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Diffstat (limited to 'vendor/rustix/src/stdio.rs')
| -rw-r--r-- | vendor/rustix/src/stdio.rs | 511 |
1 files changed, 511 insertions, 0 deletions
diff --git a/vendor/rustix/src/stdio.rs b/vendor/rustix/src/stdio.rs new file mode 100644 index 000000000..278aba06c --- /dev/null +++ b/vendor/rustix/src/stdio.rs @@ -0,0 +1,511 @@ +//! Functions returning the stdio file descriptors. +//! +//! # Safety +//! +//! These access the file descriptors by absolute index value, and nothing +//! prevents them from being closed and reused. They should only be used in +//! `main` or other situations where one is in control of the process' +//! stdio streams. +#![allow(unsafe_code)] + +use crate::backend; +use crate::fd::OwnedFd; +use backend::c; +use backend::fd::{BorrowedFd, FromRawFd, RawFd}; + +#[cfg(not(any(windows, target_os = "wasi")))] +use {crate::io, backend::fd::AsFd, core::mem::forget}; + +/// `STDIN_FILENO`—Standard input, borrowed. +/// +/// In `std`-using configurations, this is a safe function, because the +/// standard library already assumes that the stdin file descriptor is always +/// valid. In `no_std` configurations, it is `unsafe`. +/// +/// # Warning +/// +/// This function allows reading directly from stdin without coordinating +/// with the buffering performed by [`std::io::Stdin`], so it could cause +/// corrupted input. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdin.4 +/// [OpenBSD]: https://man.openbsd.org/stdin.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdin +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin +#[cfg(feature = "std")] +#[doc(alias = "STDIN_FILENO")] +#[inline] +pub const fn stdin() -> BorrowedFd<'static> { + // SAFETY: When "std" is enabled, the standard library assumes that the + // stdio file descriptors are all valid. + unsafe { BorrowedFd::borrow_raw(c::STDIN_FILENO as RawFd) } +} + +/// `STDIN_FILENO`—Standard input, borrowed. +/// +/// In `std`-using configurations, this is a safe function, because the +/// standard library already assumes that the stdin file descriptor is always +/// valid. In `no_std` configurations, it is `unsafe`. +/// +/// # Safety +/// +/// In `no_std` configurations, the stdin file descriptor can be closed, +/// potentially on other threads, in which case the file descriptor index +/// value could be dynamically reused for other purposes, potentially on +/// different threads. +/// +/// # Warning +/// +/// This function allows reading directly from stdin without coordinating +/// with the buffering performed by [`std::io::Stdin`], so it could cause +/// corrupted input. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdin.4 +/// [OpenBSD]: https://man.openbsd.org/stdin.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdin +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin +#[cfg(not(feature = "std"))] +#[doc(alias = "STDIN_FILENO")] +#[inline] +pub const unsafe fn stdin() -> BorrowedFd<'static> { + BorrowedFd::borrow_raw(c::STDIN_FILENO as RawFd) +} + +/// `STDIN_FILENO`—Standard input, owned. +/// +/// This is similar to [`stdin`], however it returns an `OwnedFd` which closes +/// standard input when it is dropped. +/// +/// # Safety +/// +/// Safe `std`-using Rust code is permitted to assume that the stdin file +/// descriptor is always valid. This function returns an `OwnedFd` which will +/// close the stdin file descriptor when dropped. +/// +/// # Warning +/// +/// This has the same hazards as [`stdin`]. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdin.4 +/// [OpenBSD]: https://man.openbsd.org/stdin.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdin +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin +#[doc(alias = "STDIN_FILENO")] +#[inline] +pub unsafe fn take_stdin() -> OwnedFd { + backend::fd::OwnedFd::from_raw_fd(c::STDIN_FILENO as RawFd) +} + +/// `STDOUT_FILENO`—Standard output, borrowed. +/// +/// In `std`-using configurations, this is a safe function, because the +/// standard library already assumes that the stdout file descriptor is always +/// valid. In `no_std` configurations, it is `unsafe`. +/// +/// # Warning +/// +/// This function allows reading directly from stdout without coordinating +/// with the buffering performed by [`std::io::Stdout`], so it could cause +/// corrupted input. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdout.4 +/// [OpenBSD]: https://man.openbsd.org/stdout.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdout +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout +#[cfg(feature = "std")] +#[doc(alias = "STDOUT_FILENO")] +#[inline] +pub const fn stdout() -> BorrowedFd<'static> { + // SAFETY: When "std" is enabled, the standard library assumes that the + // stdio file descriptors are all valid. + unsafe { BorrowedFd::borrow_raw(c::STDOUT_FILENO as RawFd) } +} + +/// `STDOUT_FILENO`—Standard output, borrowed. +/// +/// In `std`-using configurations, this is a safe function, because the +/// standard library already assumes that the stdout file descriptor is always +/// valid. In `no_std` configurations, it is `unsafe`. +/// +/// # Safety +/// +/// In `no_std` configurations, the stdout file descriptor can be closed, +/// potentially on other threads, in which case the file descriptor index +/// value could be dynamically reused for other purposes, potentially on +/// different threads. +/// +/// # Warning +/// +/// This function allows reading directly from stdout without coordinating +/// with the buffering performed by [`std::io::Stdout`], so it could cause +/// corrupted input. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdout.4 +/// [OpenBSD]: https://man.openbsd.org/stdout.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdout +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout +#[cfg(not(feature = "std"))] +#[doc(alias = "STDOUT_FILENO")] +#[inline] +pub const unsafe fn stdout() -> BorrowedFd<'static> { + BorrowedFd::borrow_raw(c::STDOUT_FILENO as RawFd) +} + +/// `STDOUT_FILENO`—Standard output, owned. +/// +/// This is similar to [`stdout`], however it returns an `OwnedFd` which closes +/// standard output when it is dropped. +/// +/// # Safety +/// +/// Safe `std`-using Rust code is permitted to assume that the stdout file +/// descriptor is always valid. This function returns an `OwnedFd` which will +/// close the stdout file descriptor when dropped. +/// +/// # Warning +/// +/// This has the same hazards as [`stdout`]. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdout.4 +/// [OpenBSD]: https://man.openbsd.org/stdout.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdout +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout +#[doc(alias = "STDOUT_FILENO")] +#[inline] +pub unsafe fn take_stdout() -> OwnedFd { + backend::fd::OwnedFd::from_raw_fd(c::STDOUT_FILENO as RawFd) +} + +/// `STDERR_FILENO`—Standard error, borrowed. +/// +/// In `std`-using configurations, this is a safe function, because the +/// standard library already assumes that the stderr file descriptor is always +/// valid. In `no_std` configurations, it is `unsafe`. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stderr.4 +/// [OpenBSD]: https://man.openbsd.org/stderr.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stderr +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr +#[cfg(feature = "std")] +#[doc(alias = "STDERR_FILENO")] +#[inline] +pub const fn stderr() -> BorrowedFd<'static> { + // SAFETY: When "std" is enabled, the standard library assumes that the + // stdio file descriptors are all valid. + unsafe { BorrowedFd::borrow_raw(c::STDERR_FILENO as RawFd) } +} + +/// `STDERR_FILENO`—Standard error, borrowed. +/// +/// In `std`-using configurations, this is a safe function, because the +/// standard library already assumes that the stderr file descriptor is always +/// valid. In `no_std` configurations, it is `unsafe`. +/// +/// # Safety +/// +/// In `no_std` configurations, the stderr file descriptor can be closed, +/// potentially on other threads, in which case the file descriptor index +/// value could be dynamically reused for other purposes, potentially on +/// different threads. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stderr.4 +/// [OpenBSD]: https://man.openbsd.org/stderr.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stderr +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr +#[cfg(not(feature = "std"))] +#[doc(alias = "STDERR_FILENO")] +#[inline] +pub const unsafe fn stderr() -> BorrowedFd<'static> { + BorrowedFd::borrow_raw(c::STDERR_FILENO as RawFd) +} + +/// `STDERR_FILENO`—Standard error, owned. +/// +/// This is similar to [`stderr`], however it returns an `OwnedFd` which closes +/// standard output when it is dropped. +/// +/// # Safety +/// +/// Safe std-using Rust code is permitted to assume that the stderr file +/// descriptor is always valid. This function returns an `OwnedFd` which will +/// close the stderr file descriptor when dropped. +/// +/// # Other hazards +/// +/// This has the same hazards as [`stderr`]. +/// +/// And, when the `OwnedFd` is dropped, subsequent newly created file +/// descriptors may unknowingly reuse the stderr file descriptor number, which +/// may break common assumptions, so it should typically only be dropped at the +/// end of a program when no more file descriptors will be created. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stderr.4 +/// [OpenBSD]: https://man.openbsd.org/stderr.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stderr +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr +#[doc(alias = "STDERR_FILENO")] +#[inline] +pub unsafe fn take_stderr() -> OwnedFd { + backend::fd::OwnedFd::from_raw_fd(c::STDERR_FILENO as RawFd) +} + +/// `STDIN_FILENO`—Standard input, raw. +/// +/// This is similar to [`stdin`], however it returns a `RawFd`. +/// +/// # Other hazards +/// +/// This has the same hazards as [`stdin`]. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdin.4 +/// [OpenBSD]: https://man.openbsd.org/stdin.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdin +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin +#[doc(alias = "STDIN_FILENO")] +#[inline] +pub const fn raw_stdin() -> RawFd { + c::STDIN_FILENO as RawFd +} + +/// `STDOUT_FILENO`—Standard output, raw. +/// +/// This is similar to [`stdout`], however it returns a `RawFd`. +/// +/// # Other hazards +/// +/// This has the same hazards as [`stdout`]. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stdout.4 +/// [OpenBSD]: https://man.openbsd.org/stdout.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stdout +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout +#[doc(alias = "STDOUT_FILENO")] +#[inline] +pub const fn raw_stdout() -> RawFd { + c::STDOUT_FILENO as RawFd +} + +/// `STDERR_FILENO`—Standard error, raw. +/// +/// This is similar to [`stderr`], however it returns a `RawFd`. +/// +/// # Other hazards +/// +/// This has the same hazards as [`stderr`]. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// - [FreeBSD] +/// - [NetBSD] +/// - [OpenBSD] +/// - [DragonFly BSD] +/// - [illumos] +/// - [glibc] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html +/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html +/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4 +/// [NetBSD]: https://man.netbsd.org/stderr.4 +/// [OpenBSD]: https://man.openbsd.org/stderr.4 +/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr§ion=4 +/// [illumos]: https://illumos.org/man/4FS/stderr +/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr +#[doc(alias = "STDERR_FILENO")] +#[inline] +pub const fn raw_stderr() -> RawFd { + c::STDERR_FILENO as RawFd +} + +/// Utility function to safely `dup2` over stdin (fd 0). +#[cfg(not(any(windows, target_os = "wasi")))] +#[allow(clippy::mem_forget)] +#[inline] +pub fn dup2_stdin<Fd: AsFd>(fd: Fd) -> io::Result<()> { + // SAFETY: We pass the returned `OwnedFd` to `forget` so that it isn't + // dropped. + let mut target = unsafe { take_stdin() }; + backend::io::syscalls::dup2(fd.as_fd(), &mut target)?; + forget(target); + Ok(()) +} + +/// Utility function to safely `dup2` over stdout (fd 1). +#[cfg(not(any(windows, target_os = "wasi")))] +#[allow(clippy::mem_forget)] +#[inline] +pub fn dup2_stdout<Fd: AsFd>(fd: Fd) -> io::Result<()> { + // SAFETY: We pass the returned `OwnedFd` to `forget` so that it isn't + // dropped. + let mut target = unsafe { take_stdout() }; + backend::io::syscalls::dup2(fd.as_fd(), &mut target)?; + forget(target); + Ok(()) +} + +/// Utility function to safely `dup2` over stderr (fd 2). +#[cfg(not(any(windows, target_os = "wasi")))] +#[allow(clippy::mem_forget)] +#[inline] +pub fn dup2_stderr<Fd: AsFd>(fd: Fd) -> io::Result<()> { + // SAFETY: We pass the returned `OwnedFd` to `forget` so that it isn't + // dropped. + let mut target = unsafe { take_stderr() }; + backend::io::syscalls::dup2(fd.as_fd(), &mut target)?; + forget(target); + Ok(()) +} |