1 files changed, 249 insertions, 0 deletions
diff --git a/vendor/rustix/src/imp/linux_raw/termios/syscalls.rs b/vendor/rustix/src/imp/linux_raw/termios/syscalls.rs
new file mode 100644
index 000000000..b62a033e0
--- /dev/null
+++ b/vendor/rustix/src/imp/linux_raw/termios/syscalls.rs
@@ -0,0 +1,249 @@
+//! linux_raw syscalls supporting `rustix::termios`.
+//!
+//! # Safety
+//!
+//! See the `rustix::imp` module documentation for details.
+#![allow(unsafe_code)]
+#![allow(clippy::undocumented_unsafe_blocks)]
+
+use super::super::conv::{by_ref, c_uint, ret};
+use crate::fd::BorrowedFd;
+use crate::io;
+use crate::process::{Pid, RawNonZeroPid};
+use crate::termios::{
+    Action, OptionalActions, QueueSelector, Termios, Winsize, BRKINT, CBAUD, CS8, CSIZE, ECHO,
+    ECHONL, ICANON, ICRNL, IEXTEN, IGNBRK, IGNCR, INLCR, ISIG, ISTRIP, IXON, OPOST, PARENB, PARMRK,
+    VMIN, VTIME,
+};
+#[cfg(feature = "procfs")]
+use crate::{ffi::CStr, fs::FileType, path::DecInt};
+use core::mem::MaybeUninit;
+use linux_raw_sys::general::__kernel_pid_t;
+use linux_raw_sys::ioctl::{
+    TCFLSH, TCGETS, TCSBRK, TCSETS, TCXONC, TIOCGPGRP, TIOCGSID, TIOCGWINSZ, TIOCSPGRP, TIOCSWINSZ,
+};
+
+#[inline]
+pub(crate) fn tcgetwinsize(fd: BorrowedFd<'_>) -> io::Result<Winsize> {
+    unsafe {
+        let mut result = MaybeUninit::<Winsize>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGWINSZ), &mut result))
+            .map(|()| result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetattr(fd: BorrowedFd<'_>) -> io::Result<Termios> {
+    unsafe {
+        let mut result = MaybeUninit::<Termios>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TCGETS), &mut result)).map(|()| result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetpgrp(fd: BorrowedFd<'_>) -> io::Result<Pid> {
+    unsafe {
+        let mut result = MaybeUninit::<__kernel_pid_t>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGPGRP), &mut result)).map(|()| {
+            let pid = result.assume_init();
+            debug_assert!(pid > 0);
+            Pid::from_raw_nonzero(RawNonZeroPid::new_unchecked(pid as u32))
+        })
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetattr(
+    fd: BorrowedFd,
+    optional_actions: OptionalActions,
+    termios: &Termios,
+) -> io::Result<()> {
+    // Translate from `optional_actions` into an ioctl request code. On MIPS,
+    // `optional_actions` already has `TCGETS` added to it.
+    let request = if cfg!(any(target_arch = "mips", target_arch = "mips64")) {
+        optional_actions as u32
+    } else {
+        TCSETS + optional_actions as u32
+    };
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(request as u32),
+            by_ref(termios)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsendbreak(fd: BorrowedFd) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_ioctl, fd, c_uint(TCSBRK), c_uint(0))) }
+}
+
+#[inline]
+pub(crate) fn tcdrain(fd: BorrowedFd) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_ioctl, fd, c_uint(TCSBRK), c_uint(1))) }
+}
+
+#[inline]
+pub(crate) fn tcflush(fd: BorrowedFd, queue_selector: QueueSelector) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TCFLSH),
+            c_uint(queue_selector as u32)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcflow(fd: BorrowedFd, action: Action) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TCXONC),
+            c_uint(action as u32)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetsid(fd: BorrowedFd) -> io::Result<Pid> {
+    unsafe {
+        let mut result = MaybeUninit::<__kernel_pid_t>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGSID), &mut result)).map(|()| {
+            let pid = result.assume_init();
+            debug_assert!(pid > 0);
+            Pid::from_raw_nonzero(RawNonZeroPid::new_unchecked(pid as u32))
+        })
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetwinsize(fd: BorrowedFd, winsize: Winsize) -> io::Result<()> {
+    unsafe {
+        ret(syscall!(
+            __NR_ioctl,
+            fd,
+            c_uint(TIOCSWINSZ),
+            by_ref(&winsize)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetpgrp(fd: BorrowedFd<'_>, pid: Pid) -> io::Result<()> {
+    unsafe { ret(syscall!(__NR_ioctl, fd, c_uint(TIOCSPGRP), pid)) }
+}
+
+#[inline]
+#[must_use]
+#[allow(clippy::missing_const_for_fn)]
+pub(crate) fn cfgetospeed(termios: &Termios) -> u32 {
+    termios.c_cflag & CBAUD
+}
+
+#[inline]
+#[must_use]
+#[allow(clippy::missing_const_for_fn)]
+pub(crate) fn cfgetispeed(termios: &Termios) -> u32 {
+    termios.c_cflag & CBAUD
+}
+
+#[inline]
+pub(crate) fn cfmakeraw(termios: &mut Termios) {
+    // From the Linux [`cfmakeraw` man page]:
+    //
+    // [`cfmakeraw` man page]: https://man7.org/linux/man-pages/man3/cfmakeraw.3.html
+    termios.c_iflag &= !(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+    termios.c_oflag &= !OPOST;
+    termios.c_lflag &= !(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+    termios.c_cflag &= !(CSIZE | PARENB);
+    termios.c_cflag |= CS8;
+
+    // Musl and glibc also do these:
+    termios.c_cc[VMIN] = 1;
+    termios.c_cc[VTIME] = 0;
+}
+
+#[inline]
+pub(crate) fn cfsetospeed(termios: &mut Termios, speed: u32) -> io::Result<()> {
+    if (speed & !CBAUD) != 0 {
+        return Err(io::Errno::INVAL);
+    }
+    termios.c_cflag &= !CBAUD;
+    termios.c_cflag |= speed;
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn cfsetispeed(termios: &mut Termios, speed: u32) -> io::Result<()> {
+    if speed == 0 {
+        return Ok(());
+    }
+    if (speed & !CBAUD) != 0 {
+        return Err(io::Errno::INVAL);
+    }
+    termios.c_cflag &= !CBAUD;
+    termios.c_cflag |= speed;
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn cfsetspeed(termios: &mut Termios, speed: u32) -> io::Result<()> {
+    if (speed & !CBAUD) != 0 {
+        return Err(io::Errno::INVAL);
+    }
+    termios.c_cflag &= !CBAUD;
+    termios.c_cflag |= speed;
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn isatty(fd: BorrowedFd<'_>) -> bool {
+    // On error, Linux will return either `EINVAL` (2.6.32) or `ENOTTY`
+    // (otherwise), because we assume we're never passing an invalid
+    // file descriptor (which would get `EBADF`). Either way, an error
+    // means we don't have a tty.
+    tcgetwinsize(fd).is_ok()
+}
+
+#[cfg(feature = "procfs")]
+pub(crate) fn ttyname(fd: BorrowedFd<'_>, buf: &mut [u8]) -> io::Result<usize> {
+    let fd_stat = super::super::fs::syscalls::fstat(fd)?;
+
+    // Quick check: if `fd` isn't a character device, it's not a tty.
+    if FileType::from_raw_mode(fd_stat.st_mode) != FileType::CharacterDevice {
+        return Err(crate::io::Errno::NOTTY);
+    }
+
+    // Check that `fd` is really a tty.
+    tcgetwinsize(fd)?;
+
+    // Get a fd to '/proc/self/fd'.
+    let proc_self_fd = io::proc_self_fd()?;
+
+    // Gather the ttyname by reading the 'fd' file inside 'proc_self_fd'.
+    let r =
+        super::super::fs::syscalls::readlinkat(proc_self_fd, DecInt::from_fd(&fd).as_c_str(), buf)?;
+
+    // If the number of bytes is equal to the buffer length, truncation may
+    // have occurred. This check also ensures that we have enough space for
+    // adding a NUL terminator.
+    if r == buf.len() {
+        return Err(io::Errno::RANGE);
+    }
+    buf[r] = b'\0';
+
+    // Check that the path we read refers to the same file as `fd`.
+    let path = CStr::from_bytes_with_nul(&buf[..=r]).unwrap();
+
+    let path_stat = super::super::fs::syscalls::stat(path)?;
+    if path_stat.st_dev != fd_stat.st_dev || path_stat.st_ino != fd_stat.st_ino {
+        return Err(crate::io::Errno::NODEV);
+    }
+
+    Ok(r)
+}