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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/rustix/src/pipe.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
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-//! `pipe` and related APIs.
-//!
-//! # Safety
-//!
-//! `vmsplice` is an unsafe function.
-
-#![allow(unsafe_code)]
-
-use crate::fd::OwnedFd;
-use crate::{backend, io};
-#[cfg(not(any(
- solarish,
- windows,
- target_os = "espidf",
- target_os = "haiku",
- target_os = "redox",
- target_os = "vita",
- target_os = "wasi",
-)))]
-use backend::c;
-#[cfg(linux_kernel)]
-use backend::fd::AsFd;
-
-#[cfg(not(apple))]
-pub use backend::pipe::types::PipeFlags;
-
-#[cfg(linux_kernel)]
-pub use backend::pipe::types::{IoSliceRaw, SpliceFlags};
-
-/// `PIPE_BUF`—The maximum length at which writes to a pipe are atomic.
-///
-/// # References
-/// - [Linux]
-/// - [POSIX]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man7/pipe.7.html
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html
-#[cfg(not(any(
- solarish,
- windows,
- target_os = "espidf",
- target_os = "haiku",
- target_os = "hurd",
- target_os = "redox",
- target_os = "vita",
- target_os = "wasi",
-)))]
-pub const PIPE_BUF: usize = c::PIPE_BUF;
-
-/// `pipe()`—Creates a pipe.
-///
-/// This function creates a pipe and returns two file descriptors, for the
-/// reading and writing ends of the pipe, respectively.
-///
-/// # References
-/// - [POSIX]
-/// - [Linux]
-/// - [Apple]
-/// - [FreeBSD]
-/// - [NetBSD]
-/// - [OpenBSD]
-/// - [DragonFly BSD]
-/// - [illumos]
-/// - [glibc]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pipe.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/pipe.2.html
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/pipe.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pipe&sektion=2
-/// [NetBSD]: https://man.netbsd.org/pipe.2
-/// [OpenBSD]: https://man.openbsd.org/pipe.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pipe&section=2
-/// [illumos]: https://illumos.org/man/2/pipe
-/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Creating-a-Pipe.html
-#[inline]
-pub fn pipe() -> io::Result<(OwnedFd, OwnedFd)> {
- backend::pipe::syscalls::pipe()
-}
-
-/// `pipe2(flags)`—Creates a pipe, with flags.
-///
-/// This function creates a pipe and returns two file descriptors, for the
-/// reading and writing ends of the pipe, respectively.
-///
-/// # References
-/// - [Linux]
-/// - [FreeBSD]
-/// - [NetBSD]
-/// - [OpenBSD]
-/// - [DragonFly BSD]
-/// - [illumos]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/pipe2.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pipe2&sektion=2
-/// [NetBSD]: https://man.netbsd.org/pipe2.2
-/// [OpenBSD]: https://man.openbsd.org/pipe2.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pipe2&section=2
-/// [illumos]: https://illumos.org/man/2/pipe2
-#[cfg(not(any(
- apple,
- target_os = "aix",
- target_os = "espidf",
- target_os = "haiku",
- target_os = "nto"
-)))]
-#[inline]
-#[doc(alias = "pipe2")]
-pub fn pipe_with(flags: PipeFlags) -> io::Result<(OwnedFd, OwnedFd)> {
- backend::pipe::syscalls::pipe_with(flags)
-}
-
-/// `splice(fd_in, off_in, fd_out, off_out, len, flags)`—Transfer data
-/// between a file and a pipe.
-///
-/// This function transfers up to `len` bytes of data from the file descriptor
-/// `fd_in` to the file descriptor `fd_out`, where one of the file descriptors
-/// must refer to a pipe.
-///
-/// `off_*` must be `None` if the corresponding fd refers to a pipe. Otherwise
-/// its value points to the starting offset to the file, from which the data is
-/// read/written. On success, the number of bytes read/written is added to the
-/// offset.
-///
-/// Passing `None` causes the read/write to start from the file offset, and the
-/// file offset is adjusted appropriately.
-///
-/// # References
-/// - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/splice.2.html
-#[cfg(linux_kernel)]
-#[inline]
-pub fn splice<FdIn: AsFd, FdOut: AsFd>(
- fd_in: FdIn,
- off_in: Option<&mut u64>,
- fd_out: FdOut,
- off_out: Option<&mut u64>,
- len: usize,
- flags: SpliceFlags,
-) -> io::Result<usize> {
- backend::pipe::syscalls::splice(fd_in.as_fd(), off_in, fd_out.as_fd(), off_out, len, flags)
-}
-
-/// `vmsplice(fd, bufs, flags)`—Transfer data between memory and a pipe.
-///
-/// If `fd` is the write end of the pipe, the function maps the memory pointer
-/// at by `bufs` to the pipe.
-///
-/// If `fd` is the read end of the pipe, the function writes data from the pipe
-/// to said memory.
-///
-/// # Safety
-///
-/// If the memory must not be mutated (such as when `bufs` were originally
-/// immutable slices), it is up to the caller to ensure that the write end of
-/// the pipe is placed in `fd`.
-///
-/// Additionally if `SpliceFlags::GIFT` is set, the caller must also ensure
-/// that the contents of `bufs` in never modified following the call, and that
-/// all of the pointers in `bufs` are page aligned, and the lengths are
-/// multiples of a page size in bytes.
-///
-/// # References
-/// - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/vmsplice.2.html
-#[cfg(linux_kernel)]
-#[inline]
-pub unsafe fn vmsplice<PipeFd: AsFd>(
- fd: PipeFd,
- bufs: &[IoSliceRaw<'_>],
- flags: SpliceFlags,
-) -> io::Result<usize> {
- backend::pipe::syscalls::vmsplice(fd.as_fd(), bufs, flags)
-}
-
-/// `tee(fd_in, fd_out, len, flags)`—Copy data between pipes without
-/// consuming it.
-///
-/// This reads up to `len` bytes from `in_fd` without consuming them, and
-/// writes them to `out_fd`.
-///
-/// # References
-/// - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/tee.2.html
-#[cfg(linux_kernel)]
-#[inline]
-pub fn tee<FdIn: AsFd, FdOut: AsFd>(
- fd_in: FdIn,
- fd_out: FdOut,
- len: usize,
- flags: SpliceFlags,
-) -> io::Result<usize> {
- backend::pipe::syscalls::tee(fd_in.as_fd(), fd_out.as_fd(), len, flags)
-}
-
-/// `fnctl(fd, F_GETPIPE_SZ)`—Return the buffer capacity of a pipe.
-///
-/// # References
-/// - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
-#[cfg(linux_kernel)]
-#[inline]
-pub fn fcntl_getpipe_size<Fd: AsFd>(fd: Fd) -> io::Result<usize> {
- backend::pipe::syscalls::fcntl_getpipe_sz(fd.as_fd())
-}
-
-/// `fnctl(fd, F_SETPIPE_SZ)`—Set the buffer capacity of a pipe.
-///
-/// # References
-/// - [Linux]
-///
-/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
-#[cfg(linux_kernel)]
-#[inline]
-pub fn fcntl_setpipe_size<Fd: AsFd>(fd: Fd, size: usize) -> io::Result<()> {
- backend::pipe::syscalls::fcntl_setpipe_sz(fd.as_fd(), size)
-}