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Move std::sys::wasi::ext to std::os::wasi

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This commit is contained in:
Christiaan Dirkx 2021-03-04 15:39:31 +01:00
parent a808fd44a3
commit 3edba7a806
8 changed files with 2 additions and 26 deletions
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3
library/std/src/os/mod.rs
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@ -19,8 +19,7 @@ cfg_if::cfg_if! {
pub mod linux;
#[stable(feature = "wasi_ext_doc", since = "1.35.0")]
pub use crate::sys::wasi_ext as wasi;
pub mod wasi;
pub mod windows;
} else if #[cfg(doc)] {

6
library/std/src/os/wasi.rs
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@ -1,6 +0,0 @@
//! WASI-specific definitions
#![stable(feature = "raw_ext", since = "1.1.0")]
#[stable(feature = "rust1", since = "1.0.0")]
pub use crate::sys::ext::*;

6
library/std/src/os/wasi/ffi.rs Normal file
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@ -0,0 +1,6 @@
//! WASI-specific extension to the primitives in the `std::ffi` module
#![stable(feature = "rust1", since = "1.0.0")]
#[stable(feature = "rust1", since = "1.0.0")]
pub use crate::sys_common::os_str_bytes::*;

536
library/std/src/os/wasi/fs.rs Normal file
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@ -0,0 +1,536 @@
//! WASI-specific extensions to primitives in the `std::fs` module.
#![deny(unsafe_op_in_unsafe_fn)]
#![unstable(feature = "wasi_ext", issue = "none")]
use crate::ffi::OsStr;
use crate::fs::{self, File, Metadata, OpenOptions};
use crate::io::{self, IoSlice, IoSliceMut};
use crate::path::{Path, PathBuf};
use crate::sys_common::{AsInner, AsInnerMut, FromInner};
// Used for `File::read` on intra-doc links
#[allow(unused_imports)]
use io::{Read, Write};
/// WASI-specific extensions to [`File`].
pub trait FileExt {
/// Reads a number of bytes starting from a given offset.
///
/// Returns the number of bytes read.
///
/// The offset is relative to the start of the file and thus independent
/// from the current cursor.
///
/// The current file cursor is not affected by this function.
///
/// Note that similar to [`File::read`], it is not an error to return with a
/// short read.
fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
let bufs = &mut [IoSliceMut::new(buf)];
self.read_vectored_at(bufs, offset)
}
/// Reads a number of bytes starting from a given offset.
///
/// Returns the number of bytes read.
///
/// The offset is relative to the start of the file and thus independent
/// from the current cursor.
///
/// The current file cursor is not affected by this function.
///
/// Note that similar to [`File::read_vectored`], it is not an error to
/// return with a short read.
fn read_vectored_at(&self, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize>;
/// Reads the exact number of byte required to fill `buf` from the given offset.
///
/// The offset is relative to the start of the file and thus independent
/// from the current cursor.
///
/// The current file cursor is not affected by this function.
///
/// Similar to [`Read::read_exact`] but uses [`read_at`] instead of `read`.
///
/// [`read_at`]: FileExt::read_at
///
/// # Errors
///
/// If this function encounters an error of the kind
/// [`io::ErrorKind::Interrupted`] then the error is ignored and the operation
/// will continue.
///
/// If this function encounters an "end of file" before completely filling
/// the buffer, it returns an error of the kind [`io::ErrorKind::UnexpectedEof`].
/// The contents of `buf` are unspecified in this case.
///
/// If any other read error is encountered then this function immediately
/// returns. The contents of `buf` are unspecified in this case.
///
/// If this function returns an error, it is unspecified how many bytes it
/// has read, but it will never read more than would be necessary to
/// completely fill the buffer.
#[stable(feature = "rw_exact_all_at", since = "1.33.0")]
fn read_exact_at(&self, mut buf: &mut [u8], mut offset: u64) -> io::Result<()> {
while !buf.is_empty() {
match self.read_at(buf, offset) {
Ok(0) => break,
Ok(n) => {
let tmp = buf;
buf = &mut tmp[n..];
offset += n as u64;
}
Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {}
Err(e) => return Err(e),
}
}
if !buf.is_empty() {
Err(io::Error::new_const(io::ErrorKind::UnexpectedEof, &"failed to fill whole buffer"))
} else {
Ok(())
}
}
/// Writes a number of bytes starting from a given offset.
///
/// Returns the number of bytes written.
///
/// The offset is relative to the start of the file and thus independent
/// from the current cursor.
///
/// The current file cursor is not affected by this function.
///
/// When writing beyond the end of the file, the file is appropriately
/// extended and the intermediate bytes are initialized with the value 0.
///
/// Note that similar to [`File::write`], it is not an error to return a
/// short write.
fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
let bufs = &[IoSlice::new(buf)];
self.write_vectored_at(bufs, offset)
}
/// Writes a number of bytes starting from a given offset.
///
/// Returns the number of bytes written.
///
/// The offset is relative to the start of the file and thus independent
/// from the current cursor.
///
/// The current file cursor is not affected by this function.
///
/// When writing beyond the end of the file, the file is appropriately
/// extended and the intermediate bytes are initialized with the value 0.
///
/// Note that similar to [`File::write_vectored`], it is not an error to return a
/// short write.
fn write_vectored_at(&self, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize>;
/// Attempts to write an entire buffer starting from a given offset.
///
/// The offset is relative to the start of the file and thus independent
/// from the current cursor.
///
/// The current file cursor is not affected by this function.
///
/// This method will continuously call [`write_at`] until there is no more data
/// to be written or an error of non-[`io::ErrorKind::Interrupted`] kind is
/// returned. This method will not return until the entire buffer has been
/// successfully written or such an error occurs. The first error that is
/// not of [`io::ErrorKind::Interrupted`] kind generated from this method will be
/// returned.
///
/// # Errors
///
/// This function will return the first error of
/// non-[`io::ErrorKind::Interrupted`] kind that [`write_at`] returns.
///
/// [`write_at`]: FileExt::write_at
#[stable(feature = "rw_exact_all_at", since = "1.33.0")]
fn write_all_at(&self, mut buf: &[u8], mut offset: u64) -> io::Result<()> {
while !buf.is_empty() {
match self.write_at(buf, offset) {
Ok(0) => {
return Err(io::Error::new_const(
io::ErrorKind::WriteZero,
&"failed to write whole buffer",
));
}
Ok(n) => {
buf = &buf[n..];
offset += n as u64
}
Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {}
Err(e) => return Err(e),
}
}
Ok(())
}
/// Returns the current position within the file.
///
/// This corresponds to the `fd_tell` syscall and is similar to
/// `seek` where you offset 0 bytes from the current position.
fn tell(&self) -> io::Result<u64>;
/// Adjust the flags associated with this file.
///
/// This corresponds to the `fd_fdstat_set_flags` syscall.
fn fdstat_set_flags(&self, flags: u16) -> io::Result<()>;
/// Adjust the rights associated with this file.
///
/// This corresponds to the `fd_fdstat_set_rights` syscall.
fn fdstat_set_rights(&self, rights: u64, inheriting: u64) -> io::Result<()>;
/// Provide file advisory information on a file descriptor.
///
/// This corresponds to the `fd_advise` syscall.
fn advise(&self, offset: u64, len: u64, advice: u8) -> io::Result<()>;
/// Force the allocation of space in a file.
///
/// This corresponds to the `fd_allocate` syscall.
fn allocate(&self, offset: u64, len: u64) -> io::Result<()>;
/// Create a directory.
///
/// This corresponds to the `path_create_directory` syscall.
fn create_directory<P: AsRef<Path>>(&self, dir: P) -> io::Result<()>;
/// Read the contents of a symbolic link.
///
/// This corresponds to the `path_readlink` syscall.
fn read_link<P: AsRef<Path>>(&self, path: P) -> io::Result<PathBuf>;
/// Return the attributes of a file or directory.
///
/// This corresponds to the `path_filestat_get` syscall.
fn metadata_at<P: AsRef<Path>>(&self, lookup_flags: u32, path: P) -> io::Result<Metadata>;
/// Unlink a file.
///
/// This corresponds to the `path_unlink_file` syscall.
fn remove_file<P: AsRef<Path>>(&self, path: P) -> io::Result<()>;
/// Remove a directory.
///
/// This corresponds to the `path_remove_directory` syscall.
fn remove_directory<P: AsRef<Path>>(&self, path: P) -> io::Result<()>;
}
// FIXME: bind fd_fdstat_get - need to define a custom return type
// FIXME: bind fd_readdir - can't return `ReadDir` since we only have entry name
// FIXME: bind fd_filestat_set_times maybe? - on crates.io for unix
// FIXME: bind path_filestat_set_times maybe? - on crates.io for unix
// FIXME: bind poll_oneoff maybe? - probably should wait for I/O to settle
// FIXME: bind random_get maybe? - on crates.io for unix
impl FileExt for fs::File {
fn read_vectored_at(&self, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize> {
self.as_inner().fd().pread(bufs, offset)
}
fn write_vectored_at(&self, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize> {
self.as_inner().fd().pwrite(bufs, offset)
}
fn tell(&self) -> io::Result<u64> {
self.as_inner().fd().tell()
}
fn fdstat_set_flags(&self, flags: u16) -> io::Result<()> {
self.as_inner().fd().set_flags(flags)
}
fn fdstat_set_rights(&self, rights: u64, inheriting: u64) -> io::Result<()> {
self.as_inner().fd().set_rights(rights, inheriting)
}
fn advise(&self, offset: u64, len: u64, advice: u8) -> io::Result<()> {
self.as_inner().fd().advise(offset, len, advice)
}
fn allocate(&self, offset: u64, len: u64) -> io::Result<()> {
self.as_inner().fd().allocate(offset, len)
}
fn create_directory<P: AsRef<Path>>(&self, dir: P) -> io::Result<()> {
self.as_inner().fd().create_directory(osstr2str(dir.as_ref().as_ref())?)
}
fn read_link<P: AsRef<Path>>(&self, path: P) -> io::Result<PathBuf> {
self.as_inner().read_link(path.as_ref())
}
fn metadata_at<P: AsRef<Path>>(&self, lookup_flags: u32, path: P) -> io::Result<Metadata> {
let m = self.as_inner().metadata_at(lookup_flags, path.as_ref())?;
Ok(FromInner::from_inner(m))
}
fn remove_file<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
self.as_inner().fd().unlink_file(osstr2str(path.as_ref().as_ref())?)
}
fn remove_directory<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
self.as_inner().fd().remove_directory(osstr2str(path.as_ref().as_ref())?)
}
}
/// WASI-specific extensions to [`fs::OpenOptions`].
pub trait OpenOptionsExt {
/// Pass custom `dirflags` argument to `path_open`.
///
/// This option configures the `dirflags` argument to the
/// `path_open` syscall which `OpenOptions` will eventually call. The
/// `dirflags` argument configures how the file is looked up, currently
/// primarily affecting whether symlinks are followed or not.
///
/// By default this value is `__WASI_LOOKUP_SYMLINK_FOLLOW`, or symlinks are
/// followed. You can call this method with 0 to disable following symlinks
fn lookup_flags(&mut self, flags: u32) -> &mut Self;
/// Indicates whether `OpenOptions` must open a directory or not.
///
/// This method will configure whether the `__WASI_O_DIRECTORY` flag is
/// passed when opening a file. When passed it will require that the opened
/// path is a directory.
///
/// This option is by default `false`
fn directory(&mut self, dir: bool) -> &mut Self;
/// Indicates whether `__WASI_FDFLAG_DSYNC` is passed in the `fs_flags`
/// field of `path_open`.
///
/// This option is by default `false`
fn dsync(&mut self, dsync: bool) -> &mut Self;
/// Indicates whether `__WASI_FDFLAG_NONBLOCK` is passed in the `fs_flags`
/// field of `path_open`.
///
/// This option is by default `false`
fn nonblock(&mut self, nonblock: bool) -> &mut Self;
/// Indicates whether `__WASI_FDFLAG_RSYNC` is passed in the `fs_flags`
/// field of `path_open`.
///
/// This option is by default `false`
fn rsync(&mut self, rsync: bool) -> &mut Self;
/// Indicates whether `__WASI_FDFLAG_SYNC` is passed in the `fs_flags`
/// field of `path_open`.
///
/// This option is by default `false`
fn sync(&mut self, sync: bool) -> &mut Self;
/// Indicates the value that should be passed in for the `fs_rights_base`
/// parameter of `path_open`.
///
/// This option defaults based on the `read` and `write` configuration of
/// this `OpenOptions` builder. If this method is called, however, the
/// exact mask passed in will be used instead.
fn fs_rights_base(&mut self, rights: u64) -> &mut Self;
/// Indicates the value that should be passed in for the
/// `fs_rights_inheriting` parameter of `path_open`.
///
/// The default for this option is the same value as what will be passed
/// for the `fs_rights_base` parameter but if this method is called then
/// the specified value will be used instead.
fn fs_rights_inheriting(&mut self, rights: u64) -> &mut Self;
/// Open a file or directory.
///
/// This corresponds to the `path_open` syscall.
fn open_at<P: AsRef<Path>>(&self, file: &File, path: P) -> io::Result<File>;
}
impl OpenOptionsExt for OpenOptions {
fn lookup_flags(&mut self, flags: u32) -> &mut OpenOptions {
self.as_inner_mut().lookup_flags(flags);
self
}
fn directory(&mut self, dir: bool) -> &mut OpenOptions {
self.as_inner_mut().directory(dir);
self
}
fn dsync(&mut self, enabled: bool) -> &mut OpenOptions {
self.as_inner_mut().dsync(enabled);
self
}
fn nonblock(&mut self, enabled: bool) -> &mut OpenOptions {
self.as_inner_mut().nonblock(enabled);
self
}
fn rsync(&mut self, enabled: bool) -> &mut OpenOptions {
self.as_inner_mut().rsync(enabled);
self
}
fn sync(&mut self, enabled: bool) -> &mut OpenOptions {
self.as_inner_mut().sync(enabled);
self
}
fn fs_rights_base(&mut self, rights: u64) -> &mut OpenOptions {
self.as_inner_mut().fs_rights_base(rights);
self
}
fn fs_rights_inheriting(&mut self, rights: u64) -> &mut OpenOptions {
self.as_inner_mut().fs_rights_inheriting(rights);
self
}
fn open_at<P: AsRef<Path>>(&self, file: &File, path: P) -> io::Result<File> {
let inner = file.as_inner().open_at(path.as_ref(), self.as_inner())?;
Ok(File::from_inner(inner))
}
}
/// WASI-specific extensions to [`fs::Metadata`].
pub trait MetadataExt {
/// Returns the `st_dev` field of the internal `filestat_t`
fn dev(&self) -> u64;
/// Returns the `st_ino` field of the internal `filestat_t`
fn ino(&self) -> u64;
/// Returns the `st_nlink` field of the internal `filestat_t`
fn nlink(&self) -> u64;
/// Returns the `st_size` field of the internal `filestat_t`
fn size(&self) -> u64;
/// Returns the `st_atim` field of the internal `filestat_t`
fn atim(&self) -> u64;
/// Returns the `st_mtim` field of the internal `filestat_t`
fn mtim(&self) -> u64;
/// Returns the `st_ctim` field of the internal `filestat_t`
fn ctim(&self) -> u64;
}
impl MetadataExt for fs::Metadata {
fn dev(&self) -> u64 {
self.as_inner().as_wasi().dev
}
fn ino(&self) -> u64 {
self.as_inner().as_wasi().ino
}
fn nlink(&self) -> u64 {
self.as_inner().as_wasi().nlink
}
fn size(&self) -> u64 {
self.as_inner().as_wasi().size
}
fn atim(&self) -> u64 {
self.as_inner().as_wasi().atim
}
fn mtim(&self) -> u64 {
self.as_inner().as_wasi().mtim
}
fn ctim(&self) -> u64 {
self.as_inner().as_wasi().ctim
}
}
/// WASI-specific extensions for [`fs::FileType`].
///
/// Adds support for special WASI file types such as block/character devices,
/// pipes, and sockets.
pub trait FileTypeExt {
/// Returns `true` if this file type is a block device.
fn is_block_device(&self) -> bool;
/// Returns `true` if this file type is a character device.
fn is_character_device(&self) -> bool;
/// Returns `true` if this file type is a socket datagram.
fn is_socket_dgram(&self) -> bool;
/// Returns `true` if this file type is a socket stream.
fn is_socket_stream(&self) -> bool;
}
impl FileTypeExt for fs::FileType {
fn is_block_device(&self) -> bool {
self.as_inner().bits() == wasi::FILETYPE_BLOCK_DEVICE
}
fn is_character_device(&self) -> bool {
self.as_inner().bits() == wasi::FILETYPE_CHARACTER_DEVICE
}
fn is_socket_dgram(&self) -> bool {
self.as_inner().bits() == wasi::FILETYPE_SOCKET_DGRAM
}
fn is_socket_stream(&self) -> bool {
self.as_inner().bits() == wasi::FILETYPE_SOCKET_STREAM
}
}
/// WASI-specific extension methods for [`fs::DirEntry`].
pub trait DirEntryExt {
/// Returns the underlying `d_ino` field of the `dirent_t`
fn ino(&self) -> u64;
}
impl DirEntryExt for fs::DirEntry {
fn ino(&self) -> u64 {
self.as_inner().ino()
}
}
/// Create a hard link.
///
/// This corresponds to the `path_link` syscall.
pub fn link<P: AsRef<Path>, U: AsRef<Path>>(
old_fd: &File,
old_flags: u32,
old_path: P,
new_fd: &File,
new_path: U,
) -> io::Result<()> {
old_fd.as_inner().fd().link(
old_flags,
osstr2str(old_path.as_ref().as_ref())?,
new_fd.as_inner().fd(),
osstr2str(new_path.as_ref().as_ref())?,
)
}
/// Rename a file or directory.
///
/// This corresponds to the `path_rename` syscall.
pub fn rename<P: AsRef<Path>, U: AsRef<Path>>(
old_fd: &File,
old_path: P,
new_fd: &File,
new_path: U,
) -> io::Result<()> {
old_fd.as_inner().fd().rename(
osstr2str(old_path.as_ref().as_ref())?,
new_fd.as_inner().fd(),
osstr2str(new_path.as_ref().as_ref())?,
)
}
/// Create a symbolic link.
///
/// This corresponds to the `path_symlink` syscall.
pub fn symlink<P: AsRef<Path>, U: AsRef<Path>>(
old_path: P,
fd: &File,
new_path: U,
) -> io::Result<()> {
fd.as_inner()
.fd()
.symlink(osstr2str(old_path.as_ref().as_ref())?, osstr2str(new_path.as_ref().as_ref())?)
}
/// Create a symbolic link.
///
/// This is a convenience API similar to `std::os::unix::fs::symlink` and
/// `std::os::windows::fs::symlink_file` and `std::os::windows::fs::symlink_dir`.
pub fn symlink_path<P: AsRef<Path>, U: AsRef<Path>>(old_path: P, new_path: U) -> io::Result<()> {
crate::sys::fs::symlink(old_path.as_ref(), new_path.as_ref())
}
fn osstr2str(f: &OsStr) -> io::Result<&str> {
f.to_str().ok_or_else(|| io::Error::new_const(io::ErrorKind::Other, &"input must be utf-8"))
}

201
library/std/src/os/wasi/io.rs Normal file
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@ -0,0 +1,201 @@
//! WASI-specific extensions to general I/O primitives
#![deny(unsafe_op_in_unsafe_fn)]
#![unstable(feature = "wasi_ext", issue = "none")]
use crate::fs;
use crate::io;
use crate::net;
use crate::sys;
use crate::sys_common::{AsInner, FromInner, IntoInner};
/// Raw file descriptors.
pub type RawFd = u32;
/// A trait to extract the raw WASI file descriptor from an underlying
/// object.
pub trait AsRawFd {
/// Extracts the raw file descriptor.
///
/// This method does **not** pass ownership of the raw file descriptor
/// to the caller. The descriptor is only guaranteed to be valid while
/// the original object has not yet been destroyed.
fn as_raw_fd(&self) -> RawFd;
}
/// A trait to express the ability to construct an object from a raw file
/// descriptor.
pub trait FromRawFd {
/// Constructs a new instance of `Self` from the given raw file
/// descriptor.
///
/// This function **consumes ownership** of the specified file
/// descriptor. The returned object will take responsibility for closing
/// it when the object goes out of scope.
///
/// This function is also unsafe as the primitives currently returned
/// have the contract that they are the sole owner of the file
/// descriptor they are wrapping. Usage of this function could
/// accidentally allow violating this contract which can cause memory
/// unsafety in code that relies on it being true.
unsafe fn from_raw_fd(fd: RawFd) -> Self;
}
/// A trait to express the ability to consume an object and acquire ownership of
/// its raw file descriptor.
pub trait IntoRawFd {
/// Consumes this object, returning the raw underlying file descriptor.
///
/// This function **transfers ownership** of the underlying file descriptor
/// to the caller. Callers are then the unique owners of the file descriptor
/// and must close the descriptor once it's no longer needed.
fn into_raw_fd(self) -> RawFd;
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl AsRawFd for RawFd {
#[inline]
fn as_raw_fd(&self) -> RawFd {
*self
}
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl IntoRawFd for RawFd {
#[inline]
fn into_raw_fd(self) -> RawFd {
self
}
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl FromRawFd for RawFd {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> RawFd {
fd
}
}
impl AsRawFd for net::TcpStream {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.as_inner().fd().as_raw()
}
}
impl FromRawFd for net::TcpStream {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> net::TcpStream {
net::TcpStream::from_inner(sys::net::TcpStream::from_inner(fd))
}
}
impl IntoRawFd for net::TcpStream {
#[inline]
fn into_raw_fd(self) -> RawFd {
self.into_inner().into_fd().into_raw()
}
}
impl AsRawFd for net::TcpListener {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.as_inner().fd().as_raw()
}
}
impl FromRawFd for net::TcpListener {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> net::TcpListener {
net::TcpListener::from_inner(sys::net::TcpListener::from_inner(fd))
}
}
impl IntoRawFd for net::TcpListener {
#[inline]
fn into_raw_fd(self) -> RawFd {
self.into_inner().into_fd().into_raw()
}
}
impl AsRawFd for net::UdpSocket {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.as_inner().fd().as_raw()
}
}
impl FromRawFd for net::UdpSocket {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> net::UdpSocket {
net::UdpSocket::from_inner(sys::net::UdpSocket::from_inner(fd))
}
}
impl IntoRawFd for net::UdpSocket {
#[inline]
fn into_raw_fd(self) -> RawFd {
self.into_inner().into_fd().into_raw()
}
}
impl AsRawFd for fs::File {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.as_inner().fd().as_raw()
}
}
impl FromRawFd for fs::File {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> fs::File {
fs::File::from_inner(sys::fs::File::from_inner(fd))
}
}
impl IntoRawFd for fs::File {
#[inline]
fn into_raw_fd(self) -> RawFd {
self.into_inner().into_fd().into_raw()
}
}
impl AsRawFd for io::Stdin {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDIN_FILENO as RawFd
}
}
impl AsRawFd for io::Stdout {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDOUT_FILENO as RawFd
}
}
impl AsRawFd for io::Stderr {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDERR_FILENO as RawFd
}
}
impl<'a> AsRawFd for io::StdinLock<'a> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDIN_FILENO as RawFd
}
}
impl<'a> AsRawFd for io::StdoutLock<'a> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDOUT_FILENO as RawFd
}
}
impl<'a> AsRawFd for io::StderrLock<'a> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDERR_FILENO as RawFd
}
}

53
library/std/src/os/wasi/mod.rs Normal file
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@ -0,0 +1,53 @@
//! Platform-specific extensions to `std` for WASI.
//!
//! Provides access to platform-level information on WASI, and exposes
//! WASI-specific functions that would otherwise be inappropriate as
//! part of the core `std` library.
//!
//! It exposes more ways to deal with platform-specific strings (`OsStr`,
//! `OsString`), allows to set permissions more granularly, extract low-level
//! file descriptors from files and sockets, and has platform-specific helpers
//! for spawning processes.
//!
//! # Examples
//!
//! ```no_run
//! use std::fs::File;
//! use std::os::wasi::prelude::*;
//!
//! fn main() -> std::io::Result<()> {
//! let f = File::create("foo.txt")?;
//! let fd = f.as_raw_fd();
//!
//! // use fd with native WASI bindings
//!
//! Ok(())
//! }
//! ```
#![stable(feature = "rust1", since = "1.0.0")]
#![deny(unsafe_op_in_unsafe_fn)]
#![doc(cfg(target_os = "wasi"))]
pub mod ffi;
pub mod fs;
pub mod io;
/// A prelude for conveniently writing platform-specific code.
///
/// Includes all extension traits, and some important type definitions.
#[stable(feature = "rust1", since = "1.0.0")]
pub mod prelude {
#[doc(no_inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use super::ffi::{OsStrExt, OsStringExt};
#[doc(no_inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use super::fs::FileTypeExt;
#[doc(no_inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use super::fs::{DirEntryExt, FileExt, MetadataExt, OpenOptionsExt};
#[doc(no_inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use super::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
}