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use std::os::{
fd::{AsRawFd as _, FromRawFd as _},
unix::prelude::OsStrExt as _,
};
#[derive(Debug)]
pub struct Pty(std::os::fd::OwnedFd);
impl Pty {
pub fn open() -> crate::Result<Self> {
let pt = rustix::pty::openpt(
// can't use CLOEXEC here because it's linux-specific
rustix::pty::OpenptFlags::RDWR | rustix::pty::OpenptFlags::NOCTTY,
)?;
rustix::pty::grantpt(&pt)?;
rustix::pty::unlockpt(&pt)?;
let mut flags = rustix::io::fcntl_getfd(&pt)?;
flags |= rustix::io::FdFlags::CLOEXEC;
rustix::io::fcntl_setfd(&pt, flags)?;
Ok(Self(pt))
}
pub fn set_term_size(&self, size: crate::Size) -> crate::Result<()> {
let size = libc::winsize::from(size);
let fd = self.0.as_raw_fd();
// TODO: upstream this to rustix
let ret = unsafe {
libc::ioctl(fd, libc::TIOCSWINSZ, std::ptr::addr_of!(size))
};
if ret == -1 {
Err(rustix::io::Errno::from_raw_os_error(
std::io::Error::last_os_error().raw_os_error().unwrap_or(0),
)
.into())
} else {
Ok(())
}
}
pub fn pts(&self) -> crate::Result<Pts> {
Ok(Pts(std::fs::OpenOptions::new()
.read(true)
.write(true)
.open(std::ffi::OsStr::from_bytes(
rustix::pty::ptsname(&self.0, vec![])?.as_bytes(),
))?
.into()))
}
#[cfg(feature = "async")]
pub fn set_nonblocking(&self) -> rustix::io::Result<()> {
let mut opts = rustix::fs::fcntl_getfl(&self.0)?;
opts |= rustix::fs::OFlags::NONBLOCK;
rustix::fs::fcntl_setfl(&self.0, opts)?;
Ok(())
}
}
impl From<Pty> for std::os::fd::OwnedFd {
fn from(pty: Pty) -> Self {
let Pty(nix_ptymaster) = pty;
let raw_fd = nix_ptymaster.as_raw_fd();
std::mem::forget(nix_ptymaster);
// Safety: nix::pty::PtyMaster is required to contain a valid file
// descriptor, and we ensured that the file descriptor will remain
// valid by skipping the drop implementation for nix::pty::PtyMaster
unsafe { Self::from_raw_fd(raw_fd) }
}
}
impl std::os::fd::AsFd for Pty {
fn as_fd(&self) -> std::os::fd::BorrowedFd<'_> {
let raw_fd = self.0.as_raw_fd();
// Safety: nix::pty::PtyMaster is required to contain a valid file
// descriptor, and it is owned by self
unsafe { std::os::fd::BorrowedFd::borrow_raw(raw_fd) }
}
}
impl std::os::fd::AsRawFd for Pty {
fn as_raw_fd(&self) -> std::os::fd::RawFd {
self.0.as_raw_fd()
}
}
impl std::io::Read for Pty {
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
rustix::io::read(&self.0, buf).map_err(std::io::Error::from)
}
}
impl std::io::Write for Pty {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
rustix::io::write(&self.0, buf).map_err(std::io::Error::from)
}
fn flush(&mut self) -> std::io::Result<()> {
Ok(())
}
}
impl std::io::Read for &Pty {
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
rustix::io::read(&self.0, buf).map_err(std::io::Error::from)
}
}
impl std::io::Write for &Pty {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
rustix::io::write(&self.0, buf).map_err(std::io::Error::from)
}
fn flush(&mut self) -> std::io::Result<()> {
Ok(())
}
}
pub struct Pts(std::os::fd::OwnedFd);
impl Pts {
pub fn setup_subprocess(
&self,
) -> std::io::Result<(
std::process::Stdio,
std::process::Stdio,
std::process::Stdio,
)> {
Ok((
self.0.try_clone()?.into(),
self.0.try_clone()?.into(),
self.0.try_clone()?.into(),
))
}
pub fn session_leader(&self) -> impl FnMut() -> std::io::Result<()> {
let pts_fd = self.0.as_raw_fd();
move || {
rustix::process::setsid()?;
rustix::process::ioctl_tiocsctty(unsafe {
std::os::fd::BorrowedFd::borrow_raw(pts_fd)
})?;
Ok(())
}
}
}
impl From<Pts> for std::os::fd::OwnedFd {
fn from(pts: Pts) -> Self {
pts.0
}
}
impl std::os::fd::AsFd for Pts {
fn as_fd(&self) -> std::os::fd::BorrowedFd<'_> {
self.0.as_fd()
}
}
impl std::os::fd::AsRawFd for Pts {
fn as_raw_fd(&self) -> std::os::fd::RawFd {
self.0.as_raw_fd()
}
}
|
