1 files changed, 111 insertions, 0 deletions
diff --git a/vendor/rustix/src/imp/libc/mod.rs b/vendor/rustix/src/imp/libc/mod.rs
new file mode 100644
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+++ b/vendor/rustix/src/imp/libc/mod.rs
@@ -0,0 +1,111 @@
+//! The libc backend.
+//!
+//! On most platforms, this uses the `libc` crate to make system calls. On
+//! Windows, this uses the Winsock2 API in `windows-sys`, which can be adapted
+//! to have a very `libc`-like interface.
+
+// Every FFI call requires an unsafe block, and there are a lot of FFI
+// calls. For now, set this to allow for the libc backend.
+#![allow(clippy::undocumented_unsafe_blocks)]
+// Lots of libc types vary between platforms, so we often need a `.into()` on
+// one platform where it's redundant on another.
+#![allow(clippy::useless_conversion)]
+
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[macro_use]
+mod weak;
+
+mod conv;
+mod offset;
+
+#[cfg(windows)]
+mod io_lifetimes;
+#[cfg(not(windows))]
+#[cfg(not(feature = "std"))]
+pub(crate) mod fd {
+    pub(crate) use super::c::c_int as LibcFd;
+    pub use crate::io::fd::*;
+}
+#[cfg(windows)]
+pub(crate) mod fd {
+    pub use super::io_lifetimes::*;
+}
+#[cfg(not(windows))]
+#[cfg(feature = "std")]
+pub(crate) mod fd {
+    pub use io_lifetimes::*;
+
+    #[cfg(target_os = "wasi")]
+    #[allow(unused_imports)]
+    pub(crate) use super::c::c_int as LibcFd;
+    #[cfg(unix)]
+    #[allow(unused_imports)]
+    pub(crate) use std::os::unix::io::RawFd as LibcFd;
+    #[cfg(unix)]
+    pub use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+    #[cfg(target_os = "wasi")]
+    pub use std::os::wasi::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+}
+
+// On Windows we emulate selected libc-compatible interfaces. On non-Windows,
+// we just use libc here, since this is the libc backend.
+#[cfg(windows)]
+#[path = "winsock_c.rs"]
+pub(crate) mod c;
+#[cfg(not(windows))]
+pub(crate) use libc as c;
+
+#[cfg(not(windows))]
+// #[cfg(feature = "fs")] // TODO: Enable this once `OwnedFd` moves out of the tree.
+pub(crate) mod fs;
+pub(crate) mod io;
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg(feature = "io_uring")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "io_uring")))]
+pub(crate) mod io_uring;
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[cfg(any(feature = "mm", feature = "time", target_arch = "x86"))] // vdso.rs uses `madvise`
+pub(crate) mod mm;
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(feature = "net")]
+pub(crate) mod net;
+#[cfg(not(windows))]
+#[cfg(any(
+    feature = "param",
+    feature = "runtime",
+    feature = "time",
+    target_arch = "x86",
+))]
+pub(crate) mod param;
+#[cfg(not(windows))]
+pub(crate) mod process;
+#[cfg(not(windows))]
+#[cfg(feature = "rand")]
+pub(crate) mod rand;
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[cfg(feature = "termios")]
+pub(crate) mod termios;
+#[cfg(not(windows))]
+#[cfg(feature = "thread")]
+pub(crate) mod thread;
+#[cfg(not(windows))]
+pub(crate) mod time;
+
+/// If the host libc is glibc, return `true` if it is less than version 2.25.
+///
+/// To restate and clarify, this function returning true does not mean the libc
+/// is glibc just that if it is glibc, it is less than version 2.25.
+///
+/// For now, this function is only available on Linux, but if it ends up being
+/// used beyond that, this could be changed to e.g. `#[cfg(unix)]`.
+#[cfg(all(unix, target_env = "gnu"))]
+pub(crate) fn if_glibc_is_less_than_2_25() -> bool {
+    // This is also defined inside `weak_or_syscall!` in
+    // imp/libc/rand/syscalls.rs, but it's not convenient to re-export the weak
+    // symbol from that macro, so we duplicate it at a small cost here.
+    weak! { fn getrandom(*mut c::c_void, c::size_t, c::c_uint) -> c::ssize_t }
+
+    // glibc 2.25 has `getrandom`, which is how we satisfy the API contract of
+    // this function. But, there are likely other libc versions which have it.
+    getrandom.get().is_none()
+}