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|
use std::os::unix::io::{AsRawFd as _, FromRawFd as _, IntoRawFd 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_raw_fd()))
}
#[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 std::os::unix::io::AsRawFd for Pty {
fn as_raw_fd(&self) -> std::os::unix::io::RawFd {
self.0.as_raw_fd()
}
}
pub struct Pts(std::os::unix::io::RawFd);
impl Pts {
pub fn setup_subprocess(
&self,
) -> nix::Result<(
std::process::Stdio,
std::process::Stdio,
std::process::Stdio,
)> {
let pts_fd = self.0.as_raw_fd();
let stdin = nix::fcntl::fcntl(
pts_fd,
nix::fcntl::FcntlArg::F_DUPFD_CLOEXEC(0),
)?;
let stdout = nix::fcntl::fcntl(
pts_fd,
nix::fcntl::FcntlArg::F_DUPFD_CLOEXEC(0),
)?;
let stderr = nix::fcntl::fcntl(
pts_fd,
nix::fcntl::FcntlArg::F_DUPFD_CLOEXEC(0),
)?;
// Safety: these file descriptors were all just returned from dup, so
// they must be valid
Ok((
unsafe { std::process::Stdio::from_raw_fd(stdin) },
unsafe { std::process::Stdio::from_raw_fd(stdout) },
unsafe { std::process::Stdio::from_raw_fd(stderr) },
))
}
pub fn session_leader(&self) -> impl FnMut() -> std::io::Result<()> {
let pts_fd = self.0.as_raw_fd();
move || {
nix::unistd::setsid()?;
set_controlling_terminal(pts_fd)?;
Ok(())
}
}
}
impl Drop for Pts {
fn drop(&mut self) {
let _ = nix::unistd::close(self.0);
}
}
impl std::os::unix::io::AsRawFd for Pts {
fn as_raw_fd(&self) -> std::os::unix::io::RawFd {
self.0
}
}
fn set_controlling_terminal(fd: std::os::unix::io::RawFd) -> nix::Result<()> {
// Safety: Pts is required to contain a valid file descriptor
unsafe { set_controlling_terminal_unsafe(fd, std::ptr::null()) }
.map(|_| ())
}
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
);
|
