diff options
Diffstat (limited to 'library/std/src/sys/unix')
| -rw-r--r-- | library/std/src/sys/unix/fs.rs | 483 | ||||
| -rw-r--r-- | library/std/src/sys/unix/io.rs | 6 | ||||
| -rw-r--r-- | library/std/src/sys/unix/kernel_copy.rs | 2 | ||||
| -rw-r--r-- | library/std/src/sys/unix/locks/mod.rs | 6 | ||||
| -rw-r--r-- | library/std/src/sys/unix/mod.rs | 42 | ||||
| -rw-r--r-- | library/std/src/sys/unix/os.rs | 59 | ||||
| -rw-r--r-- | library/std/src/sys/unix/process/process_common.rs | 2 | ||||
| -rw-r--r-- | library/std/src/sys/unix/process/process_common/tests.rs | 79 | ||||
| -rw-r--r-- | library/std/src/sys/unix/process/process_fuchsia.rs | 2 | ||||
| -rw-r--r-- | library/std/src/sys/unix/process/process_unix.rs | 76 | ||||
| -rw-r--r-- | library/std/src/sys/unix/stdio.rs | 50 | ||||
| -rw-r--r-- | library/std/src/sys/unix/thread.rs | 29 | ||||
| -rw-r--r-- | library/std/src/sys/unix/thread_local_dtor.rs | 1 | ||||
| -rw-r--r-- | library/std/src/sys/unix/thread_local_key.rs | 5 | ||||
| -rw-r--r-- | library/std/src/sys/unix/thread_parker/darwin.rs | 131 | ||||
| -rw-r--r-- | library/std/src/sys/unix/thread_parker/mod.rs | 13 | ||||
| -rw-r--r-- | library/std/src/sys/unix/time.rs | 34 |
17 files changed, 613 insertions, 407 deletions
diff --git a/library/std/src/sys/unix/fs.rs b/library/std/src/sys/unix/fs.rs index cc347e358..37a49f2d7 100644 --- a/library/std/src/sys/unix/fs.rs +++ b/library/std/src/sys/unix/fs.rs @@ -1,13 +1,26 @@ +// miri has some special hacks here that make things unused. +#![cfg_attr(miri, allow(unused))] + use crate::os::unix::prelude::*; -use crate::ffi::{CStr, CString, OsStr, OsString}; +use crate::ffi::{CStr, OsStr, OsString}; use crate::fmt; use crate::io::{self, BorrowedCursor, Error, IoSlice, IoSliceMut, SeekFrom}; use crate::mem; +#[cfg(any( + target_os = "android", + target_os = "linux", + target_os = "solaris", + target_os = "fuchsia", + target_os = "redox", + target_os = "illumos" +))] +use crate::mem::MaybeUninit; use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd}; use crate::path::{Path, PathBuf}; use crate::ptr; use crate::sync::Arc; +use crate::sys::common::small_c_string::run_path_with_cstr; use crate::sys::fd::FileDesc; use crate::sys::time::SystemTime; use crate::sys::{cvt, cvt_r}; @@ -260,7 +273,7 @@ pub struct DirEntry { // We need to store an owned copy of the entry name on platforms that use // readdir() (not readdir_r()), because a) struct dirent may use a flexible // array to store the name, b) it lives only until the next readdir() call. - name: CString, + name: crate::ffi::CString, } // Define a minimal subset of fields we need from `dirent64`, especially since @@ -313,8 +326,11 @@ pub struct FilePermissions { mode: mode_t, } -#[derive(Copy, Clone)] -pub struct FileTimes([libc::timespec; 2]); +#[derive(Copy, Clone, Debug, Default)] +pub struct FileTimes { + accessed: Option<SystemTime>, + modified: Option<SystemTime>, +} #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)] pub struct FileType { @@ -512,45 +528,11 @@ impl FilePermissions { impl FileTimes { pub fn set_accessed(&mut self, t: SystemTime) { - self.0[0] = t.t.to_timespec().expect("Invalid system time"); + self.accessed = Some(t); } pub fn set_modified(&mut self, t: SystemTime) { - self.0[1] = t.t.to_timespec().expect("Invalid system time"); - } -} - -struct TimespecDebugAdapter<'a>(&'a libc::timespec); - -impl fmt::Debug for TimespecDebugAdapter<'_> { - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.debug_struct("timespec") - .field("tv_sec", &self.0.tv_sec) - .field("tv_nsec", &self.0.tv_nsec) - .finish() - } -} - -impl fmt::Debug for FileTimes { - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.debug_struct("FileTimes") - .field("accessed", &TimespecDebugAdapter(&self.0[0])) - .field("modified", &TimespecDebugAdapter(&self.0[1])) - .finish() - } -} - -impl Default for FileTimes { - fn default() -> Self { - // Redox doesn't appear to support `UTIME_OMIT`, so we stub it out here, and always return - // an error in `set_times`. - // ESP-IDF and HorizonOS do not support `futimens` at all and the behavior for those OS is therefore - // the same as for Redox. - #[cfg(any(target_os = "redox", target_os = "espidf", target_os = "horizon"))] - let omit = libc::timespec { tv_sec: 0, tv_nsec: 0 }; - #[cfg(not(any(target_os = "redox", target_os = "espidf", target_os = "horizon")))] - let omit = libc::timespec { tv_sec: 0, tv_nsec: libc::UTIME_OMIT as _ }; - Self([omit; 2]) + self.modified = Some(t); } } @@ -614,33 +596,69 @@ impl Iterator for ReadDir { }; } - // Only d_reclen bytes of *entry_ptr are valid, so we can't just copy the - // whole thing (#93384). Instead, copy everything except the name. - let mut copy: dirent64 = mem::zeroed(); - // Can't dereference entry_ptr, so use the local entry to get - // offsetof(struct dirent, d_name) - let copy_bytes = &mut copy as *mut _ as *mut u8; - let copy_name = &mut copy.d_name as *mut _ as *mut u8; - let name_offset = copy_name.offset_from(copy_bytes) as usize; - let entry_bytes = entry_ptr as *const u8; - let entry_name = entry_bytes.add(name_offset); - ptr::copy_nonoverlapping(entry_bytes, copy_bytes, name_offset); + // The dirent64 struct is a weird imaginary thing that isn't ever supposed + // to be worked with by value. Its trailing d_name field is declared + // variously as [c_char; 256] or [c_char; 1] on different systems but + // either way that size is meaningless; only the offset of d_name is + // meaningful. The dirent64 pointers that libc returns from readdir64 are + // allowed to point to allocations smaller _or_ LARGER than implied by the + // definition of the struct. + // + // As such, we need to be even more careful with dirent64 than if its + // contents were "simply" partially initialized data. + // + // Like for uninitialized contents, converting entry_ptr to `&dirent64` + // would not be legal. However, unique to dirent64 is that we don't even + // get to use `addr_of!((*entry_ptr).d_name)` because that operation + // requires the full extent of *entry_ptr to be in bounds of the same + // allocation, which is not necessarily the case here. + // + // Absent any other way to obtain a pointer to `(*entry_ptr).d_name` + // legally in Rust analogously to how it would be done in C, we instead + // need to make our own non-libc allocation that conforms to the weird + // imaginary definition of dirent64, and use that for a field offset + // computation. + macro_rules! offset_ptr { + ($entry_ptr:expr, $field:ident) => {{ + const OFFSET: isize = { + let delusion = MaybeUninit::<dirent64>::uninit(); + let entry_ptr = delusion.as_ptr(); + unsafe { + ptr::addr_of!((*entry_ptr).$field) + .cast::<u8>() + .offset_from(entry_ptr.cast::<u8>()) + } + }; + if true { + // Cast to the same type determined by the else branch. + $entry_ptr.byte_offset(OFFSET).cast::<_>() + } else { + #[allow(deref_nullptr)] + { + ptr::addr_of!((*ptr::null::<dirent64>()).$field) + } + } + }}; + } + + // d_name is guaranteed to be null-terminated. + let name = CStr::from_ptr(offset_ptr!(entry_ptr, d_name).cast()); + let name_bytes = name.to_bytes(); + if name_bytes == b"." || name_bytes == b".." { + continue; + } let entry = dirent64_min { - d_ino: copy.d_ino as u64, + d_ino: *offset_ptr!(entry_ptr, d_ino) as u64, #[cfg(not(any(target_os = "solaris", target_os = "illumos")))] - d_type: copy.d_type as u8, + d_type: *offset_ptr!(entry_ptr, d_type) as u8, }; - let ret = DirEntry { + return Some(Ok(DirEntry { entry, - // d_name is guaranteed to be null-terminated. - name: CStr::from_ptr(entry_name as *const _).to_owned(), + name: name.to_owned(), dir: Arc::clone(&self.inner), - }; - if ret.name_bytes() != b"." && ret.name_bytes() != b".." { - return Some(Ok(ret)); - } + })); } } } @@ -704,7 +722,10 @@ impl DirEntry { self.file_name_os_str().to_os_string() } - #[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "android"))] + #[cfg(all( + any(target_os = "linux", target_os = "emscripten", target_os = "android"), + not(miri) + ))] pub fn metadata(&self) -> io::Result<FileAttr> { let fd = cvt(unsafe { dirfd(self.dir.dirp.0) })?; let name = self.name_cstr().as_ptr(); @@ -725,7 +746,10 @@ impl DirEntry { Ok(FileAttr::from_stat64(stat)) } - #[cfg(not(any(target_os = "linux", target_os = "emscripten", target_os = "android")))] + #[cfg(any( + not(any(target_os = "linux", target_os = "emscripten", target_os = "android")), + miri + ))] pub fn metadata(&self) -> io::Result<FileAttr> { lstat(&self.path()) } @@ -829,7 +853,6 @@ impl DirEntry { target_os = "fuchsia", target_os = "redox" )))] - #[cfg_attr(miri, allow(unused))] fn name_cstr(&self) -> &CStr { unsafe { CStr::from_ptr(self.entry.d_name.as_ptr()) } } @@ -841,7 +864,6 @@ impl DirEntry { target_os = "fuchsia", target_os = "redox" ))] - #[cfg_attr(miri, allow(unused))] fn name_cstr(&self) -> &CStr { &self.name } @@ -931,8 +953,7 @@ impl OpenOptions { impl File { pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> { - let path = cstr(path)?; - File::open_c(&path, opts) + run_path_with_cstr(path, |path| File::open_c(path, opts)) } pub fn open_c(path: &CStr, opts: &OpenOptions) -> io::Result<File> { @@ -1084,6 +1105,17 @@ impl File { } pub fn set_times(&self, times: FileTimes) -> io::Result<()> { + #[cfg(not(any(target_os = "redox", target_os = "espidf", target_os = "horizon")))] + let to_timespec = |time: Option<SystemTime>| { + match time { + Some(time) if let Some(ts) = time.t.to_timespec() => Ok(ts), + Some(time) if time > crate::sys::time::UNIX_EPOCH => Err(io::const_io_error!(io::ErrorKind::InvalidInput, "timestamp is too large to set as a file time")), + Some(_) => Err(io::const_io_error!(io::ErrorKind::InvalidInput, "timestamp is too small to set as a file time")), + None => Ok(libc::timespec { tv_sec: 0, tv_nsec: libc::UTIME_OMIT as _ }), + } + }; + #[cfg(not(any(target_os = "redox", target_os = "espidf", target_os = "horizon")))] + let times = [to_timespec(times.accessed)?, to_timespec(times.modified)?]; cfg_if::cfg_if! { if #[cfg(any(target_os = "redox", target_os = "espidf", target_os = "horizon"))] { // Redox doesn't appear to support `UTIME_OMIT`. @@ -1099,7 +1131,7 @@ impl File { cvt(unsafe { weak!(fn futimens(c_int, *const libc::timespec) -> c_int); match futimens.get() { - Some(futimens) => futimens(self.as_raw_fd(), times.0.as_ptr()), + Some(futimens) => futimens(self.as_raw_fd(), times.as_ptr()), #[cfg(target_os = "macos")] None => { fn ts_to_tv(ts: &libc::timespec) -> libc::timeval { @@ -1108,7 +1140,7 @@ impl File { tv_usec: (ts.tv_nsec / 1000) as _ } } - let timevals = [ts_to_tv(×.0[0]), ts_to_tv(×.0[1])]; + let timevals = [ts_to_tv(×[0]), ts_to_tv(×[1])]; libc::futimes(self.as_raw_fd(), timevals.as_ptr()) } // futimes requires even newer Android. @@ -1121,7 +1153,7 @@ impl File { })?; Ok(()) } else { - cvt(unsafe { libc::futimens(self.as_raw_fd(), times.0.as_ptr()) })?; + cvt(unsafe { libc::futimens(self.as_raw_fd(), times.as_ptr()) })?; Ok(()) } } @@ -1134,9 +1166,7 @@ impl DirBuilder { } pub fn mkdir(&self, p: &Path) -> io::Result<()> { - let p = cstr(p)?; - cvt(unsafe { libc::mkdir(p.as_ptr(), self.mode) })?; - Ok(()) + run_path_with_cstr(p, |p| cvt(unsafe { libc::mkdir(p.as_ptr(), self.mode) }).map(|_| ())) } pub fn set_mode(&mut self, mode: u32) { @@ -1144,10 +1174,6 @@ impl DirBuilder { } } -fn cstr(path: &Path) -> io::Result<CString> { - Ok(CString::new(path.as_os_str().as_bytes())?) -} - impl AsInner<FileDesc> for File { fn as_inner(&self) -> &FileDesc { &self.0 @@ -1198,7 +1224,12 @@ impl FromRawFd for File { impl fmt::Debug for File { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - #[cfg(any(target_os = "linux", target_os = "netbsd"))] + #[cfg(any( + target_os = "linux", + target_os = "netbsd", + target_os = "illumos", + target_os = "solaris" + ))] fn get_path(fd: c_int) -> Option<PathBuf> { let mut p = PathBuf::from("/proc/self/fd"); p.push(&fd.to_string()); @@ -1253,14 +1284,23 @@ impl fmt::Debug for File { target_os = "macos", target_os = "vxworks", all(target_os = "freebsd", target_arch = "x86_64"), - target_os = "netbsd" + target_os = "netbsd", + target_os = "illumos", + target_os = "solaris" )))] fn get_path(_fd: c_int) -> Option<PathBuf> { // FIXME(#24570): implement this for other Unix platforms None } - #[cfg(any(target_os = "linux", target_os = "macos", target_os = "vxworks"))] + #[cfg(any( + target_os = "linux", + target_os = "macos", + target_os = "freebsd", + target_os = "netbsd", + target_os = "openbsd", + target_os = "vxworks" + ))] fn get_mode(fd: c_int) -> Option<(bool, bool)> { let mode = unsafe { libc::fcntl(fd, libc::F_GETFL) }; if mode == -1 { @@ -1274,7 +1314,14 @@ impl fmt::Debug for File { } } - #[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "vxworks")))] + #[cfg(not(any( + target_os = "linux", + target_os = "macos", + target_os = "freebsd", + target_os = "netbsd", + target_os = "openbsd", + target_os = "vxworks" + )))] fn get_mode(_fd: c_int) -> Option<(bool, bool)> { // FIXME(#24570): implement this for other Unix platforms None @@ -1293,173 +1340,170 @@ impl fmt::Debug for File { } } -pub fn readdir(p: &Path) -> io::Result<ReadDir> { - let root = p.to_path_buf(); - let p = cstr(p)?; - unsafe { - let ptr = libc::opendir(p.as_ptr()); - if ptr.is_null() { - Err(Error::last_os_error()) - } else { - let inner = InnerReadDir { dirp: Dir(ptr), root }; - Ok(ReadDir { - inner: Arc::new(inner), - #[cfg(not(any( - target_os = "android", - target_os = "linux", - target_os = "solaris", - target_os = "illumos", - target_os = "fuchsia", - target_os = "redox", - )))] - end_of_stream: false, - }) - } +pub fn readdir(path: &Path) -> io::Result<ReadDir> { + let ptr = run_path_with_cstr(path, |p| unsafe { Ok(libc::opendir(p.as_ptr())) })?; + if ptr.is_null() { + Err(Error::last_os_error()) + } else { + let root = path.to_path_buf(); + let inner = InnerReadDir { dirp: Dir(ptr), root }; + Ok(ReadDir { + inner: Arc::new(inner), + #[cfg(not(any( + target_os = "android", + target_os = "linux", + target_os = "solaris", + target_os = "illumos", + target_os = "fuchsia", + target_os = "redox", + )))] + end_of_stream: false, + }) } } pub fn unlink(p: &Path) -> io::Result<()> { - let p = cstr(p)?; - cvt(unsafe { libc::unlink(p.as_ptr()) })?; - Ok(()) + run_path_with_cstr(p, |p| cvt(unsafe { libc::unlink(p.as_ptr()) }).map(|_| ())) } pub fn rename(old: &Path, new: &Path) -> io::Result<()> { - let old = cstr(old)?; - let new = cstr(new)?; - cvt(unsafe { libc::rename(old.as_ptr(), new.as_ptr()) })?; - Ok(()) + run_path_with_cstr(old, |old| { + run_path_with_cstr(new, |new| { + cvt(unsafe { libc::rename(old.as_ptr(), new.as_ptr()) }).map(|_| ()) + }) + }) } pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> { - let p = cstr(p)?; - cvt_r(|| unsafe { libc::chmod(p.as_ptr(), perm.mode) })?; - Ok(()) + run_path_with_cstr(p, |p| cvt_r(|| unsafe { libc::chmod(p.as_ptr(), perm.mode) }).map(|_| ())) } pub fn rmdir(p: &Path) -> io::Result<()> { - let p = cstr(p)?; - cvt(unsafe { libc::rmdir(p.as_ptr()) })?; - Ok(()) + run_path_with_cstr(p, |p| cvt(unsafe { libc::rmdir(p.as_ptr()) }).map(|_| ())) } pub fn readlink(p: &Path) -> io::Result<PathBuf> { - let c_path = cstr(p)?; - let p = c_path.as_ptr(); + run_path_with_cstr(p, |c_path| { + let p = c_path.as_ptr(); - let mut buf = Vec::with_capacity(256); + let mut buf = Vec::with_capacity(256); - loop { - let buf_read = - cvt(unsafe { libc::readlink(p, buf.as_mut_ptr() as *mut _, buf.capacity()) })? as usize; + loop { + let buf_read = + cvt(unsafe { libc::readlink(p, buf.as_mut_ptr() as *mut _, buf.capacity()) })? + as usize; - unsafe { - buf.set_len(buf_read); - } + unsafe { + buf.set_len(buf_read); + } - if buf_read != buf.capacity() { - buf.shrink_to_fit(); + if buf_read != buf.capacity() { + buf.shrink_to_fit(); - return Ok(PathBuf::from(OsString::from_vec(buf))); - } + return Ok(PathBuf::from(OsString::from_vec(buf))); + } - // Trigger the internal buffer resizing logic of `Vec` by requiring - // more space than the current capacity. The length is guaranteed to be - // the same as the capacity due to the if statement above. - buf.reserve(1); - } + // Trigger the internal buffer resizing logic of `Vec` by requiring + // more space than the current capacity. The length is guaranteed to be + // the same as the capacity due to the if statement above. + buf.reserve(1); + } + }) } pub fn symlink(original: &Path, link: &Path) -> io::Result<()> { - let original = cstr(original)?; - let link = cstr(link)?; - cvt(unsafe { libc::symlink(original.as_ptr(), link.as_ptr()) })?; - Ok(()) + run_path_with_cstr(original, |original| { + run_path_with_cstr(link, |link| { + cvt(unsafe { libc::symlink(original.as_ptr(), link.as_ptr()) }).map(|_| ()) + }) + }) } pub fn link(original: &Path, link: &Path) -> io::Result<()> { - let original = cstr(original)?; - let link = cstr(link)?; - cfg_if::cfg_if! { - if #[cfg(any(target_os = "vxworks", target_os = "redox", target_os = "android", target_os = "espidf", target_os = "horizon"))] { - // VxWorks, Redox and ESP-IDF lack `linkat`, so use `link` instead. POSIX leaves - // it implementation-defined whether `link` follows symlinks, so rely on the - // `symlink_hard_link` test in library/std/src/fs/tests.rs to check the behavior. - // Android has `linkat` on newer versions, but we happen to know `link` - // always has the correct behavior, so it's here as well. - cvt(unsafe { libc::link(original.as_ptr(), link.as_ptr()) })?; - } else if #[cfg(target_os = "macos")] { - // On MacOS, older versions (<=10.9) lack support for linkat while newer - // versions have it. We want to use linkat if it is available, so we use weak! - // to check. `linkat` is preferable to `link` because it gives us a flag to - // specify how symlinks should be handled. We pass 0 as the flags argument, - // meaning it shouldn't follow symlinks. - weak!(fn linkat(c_int, *const c_char, c_int, *const c_char, c_int) -> c_int); - - if let Some(f) = linkat.get() { - cvt(unsafe { f(libc::AT_FDCWD, original.as_ptr(), libc::AT_FDCWD, link.as_ptr(), 0) })?; - } else { - cvt(unsafe { libc::link(original.as_ptr(), link.as_ptr()) })?; - }; - } else { - // Where we can, use `linkat` instead of `link`; see the comment above - // this one for details on why. - cvt(unsafe { libc::linkat(libc::AT_FDCWD, original.as_ptr(), libc::AT_FDCWD, link.as_ptr(), 0) })?; - } - } - Ok(()) + run_path_with_cstr(original, |original| { + run_path_with_cstr(link, |link| { + cfg_if::cfg_if! { + if #[cfg(any(target_os = "vxworks", target_os = "redox", target_os = "android", target_os = "espidf", target_os = "horizon"))] { + // VxWorks, Redox and ESP-IDF lack `linkat`, so use `link` instead. POSIX leaves + // it implementation-defined whether `link` follows symlinks, so rely on the + // `symlink_hard_link` test in library/std/src/fs/tests.rs to check the behavior. + // Android has `linkat` on newer versions, but we happen to know `link` + // always has the correct behavior, so it's here as well. + cvt(unsafe { libc::link(original.as_ptr(), link.as_ptr()) })?; + } else if #[cfg(target_os = "macos")] { + // On MacOS, older versions (<=10.9) lack support for linkat while newer + // versions have it. We want to use linkat if it is available, so we use weak! + // to check. `linkat` is preferable to `link` because it gives us a flag to + // specify how symlinks should be handled. We pass 0 as the flags argument, + // meaning it shouldn't follow symlinks. + weak!(fn linkat(c_int, *const c_char, c_int, *const c_char, c_int) -> c_int); + + if let Some(f) = linkat.get() { + cvt(unsafe { f(libc::AT_FDCWD, original.as_ptr(), libc::AT_FDCWD, link.as_ptr(), 0) })?; + } else { + cvt(unsafe { libc::link(original.as_ptr(), link.as_ptr()) })?; + }; + } else { + // Where we can, use `linkat` instead of `link`; see the comment above + // this one for details on why. + cvt(unsafe { libc::linkat(libc::AT_FDCWD, original.as_ptr(), libc::AT_FDCWD, link.as_ptr(), 0) })?; + } + } + Ok(()) + }) + }) } pub fn stat(p: &Path) -> io::Result<FileAttr> { - let p = cstr(p)?; - - cfg_has_statx! { - if let Some(ret) = unsafe { try_statx( - libc::AT_FDCWD, - p.as_ptr(), - libc::AT_STATX_SYNC_AS_STAT, - libc::STATX_ALL, - ) } { - return ret; + run_path_with_cstr(p, |p| { + cfg_has_statx! { + if let Some(ret) = unsafe { try_statx( + libc::AT_FDCWD, + p.as_ptr(), + libc::AT_STATX_SYNC_AS_STAT, + libc::STATX_ALL, + ) } { + return ret; + } } - } - let mut stat: stat64 = unsafe { mem::zeroed() }; - cvt(unsafe { stat64(p.as_ptr(), &mut stat) })?; - Ok(FileAttr::from_stat64(stat)) + let mut stat: stat64 = unsafe { mem::zeroed() }; + cvt(unsafe { stat64(p.as_ptr(), &mut stat) })?; + Ok(FileAttr::from_stat64(stat)) + }) } pub fn lstat(p: &Path) -> io::Result<FileAttr> { - let p = cstr(p)?; - - cfg_has_statx! { - if let Some(ret) = unsafe { try_statx( - libc::AT_FDCWD, - p.as_ptr(), - libc::AT_SYMLINK_NOFOLLOW | libc::AT_STATX_SYNC_AS_STAT, - libc::STATX_ALL, - ) } { - return ret; + run_path_with_cstr(p, |p| { + cfg_has_statx! { + if let Some(ret) = unsafe { try_statx( + libc::AT_FDCWD, + p.as_ptr(), + libc::AT_SYMLINK_NOFOLLOW | libc::AT_STATX_SYNC_AS_STAT, + libc::STATX_ALL, + ) } { + return ret; + } } - } - let mut stat: stat64 = unsafe { mem::zeroed() }; - cvt(unsafe { lstat64(p.as_ptr(), &mut stat) })?; - Ok(FileAttr::from_stat64(stat)) + let mut stat: stat64 = unsafe { mem::zeroed() }; + cvt(unsafe { lstat64(p.as_ptr(), &mut stat) })?; + Ok(FileAttr::from_stat64(stat)) + }) } pub fn canonicalize(p: &Path) -> io::Result<PathBuf> { - let path = CString::new(p.as_os_str().as_bytes())?; - let buf; - unsafe { - let r = libc::realpath(path.as_ptr(), ptr::null_mut()); - if r.is_null() { - return Err(io::Error::last_os_error()); - } - buf = CStr::from_ptr(r).to_bytes().to_vec(); - libc::free(r as *mut _); + let r = run_path_with_cstr(p, |path| unsafe { + Ok(libc::realpath(path.as_ptr(), ptr::null_mut())) + })?; + if r.is_null() { + return Err(io::Error::last_os_error()); } - Ok(PathBuf::from(OsString::from_vec(buf))) + Ok(PathBuf::from(OsString::from_vec(unsafe { + let buf = CStr::from_ptr(r).to_bytes().to_vec(); + libc::free(r as *mut _); + buf + }))) } fn open_from(from: &Path) -> io::Result<(crate::fs::File, crate::fs::Metadata)> { @@ -1609,9 +1653,9 @@ pub fn copy(from: &Path, to: &Path) -> io::Result<u64> { // Opportunistically attempt to create a copy-on-write clone of `from` // using `fclonefileat`. if HAS_FCLONEFILEAT.load(Ordering::Relaxed) { - let to = cstr(to)?; - let clonefile_result = - cvt(unsafe { fclonefileat(reader.as_raw_fd(), libc::AT_FDCWD, to.as_ptr(), 0) }); + let clonefile_result = run_path_with_cstr(to, |to| { + cvt(unsafe { fclonefileat(reader.as_raw_fd(), libc::AT_FDCWD, to.as_ptr(), 0) }) + }); match clonefile_result { Ok(_) => return Ok(reader_metadata.len()), Err(err) => match err.raw_os_error() { @@ -1655,9 +1699,10 @@ pub fn copy(from: &Path, to: &Path) -> io::Result<u64> { } pub fn chown(path: &Path, uid: u32, gid: u32) -> io::Result<()> { - let path = cstr(path)?; - cvt(unsafe { libc::chown(path.as_ptr(), uid as libc::uid_t, gid as libc::gid_t) })?; - Ok(()) + run_path_with_cstr(path, |path| { + cvt(unsafe { libc::chown(path.as_ptr(), uid as libc::uid_t, gid as libc::gid_t) }) + .map(|_| ()) + }) } pub fn fchown(fd: c_int, uid: u32, gid: u32) -> io::Result<()> { @@ -1666,16 +1711,15 @@ pub fn fchown(fd: c_int, uid: u32, gid: u32) -> io::Result<()> { } pub fn lchown(path: &Path, uid: u32, gid: u32) -> io::Result<()> { - let path = cstr(path)?; - cvt(unsafe { libc::lchown(path.as_ptr(), uid as libc::uid_t, gid as libc::gid_t) })?; - Ok(()) + run_path_with_cstr(path, |path| { + cvt(unsafe { libc::lchown(path.as_ptr(), uid as libc::uid_t, gid as libc::gid_t) }) + .map(|_| ()) + }) } #[cfg(not(any(target_os = "fuchsia", target_os = "vxworks")))] pub fn chroot(dir: &Path) -> io::Result<()> { - let dir = cstr(dir)?; - cvt(unsafe { libc::chroot(dir.as_ptr()) })?; - Ok(()) + run_path_with_cstr(dir, |dir| cvt(unsafe { libc::chroot(dir.as_ptr()) }).map(|_| ())) } pub use remove_dir_impl::remove_dir_all; @@ -1689,13 +1733,14 @@ mod remove_dir_impl { // Modern implementation using openat(), unlinkat() and fdopendir() #[cfg(not(any(target_os = "redox", target_os = "espidf", target_os = "horizon", miri)))] mod remove_dir_impl { - use super::{cstr, lstat, Dir, DirEntry, InnerReadDir, ReadDir}; + use super::{lstat, Dir, DirEntry, InnerReadDir, ReadDir}; use crate::ffi::CStr; use crate::io; use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd}; use crate::os::unix::prelude::{OwnedFd, RawFd}; use crate::path::{Path, PathBuf}; use crate::sync::Arc; + use crate::sys::common::small_c_string::run_path_with_cstr; use crate::sys::{cvt, cvt_r}; #[cfg(not(all(target_os = "macos", not(target_arch = "aarch64")),))] @@ -1862,7 +1907,7 @@ mod remove_dir_impl { if attr.file_type().is_symlink() { crate::fs::remove_file(p) } else { - remove_dir_all_recursive(None, &cstr(p)?) + run_path_with_cstr(p, |p| remove_dir_all_recursive(None, &p)) } } diff --git a/library/std/src/sys/unix/io.rs b/library/std/src/sys/unix/io.rs index deb5ee76b..29c340dd3 100644 --- a/library/std/src/sys/unix/io.rs +++ b/library/std/src/sys/unix/io.rs @@ -1,4 +1,5 @@ use crate::marker::PhantomData; +use crate::os::fd::{AsFd, AsRawFd}; use crate::slice; use libc::{c_void, iovec}; @@ -74,3 +75,8 @@ impl<'a> IoSliceMut<'a> { unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) } } } + +pub fn is_terminal(fd: &impl AsFd) -> bool { + let fd = fd.as_fd(); + unsafe { libc::isatty(fd.as_raw_fd()) != 0 } +} diff --git a/library/std/src/sys/unix/kernel_copy.rs b/library/std/src/sys/unix/kernel_copy.rs index 8f7abb55e..94546ca09 100644 --- a/library/std/src/sys/unix/kernel_copy.rs +++ b/library/std/src/sys/unix/kernel_copy.rs @@ -20,7 +20,7 @@ //! Since those syscalls have requirements that cannot be fully checked in advance and //! gathering additional information about file descriptors would require additional syscalls //! anyway it simply attempts to use them one after another (guided by inaccurate hints) to -//! figure out which one works and and falls back to the generic read-write copy loop if none of them +//! figure out which one works and falls back to the generic read-write copy loop if none of them //! does. //! Once a working syscall is found for a pair of file descriptors it will be called in a loop //! until the copy operation is completed. diff --git a/library/std/src/sys/unix/locks/mod.rs b/library/std/src/sys/unix/locks/mod.rs index f5f92f693..9bb314b70 100644 --- a/library/std/src/sys/unix/locks/mod.rs +++ b/library/std/src/sys/unix/locks/mod.rs @@ -11,21 +11,21 @@ cfg_if::cfg_if! { mod futex_rwlock; mod futex_condvar; pub(crate) use futex_mutex::{Mutex, MovableMutex}; - pub(crate) use futex_rwlock::{RwLock, MovableRwLock}; + pub(crate) use futex_rwlock::MovableRwLock; pub(crate) use futex_condvar::MovableCondvar; } else if #[cfg(target_os = "fuchsia")] { mod fuchsia_mutex; mod futex_rwlock; mod futex_condvar; pub(crate) use fuchsia_mutex::{Mutex, MovableMutex}; - pub(crate) use futex_rwlock::{RwLock, MovableRwLock}; + pub(crate) use futex_rwlock::MovableRwLock; pub(crate) use futex_condvar::MovableCondvar; } else { mod pthread_mutex; mod pthread_rwlock; mod pthread_condvar; pub(crate) use pthread_mutex::{Mutex, MovableMutex}; - pub(crate) use pthread_rwlock::{RwLock, MovableRwLock}; + pub(crate) use pthread_rwlock::MovableRwLock; pub(crate) use pthread_condvar::MovableCondvar; } } diff --git a/library/std/src/sys/unix/mod.rs b/library/std/src/sys/unix/mod.rs index c84e292ea..9055a011c 100644 --- a/library/std/src/sys/unix/mod.rs +++ b/library/std/src/sys/unix/mod.rs @@ -163,17 +163,27 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) { // See the other file for docs. NOTE: Make sure to keep them in // sync! mod sigpipe { + pub const DEFAULT: u8 = 0; pub const INHERIT: u8 = 1; pub const SIG_IGN: u8 = 2; pub const SIG_DFL: u8 = 3; } - let handler = match sigpipe { - sigpipe::INHERIT => None, - sigpipe::SIG_IGN => Some(libc::SIG_IGN), - sigpipe::SIG_DFL => Some(libc::SIG_DFL), + let (sigpipe_attr_specified, handler) = match sigpipe { + sigpipe::DEFAULT => (false, Some(libc::SIG_IGN)), + sigpipe::INHERIT => (true, None), + sigpipe::SIG_IGN => (true, Some(libc::SIG_IGN)), + sigpipe::SIG_DFL => (true, Some(libc::SIG_DFL)), _ => unreachable!(), }; + // The bootstrap compiler doesn't know about sigpipe::DEFAULT, and always passes in + // SIG_IGN. This causes some tests to fail because they expect SIGPIPE to be reset to + // default on process spawning (which doesn't happen if #[unix_sigpipe] is specified). + // Since we can't differentiate between the cases here, treat SIG_IGN as DEFAULT + // unconditionally. + if sigpipe_attr_specified && !(cfg!(bootstrap) && sigpipe == sigpipe::SIG_IGN) { + UNIX_SIGPIPE_ATTR_SPECIFIED.store(true, crate::sync::atomic::Ordering::Relaxed); + } if let Some(handler) = handler { rtassert!(signal(libc::SIGPIPE, handler) != libc::SIG_ERR); } @@ -181,6 +191,26 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) { } } +// This is set (up to once) in reset_sigpipe. +#[cfg(not(any( + target_os = "espidf", + target_os = "emscripten", + target_os = "fuchsia", + target_os = "horizon" +)))] +static UNIX_SIGPIPE_ATTR_SPECIFIED: crate::sync::atomic::AtomicBool = + crate::sync::atomic::AtomicBool::new(false); + +#[cfg(not(any( + target_os = "espidf", + target_os = "emscripten", + target_os = "fuchsia", + target_os = "horizon" +)))] +pub(crate) fn unix_sigpipe_attr_specified() -> bool { + UNIX_SIGPIPE_ATTR_SPECIFIED.load(crate::sync::atomic::Ordering::Relaxed) +} + // SAFETY: must be called only once during runtime cleanup. // NOTE: this is not guaranteed to run, for example when the program aborts. pub unsafe fn cleanup() { @@ -352,16 +382,12 @@ cfg_if::cfg_if! { extern "C" {} } else if #[cfg(target_os = "macos")] { #[link(name = "System")] - // res_init and friends require -lresolv on macOS/iOS. - // See #41582 and https://blog.achernya.com/2013/03/os-x-has-silly-libsystem.html - #[link(name = "resolv")] extern "C" {} } else if #[cfg(any(target_os = "ios", target_os = "watchos"))] { #[link(name = "System")] #[link(name = "objc")] #[link(name = "Security", kind = "framework")] #[link(name = "Foundation", kind = "framework")] - #[link(name = "resolv")] extern "C" {} } else if #[cfg(target_os = "fuchsia")] { #[link(name = "zircon")] diff --git a/library/std/src/sys/unix/os.rs b/library/std/src/sys/unix/os.rs index 46545a083..2f2663db6 100644 --- a/library/std/src/sys/unix/os.rs +++ b/library/std/src/sys/unix/os.rs @@ -7,6 +7,7 @@ mod tests; use crate::os::unix::prelude::*; +use crate::convert::TryFrom; use crate::error::Error as StdError; use crate::ffi::{CStr, CString, OsStr, OsString}; use crate::fmt; @@ -17,10 +18,11 @@ use crate::path::{self, PathBuf}; use crate::ptr; use crate::slice; use crate::str; +use crate::sync::{PoisonError, RwLock}; +use crate::sys::common::small_c_string::{run_path_with_cstr, run_with_cstr}; use crate::sys::cvt; use crate::sys::fd; use crate::sys::memchr; -use crate::sys_common::rwlock::{StaticRwLock, StaticRwLockReadGuard}; use crate::vec; #[cfg(all(target_env = "gnu", not(target_os = "vxworks")))] @@ -125,7 +127,9 @@ pub fn error_string(errno: i32) -> String { } let p = p as *const _; - str::from_utf8(CStr::from_ptr(p).to_bytes()).unwrap().to_owned() + // We can't always expect a UTF-8 environment. When we don't get that luxury, + // it's better to give a low-quality error message than none at all. + String::from_utf8_lossy(CStr::from_ptr(p).to_bytes()).into() } } @@ -168,12 +172,8 @@ pub fn chdir(p: &path::Path) -> io::Result<()> { #[cfg(not(target_os = "espidf"))] pub fn chdir(p: &path::Path) -> io::Result<()> { - let p: &OsStr = p.as_ref(); - let p = CString::new(p.as_bytes())?; - if unsafe { libc::chdir(p.as_ptr()) } != 0 { - return Err(io::Error::last_os_error()); - } - Ok(()) + let result = run_path_with_cstr(p, |p| unsafe { Ok(libc::chdir(p.as_ptr())) })?; + if result == 0 { Ok(()) } else { Err(io::Error::last_os_error()) } } pub struct SplitPaths<'a> { @@ -501,10 +501,10 @@ pub unsafe fn environ() -> *mut *const *const c_char { ptr::addr_of_mut!(environ) } -static ENV_LOCK: StaticRwLock = StaticRwLock::new(); +static ENV_LOCK: RwLock<()> = RwLock::new(()); -pub fn env_read_lock() -> StaticRwLockReadGuard { - ENV_LOCK.read() +pub fn env_read_lock() -> impl Drop { + ENV_LOCK.read().unwrap_or_else(PoisonError::into_inner) } /// Returns a vector of (variable, value) byte-vector pairs for all the @@ -546,35 +546,32 @@ pub fn env() -> Env { pub fn getenv(k: &OsStr) -> Option<OsString> { // environment variables with a nul byte can't be set, so their value is // always None as well - let k = CString::new(k.as_bytes()).ok()?; - unsafe { + let s = run_with_cstr(k.as_bytes(), |k| { let _guard = env_read_lock(); - let s = libc::getenv(k.as_ptr()) as *const libc::c_char; - if s.is_null() { - None - } else { - Some(OsStringExt::from_vec(CStr::from_ptr(s).to_bytes().to_vec())) - } + Ok(unsafe { libc::getenv(k.as_ptr()) } as *const libc::c_char) + }) + .ok()?; + if s.is_null() { + None + } else { + Some(OsStringExt::from_vec(unsafe { CStr::from_ptr(s) }.to_bytes().to_vec())) } } pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> { - let k = CString::new(k.as_bytes())?; - let v = CString::new(v.as_bytes())?; - - unsafe { - let _guard = ENV_LOCK.write(); - cvt(libc::setenv(k.as_ptr(), v.as_ptr(), 1)).map(drop) - } + run_with_cstr(k.as_bytes(), |k| { + run_with_cstr(v.as_bytes(), |v| { + let _guard = ENV_LOCK.write(); + cvt(unsafe { libc::setenv(k.as_ptr(), v.as_ptr(), 1) }).map(drop) + }) + }) } pub fn unsetenv(n: &OsStr) -> io::Result<()> { - let nbuf = CString::new(n.as_bytes())?; - - unsafe { + run_with_cstr(n.as_bytes(), |nbuf| { let _guard = ENV_LOCK.write(); - cvt(libc::unsetenv(nbuf.as_ptr())).map(drop) - } + cvt(unsafe { libc::unsetenv(nbuf.as_ptr()) }).map(drop) + }) } #[cfg(not(target_os = "espidf"))] diff --git a/library/std/src/sys/unix/process/process_common.rs b/library/std/src/sys/unix/process/process_common.rs index 2834ee0ac..848adca78 100644 --- a/library/std/src/sys/unix/process/process_common.rs +++ b/library/std/src/sys/unix/process/process_common.rs @@ -39,10 +39,12 @@ cfg_if::cfg_if! { // https://github.com/aosp-mirror/platform_bionic/blob/ad8dcd6023294b646e5a8288c0ed431b0845da49/libc/include/android/legacy_signal_inlines.h cfg_if::cfg_if! { if #[cfg(target_os = "android")] { + #[allow(dead_code)] pub unsafe fn sigemptyset(set: *mut libc::sigset_t) -> libc::c_int { set.write_bytes(0u8, 1); return 0; } + #[allow(dead_code)] pub unsafe fn sigaddset(set: *mut libc::sigset_t, signum: libc::c_int) -> libc::c_int { use crate::{ diff --git a/library/std/src/sys/unix/process/process_common/tests.rs b/library/std/src/sys/unix/process/process_common/tests.rs index d176b3401..03631e4e3 100644 --- a/library/std/src/sys/unix/process/process_common/tests.rs +++ b/library/std/src/sys/unix/process/process_common/tests.rs @@ -31,41 +31,54 @@ macro_rules! t { ignore )] fn test_process_mask() { - unsafe { - // Test to make sure that a signal mask does not get inherited. - let mut cmd = Command::new(OsStr::new("cat")); - - let mut set = mem::MaybeUninit::<libc::sigset_t>::uninit(); - let mut old_set = mem::MaybeUninit::<libc::sigset_t>::uninit(); - t!(cvt(sigemptyset(set.as_mut_ptr()))); - t!(cvt(sigaddset(set.as_mut_ptr(), libc::SIGINT))); - t!(cvt_nz(libc::pthread_sigmask(libc::SIG_SETMASK, set.as_ptr(), old_set.as_mut_ptr()))); - - cmd.stdin(Stdio::MakePipe); - cmd.stdout(Stdio::MakePipe); - - let (mut cat, mut pipes) = t!(cmd.spawn(Stdio::Null, true)); - let stdin_write = pipes.stdin.take().unwrap(); - let stdout_read = pipes.stdout.take().unwrap(); - - t!(cvt_nz(libc::pthread_sigmask(libc::SIG_SETMASK, old_set.as_ptr(), ptr::null_mut()))); - - t!(cvt(libc::kill(cat.id() as libc::pid_t, libc::SIGINT))); - // We need to wait until SIGINT is definitely delivered. The - // easiest way is to write something to cat, and try to read it - // back: if SIGINT is unmasked, it'll get delivered when cat is - // next scheduled. - let _ = stdin_write.write(b"Hello"); - drop(stdin_write); - - // Either EOF or failure (EPIPE) is okay. - let mut buf = [0; 5]; - if let Ok(ret) = stdout_read.read(&mut buf) { - assert_eq!(ret, 0); + // Test to make sure that a signal mask *does* get inherited. + fn test_inner(mut cmd: Command) { + unsafe { + let mut set = mem::MaybeUninit::<libc::sigset_t>::uninit(); + let mut old_set = mem::MaybeUninit::<libc::sigset_t>::uninit(); + t!(cvt(sigemptyset(set.as_mut_ptr()))); + t!(cvt(sigaddset(set.as_mut_ptr(), libc::SIGINT))); + t!(cvt_nz(libc::pthread_sigmask( + libc::SIG_SETMASK, + set.as_ptr(), + old_set.as_mut_ptr() + ))); + + cmd.stdin(Stdio::MakePipe); + cmd.stdout(Stdio::MakePipe); + + let (mut cat, mut pipes) = t!(cmd.spawn(Stdio::Null, true)); + let stdin_write = pipes.stdin.take().unwrap(); + let stdout_read = pipes.stdout.take().unwrap(); + + t!(cvt_nz(libc::pthread_sigmask(libc::SIG_SETMASK, old_set.as_ptr(), ptr::null_mut()))); + + t!(cvt(libc::kill(cat.id() as libc::pid_t, libc::SIGINT))); + // We need to wait until SIGINT is definitely delivered. The + // easiest way is to write something to cat, and try to read it + // back: if SIGINT is unmasked, it'll get delivered when cat is + // next scheduled. + let _ = stdin_write.write(b"Hello"); + drop(stdin_write); + + // Exactly 5 bytes should be read. + let mut buf = [0; 5]; + let ret = t!(stdout_read.read(&mut buf)); + assert_eq!(ret, 5); + assert_eq!(&buf, b"Hello"); + + t!(cat.wait()); } - - t!(cat.wait()); } + + // A plain `Command::new` uses the posix_spawn path on many platforms. + let cmd = Command::new(OsStr::new("cat")); + test_inner(cmd); + + // Specifying `pre_exec` forces the fork/exec path. + let mut cmd = Command::new(OsStr::new("cat")); + unsafe { cmd.pre_exec(Box::new(|| Ok(()))) }; + test_inner(cmd); } #[test] diff --git a/library/std/src/sys/unix/process/process_fuchsia.rs b/library/std/src/sys/unix/process/process_fuchsia.rs index 73f5d3a61..66ea3db20 100644 --- a/library/std/src/sys/unix/process/process_fuchsia.rs +++ b/library/std/src/sys/unix/process/process_fuchsia.rs @@ -287,7 +287,7 @@ impl ExitStatus { // SuS and POSIX) say a wait status is, but Fuchsia apparently uses a u64, so it won't // necessarily fit. // - // It seems to me that that the right answer would be to provide std::os::fuchsia with its + // It seems to me that the right answer would be to provide std::os::fuchsia with its // own ExitStatusExt, rather that trying to provide a not very convincing imitation of // Unix. Ie, std::os::unix::process:ExitStatusExt ought not to exist on Fuchsia. But // fixing this up that is beyond the scope of my efforts now. diff --git a/library/std/src/sys/unix/process/process_unix.rs b/library/std/src/sys/unix/process/process_unix.rs index 26ae62817..56a805cef 100644 --- a/library/std/src/sys/unix/process/process_unix.rs +++ b/library/std/src/sys/unix/process/process_unix.rs @@ -2,7 +2,6 @@ use crate::fmt; use crate::io::{self, Error, ErrorKind}; use crate::mem; use crate::num::NonZeroI32; -use crate::ptr; use crate::sys; use crate::sys::cvt; use crate::sys::process::process_common::*; @@ -310,7 +309,7 @@ impl Command { //FIXME: Redox kernel does not support setgroups yet #[cfg(not(target_os = "redox"))] if libc::getuid() == 0 && self.get_groups().is_none() { - cvt(libc::setgroups(0, ptr::null()))?; + cvt(libc::setgroups(0, crate::ptr::null()))?; } cvt(libc::setuid(u as uid_t))?; } @@ -326,30 +325,26 @@ impl Command { // emscripten has no signal support. #[cfg(not(target_os = "emscripten"))] { - use crate::mem::MaybeUninit; - use crate::sys::cvt_nz; - // Reset signal handling so the child process starts in a - // standardized state. libstd ignores SIGPIPE, and signal-handling - // libraries often set a mask. Child processes inherit ignored - // signals and the signal mask from their parent, but most - // UNIX programs do not reset these things on their own, so we - // need to clean things up now to avoid confusing the program - // we're about to run. - let mut set = MaybeUninit::<libc::sigset_t>::uninit(); - cvt(sigemptyset(set.as_mut_ptr()))?; - cvt_nz(libc::pthread_sigmask(libc::SIG_SETMASK, set.as_ptr(), ptr::null_mut()))?; - - #[cfg(target_os = "android")] // see issue #88585 - { - let mut action: libc::sigaction = mem::zeroed(); - action.sa_sigaction = libc::SIG_DFL; - cvt(libc::sigaction(libc::SIGPIPE, &action, ptr::null_mut()))?; - } - #[cfg(not(target_os = "android"))] - { - let ret = sys::signal(libc::SIGPIPE, libc::SIG_DFL); - if ret == libc::SIG_ERR { - return Err(io::Error::last_os_error()); + // Inherit the signal mask from the parent rather than resetting it (i.e. do not call + // pthread_sigmask). + + // If #[unix_sigpipe] is specified, don't reset SIGPIPE to SIG_DFL. + // If #[unix_sigpipe] is not specified, reset SIGPIPE to SIG_DFL for backward compatibility. + // + // #[unix_sigpipe] is an opportunity to change the default here. + if !crate::sys::unix_sigpipe_attr_specified() { + #[cfg(target_os = "android")] // see issue #88585 + { + let mut action: libc::sigaction = mem::zeroed(); + action.sa_sigaction = libc::SIG_DFL; + cvt(libc::sigaction(libc::SIGPIPE, &action, crate::ptr::null_mut()))?; + } + #[cfg(not(target_os = "android"))] + { + let ret = sys::signal(libc::SIGPIPE, libc::SIG_DFL); + if ret == libc::SIG_ERR { + return Err(io::Error::last_os_error()); + } } } } @@ -411,7 +406,7 @@ impl Command { envp: Option<&CStringArray>, ) -> io::Result<Option<Process>> { use crate::mem::MaybeUninit; - use crate::sys::{self, cvt_nz}; + use crate::sys::{self, cvt_nz, unix_sigpipe_attr_specified}; if self.get_gid().is_some() || self.get_uid().is_some() @@ -531,13 +526,24 @@ impl Command { cvt_nz(libc::posix_spawnattr_setpgroup(attrs.0.as_mut_ptr(), pgroup))?; } - let mut set = MaybeUninit::<libc::sigset_t>::uninit(); - cvt(sigemptyset(set.as_mut_ptr()))?; - cvt_nz(libc::posix_spawnattr_setsigmask(attrs.0.as_mut_ptr(), set.as_ptr()))?; - cvt(sigaddset(set.as_mut_ptr(), libc::SIGPIPE))?; - cvt_nz(libc::posix_spawnattr_setsigdefault(attrs.0.as_mut_ptr(), set.as_ptr()))?; + // Inherit the signal mask from this process rather than resetting it (i.e. do not call + // posix_spawnattr_setsigmask). + + // If #[unix_sigpipe] is specified, don't reset SIGPIPE to SIG_DFL. + // If #[unix_sigpipe] is not specified, reset SIGPIPE to SIG_DFL for backward compatibility. + // + // #[unix_sigpipe] is an opportunity to change the default here. + if !unix_sigpipe_attr_specified() { + let mut default_set = MaybeUninit::<libc::sigset_t>::uninit(); + cvt(sigemptyset(default_set.as_mut_ptr()))?; + cvt(sigaddset(default_set.as_mut_ptr(), libc::SIGPIPE))?; + cvt_nz(libc::posix_spawnattr_setsigdefault( + attrs.0.as_mut_ptr(), + default_set.as_ptr(), + ))?; + flags |= libc::POSIX_SPAWN_SETSIGDEF; + } - flags |= libc::POSIX_SPAWN_SETSIGDEF | libc::POSIX_SPAWN_SETSIGMASK; cvt_nz(libc::posix_spawnattr_setflags(attrs.0.as_mut_ptr(), flags as _))?; // Make sure we synchronize access to the global `environ` resource @@ -822,14 +828,14 @@ impl crate::os::linux::process::ChildExt for crate::process::Child { self.handle .pidfd .as_ref() - .ok_or_else(|| Error::new(ErrorKind::Other, "No pidfd was created.")) + .ok_or_else(|| Error::new(ErrorKind::Uncategorized, "No pidfd was created.")) } fn take_pidfd(&mut self) -> io::Result<PidFd> { self.handle .pidfd .take() - .ok_or_else(|| Error::new(ErrorKind::Other, "No pidfd was created.")) + .ok_or_else(|| Error::new(ErrorKind::Uncategorized, "No pidfd was created.")) } } diff --git a/library/std/src/sys/unix/stdio.rs b/library/std/src/sys/unix/stdio.rs index 329f9433d..b3626c564 100644 --- a/library/std/src/sys/unix/stdio.rs +++ b/library/std/src/sys/unix/stdio.rs @@ -1,6 +1,6 @@ use crate::io::{self, IoSlice, IoSliceMut}; use crate::mem::ManuallyDrop; -use crate::os::unix::io::{AsFd, BorrowedFd, FromRawFd}; +use crate::os::unix::io::FromRawFd; use crate::sys::fd::FileDesc; pub struct Stdin(()); @@ -91,51 +91,3 @@ pub const STDIN_BUF_SIZE: usize = crate::sys_common::io::DEFAULT_BUF_SIZE; pub fn panic_output() -> Option<impl io::Write> { Some(Stderr::new()) } - -#[stable(feature = "io_safety", since = "1.63.0")] -impl AsFd for io::Stdin { - #[inline] - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(libc::STDIN_FILENO) } - } -} - -#[stable(feature = "io_safety", since = "1.63.0")] -impl<'a> AsFd for io::StdinLock<'a> { - #[inline] - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(libc::STDIN_FILENO) } - } -} - -#[stable(feature = "io_safety", since = "1.63.0")] -impl AsFd for io::Stdout { - #[inline] - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(libc::STDOUT_FILENO) } - } -} - -#[stable(feature = "io_safety", since = "1.63.0")] -impl<'a> AsFd for io::StdoutLock<'a> { - #[inline] - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(libc::STDOUT_FILENO) } - } -} - -#[stable(feature = "io_safety", since = "1.63.0")] -impl AsFd for io::Stderr { - #[inline] - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(libc::STDERR_FILENO) } - } -} - -#[stable(feature = "io_safety", since = "1.63.0")] -impl<'a> AsFd for io::StderrLock<'a> { - #[inline] - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(libc::STDERR_FILENO) } - } -} diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs index f6b627afc..c1d30dd9d 100644 --- a/library/std/src/sys/unix/thread.rs +++ b/library/std/src/sys/unix/thread.rs @@ -137,7 +137,9 @@ impl Thread { unsafe { // Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20. let name = truncate_cstr(name, TASK_COMM_LEN); - libc::pthread_setname_np(libc::pthread_self(), name.as_ptr()); + let res = libc::pthread_setname_np(libc::pthread_self(), name.as_ptr()); + // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. + debug_assert_eq!(res, 0); } } @@ -152,20 +154,22 @@ impl Thread { pub fn set_name(name: &CStr) { unsafe { let name = truncate_cstr(name, libc::MAXTHREADNAMESIZE); - libc::pthread_setname_np(name.as_ptr()); + let res = libc::pthread_setname_np(name.as_ptr()); + // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. + debug_assert_eq!(res, 0); } } #[cfg(target_os = "netbsd")] pub fn set_name(name: &CStr) { - use crate::ffi::CString; - let cname = CString::new(&b"%s"[..]).unwrap(); unsafe { - libc::pthread_setname_np( + let cname = CStr::from_bytes_with_nul_unchecked(b"%s\0".as_slice()); + let res = libc::pthread_setname_np( libc::pthread_self(), cname.as_ptr(), name.as_ptr() as *mut libc::c_void, ); + debug_assert_eq!(res, 0); } } @@ -178,9 +182,8 @@ impl Thread { } if let Some(f) = pthread_setname_np.get() { - unsafe { - f(libc::pthread_self(), name.as_ptr()); - } + let res = unsafe { f(libc::pthread_self(), name.as_ptr()) }; + debug_assert_eq!(res, 0); } } @@ -785,6 +788,16 @@ pub mod guard { const GUARD_PAGES: usize = 1; let guard = guardaddr..guardaddr + GUARD_PAGES * page_size; Some(guard) + } else if cfg!(target_os = "openbsd") { + // OpenBSD stack already includes a guard page, and stack is + // immutable. + // + // We'll just note where we expect rlimit to start + // faulting, so our handler can report "stack overflow", and + // trust that the kernel's own stack guard will work. + let stackptr = get_stack_start_aligned()?; + let stackaddr = stackptr.addr(); + Some(stackaddr - page_size..stackaddr) } else { // Reallocate the last page of the stack. // This ensures SIGBUS will be raised on diff --git a/library/std/src/sys/unix/thread_local_dtor.rs b/library/std/src/sys/unix/thread_local_dtor.rs index 6e8be2a91..d7fd2130f 100644 --- a/library/std/src/sys/unix/thread_local_dtor.rs +++ b/library/std/src/sys/unix/thread_local_dtor.rs @@ -17,6 +17,7 @@ target_os = "redox", target_os = "emscripten" ))] +#[cfg_attr(target_family = "wasm", allow(unused))] // might remain unused depending on target details (e.g. wasm32-unknown-emscripten) pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) { use crate::mem; use crate::sys_common::thread_local_dtor::register_dtor_fallback; diff --git a/library/std/src/sys/unix/thread_local_key.rs b/library/std/src/sys/unix/thread_local_key.rs index 2c5b94b1e..2b2d079ee 100644 --- a/library/std/src/sys/unix/thread_local_key.rs +++ b/library/std/src/sys/unix/thread_local_key.rs @@ -27,8 +27,3 @@ pub unsafe fn destroy(key: Key) { let r = libc::pthread_key_delete(key); debug_assert_eq!(r, 0); } - -#[inline] -pub fn requires_synchronized_create() -> bool { - false -} diff --git a/library/std/src/sys/unix/thread_parker/darwin.rs b/library/std/src/sys/unix/thread_parker/darwin.rs new file mode 100644 index 000000000..2f5356fe2 --- /dev/null +++ b/library/std/src/sys/unix/thread_parker/darwin.rs @@ -0,0 +1,131 @@ +//! Thread parking for Darwin-based systems. +//! +//! Darwin actually has futex syscalls (`__ulock_wait`/`__ulock_wake`), but they +//! cannot be used in `std` because they are non-public (their use will lead to +//! rejection from the App Store) and because they are only available starting +//! with macOS version 10.12, even though the minimum target version is 10.7. +//! +//! Therefore, we need to look for other synchronization primitives. Luckily, Darwin +//! supports semaphores, which allow us to implement the behaviour we need with +//! only one primitive (as opposed to a mutex-condvar pair). We use the semaphore +//! provided by libdispatch, as the underlying Mach semaphore is only dubiously +//! public. + +use crate::pin::Pin; +use crate::sync::atomic::{ + AtomicI8, + Ordering::{Acquire, Release}, +}; +use crate::time::Duration; + +type dispatch_semaphore_t = *mut crate::ffi::c_void; +type dispatch_time_t = u64; + +const DISPATCH_TIME_NOW: dispatch_time_t = 0; +const DISPATCH_TIME_FOREVER: dispatch_time_t = !0; + +// Contained in libSystem.dylib, which is linked by default. +extern "C" { + fn dispatch_time(when: dispatch_time_t, delta: i64) -> dispatch_time_t; + fn dispatch_semaphore_create(val: isize) -> dispatch_semaphore_t; + fn dispatch_semaphore_wait(dsema: dispatch_semaphore_t, timeout: dispatch_time_t) -> isize; + fn dispatch_semaphore_signal(dsema: dispatch_semaphore_t) -> isize; + fn dispatch_release(object: *mut crate::ffi::c_void); +} + +const EMPTY: i8 = 0; +const NOTIFIED: i8 = 1; +const PARKED: i8 = -1; + +pub struct Parker { + semaphore: dispatch_semaphore_t, + state: AtomicI8, +} + +unsafe impl Sync for Parker {} +unsafe impl Send for Parker {} + +impl Parker { + pub unsafe fn new(parker: *mut Parker) { + let semaphore = dispatch_semaphore_create(0); + assert!( + !semaphore.is_null(), + "failed to create dispatch semaphore for thread synchronization" + ); + parker.write(Parker { semaphore, state: AtomicI8::new(EMPTY) }) + } + + // Does not need `Pin`, but other implementation do. + pub unsafe fn park(self: Pin<&Self>) { + // The semaphore counter must be zero at this point, because unparking + // threads will not actually increase it until we signalled that we + // are waiting. + + // Change NOTIFIED to EMPTY and EMPTY to PARKED. + if self.state.fetch_sub(1, Acquire) == NOTIFIED { + return; + } + + // Another thread may increase the semaphore counter from this point on. + // If it is faster than us, we will decrement it again immediately below. + // If we are faster, we wait. + + // Ensure that the semaphore counter has actually been decremented, even + // if the call timed out for some reason. + while dispatch_semaphore_wait(self.semaphore, DISPATCH_TIME_FOREVER) != 0 {} + + // At this point, the semaphore counter is zero again. + + // We were definitely woken up, so we don't need to check the state. + // Still, we need to reset the state using a swap to observe the state + // change with acquire ordering. + self.state.swap(EMPTY, Acquire); + } + + // Does not need `Pin`, but other implementation do. + pub unsafe fn park_timeout(self: Pin<&Self>, dur: Duration) { + if self.state.fetch_sub(1, Acquire) == NOTIFIED { + return; + } + + let nanos = dur.as_nanos().try_into().unwrap_or(i64::MAX); + let timeout = dispatch_time(DISPATCH_TIME_NOW, nanos); + + let timeout = dispatch_semaphore_wait(self.semaphore, timeout) != 0; + + let state = self.state.swap(EMPTY, Acquire); + if state == NOTIFIED && timeout { + // If the state was NOTIFIED but semaphore_wait returned without + // decrementing the count because of a timeout, it means another + // thread is about to call semaphore_signal. We must wait for that + // to happen to ensure the semaphore count is reset. + while dispatch_semaphore_wait(self.semaphore, DISPATCH_TIME_FOREVER) != 0 {} + } else { + // Either a timeout occurred and we reset the state before any thread + // tried to wake us up, or we were woken up and reset the state, + // making sure to observe the state change with acquire ordering. + // Either way, the semaphore counter is now zero again. + } + } + + // Does not need `Pin`, but other implementation do. + pub fn unpark(self: Pin<&Self>) { + let state = self.state.swap(NOTIFIED, Release); + if state == PARKED { + unsafe { + dispatch_semaphore_signal(self.semaphore); + } + } + } +} + +impl Drop for Parker { + fn drop(&mut self) { + // SAFETY: + // We always ensure that the semaphore count is reset, so this will + // never cause an exception. + unsafe { + dispatch_release(self.semaphore); + } + } +} diff --git a/library/std/src/sys/unix/thread_parker/mod.rs b/library/std/src/sys/unix/thread_parker/mod.rs index e2453580d..35f1e68a8 100644 --- a/library/std/src/sys/unix/thread_parker/mod.rs +++ b/library/std/src/sys/unix/thread_parker/mod.rs @@ -11,7 +11,18 @@ )))] cfg_if::cfg_if! { - if #[cfg(target_os = "netbsd")] { + if #[cfg(all( + any( + target_os = "macos", + target_os = "ios", + target_os = "watchos", + target_os = "tvos", + ), + not(miri), + ))] { + mod darwin; + pub use darwin::Parker; + } else if #[cfg(target_os = "netbsd")] { mod netbsd; pub use netbsd::Parker; } else { diff --git a/library/std/src/sys/unix/time.rs b/library/std/src/sys/unix/time.rs index dff973f59..cca9c6767 100644 --- a/library/std/src/sys/unix/time.rs +++ b/library/std/src/sys/unix/time.rs @@ -7,6 +7,12 @@ const NSEC_PER_SEC: u64 = 1_000_000_000; pub const UNIX_EPOCH: SystemTime = SystemTime { t: Timespec::zero() }; #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +#[repr(transparent)] +#[rustc_layout_scalar_valid_range_start(0)] +#[rustc_layout_scalar_valid_range_end(999_999_999)] +struct Nanoseconds(u32); + +#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] pub struct SystemTime { pub(in crate::sys::unix) t: Timespec, } @@ -14,7 +20,7 @@ pub struct SystemTime { #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] pub(in crate::sys::unix) struct Timespec { tv_sec: i64, - tv_nsec: i64, + tv_nsec: Nanoseconds, } impl SystemTime { @@ -46,18 +52,20 @@ impl fmt::Debug for SystemTime { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("SystemTime") .field("tv_sec", &self.t.tv_sec) - .field("tv_nsec", &self.t.tv_nsec) + .field("tv_nsec", &self.t.tv_nsec.0) .finish() } } impl Timespec { pub const fn zero() -> Timespec { - Timespec { tv_sec: 0, tv_nsec: 0 } + Timespec::new(0, 0) } - fn new(tv_sec: i64, tv_nsec: i64) -> Timespec { - Timespec { tv_sec, tv_nsec } + const fn new(tv_sec: i64, tv_nsec: i64) -> Timespec { + assert!(tv_nsec >= 0 && tv_nsec < NSEC_PER_SEC as i64); + // SAFETY: The assert above checks tv_nsec is within the valid range + Timespec { tv_sec, tv_nsec: unsafe { Nanoseconds(tv_nsec as u32) } } } pub fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> { @@ -75,12 +83,12 @@ impl Timespec { // // Ideally this code could be rearranged such that it more // directly expresses the lower-cost behavior we want from it. - let (secs, nsec) = if self.tv_nsec >= other.tv_nsec { - ((self.tv_sec - other.tv_sec) as u64, (self.tv_nsec - other.tv_nsec) as u32) + let (secs, nsec) = if self.tv_nsec.0 >= other.tv_nsec.0 { + ((self.tv_sec - other.tv_sec) as u64, self.tv_nsec.0 - other.tv_nsec.0) } else { ( (self.tv_sec - other.tv_sec - 1) as u64, - self.tv_nsec as u32 + (NSEC_PER_SEC as u32) - other.tv_nsec as u32, + self.tv_nsec.0 + (NSEC_PER_SEC as u32) - other.tv_nsec.0, ) }; @@ -102,7 +110,7 @@ impl Timespec { // Nano calculations can't overflow because nanos are <1B which fit // in a u32. - let mut nsec = other.subsec_nanos() + self.tv_nsec as u32; + let mut nsec = other.subsec_nanos() + self.tv_nsec.0; if nsec >= NSEC_PER_SEC as u32 { nsec -= NSEC_PER_SEC as u32; secs = secs.checked_add(1)?; @@ -118,7 +126,7 @@ impl Timespec { .and_then(|secs| self.tv_sec.checked_sub(secs))?; // Similar to above, nanos can't overflow. - let mut nsec = self.tv_nsec as i32 - other.subsec_nanos() as i32; + let mut nsec = self.tv_nsec.0 as i32 - other.subsec_nanos() as i32; if nsec < 0 { nsec += NSEC_PER_SEC as i32; secs = secs.checked_sub(1)?; @@ -130,7 +138,7 @@ impl Timespec { pub fn to_timespec(&self) -> Option<libc::timespec> { Some(libc::timespec { tv_sec: self.tv_sec.try_into().ok()?, - tv_nsec: self.tv_nsec.try_into().ok()?, + tv_nsec: self.tv_nsec.0.try_into().ok()?, }) } } @@ -293,7 +301,7 @@ mod inner { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("Instant") .field("tv_sec", &self.t.tv_sec) - .field("tv_nsec", &self.t.tv_nsec) + .field("tv_nsec", &self.t.tv_nsec.0) .finish() } } @@ -334,7 +342,7 @@ mod inner { let mut t = MaybeUninit::uninit(); cvt(unsafe { clock_gettime64(clock, t.as_mut_ptr()) }).unwrap(); let t = unsafe { t.assume_init() }; - return Timespec { tv_sec: t.tv_sec, tv_nsec: t.tv_nsec as i64 }; + return Timespec::new(t.tv_sec, t.tv_nsec as i64); } } |