsg_ipv6packetinfo() {
+    use nix::errno::Errno;
+    use nix::sys::socket::{
+        bind, sendmsg, socket, AddressFamily, ControlMessage, MsgFlags,
+        SockFlag, SockType, SockaddrIn6,
+    };
+    use std::io::IoSlice;
+
+    let sock = socket(
+        AddressFamily::Inet6,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+
+    let std_sa = SocketAddrV6::from_str("[::1]:6000").unwrap();
+    let sock_addr: SockaddrIn6 = SockaddrIn6::from(std_sa);
+
+    if let Err(Errno::EADDRNOTAVAIL) = bind(sock.as_raw_fd(), &sock_addr) {
+        println!("IPv6 not available, skipping test.");
+        return;
+    }
+
+    let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+    let iov = [IoSlice::new(&slice)];
+
+    let pi = libc::in6_pktinfo {
+        ipi6_ifindex: 0, /* Unspecified interface */
+        ipi6_addr: sock_addr.as_ref().sin6_addr,
+    };
+
+    let cmsg = [ControlMessage::Ipv6PacketInfo(&pi)];
+
+    sendmsg::<SockaddrIn6>(
+        sock.as_raw_fd(),
+        &iov,
+        &cmsg,
+        MsgFlags::empty(),
+        Some(&sock_addr),
+    )
+    .expect("sendmsg");
+}
+
+// Verify that ControlMessage::Ipv4SendSrcAddr works for sendmsg. This
+// creates a UDP socket bound to all local interfaces (0.0.0.0). It then
+// sends message to itself at 127.0.0.1 while explicitly specifying
+// 127.0.0.1 as the source address through an Ipv4SendSrcAddr
+// (IP_SENDSRCADDR) control message.
+//
+// Note that binding to 0.0.0.0 is *required* on FreeBSD; sendmsg
+// returns EINVAL otherwise. (See FreeBSD's ip(4) man page.)
+#[cfg(any(
+    target_os = "netbsd",
+    target_os = "freebsd",
+    target_os = "openbsd",
+    target_os = "dragonfly",
+))]
+#[test]
+pub fn test_sendmsg_ipv4sendsrcaddr() {
+    use nix::sys::socket::{
+        bind, sendmsg, socket, AddressFamily, ControlMessage, MsgFlags,
+        SockFlag, SockType, SockaddrIn,
+    };
+    use std::io::IoSlice;
+
+    let sock = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+
+    let unspec_sock_addr = SockaddrIn::new(0, 0, 0, 0, 0);
+    bind(sock.as_raw_fd(), &unspec_sock_addr).expect("bind failed");
+    let bound_sock_addr: SockaddrIn = getsockname(sock.as_raw_fd()).unwrap();
+    let localhost_sock_addr: SockaddrIn =
+        SockaddrIn::new(127, 0, 0, 1, bound_sock_addr.port());
+
+    let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+    let iov = [IoSlice::new(&slice)];
+    let cmsg = [ControlMessage::Ipv4SendSrcAddr(
+        &localhost_sock_addr.as_ref().sin_addr,
+    )];
+
+    sendmsg(
+        sock.as_raw_fd(),
+        &iov,
+        &cmsg,
+        MsgFlags::empty(),
+        Some(&localhost_sock_addr),
+    )
+    .expect("sendmsg");
+}
+
+/// Tests that passing multiple fds using a single `ControlMessage` works.
+// Disable the test on emulated platforms due to a bug in QEMU versions <
+// 2.12.0.  https://bugs.launchpad.net/qemu/+bug/1701808
+#[cfg_attr(qemu, ignore)]
+#[test]
+fn test_scm_rights_single_cmsg_multiple_fds() {
+    use nix::sys::socket::{
+        recvmsg, sendmsg, ControlMessage, ControlMessageOwned, MsgFlags,
+    };
+    use std::io::{IoSlice, IoSliceMut};
+    use std::os::unix::io::{AsRawFd, RawFd};
+    use std::os::unix::net::UnixDatagram;
+    use std::thread;
+
+    let (send, receive) = UnixDatagram::pair().unwrap();
+    let thread = thread::spawn(move || {
+        let mut buf = [0u8; 8];
+        let mut iovec = [IoSliceMut::new(&mut buf)];
+
+        let mut space = cmsg_space!([RawFd; 2]);
+        let msg = recvmsg::<()>(
+            receive.as_raw_fd(),
+            &mut iovec,
+            Some(&mut space),
+            MsgFlags::empty(),
+        )
+        .unwrap();
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+
+        let mut cmsgs = msg.cmsgs();
+        match cmsgs.next() {
+            Some(ControlMessageOwned::ScmRights(fds)) => {
+                assert_eq!(
+                    fds.len(),
+                    2,
+                    "unexpected fd count (expected 2 fds, got {})",
+                    fds.len()
+                );
+            }
+            _ => panic!(),
+        }
+        assert!(cmsgs.next().is_none(), "unexpected control msg");
+
+        assert_eq!(msg.bytes, 8);
+        assert_eq!(*iovec[0], [1u8, 2, 3, 4, 5, 6, 7, 8]);
+    });
+
+    let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+    let iov = [IoSlice::new(&slice)];
+    let fds = [libc::STDIN_FILENO, libc::STDOUT_FILENO]; // pass stdin and stdout
+    let cmsg = [ControlMessage::ScmRights(&fds)];
+    sendmsg::<()>(send.as_raw_fd(), &iov, &cmsg, MsgFlags::empty(), None)
+        .unwrap();
+    thread.join().unwrap();
+}
+
+// Verify `sendmsg` builds a valid `msghdr` when passing an empty
+// `cmsgs` argument.  This should result in a msghdr with a nullptr
+// msg_control field and a msg_controllen of 0 when calling into the
+// raw `sendmsg`.
+#[test]
+pub fn test_sendmsg_empty_cmsgs() {
+    use nix::sys::socket::{
+        recvmsg, sendmsg, socketpair, AddressFamily, MsgFlags, SockFlag,
+        SockType,
+    };
+    use std::io::{IoSlice, IoSliceMut};
+
+    let (fd1, fd2) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+
+    {
+        let iov = [IoSlice::new(b"hello")];
+        assert_eq!(
+            sendmsg::<()>(fd1.as_raw_fd(), &iov, &[], MsgFlags::empty(), None)
+                .unwrap(),
+            5
+        );
+    }
+
+    {
+        let mut buf = [0u8; 5];
+        let mut iov = [IoSliceMut::new(&mut buf[..])];
+
+        let mut cmsgspace = cmsg_space!([RawFd; 1]);
+        let msg = recvmsg::<()>(
+            fd2.as_raw_fd(),
+            &mut iov,
+            Some(&mut cmsgspace),
+            MsgFlags::empty(),
+        )
+        .unwrap();
+
+        for _ in msg.cmsgs() {
+            panic!("unexpected cmsg");
+        }
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+        assert_eq!(msg.bytes, 5);
+    }
+}
+
+#[cfg(any(
+    target_os = "android",
+    target_os = "linux",
+    target_os = "freebsd",
+    target_os = "dragonfly",
+))]
+#[test]
+fn test_scm_credentials() {
+    use nix::sys::socket::{
+        recvmsg, sendmsg, socketpair, AddressFamily, ControlMessage,
+        ControlMessageOwned, MsgFlags, SockFlag, SockType, UnixCredentials,
+    };
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    use nix::sys::socket::{setsockopt, sockopt::PassCred};
+    use nix::unistd::{getgid, getpid, getuid};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let (send, recv) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    setsockopt(&recv, PassCred, &true).unwrap();
+
+    {
+        let iov = [IoSlice::new(b"hello")];
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        let cred = UnixCredentials::new();
+        #[cfg(any(target_os = "android", target_os = "linux"))]
+        let cmsg = ControlMessage::ScmCredentials(&cred);
+        #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
+        let cmsg = ControlMessage::ScmCreds;
+        assert_eq!(
+            sendmsg::<()>(
+                send.as_raw_fd(),
+                &iov,
+                &[cmsg],
+                MsgFlags::empty(),
+                None
+            )
+            .unwrap(),
+            5
+        );
+    }
+
+    {
+        let mut buf = [0u8; 5];
+        let mut iov = [IoSliceMut::new(&mut buf[..])];
+
+        let mut cmsgspace = cmsg_space!(UnixCredentials);
+        let msg = recvmsg::<()>(
+            recv.as_raw_fd(),
+            &mut iov,
+            Some(&mut cmsgspace),
+            MsgFlags::empty(),
+        )
+        .unwrap();
+        let mut received_cred = None;
+
+        for cmsg in msg.cmsgs() {
+            let cred = match cmsg {
+                #[cfg(any(target_os = "android", target_os = "linux"))]
+                ControlMessageOwned::ScmCredentials(cred) => cred,
+                #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
+                ControlMessageOwned::ScmCreds(cred) => cred,
+                other => panic!("unexpected cmsg {other:?}"),
+            };
+            assert!(received_cred.is_none());
+            assert_eq!(cred.pid(), getpid().as_raw());
+            assert_eq!(cred.uid(), getuid().as_raw());
+            assert_eq!(cred.gid(), getgid().as_raw());
+            received_cred = Some(cred);
+        }
+        received_cred.expect("no creds received");
+        assert_eq!(msg.bytes, 5);
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+    }
+}
+
+/// Ensure that we can send `SCM_CREDENTIALS` and `SCM_RIGHTS` with a single
+/// `sendmsg` call.
+#[cfg(any(target_os = "android", target_os = "linux"))]
+// qemu's handling of multiple cmsgs is bugged, ignore tests under emulation
+// see https://bugs.launchpad.net/qemu/+bug/1781280
+#[cfg_attr(qemu, ignore)]
+#[test]
+fn test_scm_credentials_and_rights() {
+    let space = cmsg_space!(libc::ucred, RawFd);
+    test_impl_scm_credentials_and_rights(space);
+}
+
+/// Ensure that passing a an oversized control message buffer to recvmsg
+/// still works.
+#[cfg(any(target_os = "android", target_os = "linux"))]
+// qemu's handling of multiple cmsgs is bugged, ignore tests under emulation
+// see https://bugs.launchpad.net/qemu/+bug/1781280
+#[cfg_attr(qemu, ignore)]
+#[test]
+fn test_too_large_cmsgspace() {
+    let space = vec![0u8; 1024];
+    test_impl_scm_credentials_and_rights(space);
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+fn test_impl_scm_credentials_and_rights(mut space: Vec<u8>) {
+    use libc::ucred;
+    use nix::sys::socket::sockopt::PassCred;
+    use nix::sys::socket::{
+        recvmsg, sendmsg, setsockopt, socketpair, ControlMessage,
+        ControlMessageOwned, MsgFlags, SockFlag, SockType,
+    };
+    use nix::unistd::{close, getgid, getpid, getuid, pipe, write};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let (send, recv) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+    setsockopt(&recv, PassCred, &true).unwrap();
+
+    let (r, w) = pipe().unwrap();
+    let mut received_r: Option<RawFd> = None;
+
+    {
+        let iov = [IoSlice::new(b"hello")];
+        let cred = ucred {
+            pid: getpid().as_raw(),
+            uid: getuid().as_raw(),
+            gid: getgid().as_raw(),
+        }
+        .into();
+        let fds = [r];
+        let cmsgs = [
+            ControlMessage::ScmCredentials(&cred),
+            ControlMessage::ScmRights(&fds),
+        ];
+        assert_eq!(
+            sendmsg::<()>(
+                send.as_raw_fd(),
+                &iov,
+                &cmsgs,
+                MsgFlags::empty(),
+                None
+            )
+            .unwrap(),
+            5
+        );
+        close(r).unwrap();
+    }
+
+    {
+        let mut buf = [0u8; 5];
+        let mut iov = [IoSliceMut::new(&mut buf[..])];
+        let msg = recvmsg::<()>(
+            recv.as_raw_fd(),
+            &mut iov,
+            Some(&mut space),
+            MsgFlags::empty(),
+        )
+        .unwrap();
+        let mut received_cred = None;
+
+        assert_eq!(msg.cmsgs().count(), 2, "expected 2 cmsgs");
+
+        for cmsg in msg.cmsgs() {
+            match cmsg {
+                ControlMessageOwned::ScmRights(fds) => {
+                    assert_eq!(received_r, None, "already received fd");
+                    assert_eq!(fds.len(), 1);
+                    received_r = Some(fds[0]);
+                }
+                ControlMessageOwned::ScmCredentials(cred) => {
+                    assert!(received_cred.is_none());
+                    assert_eq!(cred.pid(), getpid().as_raw());
+                    assert_eq!(cred.uid(), getuid().as_raw());
+                    assert_eq!(cred.gid(), getgid().as_raw());
+                    received_cred = Some(cred);
+                }
+                _ => panic!("unexpected cmsg"),
+            }
+        }
+        received_cred.expect("no creds received");
+        assert_eq!(msg.bytes, 5);
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+    }
+
+    let received_r = received_r.expect("Did not receive passed fd");
+    // Ensure that the received file descriptor works
+    write(w.as_raw_fd(), b"world").unwrap();
+    let mut buf = [0u8; 5];
+    read(received_r.as_raw_fd(), &mut buf).unwrap();
+    assert_eq!(&buf[..], b"world");
+    close(received_r).unwrap();
+    close(w).unwrap();
+}
+
+// Test creating and using named unix domain sockets
+#[test]
+pub fn test_named_unixdomain() {
+    use nix::sys::socket::{accept, bind, connect, listen, socket, UnixAddr};
+    use nix::sys::socket::{SockFlag, SockType};
+    use nix::unistd::{read, write};
+    use std::thread;
+
+    let tempdir = tempfile::tempdir().unwrap();
+    let sockname = tempdir.path().join("sock");
+    let s1 = socket(
+        AddressFamily::Unix,
+        SockType::Stream,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+    let sockaddr = UnixAddr::new(&sockname).unwrap();
+    bind(s1.as_raw_fd(), &sockaddr).expect("bind failed");
+    listen(&s1, 10).expect("listen failed");
+
+    let thr = thread::spawn(move || {
+        let s2 = socket(
+            AddressFamily::Unix,
+            SockType::Stream,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("socket failed");
+        connect(s2.as_raw_fd(), &sockaddr).expect("connect failed");
+        write(s2.as_raw_fd(), b"hello").expect("write failed");
+    });
+
+    let s3 = accept(s1.as_raw_fd()).expect("accept failed");
+
+    let mut buf = [0; 5];
+    read(s3.as_raw_fd(), &mut buf).unwrap();
+    thr.join().unwrap();
+
+    assert_eq!(&buf[..], b"hello");
+}
+
+// Test using unnamed unix domain addresses
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[test]
+pub fn test_unnamed_unixdomain() {
+    use nix::sys::socket::{getsockname, socketpair};
+    use nix::sys::socket::{SockFlag, SockType};
+
+    let (fd_1, _fd_2) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .expect("socketpair failed");
+
+    let addr_1: UnixAddr =
+        getsockname(fd_1.as_raw_fd()).expect("getsockname failed");
+    assert!(addr_1.is_unnamed());
+}
+
+// Test creating and using unnamed unix domain addresses for autobinding sockets
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[test]
+pub fn test_unnamed_unixdomain_autobind() {
+    use nix::sys::socket::{bind, getsockname, socket};
+    use nix::sys::socket::{SockFlag, SockType};
+
+    let fd = socket(
+        AddressFamily::Unix,
+        SockType::Stream,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("socket failed");
+
+    // unix(7): "If a bind(2) call specifies addrlen as `sizeof(sa_family_t)`, or [...], then the
+    // socket is autobound to an abstract address"
+    bind(fd.as_raw_fd(), &UnixAddr::new_unnamed()).expect("bind failed");
+
+    let addr: UnixAddr =
+        getsockname(fd.as_raw_fd()).expect("getsockname failed");
+    let addr = addr.as_abstract().unwrap();
+
+    // changed from 8 to 5 bytes in Linux 2.3.15, and rust's minimum supported Linux version is 3.2
+    // (as of 2022-11)
+    assert_eq!(addr.len(), 5);
+}
+
+// Test creating and using named system control sockets
+#[cfg(any(target_os = "macos", target_os = "ios"))]
+#[test]
+pub fn test_syscontrol() {
+    use nix::errno::Errno;
+    use nix::sys::socket::{
+        socket, SockFlag, SockProtocol, SockType, SysControlAddr,
+    };
+
+    let fd = socket(
+        AddressFamily::System,
+        SockType::Datagram,
+        SockFlag::empty(),
+        SockProtocol::KextControl,
+    )
+    .expect("socket failed");
+    SysControlAddr::from_name(fd.as_raw_fd(), "com.apple.net.utun_control", 0)
+        .expect("resolving sys_control name failed");
+    assert_eq!(
+        SysControlAddr::from_name(fd.as_raw_fd(), "foo.bar.lol", 0).err(),
+        Some(Errno::ENOENT)
+    );
+
+    // requires root privileges
+    // connect(fd.as_raw_fd(), &sockaddr).expect("connect failed");
+}
+
+#[cfg(any(
+    target_os = "android",
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+fn loopback_address(
+    family: AddressFamily,
+) -> Option<nix::ifaddrs::InterfaceAddress> {
+    use nix::ifaddrs::getifaddrs;
+    use nix::net::if_::*;
+    use nix::sys::socket::SockaddrLike;
+    use std::io;
+    use std::io::Write;
+
+    let mut addrs = match getifaddrs() {
+        Ok(iter) => iter,
+        Err(e) => {
+            let stdioerr = io::stderr();
+            let mut handle = stdioerr.lock();
+            writeln!(handle, "getifaddrs: {e:?}").unwrap();
+            return None;
+        }
+    };
+    // return first address matching family
+    addrs.find(|ifaddr| {
+        ifaddr.flags.contains(InterfaceFlags::IFF_LOOPBACK)
+            && ifaddr.address.as_ref().and_then(SockaddrLike::family)
+                == Some(family)
+    })
+}
+
+#[cfg(any(
+    target_os = "android",
+    target_os = "ios",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "netbsd",
+))]
+// qemu doesn't seem to be emulating this correctly in these architectures
+#[cfg_attr(
+    all(
+        qemu,
+        any(
+            target_arch = "mips",
+            target_arch = "mips64",
+            target_arch = "powerpc64",
+        )
+    ),
+    ignore
+)]
+#[test]
+pub fn test_recv_ipv4pktinfo() {
+    use nix::net::if_::*;
+    use nix::sys::socket::sockopt::Ipv4PacketInfo;
+    use nix::sys::socket::{bind, SockFlag, SockType, SockaddrIn};
+    use nix::sys::socket::{getsockname, setsockopt, socket};
+    use nix::sys::socket::{recvmsg, sendmsg, ControlMessageOwned, MsgFlags};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let lo_ifaddr = loopback_address(AddressFamily::Inet);
+    let (lo_name, lo) = match lo_ifaddr {
+        Some(ifaddr) => (
+            ifaddr.interface_name,
+            ifaddr.address.expect("Expect IPv4 address on interface"),
+        ),
+        None => return,
+    };
+    let receive = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("receive socket failed");
+    bind(receive.as_raw_fd(), &lo).expect("bind failed");
+    let sa: SockaddrIn =
+        getsockname(receive.as_raw_fd()).expect("getsockname failed");
+    setsockopt(&receive, Ipv4PacketInfo, &true).expect("setsockopt failed");
+
+    {
+        let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+        let iov = [IoSlice::new(&slice)];
+
+        let send = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+        sendmsg(send.as_raw_fd(), &iov, &[], MsgFlags::empty(), Some(&sa))
+            .expect("sendmsg failed");
+    }
+
+    {
+        let mut buf = [0u8; 8];
+        let mut iovec = [IoSliceMut::new(&mut buf)];
+
+        let mut space = cmsg_space!(libc::in_pktinfo);
+        let msg = recvmsg::<()>(
+            receive.as_raw_fd(),
+            &mut iovec,
+            Some(&mut space),
+            MsgFlags::empty(),
+        )
+        .expect("recvmsg failed");
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+
+        let mut cmsgs = msg.cmsgs();
+        if let Some(ControlMessageOwned::Ipv4PacketInfo(pktinfo)) = cmsgs.next()
+        {
+            let i = if_nametoindex(lo_name.as_bytes()).expect("if_nametoindex");
+            assert_eq!(
+                pktinfo.ipi_ifindex as libc::c_uint, i,
+                "unexpected ifindex (expected {}, got {})",
+                i, pktinfo.ipi_ifindex
+            );
+        }
+        assert!(cmsgs.next().is_none(), "unexpected additional control msg");
+        assert_eq!(msg.bytes, 8);
+        assert_eq!(*iovec[0], [1u8, 2, 3, 4, 5, 6, 7, 8]);
+    }
+}
+
+#[cfg(any(
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+// qemu doesn't seem to be emulating this correctly in these architectures
+#[cfg_attr(
+    all(
+        qemu,
+        any(
+            target_arch = "mips",
+            target_arch = "mips64",
+            target_arch = "powerpc64",
+        )
+    ),
+    ignore
+)]
+#[test]
+pub fn test_recvif() {
+    use nix::net::if_::*;
+    use nix::sys::socket::sockopt::{Ipv4RecvDstAddr, Ipv4RecvIf};
+    use nix::sys::socket::{bind, SockFlag, SockType, SockaddrIn};
+    use nix::sys::socket::{getsockname, setsockopt, socket};
+    use nix::sys::socket::{recvmsg, sendmsg, ControlMessageOwned, MsgFlags};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let lo_ifaddr = loopback_address(AddressFamily::Inet);
+    let (lo_name, lo) = match lo_ifaddr {
+        Some(ifaddr) => (
+            ifaddr.interface_name,
+            ifaddr.address.expect("Expect IPv4 address on interface"),
+        ),
+        None => return,
+    };
+    let receive = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("receive socket failed");
+    bind(receive.as_raw_fd(), &lo).expect("bind failed");
+    let sa: SockaddrIn =
+        getsockname(receive.as_raw_fd()).expect("getsockname failed");
+    setsockopt(&receive, Ipv4RecvIf, &true)
+        .expect("setsockopt IP_RECVIF failed");
+    setsockopt(&receive, Ipv4RecvDstAddr, &true)
+        .expect("setsockopt IP_RECVDSTADDR failed");
+
+    {
+        let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+        let iov = [IoSlice::new(&slice)];
+
+        let send = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+        sendmsg(send.as_raw_fd(), &iov, &[], MsgFlags::empty(), Some(&sa))
+            .expect("sendmsg failed");
+    }
+
+    {
+        let mut buf = [0u8; 8];
+        let mut iovec = [IoSliceMut::new(&mut buf)];
+        let mut space = cmsg_space!(libc::sockaddr_dl, libc::in_addr);
+        let msg = recvmsg::<()>(
+            receive.as_raw_fd(),
+            &mut iovec,
+            Some(&mut space),
+            MsgFlags::empty(),
+        )
+        .expect("recvmsg failed");
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+        assert_eq!(msg.cmsgs().count(), 2, "expected 2 cmsgs");
+
+        let mut rx_recvif = false;
+        let mut rx_recvdstaddr = false;
+        for cmsg in msg.cmsgs() {
+            match cmsg {
+                ControlMessageOwned::Ipv4RecvIf(dl) => {
+                    rx_recvif = true;
+                    let i = if_nametoindex(lo_name.as_bytes())
+                        .expect("if_nametoindex");
+                    assert_eq!(
+                        dl.sdl_index as libc::c_uint, i,
+                        "unexpected ifindex (expected {}, got {})",
+                        i, dl.sdl_index
+                    );
+                }
+                ControlMessageOwned::Ipv4RecvDstAddr(addr) => {
+                    rx_recvdstaddr = true;
+                    if let Some(sin) = lo.as_sockaddr_in() {
+                        assert_eq!(sin.as_ref().sin_addr.s_addr,
+                                   addr.s_addr,
+                                   "unexpected destination address (expected {}, got {})",
+                                   sin.as_ref().sin_addr.s_addr,
+                                   addr.s_addr);
+                    } else {
+                        panic!("unexpected Sockaddr");
+                    }
+                }
+                _ => panic!("unexpected additional control msg"),
+            }
+        }
+        assert!(rx_recvif);
+        assert!(rx_recvdstaddr);
+        assert_eq!(msg.bytes, 8);
+        assert_eq!(*iovec[0], [1u8, 2, 3, 4, 5, 6, 7, 8]);
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "freebsd", target_os = "linux"))]
+#[cfg_attr(qemu, ignore)]
+#[test]
+pub fn test_recvif_ipv4() {
+    use nix::sys::socket::sockopt::Ipv4OrigDstAddr;
+    use nix::sys::socket::{bind, SockFlag, SockType, SockaddrIn};
+    use nix::sys::socket::{getsockname, setsockopt, socket};
+    use nix::sys::socket::{recvmsg, sendmsg, ControlMessageOwned, MsgFlags};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let lo_ifaddr = loopback_address(AddressFamily::Inet);
+    let (_lo_name, lo) = match lo_ifaddr {
+        Some(ifaddr) => (
+            ifaddr.interface_name,
+            ifaddr.address.expect("Expect IPv4 address on interface"),
+        ),
+        None => return,
+    };
+    let receive = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("receive socket failed");
+    bind(receive.as_raw_fd(), &lo).expect("bind failed");
+    let sa: SockaddrIn =
+        getsockname(receive.as_raw_fd()).expect("getsockname failed");
+    setsockopt(&receive, Ipv4OrigDstAddr, &true)
+        .expect("setsockopt IP_ORIGDSTADDR failed");
+
+    {
+        let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+        let iov = [IoSlice::new(&slice)];
+
+        let send = socket(
+            AddressFamily::Inet,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+        sendmsg(send.as_raw_fd(), &iov, &[], MsgFlags::empty(), Some(&sa))
+            .expect("sendmsg failed");
+    }
+
+    {
+        let mut buf = [0u8; 8];
+        let mut iovec = [IoSliceMut::new(&mut buf)];
+        let mut space = cmsg_space!(libc::sockaddr_in);
+        let msg = recvmsg::<()>(
+            receive.as_raw_fd(),
+            &mut iovec,
+            Some(&mut space),
+            MsgFlags::empty(),
+        )
+        .expect("recvmsg failed");
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+        assert_eq!(msg.cmsgs().count(), 1, "expected 1 cmsgs");
+
+        let mut rx_recvorigdstaddr = false;
+        for cmsg in msg.cmsgs() {
+            match cmsg {
+                ControlMessageOwned::Ipv4OrigDstAddr(addr) => {
+                    rx_recvorigdstaddr = true;
+                    if let Some(sin) = lo.as_sockaddr_in() {
+                        assert_eq!(sin.as_ref().sin_addr.s_addr,
+                                   addr.sin_addr.s_addr,
+                                   "unexpected destination address (expected {}, got {})",
+                                   sin.as_ref().sin_addr.s_addr,
+                                   addr.sin_addr.s_addr);
+                    } else {
+                        panic!("unexpected Sockaddr");
+                    }
+                }
+                _ => panic!("unexpected additional control msg"),
+            }
+        }
+        assert!(rx_recvorigdstaddr);
+        assert_eq!(msg.bytes, 8);
+        assert_eq!(*iovec[0], [1u8, 2, 3, 4, 5, 6, 7, 8]);
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "freebsd", target_os = "linux"))]
+#[cfg_attr(qemu, ignore)]
+#[test]
+pub fn test_recvif_ipv6() {
+    use nix::sys::socket::sockopt::Ipv6OrigDstAddr;
+    use nix::sys::socket::{bind, SockFlag, SockType, SockaddrIn6};
+    use nix::sys::socket::{getsockname, setsockopt, socket};
+    use nix::sys::socket::{recvmsg, sendmsg, ControlMessageOwned, MsgFlags};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let lo_ifaddr = loopback_address(AddressFamily::Inet6);
+    let (_lo_name, lo) = match lo_ifaddr {
+        Some(ifaddr) => (
+            ifaddr.interface_name,
+            ifaddr.address.expect("Expect IPv6 address on interface"),
+        ),
+        None => return,
+    };
+    let receive = socket(
+        AddressFamily::Inet6,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("receive socket failed");
+    bind(receive.as_raw_fd(), &lo).expect("bind failed");
+    let sa: SockaddrIn6 =
+        getsockname(receive.as_raw_fd()).expect("getsockname failed");
+    setsockopt(&receive, Ipv6OrigDstAddr, &true)
+        .expect("setsockopt IP_ORIGDSTADDR failed");
+
+    {
+        let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+        let iov = [IoSlice::new(&slice)];
+
+        let send = socket(
+            AddressFamily::Inet6,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+        sendmsg(send.as_raw_fd(), &iov, &[], MsgFlags::empty(), Some(&sa))
+            .expect("sendmsg failed");
+    }
+
+    {
+        let mut buf = [0u8; 8];
+        let mut iovec = [IoSliceMut::new(&mut buf)];
+        let mut space = cmsg_space!(libc::sockaddr_in6);
+        let msg = recvmsg::<()>(
+            receive.as_raw_fd(),
+            &mut iovec,
+            Some(&mut space),
+            MsgFlags::empty(),
+        )
+        .expect("recvmsg failed");
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+        assert_eq!(msg.cmsgs().count(), 1, "expected 1 cmsgs");
+
+        let mut rx_recvorigdstaddr = false;
+        for cmsg in msg.cmsgs() {
+            match cmsg {
+                ControlMessageOwned::Ipv6OrigDstAddr(addr) => {
+                    rx_recvorigdstaddr = true;
+                    if let Some(sin) = lo.as_sockaddr_in6() {
+                        assert_eq!(sin.as_ref().sin6_addr.s6_addr,
+                                   addr.sin6_addr.s6_addr,
+                                   "unexpected destination address (expected {:?}, got {:?})",
+                                   sin.as_ref().sin6_addr.s6_addr,
+                                   addr.sin6_addr.s6_addr);
+                    } else {
+                        panic!("unexpected Sockaddr");
+                    }
+                }
+                _ => panic!("unexpected additional control msg"),
+            }
+        }
+        assert!(rx_recvorigdstaddr);
+        assert_eq!(msg.bytes, 8);
+        assert_eq!(*iovec[0], [1u8, 2, 3, 4, 5, 6, 7, 8]);
+    }
+}
+
+#[cfg(any(
+    target_os = "android",
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+// qemu doesn't seem to be emulating this correctly in these architectures
+#[cfg_attr(
+    all(
+        qemu,
+        any(
+            target_arch = "mips",
+            target_arch = "mips64",
+            target_arch = "powerpc64",
+        )
+    ),
+    ignore
+)]
+#[test]
+pub fn test_recv_ipv6pktinfo() {
+    use nix::net::if_::*;
+    use nix::sys::socket::sockopt::Ipv6RecvPacketInfo;
+    use nix::sys::socket::{bind, SockFlag, SockType, SockaddrIn6};
+    use nix::sys::socket::{getsockname, setsockopt, socket};
+    use nix::sys::socket::{recvmsg, sendmsg, ControlMessageOwned, MsgFlags};
+    use std::io::{IoSlice, IoSliceMut};
+
+    let lo_ifaddr = loopback_address(AddressFamily::Inet6);
+    let (lo_name, lo) = match lo_ifaddr {
+        Some(ifaddr) => (
+            ifaddr.interface_name,
+            ifaddr.address.expect("Expect IPv6 address on interface"),
+        ),
+        None => return,
+    };
+    let receive = socket(
+        AddressFamily::Inet6,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("receive socket failed");
+    bind(receive.as_raw_fd(), &lo).expect("bind failed");
+    let sa: SockaddrIn6 =
+        getsockname(receive.as_raw_fd()).expect("getsockname failed");
+    setsockopt(&receive, Ipv6RecvPacketInfo, &true).expect("setsockopt failed");
+
+    {
+        let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
+        let iov = [IoSlice::new(&slice)];
+
+        let send = socket(
+            AddressFamily::Inet6,
+            SockType::Datagram,
+            SockFlag::empty(),
+            None,
+        )
+        .expect("send socket failed");
+        sendmsg(send.as_raw_fd(), &iov, &[], MsgFlags::empty(), Some(&sa))
+            .expect("sendmsg failed");
+    }
+
+    {
+        let mut buf = [0u8; 8];
+        let mut iovec = [IoSliceMut::new(&mut buf)];
+
+        let mut space = cmsg_space!(libc::in6_pktinfo);
+        let msg = recvmsg::<()>(
+            receive.as_raw_fd(),
+            &mut iovec,
+            Some(&mut space),
+            MsgFlags::empty(),
+        )
+        .expect("recvmsg failed");
+        assert!(!msg
+            .flags
+            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
+
+        let mut cmsgs = msg.cmsgs();
+        if let Some(ControlMessageOwned::Ipv6PacketInfo(pktinfo)) = cmsgs.next()
+        {
+            let i = if_nametoindex(lo_name.as_bytes()).expect("if_nametoindex");
+            assert_eq!(
+                pktinfo.ipi6_ifindex as libc::c_uint, i,
+                "unexpected ifindex (expected {}, got {})",
+                i, pktinfo.ipi6_ifindex
+            );
+        }
+        assert!(cmsgs.next().is_none(), "unexpected additional control msg");
+        assert_eq!(msg.bytes, 8);
+        assert_eq!(*iovec[0], [1u8, 2, 3, 4, 5, 6, 7, 8]);
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[test]
+pub fn test_vsock() {
+    use nix::sys::socket::SockaddrLike;
+    use nix::sys::socket::{AddressFamily, VsockAddr};
+    use std::mem;
+
+    let port: u32 = 3000;
+
+    let addr_local = VsockAddr::new(libc::VMADDR_CID_LOCAL, port);
+    assert_eq!(addr_local.cid(), libc::VMADDR_CID_LOCAL);
+    assert_eq!(addr_local.port(), port);
+
+    let addr_any = VsockAddr::new(libc::VMADDR_CID_ANY, libc::VMADDR_PORT_ANY);
+    assert_eq!(addr_any.cid(), libc::VMADDR_CID_ANY);
+    assert_eq!(addr_any.port(), libc::VMADDR_PORT_ANY);
+
+    assert_ne!(addr_local, addr_any);
+    assert_ne!(calculate_hash(&addr_local), calculate_hash(&addr_any));
+
+    let addr1 = VsockAddr::new(libc::VMADDR_CID_HOST, port);
+    let addr2 = VsockAddr::new(libc::VMADDR_CID_HOST, port);
+    assert_eq!(addr1, addr2);
+    assert_eq!(calculate_hash(&addr1), calculate_hash(&addr2));
+
+    let addr3 = unsafe {
+        VsockAddr::from_raw(
+            addr2.as_ref() as *const libc::sockaddr_vm as *const libc::sockaddr,
+            Some(mem::size_of::<libc::sockaddr_vm>().try_into().unwrap()),
+        )
+    }
+    .unwrap();
+    assert_eq!(
+        addr3.as_ref().svm_family,
+        AddressFamily::Vsock as libc::sa_family_t
+    );
+    assert_eq!(addr3.as_ref().svm_cid, addr1.cid());
+    assert_eq!(addr3.as_ref().svm_port, addr1.port());
+}
+
+#[cfg(target_os = "macos")]
+#[test]
+pub fn test_vsock() {
+    use nix::sys::socket::SockaddrLike;
+    use nix::sys::socket::{AddressFamily, VsockAddr};
+    use std::mem;
+
+    let port: u32 = 3000;
+
+    // macOS doesn't have a VMADDR_CID_LOCAL, so test with host again
+    let addr_host = VsockAddr::new(libc::VMADDR_CID_HOST, port);
+    assert_eq!(addr_host.cid(), libc::VMADDR_CID_HOST);
+    assert_eq!(addr_host.port(), port);
+
+    let addr_any = VsockAddr::new(libc::VMADDR_CID_ANY, libc::VMADDR_PORT_ANY);
+    assert_eq!(addr_any.cid(), libc::VMADDR_CID_ANY);
+    assert_eq!(addr_any.port(), libc::VMADDR_PORT_ANY);
+
+    assert_ne!(addr_host, addr_any);
+    assert_ne!(calculate_hash(&addr_host), calculate_hash(&addr_any));
+
+    let addr1 = VsockAddr::new(libc::VMADDR_CID_HOST, port);
+    let addr2 = VsockAddr::new(libc::VMADDR_CID_HOST, port);
+    assert_eq!(addr1, addr2);
+    assert_eq!(calculate_hash(&addr1), calculate_hash(&addr2));
+
+    let addr3 = unsafe {
+        VsockAddr::from_raw(
+            addr2.as_ref() as *const libc::sockaddr_vm as *const libc::sockaddr,
+            Some(mem::size_of::<libc::sockaddr_vm>().try_into().unwrap()),
+        )
+    }
+    .unwrap();
+    assert_eq!(
+        addr3.as_ref().svm_family,
+        AddressFamily::Vsock as libc::sa_family_t
+    );
+    let cid = addr3.as_ref().svm_cid;
+    let port = addr3.as_ref().svm_port;
+    assert_eq!(cid, addr1.cid());
+    assert_eq!(port, addr1.port());
+}
+
+// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
+#[cfg(target_os = "linux")]
+#[test]
+fn test_recvmsg_timestampns() {
+    use nix::sys::socket::*;
+    use nix::sys::time::*;
+    use std::io::{IoSlice, IoSliceMut};
+    use std::time::*;
+
+    // Set up
+    let message = "Ohayō!".as_bytes();
+    let in_socket = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    setsockopt(&in_socket, sockopt::ReceiveTimestampns, &true).unwrap();
+    let localhost = SockaddrIn::new(127, 0, 0, 1, 0);
+    bind(in_socket.as_raw_fd(), &localhost).unwrap();
+    let address: SockaddrIn = getsockname(in_socket.as_raw_fd()).unwrap();
+    // Get initial time
+    let time0 = SystemTime::now();
+    // Send the message
+    let iov = [IoSlice::new(message)];
+    let flags = MsgFlags::empty();
+    let l = sendmsg(in_socket.as_raw_fd(), &iov, &[], flags, Some(&address))
+        .unwrap();
+    assert_eq!(message.len(), l);
+    // Receive the message
+    let mut buffer = vec![0u8; message.len()];
+    let mut cmsgspace = nix::cmsg_space!(TimeSpec);
+
+    let mut iov = [IoSliceMut::new(&mut buffer)];
+    let r = recvmsg::<()>(
+        in_socket.as_raw_fd(),
+        &mut iov,
+        Some(&mut cmsgspace),
+        flags,
+    )
+    .unwrap();
+    let rtime = match r.cmsgs().next() {
+        Some(ControlMessageOwned::ScmTimestampns(rtime)) => rtime,
+        Some(_) => panic!("Unexpected control message"),
+        None => panic!("No control message"),
+    };
+    // Check the final time
+    let time1 = SystemTime::now();
+    // the packet's received timestamp should lie in-between the two system
+    // times, unless the system clock was adjusted in the meantime.
+    let rduration =
+        Duration::new(rtime.tv_sec() as u64, rtime.tv_nsec() as u32);
+    assert!(time0.duration_since(UNIX_EPOCH).unwrap() <= rduration);
+    assert!(rduration <= time1.duration_since(UNIX_EPOCH).unwrap());
+}
+
+// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
+#[cfg(target_os = "linux")]
+#[test]
+fn test_recvmmsg_timestampns() {
+    use nix::sys::socket::*;
+    use nix::sys::time::*;
+    use std::io::{IoSlice, IoSliceMut};
+    use std::time::*;
+
+    // Set up
+    let message = "Ohayō!".as_bytes();
+    let in_socket = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    setsockopt(&in_socket, sockopt::ReceiveTimestampns, &true).unwrap();
+    let localhost = SockaddrIn::from_str("127.0.0.1:0").unwrap();
+    bind(in_socket.as_raw_fd(), &localhost).unwrap();
+    let address: SockaddrIn = getsockname(in_socket.as_raw_fd()).unwrap();
+    // Get initial time
+    let time0 = SystemTime::now();
+    // Send the message
+    let iov = [IoSlice::new(message)];
+    let flags = MsgFlags::empty();
+    let l = sendmsg(in_socket.as_raw_fd(), &iov, &[], flags, Some(&address))
+        .unwrap();
+    assert_eq!(message.len(), l);
+    // Receive the message
+    let mut buffer = vec![0u8; message.len()];
+    let cmsgspace = nix::cmsg_space!(TimeSpec);
+    let iov = vec![[IoSliceMut::new(&mut buffer)]];
+    let mut data = MultiHeaders::preallocate(1, Some(cmsgspace));
+    let r: Vec<RecvMsg<()>> =
+        recvmmsg(in_socket.as_raw_fd(), &mut data, iov.iter(), flags, None)
+            .unwrap()
+            .collect();
+    let rtime = match r[0].cmsgs().next() {
+        Some(ControlMessageOwned::ScmTimestampns(rtime)) => rtime,
+        Some(_) => panic!("Unexpected control message"),
+        None => panic!("No control message"),
+    };
+    // Check the final time
+    let time1 = SystemTime::now();
+    // the packet's received timestamp should lie in-between the two system
+    // times, unless the system clock was adjusted in the meantime.
+    let rduration =
+        Duration::new(rtime.tv_sec() as u64, rtime.tv_nsec() as u32);
+    assert!(time0.duration_since(UNIX_EPOCH).unwrap() <= rduration);
+    assert!(rduration <= time1.duration_since(UNIX_EPOCH).unwrap());
+}
+
+// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
+#[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))]
+#[test]
+fn test_recvmsg_rxq_ovfl() {
+    use nix::sys::socket::sockopt::{RcvBuf, RxqOvfl};
+    use nix::sys::socket::*;
+    use nix::Error;
+    use std::io::{IoSlice, IoSliceMut};
+
+    let message = [0u8; 2048];
+    let bufsize = message.len() * 2;
+
+    let in_socket = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    let out_socket = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+
+    let localhost = SockaddrIn::from_str("127.0.0.1:0").unwrap();
+    bind(in_socket.as_raw_fd(), &localhost).unwrap();
+
+    let address: SockaddrIn = getsockname(in_socket.as_raw_fd()).unwrap();
+    connect(out_socket.as_raw_fd(), &address).unwrap();
+
+    // Set SO_RXQ_OVFL flag.
+    setsockopt(&in_socket, RxqOvfl, &1).unwrap();
+
+    // Set the receiver buffer size to hold only 2 messages.
+    setsockopt(&in_socket, RcvBuf, &bufsize).unwrap();
+
+    let mut drop_counter = 0;
+
+    for _ in 0..2 {
+        let iov = [IoSlice::new(&message)];
+        let flags = MsgFlags::empty();
+
+        // Send the 3 messages (the receiver buffer can only hold 2 messages)
+        // to create an overflow.
+        for _ in 0..3 {
+            let l = sendmsg(
+                out_socket.as_raw_fd(),
+                &iov,
+                &[],
+                flags,
+                Some(&address),
+            )
+            .unwrap();
+            assert_eq!(message.len(), l);
+        }
+
+        // Receive the message and check the drop counter if any.
+        loop {
+            let mut buffer = vec![0u8; message.len()];
+            let mut cmsgspace = nix::cmsg_space!(u32);
+
+            let mut iov = [IoSliceMut::new(&mut buffer)];
+
+            match recvmsg::<()>(
+                in_socket.as_raw_fd(),
+                &mut iov,
+                Some(&mut cmsgspace),
+                MsgFlags::MSG_DONTWAIT,
+            ) {
+                Ok(r) => {
+                    drop_counter = match r.cmsgs().next() {
+                        Some(ControlMessageOwned::RxqOvfl(drop_counter)) => {
+                            drop_counter
+                        }
+                        Some(_) => panic!("Unexpected control message"),
+                        None => 0,
+                    };
+                }
+                Err(Error::EAGAIN) => {
+                    break;
+                }
+                _ => {
+                    panic!("unknown recvmsg() error");
+                }
+            }
+        }
+    }
+
+    // One packet lost.
+    assert_eq!(drop_counter, 1);
+}
+
+#[cfg(any(target_os = "linux", target_os = "android",))]
+mod linux_errqueue {
+    use super::FromStr;
+    use nix::sys::socket::*;
+    use std::os::unix::io::AsRawFd;
+
+    // Send a UDP datagram to a bogus destination address and observe an ICMP error (v4).
+    //
+    // Disable the test on QEMU because QEMU emulation of IP_RECVERR is broken (as documented on PR
+    // #1514).
+    #[cfg_attr(qemu, ignore)]
+    #[test]
+    fn test_recverr_v4() {
+        #[repr(u8)]
+        enum IcmpTypes {
+            DestUnreach = 3, // ICMP_DEST_UNREACH
+        }
+        #[repr(u8)]
+        enum IcmpUnreachCodes {
+            PortUnreach = 3, // ICMP_PORT_UNREACH
+        }
+
+        test_recverr_impl::<sockaddr_in, _, _>(
+            "127.0.0.1:6800",
+            AddressFamily::Inet,
+            sockopt::Ipv4RecvErr,
+            libc::SO_EE_ORIGIN_ICMP,
+            IcmpTypes::DestUnreach as u8,
+            IcmpUnreachCodes::PortUnreach as u8,
+            // Closure handles protocol-specific testing and returns generic sock_extended_err for
+            // protocol-independent test impl.
+            |cmsg| {
+                if let ControlMessageOwned::Ipv4RecvErr(ext_err, err_addr) =
+                    cmsg
+                {
+                    if let Some(origin) = err_addr {
+                        // Validate that our network error originated from 127.0.0.1:0.
+                        assert_eq!(origin.sin_family, AddressFamily::Inet as _);
+                        assert_eq!(
+                            origin.sin_addr.s_addr,
+                            u32::from_be(0x7f000001)
+                        );
+                        assert_eq!(origin.sin_port, 0);
+                    } else {
+                        panic!("Expected some error origin");
+                    }
+                    *ext_err
+                } else {
+                    panic!("Unexpected control message {cmsg:?}");
+                }
+            },
+        )
+    }
+
+    // Essentially the same test as v4.
+    //
+    // Disable the test on QEMU because QEMU emulation of IPV6_RECVERR is broken (as documented on
+    // PR #1514).
+    #[cfg_attr(qemu, ignore)]
+    #[test]
+    fn test_recverr_v6() {
+        #[repr(u8)]
+        enum IcmpV6Types {
+            DestUnreach = 1, // ICMPV6_DEST_UNREACH
+        }
+        #[repr(u8)]
+        enum IcmpV6UnreachCodes {
+            PortUnreach = 4, // ICMPV6_PORT_UNREACH
+        }
+
+        test_recverr_impl::<sockaddr_in6, _, _>(
+            "[::1]:6801",
+            AddressFamily::Inet6,
+            sockopt::Ipv6RecvErr,
+            libc::SO_EE_ORIGIN_ICMP6,
+            IcmpV6Types::DestUnreach as u8,
+            IcmpV6UnreachCodes::PortUnreach as u8,
+            // Closure handles protocol-specific testing and returns generic sock_extended_err for
+            // protocol-independent test impl.
+            |cmsg| {
+                if let ControlMessageOwned::Ipv6RecvErr(ext_err, err_addr) =
+                    cmsg
+                {
+                    if let Some(origin) = err_addr {
+                        // Validate that our network error originated from localhost:0.
+                        assert_eq!(
+                            origin.sin6_family,
+                            AddressFamily::Inet6 as _
+                        );
+                        assert_eq!(
+                            origin.sin6_addr.s6_addr,
+                            std::net::Ipv6Addr::LOCALHOST.octets()
+                        );
+                        assert_eq!(origin.sin6_port, 0);
+                    } else {
+                        panic!("Expected some error origin");
+                    }
+                    *ext_err
+                } else {
+                    panic!("Unexpected control message {cmsg:?}");
+                }
+            },
+        )
+    }
+
+    fn test_recverr_impl<SA, OPT, TESTF>(
+        sa: &str,
+        af: AddressFamily,
+        opt: OPT,
+        ee_origin: u8,
+        ee_type: u8,
+        ee_code: u8,
+        testf: TESTF,
+    ) where
+        OPT: SetSockOpt<Val = bool>,
+        TESTF: FnOnce(&ControlMessageOwned) -> libc::sock_extended_err,
+    {
+        use nix::errno::Errno;
+        use std::io::IoSliceMut;
+
+        const MESSAGE_CONTENTS: &str = "ABCDEF";
+        let std_sa = std::net::SocketAddr::from_str(sa).unwrap();
+        let sock_addr = SockaddrStorage::from(std_sa);
+        let sock = socket(af, SockType::Datagram, SockFlag::SOCK_CLOEXEC, None)
+            .unwrap();
+        setsockopt(&sock, opt, &true).unwrap();
+        if let Err(e) = sendto(
+            sock.as_raw_fd(),
+            MESSAGE_CONTENTS.as_bytes(),
+            &sock_addr,
+            MsgFlags::empty(),
+        ) {
+            assert_eq!(e, Errno::EADDRNOTAVAIL);
+            println!("{af:?} not available, skipping test.");
+            return;
+        }
+
+        let mut buf = [0u8; 8];
+        let mut iovec = [IoSliceMut::new(&mut buf)];
+        let mut cspace = cmsg_space!(libc::sock_extended_err, SA);
+
+        let msg = recvmsg(
+            sock.as_raw_fd(),
+            &mut iovec,
+            Some(&mut cspace),
+            MsgFlags::MSG_ERRQUEUE,
+        )
+        .unwrap();
+        // The sent message / destination associated with the error is returned:
+        assert_eq!(msg.bytes, MESSAGE_CONTENTS.as_bytes().len());
+        // recvmsg(2): "The original destination address of the datagram that caused the error is
+        // supplied via msg_name;" however, this is not literally true.  E.g., an earlier version
+        // of this test used 0.0.0.0 (::0) as the destination address, which was mutated into
+        // 127.0.0.1 (::1).
+        assert_eq!(msg.address, Some(sock_addr));
+
+        // Check for expected control message.
+        let ext_err = match msg.cmsgs().next() {
+            Some(cmsg) => testf(&cmsg),
+            None => panic!("No control message"),
+        };
+
+        assert_eq!(ext_err.ee_errno, libc::ECONNREFUSED as u32);
+        assert_eq!(ext_err.ee_origin, ee_origin);
+        // ip(7): ee_type and ee_code are set from the type and code fields of the ICMP (ICMPv6)
+        // header.
+        assert_eq!(ext_err.ee_type, ee_type);
+        assert_eq!(ext_err.ee_code, ee_code);
+        // ip(7): ee_info contains the discovered MTU for EMSGSIZE errors.
+        assert_eq!(ext_err.ee_info, 0);
+
+        let bytes = msg.bytes;
+        assert_eq!(&buf[..bytes], MESSAGE_CONTENTS.as_bytes());
+    }
+}
+
+// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
+#[cfg(target_os = "linux")]
+#[test]
+pub fn test_txtime() {
+    use nix::sys::socket::{
+        bind, recvmsg, sendmsg, setsockopt, socket, sockopt, ControlMessage,
+        MsgFlags, SockFlag, SockType, SockaddrIn,
+    };
+    use nix::sys::time::TimeValLike;
+    use nix::time::{clock_gettime, ClockId};
+
+    require_kernel_version!(test_txtime, ">= 5.8");
+
+    let sock_addr = SockaddrIn::from_str("127.0.0.1:6802").unwrap();
+
+    let ssock = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .expect("send socket failed");
+
+    let txtime_cfg = libc::sock_txtime {
+        clockid: libc::CLOCK_MONOTONIC,
+        flags: 0,
+    };
+    setsockopt(&ssock, sockopt::TxTime, &txtime_cfg).unwrap();
+
+    let rsock = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+
+    let sbuf = [0u8; 2048];
+    let iov1 = [std::io::IoSlice::new(&sbuf)];
+
+    let now = clock_gettime(ClockId::CLOCK_MONOTONIC).unwrap();
+    let delay = std::time::Duration::from_secs(1).into();
+    let txtime = (now + delay).num_nanoseconds() as u64;
+
+    let cmsg = ControlMessage::TxTime(&txtime);
+    sendmsg(
+        ssock.as_raw_fd(),
+        &iov1,
+        &[cmsg],
+        MsgFlags::empty(),
+        Some(&sock_addr),
+    )
+    .unwrap();
+
+    let mut rbuf = [0u8; 2048];
+    let mut iov2 = [std::io::IoSliceMut::new(&mut rbuf)];
+    recvmsg::<()>(rsock.as_raw_fd(), &mut iov2, None, MsgFlags::empty())
+        .unwrap();
+}
diff --git a/vendor/nix/test/sys/test_sockopt.rs b/vendor/nix/test/sys/test_sockopt.rs
new file mode 100644
index 000000000..0e3491732
--- /dev/null
+++ b/vendor/nix/test/sys/test_sockopt.rs
@@ -0,0 +1,448 @@
+#[cfg(any(target_os = "android", target_os = "linux"))]
+use crate::*;
+use nix::sys::socket::{
+    getsockopt, setsockopt, socket, sockopt, AddressFamily, SockFlag,
+    SockProtocol, SockType,
+};
+use rand::{thread_rng, Rng};
+use std::os::unix::io::AsRawFd;
+
+// NB: FreeBSD supports LOCAL_PEERCRED for SOCK_SEQPACKET, but OSX does not.
+#[cfg(any(target_os = "dragonfly", target_os = "freebsd",))]
+#[test]
+pub fn test_local_peercred_seqpacket() {
+    use nix::{
+        sys::socket::socketpair,
+        unistd::{Gid, Uid},
+    };
+
+    let (fd1, _fd2) = socketpair(
+        AddressFamily::Unix,
+        SockType::SeqPacket,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+    let xucred = getsockopt(&fd1, sockopt::LocalPeerCred).unwrap();
+    assert_eq!(xucred.version(), 0);
+    assert_eq!(Uid::from_raw(xucred.uid()), Uid::current());
+    assert_eq!(Gid::from_raw(xucred.groups()[0]), Gid::current());
+}
+
+#[cfg(any(
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "macos",
+    target_os = "ios"
+))]
+#[test]
+pub fn test_local_peercred_stream() {
+    use nix::{
+        sys::socket::socketpair,
+        unistd::{Gid, Uid},
+    };
+
+    let (fd1, _fd2) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+    let xucred = getsockopt(&fd1, sockopt::LocalPeerCred).unwrap();
+    assert_eq!(xucred.version(), 0);
+    assert_eq!(Uid::from_raw(xucred.uid()), Uid::current());
+    assert_eq!(Gid::from_raw(xucred.groups()[0]), Gid::current());
+}
+
+#[cfg(any(target_os = "ios", target_os = "macos"))]
+#[test]
+pub fn test_local_peer_pid() {
+    use nix::sys::socket::socketpair;
+
+    let (fd1, _fd2) = socketpair(
+        AddressFamily::Unix,
+        SockType::Stream,
+        None,
+        SockFlag::empty(),
+    )
+    .unwrap();
+    let pid = getsockopt(&fd1, sockopt::LocalPeerPid).unwrap();
+    assert_eq!(pid, std::process::id() as _);
+}
+
+#[cfg(target_os = "linux")]
+#[test]
+fn is_so_mark_functional() {
+    use nix::sys::socket::sockopt;
+
+    require_capability!("is_so_mark_functional", CAP_NET_ADMIN);
+
+    let s = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    setsockopt(&s, sockopt::Mark, &1337).unwrap();
+    let mark = getsockopt(&s, sockopt::Mark).unwrap();
+    assert_eq!(mark, 1337);
+}
+
+#[test]
+fn test_so_buf() {
+    let fd = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        SockProtocol::Udp,
+    )
+    .unwrap();
+    let bufsize: usize = thread_rng().gen_range(4096..131_072);
+    setsockopt(&fd, sockopt::SndBuf, &bufsize).unwrap();
+    let actual = getsockopt(&fd, sockopt::SndBuf).unwrap();
+    assert!(actual >= bufsize);
+    setsockopt(&fd, sockopt::RcvBuf, &bufsize).unwrap();
+    let actual = getsockopt(&fd, sockopt::RcvBuf).unwrap();
+    assert!(actual >= bufsize);
+}
+
+#[test]
+fn test_so_tcp_maxseg() {
+    use nix::sys::socket::{accept, bind, connect, listen, SockaddrIn};
+    use nix::unistd::write;
+    use std::net::SocketAddrV4;
+    use std::str::FromStr;
+
+    let std_sa = SocketAddrV4::from_str("127.0.0.1:4001").unwrap();
+    let sock_addr = SockaddrIn::from(std_sa);
+
+    let rsock = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    bind(rsock.as_raw_fd(), &sock_addr).unwrap();
+    listen(&rsock, 10).unwrap();
+    let initial = getsockopt(&rsock, sockopt::TcpMaxSeg).unwrap();
+    // Initial MSS is expected to be 536 (https://tools.ietf.org/html/rfc879#section-1) but some
+    // platforms keep it even lower. This might fail if you've tuned your initial MSS to be larger
+    // than 700
+    cfg_if! {
+        if #[cfg(any(target_os = "android", target_os = "linux"))] {
+            let segsize: u32 = 873;
+            assert!(initial < segsize);
+            setsockopt(&rsock, sockopt::TcpMaxSeg, &segsize).unwrap();
+        } else {
+            assert!(initial < 700);
+        }
+    }
+
+    // Connect and check the MSS that was advertised
+    let ssock = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    connect(ssock.as_raw_fd(), &sock_addr).unwrap();
+    let rsess = accept(rsock.as_raw_fd()).unwrap();
+    write(rsess, b"hello").unwrap();
+    let actual = getsockopt(&ssock, sockopt::TcpMaxSeg).unwrap();
+    // Actual max segment size takes header lengths into account, max IPv4 options (60 bytes) + max
+    // TCP options (40 bytes) are subtracted from the requested maximum as a lower boundary.
+    cfg_if! {
+        if #[cfg(any(target_os = "android", target_os = "linux"))] {
+            assert!((segsize - 100) <= actual);
+            assert!(actual <= segsize);
+        } else {
+            assert!(initial < actual);
+            assert!(536 < actual);
+        }
+    }
+}
+
+#[test]
+fn test_so_type() {
+    let sockfd = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+
+    assert_eq!(Ok(SockType::Stream), getsockopt(&sockfd, sockopt::SockType));
+}
+
+/// getsockopt(_, sockopt::SockType) should gracefully handle unknown socket
+/// types.  Regression test for https://github.com/nix-rust/nix/issues/1819
+#[cfg(any(target_os = "android", target_os = "linux",))]
+#[test]
+fn test_so_type_unknown() {
+    use nix::errno::Errno;
+    use std::os::unix::io::{FromRawFd, OwnedFd};
+
+    require_capability!("test_so_type", CAP_NET_RAW);
+    let raw_fd = unsafe { libc::socket(libc::AF_PACKET, libc::SOCK_PACKET, 0) };
+    assert!(raw_fd >= 0, "Error opening socket: {}", nix::Error::last());
+    let sockfd = unsafe { OwnedFd::from_raw_fd(raw_fd) };
+
+    assert_eq!(Err(Errno::EINVAL), getsockopt(&sockfd, sockopt::SockType));
+}
+
+// The CI doesn't supported getsockopt and setsockopt on emulated processors.
+// It's believed that a QEMU issue, the tests run ok on a fully emulated system.
+// Current CI just run the binary with QEMU but the Kernel remains the same as the host.
+// So the syscall doesn't work properly unless the kernel is also emulated.
+#[test]
+#[cfg(all(
+    any(target_arch = "x86", target_arch = "x86_64"),
+    any(target_os = "freebsd", target_os = "linux")
+))]
+fn test_tcp_congestion() {
+    use std::ffi::OsString;
+
+    let fd = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+
+    let val = getsockopt(&fd, sockopt::TcpCongestion).unwrap();
+    setsockopt(&fd, sockopt::TcpCongestion, &val).unwrap();
+
+    setsockopt(
+        &fd,
+        sockopt::TcpCongestion,
+        &OsString::from("tcp_congestion_does_not_exist"),
+    )
+    .unwrap_err();
+
+    assert_eq!(getsockopt(&fd, sockopt::TcpCongestion).unwrap(), val);
+}
+
+#[test]
+#[cfg(any(target_os = "android", target_os = "linux"))]
+fn test_bindtodevice() {
+    skip_if_not_root!("test_bindtodevice");
+
+    let fd = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+
+    let val = getsockopt(&fd, sockopt::BindToDevice).unwrap();
+    setsockopt(&fd, sockopt::BindToDevice, &val).unwrap();
+
+    assert_eq!(getsockopt(&fd, sockopt::BindToDevice).unwrap(), val);
+}
+
+#[test]
+fn test_so_tcp_keepalive() {
+    let fd = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    setsockopt(&fd, sockopt::KeepAlive, &true).unwrap();
+    assert!(getsockopt(&fd, sockopt::KeepAlive).unwrap());
+
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "linux"
+    ))]
+    {
+        let x = getsockopt(&fd, sockopt::TcpKeepIdle).unwrap();
+        setsockopt(&fd, sockopt::TcpKeepIdle, &(x + 1)).unwrap();
+        assert_eq!(getsockopt(&fd, sockopt::TcpKeepIdle).unwrap(), x + 1);
+
+        let x = getsockopt(&fd, sockopt::TcpKeepCount).unwrap();
+        setsockopt(&fd, sockopt::TcpKeepCount, &(x + 1)).unwrap();
+        assert_eq!(getsockopt(&fd, sockopt::TcpKeepCount).unwrap(), x + 1);
+
+        let x = getsockopt(&fd, sockopt::TcpKeepInterval).unwrap();
+        setsockopt(&fd, sockopt::TcpKeepInterval, &(x + 1)).unwrap();
+        assert_eq!(getsockopt(&fd, sockopt::TcpKeepInterval).unwrap(), x + 1);
+    }
+}
+
+#[test]
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg_attr(qemu, ignore)]
+fn test_get_mtu() {
+    use nix::sys::socket::{bind, connect, SockaddrIn};
+    use std::net::SocketAddrV4;
+    use std::str::FromStr;
+
+    let std_sa = SocketAddrV4::from_str("127.0.0.1:4001").unwrap();
+    let std_sb = SocketAddrV4::from_str("127.0.0.1:4002").unwrap();
+
+    let usock = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        SockProtocol::Udp,
+    )
+    .unwrap();
+
+    // Bind and initiate connection
+    bind(usock.as_raw_fd(), &SockaddrIn::from(std_sa)).unwrap();
+    connect(usock.as_raw_fd(), &SockaddrIn::from(std_sb)).unwrap();
+
+    // Loopback connections have 2^16 - the maximum - MTU
+    assert_eq!(getsockopt(&usock, sockopt::IpMtu), Ok(u16::MAX as i32))
+}
+
+#[test]
+#[cfg(any(target_os = "android", target_os = "freebsd", target_os = "linux"))]
+fn test_ttl_opts() {
+    let fd4 = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    setsockopt(&fd4, sockopt::Ipv4Ttl, &1)
+        .expect("setting ipv4ttl on an inet socket should succeed");
+    let fd6 = socket(
+        AddressFamily::Inet6,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    setsockopt(&fd6, sockopt::Ipv6Ttl, &1)
+        .expect("setting ipv6ttl on an inet6 socket should succeed");
+}
+
+#[test]
+#[cfg(any(target_os = "ios", target_os = "macos"))]
+fn test_dontfrag_opts() {
+    let fd4 = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    setsockopt(&fd4, sockopt::IpDontFrag, &true)
+        .expect("setting IP_DONTFRAG on an inet stream socket should succeed");
+    setsockopt(&fd4, sockopt::IpDontFrag, &false).expect(
+        "unsetting IP_DONTFRAG on an inet stream socket should succeed",
+    );
+    let fd4d = socket(
+        AddressFamily::Inet,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    setsockopt(&fd4d, sockopt::IpDontFrag, &true).expect(
+        "setting IP_DONTFRAG on an inet datagram socket should succeed",
+    );
+    setsockopt(&fd4d, sockopt::IpDontFrag, &false).expect(
+        "unsetting IP_DONTFRAG on an inet datagram socket should succeed",
+    );
+}
+
+#[test]
+#[cfg(any(
+    target_os = "android",
+    target_os = "ios",
+    target_os = "linux",
+    target_os = "macos",
+))]
+// Disable the test under emulation because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
+fn test_v6dontfrag_opts() {
+    let fd6 = socket(
+        AddressFamily::Inet6,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    setsockopt(&fd6, sockopt::Ipv6DontFrag, &true).expect(
+        "setting IPV6_DONTFRAG on an inet6 stream socket should succeed",
+    );
+    setsockopt(&fd6, sockopt::Ipv6DontFrag, &false).expect(
+        "unsetting IPV6_DONTFRAG on an inet6 stream socket should succeed",
+    );
+    let fd6d = socket(
+        AddressFamily::Inet6,
+        SockType::Datagram,
+        SockFlag::empty(),
+        None,
+    )
+    .unwrap();
+    setsockopt(&fd6d, sockopt::Ipv6DontFrag, &true).expect(
+        "setting IPV6_DONTFRAG on an inet6 datagram socket should succeed",
+    );
+    setsockopt(&fd6d, sockopt::Ipv6DontFrag, &false).expect(
+        "unsetting IPV6_DONTFRAG on an inet6 datagram socket should succeed",
+    );
+}
+
+#[test]
+#[cfg(target_os = "linux")]
+fn test_so_priority() {
+    let fd = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    let priority = 3;
+    setsockopt(&fd, sockopt::Priority, &priority).unwrap();
+    assert_eq!(getsockopt(&fd, sockopt::Priority).unwrap(), priority);
+}
+
+#[test]
+#[cfg(target_os = "linux")]
+fn test_ip_tos() {
+    let fd = socket(
+        AddressFamily::Inet,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    let tos = 0x80; // CS4
+    setsockopt(&fd, sockopt::IpTos, &tos).unwrap();
+    assert_eq!(getsockopt(&fd, sockopt::IpTos).unwrap(), tos);
+}
+
+#[test]
+#[cfg(target_os = "linux")]
+// Disable the test under emulation because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
+fn test_ipv6_tclass() {
+    let fd = socket(
+        AddressFamily::Inet6,
+        SockType::Stream,
+        SockFlag::empty(),
+        SockProtocol::Tcp,
+    )
+    .unwrap();
+    let class = 0x80; // CS4
+    setsockopt(&fd, sockopt::Ipv6TClass, &class).unwrap();
+    assert_eq!(getsockopt(&fd, sockopt::Ipv6TClass).unwrap(), class);
+}
diff --git a/vendor/nix/test/sys/test_stat.rs b/vendor/nix/test/sys/test_stat.rs
new file mode 100644
index 000000000..426b4b658
--- /dev/null
+++ b/vendor/nix/test/sys/test_stat.rs
@@ -0,0 +1,29 @@
+// The conversion is not useless on all platforms.
+#[allow(clippy::useless_conversion)]
+#[cfg(target_os = "freebsd")]
+#[test]
+fn test_chflags() {
+    use nix::{
+        sys::stat::{fstat, FileFlag},
+        unistd::chflags,
+    };
+    use std::os::unix::io::AsRawFd;
+    use tempfile::NamedTempFile;
+
+    let f = NamedTempFile::new().unwrap();
+
+    let initial = FileFlag::from_bits_truncate(
+        fstat(f.as_raw_fd()).unwrap().st_flags.into(),
+    );
+    // UF_OFFLINE is preserved by all FreeBSD file systems, but not interpreted
+    // in any way, so it's handy for testing.
+    let commanded = initial ^ FileFlag::UF_OFFLINE;
+
+    chflags(f.path(), commanded).unwrap();
+
+    let changed = FileFlag::from_bits_truncate(
+        fstat(f.as_raw_fd()).unwrap().st_flags.into(),
+    );
+
+    assert_eq!(commanded, changed);
+}
diff --git a/vendor/nix/test/sys/test_sysinfo.rs b/vendor/nix/test/sys/test_sysinfo.rs
new file mode 100644
index 000000000..2897366ef
--- /dev/null
+++ b/vendor/nix/test/sys/test_sysinfo.rs
@@ -0,0 +1,20 @@
+use nix::sys::sysinfo::*;
+
+#[test]
+fn sysinfo_works() {
+    let info = sysinfo().unwrap();
+
+    let (l1, l5, l15) = info.load_average();
+    assert!(l1 >= 0.0);
+    assert!(l5 >= 0.0);
+    assert!(l15 >= 0.0);
+
+    info.uptime(); // just test Duration construction
+
+    assert!(
+        info.swap_free() <= info.swap_total(),
+        "more swap available than installed (free: {}, total: {})",
+        info.swap_free(),
+        info.swap_total()
+    );
+}
diff --git a/vendor/nix/test/sys/test_termios.rs b/vendor/nix/test/sys/test_termios.rs
new file mode 100644
index 000000000..83919378a
--- /dev/null
+++ b/vendor/nix/test/sys/test_termios.rs
@@ -0,0 +1,107 @@
+use std::os::unix::io::{AsFd, AsRawFd};
+use tempfile::tempfile;
+
+use nix::errno::Errno;
+use nix::fcntl;
+use nix::pty::openpty;
+use nix::sys::termios::{self, tcgetattr, LocalFlags, OutputFlags};
+use nix::unistd::{read, write};
+
+/// Helper function analogous to `std::io::Write::write_all`, but for `Fd`s
+fn write_all<Fd: AsFd>(f: Fd, buf: &[u8]) {
+    let mut len = 0;
+    while len < buf.len() {
+        len += write(f.as_fd().as_raw_fd(), &buf[len..]).unwrap();
+    }
+}
+
+// Test tcgetattr on a terminal
+#[test]
+fn test_tcgetattr_pty() {
+    // openpty uses ptname(3) internally
+    let _m = crate::PTSNAME_MTX.lock();
+
+    let pty = openpty(None, None).expect("openpty failed");
+    termios::tcgetattr(&pty.slave).unwrap();
+}
+
+// Test tcgetattr on something that isn't a terminal
+#[test]
+fn test_tcgetattr_enotty() {
+    let file = tempfile().unwrap();
+    assert_eq!(termios::tcgetattr(&file).err(), Some(Errno::ENOTTY));
+}
+
+// Test modifying output flags
+#[test]
+fn test_output_flags() {
+    // openpty uses ptname(3) internally
+    let _m = crate::PTSNAME_MTX.lock();
+
+    // Open one pty to get attributes for the second one
+    let mut termios = {
+        let pty = openpty(None, None).expect("openpty failed");
+        tcgetattr(&pty.slave).expect("tcgetattr failed")
+    };
+
+    // Make sure postprocessing '\r' isn't specified by default or this test is useless.
+    assert!(!termios
+        .output_flags
+        .contains(OutputFlags::OPOST | OutputFlags::OCRNL));
+
+    // Specify that '\r' characters should be transformed to '\n'
+    // OPOST is specified to enable post-processing
+    termios
+        .output_flags
+        .insert(OutputFlags::OPOST | OutputFlags::OCRNL);
+
+    // Open a pty
+    let pty = openpty(None, &termios).unwrap();
+
+    // Write into the master
+    let string = "foofoofoo\r";
+    write_all(&pty.master, string.as_bytes());
+
+    // Read from the slave verifying that the output has been properly transformed
+    let mut buf = [0u8; 10];
+    crate::read_exact(&pty.slave, &mut buf);
+    let transformed_string = "foofoofoo\n";
+    assert_eq!(&buf, transformed_string.as_bytes());
+}
+
+// Test modifying local flags
+#[test]
+fn test_local_flags() {
+    // openpty uses ptname(3) internally
+    let _m = crate::PTSNAME_MTX.lock();
+
+    // Open one pty to get attributes for the second one
+    let mut termios = {
+        let pty = openpty(None, None).unwrap();
+        tcgetattr(&pty.slave).unwrap()
+    };
+
+    // Make sure echo is specified by default or this test is useless.
+    assert!(termios.local_flags.contains(LocalFlags::ECHO));
+
+    // Disable local echo
+    termios.local_flags.remove(LocalFlags::ECHO);
+
+    // Open a new pty with our modified termios settings
+    let pty = openpty(None, &termios).unwrap();
+
+    // Set the master is in nonblocking mode or reading will never return.
+    let flags = fcntl::fcntl(pty.master.as_raw_fd(), fcntl::F_GETFL).unwrap();
+    let new_flags =
+        fcntl::OFlag::from_bits_truncate(flags) | fcntl::OFlag::O_NONBLOCK;
+    fcntl::fcntl(pty.master.as_raw_fd(), fcntl::F_SETFL(new_flags)).unwrap();
+
+    // Write into the master
+    let string = "foofoofoo\r";
+    write_all(&pty.master, string.as_bytes());
+
+    // Try to read from the master, which should not have anything as echoing was disabled.
+    let mut buf = [0u8; 10];
+    let read = read(pty.master.as_raw_fd(), &mut buf).unwrap_err();
+    assert_eq!(read, Errno::EAGAIN);
+}
diff --git a/vendor/nix/test/sys/test_timerfd.rs b/vendor/nix/test/sys/test_timerfd.rs
new file mode 100644
index 000000000..08e292106
--- /dev/null
+++ b/vendor/nix/test/sys/test_timerfd.rs
@@ -0,0 +1,69 @@
+use nix::sys::time::{TimeSpec, TimeValLike};
+use nix::sys::timerfd::{
+    ClockId, Expiration, TimerFd, TimerFlags, TimerSetTimeFlags,
+};
+use std::time::Instant;
+
+#[test]
+pub fn test_timerfd_oneshot() {
+    let timer =
+        TimerFd::new(ClockId::CLOCK_MONOTONIC, TimerFlags::empty()).unwrap();
+
+    let before = Instant::now();
+
+    timer
+        .set(
+            Expiration::OneShot(TimeSpec::seconds(1)),
+            TimerSetTimeFlags::empty(),
+        )
+        .unwrap();
+
+    timer.wait().unwrap();
+
+    let millis = before.elapsed().as_millis();
+    assert!(millis > 900);
+}
+
+#[test]
+pub fn test_timerfd_interval() {
+    let timer =
+        TimerFd::new(ClockId::CLOCK_MONOTONIC, TimerFlags::empty()).unwrap();
+
+    let before = Instant::now();
+    timer
+        .set(
+            Expiration::IntervalDelayed(
+                TimeSpec::seconds(1),
+                TimeSpec::seconds(2),
+            ),
+            TimerSetTimeFlags::empty(),
+        )
+        .unwrap();
+
+    timer.wait().unwrap();
+
+    let start_delay = before.elapsed().as_millis();
+    assert!(start_delay > 900);
+
+    timer.wait().unwrap();
+
+    let interval_delay = before.elapsed().as_millis();
+    assert!(interval_delay > 2900);
+}
+
+#[test]
+pub fn test_timerfd_unset() {
+    let timer =
+        TimerFd::new(ClockId::CLOCK_MONOTONIC, TimerFlags::empty()).unwrap();
+
+    timer
+        .set(
+            Expiration::OneShot(TimeSpec::seconds(1)),
+            TimerSetTimeFlags::empty(),
+        )
+        .unwrap();
+
+    timer.unset().unwrap();
+
+    assert!(timer.get().unwrap().is_none());
+}
diff --git a/vendor/nix/test/sys/test_uio.rs b/vendor/nix/test/sys/test_uio.rs
new file mode 100644
index 000000000..fc09465f1
--- /dev/null
+++ b/vendor/nix/test/sys/test_uio.rs
@@ -0,0 +1,277 @@
+use nix::sys::uio::*;
+use nix::unistd::*;
+use rand::distributions::Alphanumeric;
+use rand::{thread_rng, Rng};
+use std::fs::OpenOptions;
+use std::io::IoSlice;
+use std::os::unix::io::{FromRawFd, OwnedFd};
+use std::{cmp, iter};
+
+#[cfg(not(target_os = "redox"))]
+use std::io::IoSliceMut;
+
+use tempfile::tempdir;
+#[cfg(not(target_os = "redox"))]
+use tempfile::tempfile;
+
+#[test]
+fn test_writev() {
+    let mut to_write = Vec::with_capacity(16 * 128);
+    for _ in 0..16 {
+        let s: String = thread_rng()
+            .sample_iter(&Alphanumeric)
+            .map(char::from)
+            .take(128)
+            .collect();
+        let b = s.as_bytes();
+        to_write.extend(b.iter().cloned());
+    }
+    // Allocate and fill iovecs
+    let mut iovecs = Vec::new();
+    let mut consumed = 0;
+    while consumed < to_write.len() {
+        let left = to_write.len() - consumed;
+        let slice_len = if left <= 64 {
+            left
+        } else {
+            thread_rng().gen_range(64..cmp::min(256, left))
+        };
+        let b = &to_write[consumed..consumed + slice_len];
+        iovecs.push(IoSlice::new(b));
+        consumed += slice_len;
+    }
+    let (reader, writer) = pipe().expect("Couldn't create pipe");
+    // FileDesc will close its filedesc (reader).
+    let mut read_buf: Vec<u8> = iter::repeat(0u8).take(128 * 16).collect();
+
+    // Temporary workaround to cope with the existing RawFd pipe(2), should be
+    // removed when pipe(2) becomes I/O-safe.
+    let writer = unsafe { OwnedFd::from_raw_fd(writer) };
+
+    // Blocking io, should write all data.
+    let write_res = writev(&writer, &iovecs);
+    let written = write_res.expect("couldn't write");
+    // Check whether we written all data
+    assert_eq!(to_write.len(), written);
+    let read_res = read(reader, &mut read_buf[..]);
+    let read = read_res.expect("couldn't read");
+    // Check we have read as much as we written
+    assert_eq!(read, written);
+    // Check equality of written and read data
+    assert_eq!(&to_write, &read_buf);
+    close(reader).expect("closed reader");
+}
+
+#[test]
+#[cfg(not(target_os = "redox"))]
+fn test_readv() {
+    let s: String = thread_rng()
+        .sample_iter(&Alphanumeric)
+        .map(char::from)
+        .take(128)
+        .collect();
+    let to_write = s.as_bytes().to_vec();
+    let mut storage = Vec::new();
+    let mut allocated = 0;
+    while allocated < to_write.len() {
+        let left = to_write.len() - allocated;
+        let vec_len = if left <= 64 {
+            left
+        } else {
+            thread_rng().gen_range(64..cmp::min(256, left))
+        };
+        let v: Vec<u8> = iter::repeat(0u8).take(vec_len).collect();
+        storage.push(v);
+        allocated += vec_len;
+    }
+    let mut iovecs = Vec::with_capacity(storage.len());
+    for v in &mut storage {
+        iovecs.push(IoSliceMut::new(&mut v[..]));
+    }
+    let (reader, writer) = pipe().expect("couldn't create pipe");
+    // Blocking io, should write all data.
+    write(writer, &to_write).expect("write failed");
+
+    // Temporary workaround to cope with the existing RawFd pipe(2), should be
+    // removed when pipe(2) becomes I/O-safe.
+    let reader = unsafe { OwnedFd::from_raw_fd(reader) };
+
+    let read = readv(&reader, &mut iovecs[..]).expect("read failed");
+    // Check whether we've read all data
+    assert_eq!(to_write.len(), read);
+    // Cccumulate data from iovecs
+    let mut read_buf = Vec::with_capacity(to_write.len());
+    for iovec in &iovecs {
+        read_buf.extend(iovec.iter().cloned());
+    }
+    // Check whether iovecs contain all written data
+    assert_eq!(read_buf.len(), to_write.len());
+    // Check equality of written and read data
+    assert_eq!(&read_buf, &to_write);
+    close(writer).expect("couldn't close writer");
+}
+
+#[test]
+#[cfg(not(target_os = "redox"))]
+fn test_pwrite() {
+    use std::io::Read;
+
+    let mut file = tempfile().unwrap();
+    let buf = [1u8; 8];
+    assert_eq!(Ok(8), pwrite(&file, &buf, 8));
+    let mut file_content = Vec::new();
+    file.read_to_end(&mut file_content).unwrap();
+    let mut expected = vec![0u8; 8];
+    expected.extend(vec![1; 8]);
+    assert_eq!(file_content, expected);
+}
+
+#[test]
+fn test_pread() {
+    use std::io::Write;
+
+    let tempdir = tempdir().unwrap();
+
+    let path = tempdir.path().join("pread_test_file");
+    let mut file = OpenOptions::new()
+        .write(true)
+        .read(true)
+        .create(true)
+        .truncate(true)
+        .open(path)
+        .unwrap();
+    let file_content: Vec<u8> = (0..64).collect();
+    file.write_all(&file_content).unwrap();
+
+    let mut buf = [0u8; 16];
+    assert_eq!(Ok(16), pread(&file, &mut buf, 16));
+    let expected: Vec<_> = (16..32).collect();
+    assert_eq!(&buf[..], &expected[..]);
+}
+
+#[test]
+#[cfg(not(any(target_os = "redox", target_os = "haiku")))]
+fn test_pwritev() {
+    use std::io::Read;
+
+    let to_write: Vec<u8> = (0..128).collect();
+    let expected: Vec<u8> = [vec![0; 100], to_write.clone()].concat();
+
+    let iovecs = [
+        IoSlice::new(&to_write[0..17]),
+        IoSlice::new(&to_write[17..64]),
+        IoSlice::new(&to_write[64..128]),
+    ];
+
+    let tempdir = tempdir().unwrap();
+
+    // pwritev them into a temporary file
+    let path = tempdir.path().join("pwritev_test_file");
+    let mut file = OpenOptions::new()
+        .write(true)
+        .read(true)
+        .create(true)
+        .truncate(true)
+        .open(path)
+        .unwrap();
+
+    let written = pwritev(&file, &iovecs, 100).ok().unwrap();
+    assert_eq!(written, to_write.len());
+
+    // Read the data back and make sure it matches
+    let mut contents = Vec::new();
+    file.read_to_end(&mut contents).unwrap();
+    assert_eq!(contents, expected);
+}
+
+#[test]
+#[cfg(not(any(target_os = "redox", target_os = "haiku")))]
+fn test_preadv() {
+    use std::io::Write;
+
+    let to_write: Vec<u8> = (0..200).collect();
+    let expected: Vec<u8> = (100..200).collect();
+
+    let tempdir = tempdir().unwrap();
+
+    let path = tempdir.path().join("preadv_test_file");
+
+    let mut file = OpenOptions::new()
+        .read(true)
+        .write(true)
+        .create(true)
+        .truncate(true)
+        .open(path)
+        .unwrap();
+    file.write_all(&to_write).unwrap();
+
+    let mut buffers: Vec<Vec<u8>> = vec![vec![0; 24], vec![0; 1], vec![0; 75]];
+
+    {
+        // Borrow the buffers into IoVecs and preadv into them
+        let mut iovecs: Vec<_> = buffers
+            .iter_mut()
+            .map(|buf| IoSliceMut::new(&mut buf[..]))
+            .collect();
+        assert_eq!(Ok(100), preadv(&file, &mut iovecs, 100));
+    }
+
+    let all = buffers.concat();
+    assert_eq!(all, expected);
+}
+
+#[test]
+#[cfg(all(target_os = "linux", not(target_env = "uclibc")))]
+// uclibc doesn't implement process_vm_readv
+// qemu-user doesn't implement process_vm_readv/writev on most arches
+#[cfg_attr(qemu, ignore)]
+fn test_process_vm_readv() {
+    use crate::*;
+    use nix::sys::signal::*;
+    use nix::sys::wait::*;
+    use nix::unistd::ForkResult::*;
+
+    require_capability!("test_process_vm_readv", CAP_SYS_PTRACE);
+    let _m = crate::FORK_MTX.lock();
+
+    // Pre-allocate memory in the child, since allocation isn't safe
+    // post-fork (~= async-signal-safe)
+    let mut vector = vec![1u8, 2, 3, 4, 5];
+
+    let (r, w) = pipe().unwrap();
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Parent { child } => {
+            close(w).unwrap();
+            // wait for child
+            read(r, &mut [0u8]).unwrap();
+            close(r).unwrap();
+
+            let ptr = vector.as_ptr() as usize;
+            let remote_iov = RemoteIoVec { base: ptr, len: 5 };
+            let mut buf = vec![0u8; 5];
+
+            let ret = process_vm_readv(
+                child,
+                &mut [IoSliceMut::new(&mut buf)],
+                &[remote_iov],
+            );
+
+            kill(child, SIGTERM).unwrap();
+            waitpid(child, None).unwrap();
+
+            assert_eq!(Ok(5), ret);
+            assert_eq!(20u8, buf.iter().sum());
+        }
+        Child => {
+            let _ = close(r);
+            for i in &mut vector {
+                *i += 1;
+            }
+            let _ = write(w, b"\0");
+            let _ = close(w);
+            loop {
+                pause();
+            }
+        }
+    }
+}
diff --git a/vendor/nix/test/sys/test_wait.rs b/vendor/nix/test/sys/test_wait.rs
new file mode 100644
index 000000000..d472f1ec1
--- /dev/null
+++ b/vendor/nix/test/sys/test_wait.rs
@@ -0,0 +1,257 @@
+use libc::_exit;
+use nix::errno::Errno;
+use nix::sys::signal::*;
+use nix::sys::wait::*;
+use nix::unistd::ForkResult::*;
+use nix::unistd::*;
+
+#[test]
+#[cfg(not(any(target_os = "redox", target_os = "haiku")))]
+fn test_wait_signal() {
+    let _m = crate::FORK_MTX.lock();
+
+    // Safe: The child only calls `pause` and/or `_exit`, which are async-signal-safe.
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Child => {
+            pause();
+            unsafe { _exit(123) }
+        }
+        Parent { child } => {
+            kill(child, Some(SIGKILL)).expect("Error: Kill Failed");
+            assert_eq!(
+                waitpid(child, None),
+                Ok(WaitStatus::Signaled(child, SIGKILL, false))
+            );
+        }
+    }
+}
+
+#[test]
+#[cfg(any(
+    target_os = "android",
+    target_os = "freebsd",
+    //target_os = "haiku",
+    all(target_os = "linux", not(target_env = "uclibc")),
+))]
+#[cfg(not(any(target_arch = "mips", target_arch = "mips64")))]
+fn test_waitid_signal() {
+    let _m = crate::FORK_MTX.lock();
+
+    // Safe: The child only calls `pause` and/or `_exit`, which are async-signal-safe.
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Child => {
+            pause();
+            unsafe { _exit(123) }
+        }
+        Parent { child } => {
+            kill(child, Some(SIGKILL)).expect("Error: Kill Failed");
+            assert_eq!(
+                waitid(Id::Pid(child), WaitPidFlag::WEXITED),
+                Ok(WaitStatus::Signaled(child, SIGKILL, false)),
+            );
+        }
+    }
+}
+
+#[test]
+fn test_wait_exit() {
+    let _m = crate::FORK_MTX.lock();
+
+    // Safe: Child only calls `_exit`, which is async-signal-safe.
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Child => unsafe {
+            _exit(12);
+        },
+        Parent { child } => {
+            assert_eq!(waitpid(child, None), Ok(WaitStatus::Exited(child, 12)));
+        }
+    }
+}
+
+#[cfg(not(target_os = "haiku"))]
+#[test]
+#[cfg(any(
+    target_os = "android",
+    target_os = "freebsd",
+    target_os = "haiku",
+    all(target_os = "linux", not(target_env = "uclibc")),
+))]
+#[cfg(not(any(target_arch = "mips", target_arch = "mips64")))]
+fn test_waitid_exit() {
+    let _m = crate::FORK_MTX.lock();
+
+    // Safe: Child only calls `_exit`, which is async-signal-safe.
+    match unsafe { fork() }.expect("Error: Fork Failed") {
+        Child => unsafe {
+            _exit(12);
+        },
+        Parent { child } => {
+            assert_eq!(
+                waitid(Id::Pid(child), WaitPidFlag::WEXITED),
+                Ok(WaitStatus::Exited(child, 12)),
+            );
+        }
+    }
+}
+
+#[test]
+fn test_waitstatus_from_raw() {
+    let pid = Pid::from_raw(1);
+    assert_eq!(
+        WaitStatus::from_raw(pid, 0x0002),
+        Ok(WaitStatus::Signaled(pid, Signal::SIGINT, false))
+    );
+    assert_eq!(
+        WaitStatus::from_raw(pid, 0x0200),
+        Ok(WaitStatus::Exited(pid, 2))
+    );
+    assert_eq!(WaitStatus::from_raw(pid, 0x7f7f), Err(Errno::EINVAL));
+}
+
+#[test]
+fn test_waitstatus_pid() {
+    let _m = crate::FORK_MTX.lock();
+
+    match unsafe { fork() }.unwrap() {
+        Child => unsafe { _exit(0) },
+        Parent { child } => {
+            let status = waitpid(child, None).unwrap();
+            assert_eq!(status.pid(), Some(child));
+        }
+    }
+}
+
+#[test]
+#[cfg(any(
+    target_os = "android",
+    target_os = "freebsd",
+    target_os = "haiku",
+    all(target_os = "linux", not(target_env = "uclibc")),
+))]
+fn test_waitid_pid() {
+    let _m = crate::FORK_MTX.lock();
+
+    match unsafe { fork() }.unwrap() {
+        Child => unsafe { _exit(0) },
+        Parent { child } => {
+            let status = waitid(Id::Pid(child), WaitPidFlag::WEXITED).unwrap();
+            assert_eq!(status.pid(), Some(child));
+        }
+    }
+}
+
+#[cfg(any(target_os = "linux", target_os = "android"))]
+// FIXME: qemu-user doesn't implement ptrace on most arches
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+mod ptrace {
+    use crate::*;
+    use libc::_exit;
+    use nix::sys::ptrace::{self, Event, Options};
+    use nix::sys::signal::*;
+    use nix::sys::wait::*;
+    use nix::unistd::ForkResult::*;
+    use nix::unistd::*;
+
+    fn ptrace_child() -> ! {
+        ptrace::traceme().unwrap();
+        // As recommended by ptrace(2), raise SIGTRAP to pause the child
+        // until the parent is ready to continue
+        raise(SIGTRAP).unwrap();
+        unsafe { _exit(0) }
+    }
+
+    fn ptrace_wait_parent(child: Pid) {
+        // Wait for the raised SIGTRAP
+        assert_eq!(
+            waitpid(child, None),
+            Ok(WaitStatus::Stopped(child, SIGTRAP))
+        );
+        // We want to test a syscall stop and a PTRACE_EVENT stop
+        ptrace::setoptions(
+            child,
+            Options::PTRACE_O_TRACESYSGOOD | Options::PTRACE_O_TRACEEXIT,
+        )
+        .expect("setoptions failed");
+
+        // First, stop on the next system call, which will be exit()
+        ptrace::syscall(child, None).expect("syscall failed");
+        assert_eq!(waitpid(child, None), Ok(WaitStatus::PtraceSyscall(child)));
+        // Then get the ptrace event for the process exiting
+        ptrace::cont(child, None).expect("cont failed");
+        assert_eq!(
+            waitpid(child, None),
+            Ok(WaitStatus::PtraceEvent(
+                child,
+                SIGTRAP,
+                Event::PTRACE_EVENT_EXIT as i32
+            ))
+        );
+        // Finally get the normal wait() result, now that the process has exited
+        ptrace::cont(child, None).expect("cont failed");
+        assert_eq!(waitpid(child, None), Ok(WaitStatus::Exited(child, 0)));
+    }
+
+    #[cfg(not(target_env = "uclibc"))]
+    fn ptrace_waitid_parent(child: Pid) {
+        // Wait for the raised SIGTRAP
+        //
+        // Unlike waitpid(), waitid() can distinguish trap events from regular
+        // stop events, so unlike ptrace_wait_parent(), we get a PtraceEvent here
+        assert_eq!(
+            waitid(Id::Pid(child), WaitPidFlag::WEXITED),
+            Ok(WaitStatus::PtraceEvent(child, SIGTRAP, 0)),
+        );
+        // We want to test a syscall stop and a PTRACE_EVENT stop
+        ptrace::setoptions(
+            child,
+            Options::PTRACE_O_TRACESYSGOOD | Options::PTRACE_O_TRACEEXIT,
+        )
+        .expect("setopts failed");
+
+        // First, stop on the next system call, which will be exit()
+        ptrace::syscall(child, None).expect("syscall failed");
+        assert_eq!(
+            waitid(Id::Pid(child), WaitPidFlag::WEXITED),
+            Ok(WaitStatus::PtraceSyscall(child)),
+        );
+        // Then get the ptrace event for the process exiting
+        ptrace::cont(child, None).expect("cont failed");
+        assert_eq!(
+            waitid(Id::Pid(child), WaitPidFlag::WEXITED),
+            Ok(WaitStatus::PtraceEvent(
+                child,
+                SIGTRAP,
+                Event::PTRACE_EVENT_EXIT as i32
+            )),
+        );
+        // Finally get the normal wait() result, now that the process has exited
+        ptrace::cont(child, None).expect("cont failed");
+        assert_eq!(
+            waitid(Id::Pid(child), WaitPidFlag::WEXITED),
+            Ok(WaitStatus::Exited(child, 0)),
+        );
+    }
+
+    #[test]
+    fn test_wait_ptrace() {
+        require_capability!("test_wait_ptrace", CAP_SYS_PTRACE);
+        let _m = crate::FORK_MTX.lock();
+
+        match unsafe { fork() }.expect("Error: Fork Failed") {
+            Child => ptrace_child(),
+            Parent { child } => ptrace_wait_parent(child),
+        }
+    }
+
+    #[test]
+    #[cfg(not(target_env = "uclibc"))]
+    fn test_waitid_ptrace() {
+        require_capability!("test_waitid_ptrace", CAP_SYS_PTRACE);
+        let _m = crate::FORK_MTX.lock();
+
+        match unsafe { fork() }.expect("Error: Fork Failed") {
+            Child => ptrace_child(),
+            Parent { child } => ptrace_waitid_parent(child),
+        }
+    }
+}