1 files changed, 312 insertions, 0 deletions
diff --git a/vendor/rustix/src/io/read_write.rs b/vendor/rustix/src/io/read_write.rs
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+++ b/vendor/rustix/src/io/read_write.rs
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+//! `read` and `write`, optionally positioned, optionally vectored
+
+#![allow(unsafe_code)]
+
+use crate::buffer::split_init;
+use crate::{backend, io};
+use backend::fd::AsFd;
+use core::mem::MaybeUninit;
+
+// Declare `IoSlice` and `IoSliceMut`.
+#[cfg(not(windows))]
+pub use crate::maybe_polyfill::io::{IoSlice, IoSliceMut};
+
+#[cfg(linux_kernel)]
+pub use backend::io::types::ReadWriteFlags;
+
+/// `read(fd, buf)`—Reads from a stream.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/read.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/read.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/read.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=read&sektion=2
+/// [NetBSD]: https://man.netbsd.org/read.2
+/// [OpenBSD]: https://man.openbsd.org/read.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=read&section=2
+/// [illumos]: https://illumos.org/man/2/read
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/I_002fO-Primitives.html#index-reading-from-a-file-descriptor
+#[inline]
+pub fn read<Fd: AsFd>(fd: Fd, buf: &mut [u8]) -> io::Result<usize> {
+    unsafe { backend::io::syscalls::read(fd.as_fd(), buf.as_mut_ptr(), buf.len()) }
+}
+
+/// `read(fd, buf)`—Reads from a stream.
+///
+/// This is equivalent to [`read`], except that it can read into uninitialized
+/// memory. It returns the slice that was initialized by this function and the
+/// slice that remains uninitialized.
+#[inline]
+pub fn read_uninit<Fd: AsFd>(
+    fd: Fd,
+    buf: &mut [MaybeUninit<u8>],
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>])> {
+    // Get number of initialized bytes.
+    let length =
+        unsafe { backend::io::syscalls::read(fd.as_fd(), buf.as_mut_ptr() as *mut u8, buf.len()) };
+
+    // Split into the initialized and uninitialized portions.
+    Ok(unsafe { split_init(buf, length?) })
+}
+
+/// `write(fd, buf)`—Writes to a stream.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/write.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/write.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=write&sektion=2
+/// [NetBSD]: https://man.netbsd.org/write.2
+/// [OpenBSD]: https://man.openbsd.org/write.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=write&section=2
+/// [illumos]: https://illumos.org/man/2/write
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/I_002fO-Primitives.html#index-writing-to-a-file-descriptor
+#[inline]
+pub fn write<Fd: AsFd>(fd: Fd, buf: &[u8]) -> io::Result<usize> {
+    backend::io::syscalls::write(fd.as_fd(), buf)
+}
+
+/// `pread(fd, buf, offset)`—Reads from a file at a given position.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pread.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/pread.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/pread.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pread&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pread.2
+/// [OpenBSD]: https://man.openbsd.org/pread.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pread&section=2
+/// [illumos]: https://illumos.org/man/2/pread
+#[inline]
+pub fn pread<Fd: AsFd>(fd: Fd, buf: &mut [u8], offset: u64) -> io::Result<usize> {
+    unsafe { backend::io::syscalls::pread(fd.as_fd(), buf.as_mut_ptr(), buf.len(), offset) }
+}
+
+/// `pread(fd, buf, offset)`—Reads from a file at a given position.
+///
+/// This is equivalent to [`pread`], except that it can read into uninitialized
+/// memory. It returns the slice that was initialized by this function and the
+/// slice that remains uninitialized.
+#[inline]
+pub fn pread_uninit<Fd: AsFd>(
+    fd: Fd,
+    buf: &mut [MaybeUninit<u8>],
+    offset: u64,
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>])> {
+    let length = unsafe {
+        backend::io::syscalls::pread(fd.as_fd(), buf.as_mut_ptr() as *mut u8, buf.len(), offset)
+    };
+    Ok(unsafe { split_init(buf, length?) })
+}
+
+/// `pwrite(fd, bufs)`—Writes to a file at a given position.
+///
+/// Contrary to POSIX, on many popular platforms including Linux and FreeBSD,
+/// if the file is opened in append mode, this ignores the offset appends the
+/// data to the end of the file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pwrite.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/pwrite.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/pwrite.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pwrite&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pwrite.2
+/// [OpenBSD]: https://man.openbsd.org/pwrite.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pwrite&section=2
+/// [illumos]: https://illumos.org/man/2/pwrite
+#[inline]
+pub fn pwrite<Fd: AsFd>(fd: Fd, buf: &[u8], offset: u64) -> io::Result<usize> {
+    backend::io::syscalls::pwrite(fd.as_fd(), buf, offset)
+}
+
+/// `readv(fd, bufs)`—Reads from a stream into multiple buffers.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/readv.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/readv.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/readv.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=readv&sektion=2
+/// [NetBSD]: https://man.netbsd.org/readv.2
+/// [OpenBSD]: https://man.openbsd.org/readv.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=readv&section=2
+/// [illumos]: https://illumos.org/man/2/readv
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+pub fn readv<Fd: AsFd>(fd: Fd, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+    backend::io::syscalls::readv(fd.as_fd(), bufs)
+}
+
+/// `writev(fd, bufs)`—Writes to a stream from multiple buffers.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/writev.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/writev.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/writev.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=writev&sektion=2
+/// [NetBSD]: https://man.netbsd.org/writev.2
+/// [OpenBSD]: https://man.openbsd.org/writev.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=writev&section=2
+/// [illumos]: https://illumos.org/man/2/writev
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+pub fn writev<Fd: AsFd>(fd: Fd, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+    backend::io::syscalls::writev(fd.as_fd(), bufs)
+}
+
+/// `preadv(fd, bufs, offset)`—Reads from a file at a given position into
+/// multiple buffers.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/preadv.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=preadv&sektion=2
+/// [NetBSD]: https://man.netbsd.org/preadv.2
+/// [OpenBSD]: https://man.openbsd.org/preadv.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=preadv&section=2
+/// [illumos]: https://illumos.org/man/2/preadv
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "solaris",
+    target_os = "vita"
+)))]
+#[inline]
+pub fn preadv<Fd: AsFd>(fd: Fd, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize> {
+    backend::io::syscalls::preadv(fd.as_fd(), bufs, offset)
+}
+
+/// `pwritev(fd, bufs, offset)`—Writes to a file at a given position from
+/// multiple buffers.
+///
+/// Contrary to POSIX, on many popular platforms including Linux and FreeBSD,
+/// if the file is opened in append mode, this ignores the offset appends the
+/// data to the end of the file.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/pwritev.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pwritev&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pwritev.2
+/// [OpenBSD]: https://man.openbsd.org/pwritev.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pwritev&section=2
+/// [illumos]: https://illumos.org/man/2/pwritev
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "solaris",
+    target_os = "vita"
+)))]
+#[inline]
+pub fn pwritev<Fd: AsFd>(fd: Fd, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize> {
+    backend::io::syscalls::pwritev(fd.as_fd(), bufs, offset)
+}
+
+/// `preadv2(fd, bufs, offset, flags)`—Reads data, with several options.
+///
+/// An `offset` of `u64::MAX` means to use and update the current file offset.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/preadv2.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn preadv2<Fd: AsFd>(
+    fd: Fd,
+    bufs: &mut [IoSliceMut<'_>],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    backend::io::syscalls::preadv2(fd.as_fd(), bufs, offset, flags)
+}
+
+/// `pwritev2(fd, bufs, offset, flags)`—Writes data, with several options.
+///
+/// An `offset` of `u64::MAX` means to use and update the current file offset.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/pwritev2.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn pwritev2<Fd: AsFd>(
+    fd: Fd,
+    bufs: &[IoSlice<'_>],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    backend::io::syscalls::pwritev2(fd.as_fd(), bufs, offset, flags)
+}