| //! `read` and `write`, optionally positioned, optionally vectored |
| |
| use crate::{backend, io}; |
| use backend::fd::AsFd; |
| |
| // Declare `IoSlice` and `IoSliceMut`. |
| #[cfg(not(windows))] |
| #[cfg(not(feature = "std"))] |
| pub use backend::io::io_slice::{IoSlice, IoSliceMut}; |
| #[cfg(not(windows))] |
| #[cfg(feature = "std")] |
| pub use std::io::{IoSlice, IoSliceMut}; |
| |
| #[cfg(any(target_os = "android", target_os = "linux"))] |
| pub use backend::io::types::ReadWriteFlags; |
| |
| /// `read(fd, buf)`—Reads from a stream. |
| /// |
| /// # References |
| /// - [POSIX] |
| /// - [Linux] |
| /// - [Apple] |
| /// |
| /// [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 |
| #[inline] |
| pub fn read<Fd: AsFd>(fd: Fd, buf: &mut [u8]) -> io::Result<usize> { |
| backend::io::syscalls::read(fd.as_fd(), buf) |
| } |
| |
| /// `write(fd, buf)`—Writes to a stream. |
| /// |
| /// # References |
| /// - [POSIX] |
| /// - [Linux] |
| /// - [Apple] |
| /// |
| /// [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 |
| #[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] |
| /// |
| /// [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 |
| #[inline] |
| pub fn pread<Fd: AsFd>(fd: Fd, buf: &mut [u8], offset: u64) -> io::Result<usize> { |
| backend::io::syscalls::pread(fd.as_fd(), buf, offset) |
| } |
| |
| /// `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] |
| /// |
| /// [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 |
| #[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] |
| /// |
| /// [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 |
| #[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] |
| /// |
| /// [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 |
| #[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] |
| /// |
| /// [Linux]: https://man7.org/linux/man-pages/man2/preadv.2.html |
| #[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "solaris")))] |
| #[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] |
| /// |
| /// [Linux]: https://man7.org/linux/man-pages/man2/pwritev.2.html |
| #[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "solaris")))] |
| #[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(any(target_os = "android", target_os = "linux"))] |
| #[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(any(target_os = "android", target_os = "linux"))] |
| #[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) |
| } |