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|
use std::{
fs::File,
io,
os::{raw::c_int, unix::io::FromRawFd},
};
pub(super) fn pipe() -> io::Result<(File, File)> {
let mut fds = [0; 2];
// The only known way right now to create atomically set the CLOEXEC flag is
// to use the `pipe2` syscall. This was added to Linux in 2.6.27, glibc 2.9
// and musl 0.9.3, and some other targets also have it.
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox"
))]
{
unsafe {
cvt(libc::pipe2(fds.as_mut_ptr(), libc::O_CLOEXEC))?;
}
}
#[cfg(not(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox"
)))]
{
unsafe {
cvt(libc::pipe(fds.as_mut_ptr()))?;
}
cloexec::set_cloexec(fds[0])?;
cloexec::set_cloexec(fds[1])?;
}
unsafe { Ok((File::from_raw_fd(fds[0]), File::from_raw_fd(fds[1]))) }
}
fn cvt(t: c_int) -> io::Result<c_int> {
if t == -1 {
Err(io::Error::last_os_error())
} else {
Ok(t)
}
}
#[cfg(not(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox"
)))]
mod cloexec {
use super::{c_int, cvt, io};
#[cfg(not(any(
target_env = "newlib",
target_os = "solaris",
target_os = "illumos",
target_os = "emscripten",
target_os = "fuchsia",
target_os = "l4re",
target_os = "linux",
target_os = "haiku",
target_os = "redox",
target_os = "vxworks",
target_os = "nto",
)))]
pub(super) fn set_cloexec(fd: c_int) -> io::Result<()> {
unsafe {
cvt(libc::ioctl(fd, libc::FIOCLEX))?;
}
Ok(())
}
#[cfg(any(
all(
target_env = "newlib",
not(any(target_os = "espidf", target_os = "horizon"))
),
target_os = "solaris",
target_os = "illumos",
target_os = "emscripten",
target_os = "fuchsia",
target_os = "l4re",
target_os = "linux",
target_os = "haiku",
target_os = "redox",
target_os = "vxworks",
target_os = "nto",
))]
pub(super) fn set_cloexec(fd: c_int) -> io::Result<()> {
unsafe {
let previous = cvt(libc::fcntl(fd, libc::F_GETFD))?;
let new = previous | libc::FD_CLOEXEC;
if new != previous {
cvt(libc::fcntl(fd, libc::F_SETFD, new))?;
}
}
Ok(())
}
// FD_CLOEXEC is not supported in ESP-IDF and Horizon OS but there's no need to,
// because neither supports spawning processes.
#[cfg(any(target_os = "espidf", target_os = "horizon"))]
pub(super) fn set_cloexec(_fd: c_int) -> io::Result<()> {
Ok(())
}
}
|
