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//! libc syscalls supporting `rustix::termios`.
//!
//! # Safety
//!
//! See the `rustix::imp::syscalls` module documentation for details.
#![allow(unsafe_code)]
use super::super::c;
use super::super::conv::{borrowed_fd, ret, ret_pid_t};
use crate::fd::BorrowedFd;
#[cfg(feature = "procfs")]
#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
use crate::ffi::CStr;
use crate::io;
use crate::process::{Pid, RawNonZeroPid};
use crate::termios::{Action, OptionalActions, QueueSelector, Speed, Termios, Winsize};
use core::mem::MaybeUninit;
use libc_errno::errno;
pub(crate) fn tcgetattr(fd: BorrowedFd<'_>) -> io::Result<Termios> {
let mut result = MaybeUninit::<Termios>::uninit();
unsafe {
ret(c::tcgetattr(borrowed_fd(fd), result.as_mut_ptr())).map(|()| result.assume_init())
}
}
pub(crate) fn tcgetpgrp(fd: BorrowedFd<'_>) -> io::Result<Pid> {
unsafe {
let pid = ret_pid_t(c::tcgetpgrp(borrowed_fd(fd)))?;
debug_assert_ne!(pid, 0);
Ok(Pid::from_raw_nonzero(RawNonZeroPid::new_unchecked(pid)))
}
}
pub(crate) fn tcsetpgrp(fd: BorrowedFd<'_>, pid: Pid) -> io::Result<()> {
unsafe { ret(c::tcsetpgrp(borrowed_fd(fd), pid.as_raw_nonzero().get())) }
}
pub(crate) fn tcsetattr(
fd: BorrowedFd,
optional_actions: OptionalActions,
termios: &Termios,
) -> io::Result<()> {
unsafe {
ret(c::tcsetattr(
borrowed_fd(fd),
optional_actions as _,
termios,
))
}
}
pub(crate) fn tcsendbreak(fd: BorrowedFd) -> io::Result<()> {
unsafe { ret(c::tcsendbreak(borrowed_fd(fd), 0)) }
}
pub(crate) fn tcdrain(fd: BorrowedFd) -> io::Result<()> {
unsafe { ret(c::tcdrain(borrowed_fd(fd))) }
}
pub(crate) fn tcflush(fd: BorrowedFd, queue_selector: QueueSelector) -> io::Result<()> {
unsafe { ret(c::tcflush(borrowed_fd(fd), queue_selector as _)) }
}
pub(crate) fn tcflow(fd: BorrowedFd, action: Action) -> io::Result<()> {
unsafe { ret(c::tcflow(borrowed_fd(fd), action as _)) }
}
pub(crate) fn tcgetsid(fd: BorrowedFd) -> io::Result<Pid> {
unsafe {
let pid = ret_pid_t(c::tcgetsid(borrowed_fd(fd)))?;
debug_assert_ne!(pid, 0);
Ok(Pid::from_raw_nonzero(RawNonZeroPid::new_unchecked(pid)))
}
}
pub(crate) fn tcsetwinsize(fd: BorrowedFd, winsize: Winsize) -> io::Result<()> {
unsafe { ret(c::ioctl(borrowed_fd(fd), c::TIOCSWINSZ, &winsize)) }
}
pub(crate) fn tcgetwinsize(fd: BorrowedFd) -> io::Result<Winsize> {
unsafe {
let mut buf = MaybeUninit::<Winsize>::uninit();
ret(c::ioctl(
borrowed_fd(fd),
c::TIOCGWINSZ.into(),
buf.as_mut_ptr(),
))?;
Ok(buf.assume_init())
}
}
#[inline]
#[must_use]
pub(crate) fn cfgetospeed(termios: &Termios) -> Speed {
unsafe { c::cfgetospeed(termios) }
}
#[inline]
#[must_use]
pub(crate) fn cfgetispeed(termios: &Termios) -> Speed {
unsafe { c::cfgetispeed(termios) }
}
#[inline]
pub(crate) fn cfmakeraw(termios: &mut Termios) {
unsafe { c::cfmakeraw(termios) }
}
#[inline]
pub(crate) fn cfsetospeed(termios: &mut Termios, speed: Speed) -> io::Result<()> {
unsafe { ret(c::cfsetospeed(termios, speed)) }
}
#[inline]
pub(crate) fn cfsetispeed(termios: &mut Termios, speed: Speed) -> io::Result<()> {
unsafe { ret(c::cfsetispeed(termios, speed)) }
}
#[inline]
pub(crate) fn cfsetspeed(termios: &mut Termios, speed: Speed) -> io::Result<()> {
unsafe { ret(c::cfsetspeed(termios, speed)) }
}
pub(crate) fn isatty(fd: BorrowedFd<'_>) -> bool {
let res = unsafe { c::isatty(borrowed_fd(fd)) };
if res == 0 {
match errno().0 {
#[cfg(not(any(target_os = "android", target_os = "linux")))]
c::ENOTTY => false,
// Old Linux versions reportedly return `EINVAL`.
// <https://man7.org/linux/man-pages/man3/isatty.3.html#ERRORS>
#[cfg(any(target_os = "android", target_os = "linux"))]
c::ENOTTY | c::EINVAL => false,
// Darwin mysteriously returns `EOPNOTSUPP` sometimes.
#[cfg(any(target_os = "ios", target_os = "macos"))]
c::EOPNOTSUPP => false,
err => panic!("unexpected error from isatty: {:?}", err),
}
} else {
true
}
}
#[cfg(feature = "procfs")]
#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
pub(crate) fn ttyname(dirfd: BorrowedFd<'_>, buf: &mut [u8]) -> io::Result<usize> {
unsafe {
// `ttyname_r` returns its error status rather than using `errno`.
match c::ttyname_r(borrowed_fd(dirfd), buf.as_mut_ptr().cast(), buf.len()) {
0 => Ok(CStr::from_ptr(buf.as_ptr().cast()).to_bytes().len()),
err => Err(io::Errno::from_raw_os_error(err)),
}
}
}
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