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use std::os::unix::io::{FromRawFd as _, IntoRawFd as _};
pub fn create_pt() -> nix::Result<(std::fs::File, std::path::PathBuf)> {
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)?;
let ptsname = nix::pty::ptsname_r(&pt)?.into();
let pt_fd = pt.into_raw_fd();
// Safety: posix_openpt (or the previous functions operating on the
// result) would have returned an Err (causing us to return early) if the
// file descriptor was invalid. additionally, into_raw_fd gives up
// ownership over the file descriptor, allowing the newly created File
// object to take full ownership.
let pt = unsafe { std::fs::File::from_raw_fd(pt_fd) };
Ok((pt, ptsname))
}
pub fn set_term_size(
fh: &impl std::os::unix::io::AsRawFd,
size: crate::Size,
) -> nix::Result<()> {
let size = size.into();
let fd = fh.as_raw_fd();
// Safety: std::fs::File 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.
unsafe {
set_term_size_unsafe(fd, std::ptr::NonNull::from(&size).as_ptr())
}
.map(|_| ())
}
pub fn setup_subprocess(
pts: &impl std::os::unix::io::AsRawFd,
) -> nix::Result<(
std::process::Stdio,
std::process::Stdio,
std::process::Stdio,
)> {
let pts_fd = pts.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(
pts: &impl std::os::unix::io::AsRawFd,
) -> impl FnMut() -> std::io::Result<()> {
let pts_fd = pts.as_raw_fd();
move || {
nix::unistd::setsid()?;
set_controlling_terminal(pts_fd)?;
Ok(())
}
}
fn set_controlling_terminal(fd: std::os::unix::io::RawFd) -> nix::Result<()> {
// Safety: std::fs::File 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
);
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