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//! linux_raw syscalls supporting `rustix::pty`.
//!
//! # Safety
//!
//! See the `rustix::backend` module documentation for details.
#![allow(unsafe_code)]
#![allow(clippy::undocumented_unsafe_blocks)]
use crate::backend::c;
use crate::backend::conv::{by_ref, c_uint, ret, ret_owned_fd};
use crate::fd::{BorrowedFd, OwnedFd};
use crate::ffi::CString;
use crate::io;
use crate::path::DecInt;
use crate::pty::OpenptFlags;
use alloc::vec::Vec;
use core::mem::MaybeUninit;
use linux_raw_sys::ioctl::{TIOCGPTN, TIOCGPTPEER, TIOCSPTLCK};
#[inline]
pub(crate) fn ptsname(fd: BorrowedFd, mut buffer: Vec<u8>) -> io::Result<CString> {
unsafe {
let mut n = MaybeUninit::<c::c_int>::uninit();
ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGPTN), &mut n))?;
buffer.clear();
buffer.extend_from_slice(b"/dev/pts/");
buffer.extend_from_slice(DecInt::new(n.assume_init()).as_bytes());
buffer.push(b'\0');
Ok(CString::from_vec_with_nul_unchecked(buffer))
}
}
#[inline]
pub(crate) fn unlockpt(fd: BorrowedFd) -> io::Result<()> {
unsafe {
ret(syscall_readonly!(
__NR_ioctl,
fd,
c_uint(TIOCSPTLCK),
by_ref(&0)
))
}
}
#[cfg(target_os = "linux")]
#[inline]
pub(crate) fn ioctl_tiocgptpeer(fd: BorrowedFd, flags: OpenptFlags) -> io::Result<OwnedFd> {
unsafe {
ret_owned_fd(syscall_readonly!(
__NR_ioctl,
fd,
c_uint(TIOCGPTPEER),
flags
))
}
}
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