stdio_utils/sys/
unix.rs

1use std::io::{Error, Result};
2pub(crate) use std::os::fd::{AsFd, BorrowedFd, OwnedFd};
3use std::os::fd::{AsRawFd, RawFd};
4
5use crate::{AsFdExt as _, Guard, Stdio};
6
7pub(crate) const DEV_NULL: &str = "/dev/null";
8
9impl Stdio {
10    fn as_raw_fd(&self) -> RawFd {
11        match self {
12            Stdio::Stdin => libc::STDIN_FILENO,
13            Stdio::Stdout => libc::STDOUT_FILENO,
14            Stdio::Stderr => libc::STDERR_FILENO,
15        }
16    }
17
18    unsafe fn set_raw_fd(&self, fd: RawFd) -> Result<()> {
19        if libc::dup2(fd, self.as_raw_fd()) < 0 {
20            return Err(Error::last_os_error());
21        }
22        Ok(())
23    }
24}
25
26impl AsFd for Stdio {
27    fn as_fd(&self) -> BorrowedFd<'static> {
28        unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) }
29    }
30}
31
32impl AsFd for Guard {
33    fn as_fd(&self) -> BorrowedFd<'_> {
34        self.backup.as_ref().unwrap().borrow_file()
35    }
36}
37
38pub(crate) fn borrow_fd(file: &(impl AsFd + ?Sized)) -> BorrowedFd<'_> {
39    file.as_fd()
40}
41
42pub(crate) unsafe fn override_stdio(file: impl AsFd, stdio: Stdio) -> Result<OwnedFd> {
43    let backup = stdio.duplicate_file()?;
44    stdio.set_raw_fd(file.as_fd().as_raw_fd())?;
45    Ok(backup)
46}
stdio_utils/sys/unix.rs

stdio_utils/sys/
unix.rs
