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Add AsFd implementations for stdio types on WASI.

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This mirrors the implementations on Unix platforms, and also mirrors the
existing `AsRawFd` impls.
This commit is contained in:
Dan Gohman 2022-08-22 12:14:35 -07:00
parent e0dc8d7801
commit 2efe6b0d3d
1 changed files with 22 additions and 1 deletions
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23
library/std/src/sys/wasi/stdio.rs
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@ -4,7 +4,7 @@
use crate::io::{self, IoSlice, IoSliceMut};
use crate::mem::ManuallyDrop;
use crate::os::raw;
use crate::os::wasi::io::{AsRawFd, FromRawFd};
use crate::os::wasi::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd};
pub struct Stdin;
pub struct Stdout;
@ -23,6 +23,13 @@ fn as_raw_fd(&self) -> raw::c_int {
}
}
impl AsFd for Stdin {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
unsafe { BorrowedFd::borrow_raw(0) }
}
}
impl io::Read for Stdin {
fn read(&mut self, data: &mut [u8]) -> io::Result<usize> {
self.read_vectored(&mut [IoSliceMut::new(data)])
@ -51,6 +58,13 @@ fn as_raw_fd(&self) -> raw::c_int {
}
}
impl AsFd for Stdout {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
unsafe { BorrowedFd::borrow_raw(1) }
}
}
impl io::Write for Stdout {
fn write(&mut self, data: &[u8]) -> io::Result<usize> {
self.write_vectored(&[IoSlice::new(data)])
@ -82,6 +96,13 @@ fn as_raw_fd(&self) -> raw::c_int {
}
}
impl AsFd for Stderr {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
unsafe { BorrowedFd::borrow_raw(2) }
}
}
impl io::Write for Stderr {
fn write(&mut self, data: &[u8]) -> io::Result<usize> {
self.write_vectored(&[IoSlice::new(data)])