21c29b1e95
If pthread mutex initialization fails, the failure will go unnoticed unless debug assertions are enabled. Any subsequent use of mutex will also silently fail, since return values from lock & unlock operations are similarly checked only through debug assertions. In some implementations the mutex initialization requires a memory allocation and so it does fail in practice. Check that initialization succeeds to ensure that mutex guarantees mutual exclusion.
237 lines
7.8 KiB
Rust
237 lines
7.8 KiB
Rust
#![allow(missing_docs, nonstandard_style)]
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use crate::io::ErrorKind;
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#[cfg(any(doc, target_os = "linux"))]
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pub use crate::os::linux as platform;
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#[cfg(all(not(doc), target_os = "android"))]
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pub use crate::os::android as platform;
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#[cfg(all(not(doc), target_os = "dragonfly"))]
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pub use crate::os::dragonfly as platform;
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#[cfg(all(not(doc), target_os = "emscripten"))]
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pub use crate::os::emscripten as platform;
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#[cfg(all(not(doc), target_os = "freebsd"))]
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pub use crate::os::freebsd as platform;
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#[cfg(all(not(doc), target_os = "fuchsia"))]
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pub use crate::os::fuchsia as platform;
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#[cfg(all(not(doc), target_os = "haiku"))]
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pub use crate::os::haiku as platform;
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#[cfg(all(not(doc), target_os = "illumos"))]
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pub use crate::os::illumos as platform;
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#[cfg(all(not(doc), target_os = "ios"))]
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pub use crate::os::ios as platform;
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#[cfg(all(not(doc), target_os = "l4re"))]
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pub use crate::os::linux as platform;
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#[cfg(all(not(doc), target_os = "macos"))]
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pub use crate::os::macos as platform;
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#[cfg(all(not(doc), target_os = "netbsd"))]
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pub use crate::os::netbsd as platform;
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#[cfg(all(not(doc), target_os = "openbsd"))]
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pub use crate::os::openbsd as platform;
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#[cfg(all(not(doc), target_os = "redox"))]
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pub use crate::os::redox as platform;
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#[cfg(all(not(doc), target_os = "solaris"))]
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pub use crate::os::solaris as platform;
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pub use self::rand::hashmap_random_keys;
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pub use libc::strlen;
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#[macro_use]
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pub mod weak;
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pub mod alloc;
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pub mod android;
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pub mod args;
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pub mod cmath;
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pub mod condvar;
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pub mod env;
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pub mod ext;
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pub mod fd;
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pub mod fs;
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pub mod futex;
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pub mod io;
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#[cfg(target_os = "l4re")]
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mod l4re;
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pub mod memchr;
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pub mod mutex;
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#[cfg(not(target_os = "l4re"))]
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pub mod net;
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#[cfg(target_os = "l4re")]
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pub use self::l4re::net;
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pub mod os;
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pub mod path;
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pub mod pipe;
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pub mod process;
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pub mod rand;
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pub mod rwlock;
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pub mod stack_overflow;
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pub mod stdio;
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pub mod thread;
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pub mod thread_local_dtor;
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pub mod thread_local_key;
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pub mod time;
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pub use crate::sys_common::os_str_bytes as os_str;
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#[cfg(not(test))]
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pub fn init() {
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// The standard streams might be closed on application startup. To prevent
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// std::io::{stdin, stdout,stderr} objects from using other unrelated file
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// resources opened later, we reopen standards streams when they are closed.
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unsafe {
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sanitize_standard_fds();
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}
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// By default, some platforms will send a *signal* when an EPIPE error
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// would otherwise be delivered. This runtime doesn't install a SIGPIPE
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// handler, causing it to kill the program, which isn't exactly what we
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// want!
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//
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// Hence, we set SIGPIPE to ignore when the program starts up in order
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// to prevent this problem.
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unsafe {
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reset_sigpipe();
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}
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cfg_if::cfg_if! {
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if #[cfg(miri)] {
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// The standard fds are always available in Miri.
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unsafe fn sanitize_standard_fds() {}
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} else if #[cfg(not(any(
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target_os = "emscripten",
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target_os = "fuchsia",
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// The poll on Darwin doesn't set POLLNVAL for closed fds.
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target_os = "macos",
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target_os = "ios",
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target_os = "redox",
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)))] {
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// In the case when all file descriptors are open, the poll has been
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// observed to perform better than fcntl (on GNU/Linux).
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unsafe fn sanitize_standard_fds() {
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use crate::sys::os::errno;
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let pfds: &mut [_] = &mut [
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libc::pollfd { fd: 0, events: 0, revents: 0 },
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libc::pollfd { fd: 1, events: 0, revents: 0 },
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libc::pollfd { fd: 2, events: 0, revents: 0 },
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];
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while libc::poll(pfds.as_mut_ptr(), 3, 0) == -1 {
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if errno() == libc::EINTR {
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continue;
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}
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libc::abort();
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}
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for pfd in pfds {
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if pfd.revents & libc::POLLNVAL == 0 {
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continue;
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}
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if libc::open("/dev/null\0".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
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// If the stream is closed but we failed to reopen it, abort the
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// process. Otherwise we wouldn't preserve the safety of
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// operations on the corresponding Rust object Stdin, Stdout, or
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// Stderr.
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libc::abort();
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}
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}
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}
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} else if #[cfg(any(target_os = "macos", target_os = "ios", target_os = "redox"))] {
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unsafe fn sanitize_standard_fds() {
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use crate::sys::os::errno;
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for fd in 0..3 {
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if libc::fcntl(fd, libc::F_GETFD) == -1 && errno() == libc::EBADF {
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if libc::open("/dev/null\0".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
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libc::abort();
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}
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}
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}
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}
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} else {
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unsafe fn sanitize_standard_fds() {}
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}
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}
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#[cfg(not(any(target_os = "emscripten", target_os = "fuchsia")))]
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unsafe fn reset_sigpipe() {
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assert!(signal(libc::SIGPIPE, libc::SIG_IGN) != libc::SIG_ERR);
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}
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#[cfg(any(target_os = "emscripten", target_os = "fuchsia"))]
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unsafe fn reset_sigpipe() {}
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}
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#[cfg(target_os = "android")]
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pub use crate::sys::android::signal;
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#[cfg(not(target_os = "android"))]
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pub use libc::signal;
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pub fn decode_error_kind(errno: i32) -> ErrorKind {
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match errno as libc::c_int {
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libc::ECONNREFUSED => ErrorKind::ConnectionRefused,
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libc::ECONNRESET => ErrorKind::ConnectionReset,
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libc::EPERM | libc::EACCES => ErrorKind::PermissionDenied,
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libc::EPIPE => ErrorKind::BrokenPipe,
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libc::ENOTCONN => ErrorKind::NotConnected,
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libc::ECONNABORTED => ErrorKind::ConnectionAborted,
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libc::EADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
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libc::EADDRINUSE => ErrorKind::AddrInUse,
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libc::ENOENT => ErrorKind::NotFound,
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libc::EINTR => ErrorKind::Interrupted,
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libc::EINVAL => ErrorKind::InvalidInput,
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libc::ETIMEDOUT => ErrorKind::TimedOut,
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libc::EEXIST => ErrorKind::AlreadyExists,
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// These two constants can have the same value on some systems,
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// but different values on others, so we can't use a match
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// clause
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x if x == libc::EAGAIN || x == libc::EWOULDBLOCK => ErrorKind::WouldBlock,
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_ => ErrorKind::Other,
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}
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}
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#[doc(hidden)]
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pub trait IsMinusOne {
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fn is_minus_one(&self) -> bool;
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}
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macro_rules! impl_is_minus_one {
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($($t:ident)*) => ($(impl IsMinusOne for $t {
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fn is_minus_one(&self) -> bool {
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*self == -1
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}
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})*)
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}
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impl_is_minus_one! { i8 i16 i32 i64 isize }
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pub fn cvt<T: IsMinusOne>(t: T) -> crate::io::Result<T> {
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if t.is_minus_one() { Err(crate::io::Error::last_os_error()) } else { Ok(t) }
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}
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pub fn cvt_r<T, F>(mut f: F) -> crate::io::Result<T>
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where
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T: IsMinusOne,
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F: FnMut() -> T,
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{
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loop {
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match cvt(f()) {
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Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
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other => return other,
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}
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}
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}
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pub fn cvt_nz(error: libc::c_int) -> crate::io::Result<()> {
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if error == 0 { Ok(()) } else { Err(crate::io::Error::from_raw_os_error(error)) }
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}
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// On Unix-like platforms, libc::abort will unregister signal handlers
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// including the SIGABRT handler, preventing the abort from being blocked, and
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// fclose streams, with the side effect of flushing them so libc buffered
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// output will be printed. Additionally the shell will generally print a more
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// understandable error message like "Abort trap" rather than "Illegal
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// instruction" that intrinsics::abort would cause, as intrinsics::abort is
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// implemented as an illegal instruction.
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pub fn abort_internal() -> ! {
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unsafe { libc::abort() }
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}
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