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|
use std::os::fd::{AsRawFd as _, FromRawFd as _};
#[derive(Debug)]
pub struct Pty(pub nix::pty::PtyMaster);
impl Pty {
pub fn open() -> crate::Result<Self> {
let pt = nix::pty::posix_openpt(
nix::fcntl::OFlag::O_RDWR
| nix::fcntl::OFlag::O_NOCTTY
| nix::fcntl::OFlag::O_CLOEXEC,
)?;
nix::pty::grantpt(&pt)?;
nix::pty::unlockpt(&pt)?;
Ok(Self(pt))
}
pub fn set_term_size(&self, size: crate::Size) -> crate::Result<()> {
let size = size.into();
let fd = self.0.as_raw_fd();
// Safety: nix::pty::PtyMaster is required to contain a valid file
// descriptor and size is guaranteed to be initialized because it's a
// normal rust value, and nix::pty::Winsize is a repr(C) struct with
// the same layout as `struct winsize` from sys/ioctl.h.
Ok(unsafe {
set_term_size_unsafe(fd, std::ptr::NonNull::from(&size).as_ptr())
}
.map(|_| ())?)
}
pub fn pts(&self) -> crate::Result<Pts> {
Ok(Pts(std::fs::OpenOptions::new()
.read(true)
.write(true)
.open(nix::pty::ptsname_r(&self.0)?)?
.into()))
}
#[cfg(feature = "async")]
pub fn set_nonblocking(&self) -> nix::Result<()> {
let bits = nix::fcntl::fcntl(
self.0.as_raw_fd(),
nix::fcntl::FcntlArg::F_GETFL,
)?;
// Safety: bits was just returned from a F_GETFL call. ideally i would
// just be able to use from_bits here, but it fails for some reason?
let mut opts =
unsafe { nix::fcntl::OFlag::from_bits_unchecked(bits) };
opts |= nix::fcntl::OFlag::O_NONBLOCK;
nix::fcntl::fcntl(
self.0.as_raw_fd(),
nix::fcntl::FcntlArg::F_SETFL(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()
}
}
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 || {
nix::unistd::setsid()?;
// Safety: OwnedFds are required to contain a valid file descriptor
unsafe {
set_controlling_terminal_unsafe(pts_fd, std::ptr::null())
}?;
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()
}
}
nix::ioctl_write_ptr_bad!(
set_term_size_unsafe,
libc::TIOCSWINSZ,
nix::pty::Winsize
);
nix::ioctl_write_ptr_bad!(
set_controlling_terminal_unsafe,
libc::TIOCSCTTY,
libc::c_int
);
|
