2 files changed, 331 insertions, 0 deletions
diff --git a/vendor/rustix/src/backend/linux_raw/termios/mod.rs b/vendor/rustix/src/backend/linux_raw/termios/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/termios/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/termios/syscalls.rs b/vendor/rustix/src/backend/linux_raw/termios/syscalls.rs
new file mode 100644
index 0000000..5a24c0a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/termios/syscalls.rs
@@ -0,0 +1,330 @@
+//! linux_raw syscalls supporting `rustix::termios`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+use crate::backend::conv::{by_ref, c_uint, ret};
+use crate::fd::BorrowedFd;
+use crate::io;
+use crate::pid::Pid;
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+use crate::procfs;
+use crate::termios::{
+    Action, ControlModes, InputModes, LocalModes, OptionalActions, OutputModes, QueueSelector,
+    SpecialCodeIndex, Termios, Winsize,
+};
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+use crate::{ffi::CStr, fs::FileType, path::DecInt};
+use core::mem::MaybeUninit;
+use linux_raw_sys::general::IBSHIFT;
+use linux_raw_sys::ioctl::{
+    TCFLSH, TCSBRK, 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))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetattr(fd: BorrowedFd<'_>) -> io::Result<Termios> {
+    unsafe {
+        let mut result = MaybeUninit::<Termios>::uninit();
+
+        // QEMU's `TCGETS2` doesn't currently set `input_speed` or
+        // `output_speed` on PowerPC, so zero out the fields ourselves.
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+        {
+            result.write(core::mem::zeroed());
+        }
+
+        ret(syscall!(__NR_ioctl, fd, c_uint(c::TCGETS2), &mut result))?;
+
+        let result = result.assume_init();
+
+        // QEMU's `TCGETS2` doesn't currently set `input_speed` or
+        // `output_speed` on PowerPC, so set them manually if we can.
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+        let result = {
+            use crate::termios::speed;
+            let mut result = result;
+            if result.output_speed == 0 && (result.control_modes.bits() & c::CBAUD) != c::BOTHER {
+                if let Some(output_speed) = speed::decode(result.control_modes.bits() & c::CBAUD) {
+                    result.output_speed = output_speed;
+                }
+            }
+            if result.input_speed == 0
+                && ((result.control_modes.bits() & c::CIBAUD) >> c::IBSHIFT) != c::BOTHER
+            {
+                // For input speeds, `B0` is special-cased to mean the input
+                // speed is the same as the output speed.
+                if ((result.control_modes.bits() & c::CIBAUD) >> c::IBSHIFT) == c::B0 {
+                    result.input_speed = result.output_speed;
+                } else if let Some(input_speed) =
+                    speed::decode((result.control_modes.bits() & c::CIBAUD) >> c::IBSHIFT)
+                {
+                    result.input_speed = input_speed;
+                }
+            }
+            result
+        };
+
+        Ok(result)
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetpgrp(fd: BorrowedFd<'_>) -> io::Result<Pid> {
+    unsafe {
+        let mut result = MaybeUninit::<c::pid_t>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGPGRP), &mut result))?;
+        let pid = result.assume_init();
+
+        // This doesn't appear to be documented, but it appears `tcsetpgrp` can
+        // succceed and set the pid to 0 if we pass it a pseudo-terminal device
+        // fd. For now, fail with `OPNOTSUPP`.
+        if pid == 0 {
+            return Err(io::Errno::OPNOTSUPP);
+        }
+
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[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 = linux_raw_sys::ioctl::TCSETS2
+        + if cfg!(any(
+            target_arch = "mips",
+            target_arch = "mips32r6",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )) {
+            optional_actions as u32 - linux_raw_sys::ioctl::TCSETS
+        } else {
+            optional_actions as u32
+        };
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(request),
+            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::<c::pid_t>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGSID), &mut result))?;
+        let pid = result.assume_init();
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetwinsize(fd: BorrowedFd<'_>, winsize: Winsize) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TIOCSWINSZ),
+            by_ref(&winsize)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetpgrp(fd: BorrowedFd<'_>, pid: Pid) -> io::Result<()> {
+    let raw_pid: c::c_int = pid.as_raw_nonzero().get();
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TIOCSPGRP),
+            by_ref(&raw_pid)
+        ))
+    }
+}
+
+/// A wrapper around a conceptual `cfsetspeed` which handles an arbitrary
+/// integer speed value.
+#[inline]
+pub(crate) fn set_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    let encoded_speed = crate::termios::speed::encode(arbitrary_speed).unwrap_or(c::BOTHER);
+
+    debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+    termios.control_modes -= ControlModes::from_bits_retain(c::CBAUD | c::CIBAUD);
+    termios.control_modes |=
+        ControlModes::from_bits_retain(encoded_speed | (encoded_speed << IBSHIFT));
+
+    termios.input_speed = arbitrary_speed;
+    termios.output_speed = arbitrary_speed;
+
+    Ok(())
+}
+
+/// A wrapper around a conceptual `cfsetospeed` which handles an arbitrary
+/// integer speed value.
+#[inline]
+pub(crate) fn set_output_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    let encoded_speed = crate::termios::speed::encode(arbitrary_speed).unwrap_or(c::BOTHER);
+
+    debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+    termios.control_modes -= ControlModes::from_bits_retain(c::CBAUD);
+    termios.control_modes |= ControlModes::from_bits_retain(encoded_speed);
+
+    termios.output_speed = arbitrary_speed;
+
+    Ok(())
+}
+
+/// A wrapper around a conceptual `cfsetispeed` which handles an arbitrary
+/// integer speed value.
+#[inline]
+pub(crate) fn set_input_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    let encoded_speed = crate::termios::speed::encode(arbitrary_speed).unwrap_or(c::BOTHER);
+
+    debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+    termios.control_modes -= ControlModes::from_bits_retain(c::CIBAUD);
+    termios.control_modes |= ControlModes::from_bits_retain(encoded_speed << IBSHIFT);
+
+    termios.input_speed = arbitrary_speed;
+
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn cfmakeraw(termios: &mut Termios) {
+    // From the Linux [`cfmakeraw` manual page]:
+    //
+    // [`cfmakeraw` manual page]: https://man7.org/linux/man-pages/man3/cfmakeraw.3.html
+    termios.input_modes -= InputModes::IGNBRK
+        | InputModes::BRKINT
+        | InputModes::PARMRK
+        | InputModes::ISTRIP
+        | InputModes::INLCR
+        | InputModes::IGNCR
+        | InputModes::ICRNL
+        | InputModes::IXON;
+    termios.output_modes -= OutputModes::OPOST;
+    termios.local_modes -= LocalModes::ECHO
+        | LocalModes::ECHONL
+        | LocalModes::ICANON
+        | LocalModes::ISIG
+        | LocalModes::IEXTEN;
+    termios.control_modes -= ControlModes::CSIZE | ControlModes::PARENB;
+    termios.control_modes |= ControlModes::CS8;
+
+    // Musl and glibc also do these:
+    termios.special_codes[SpecialCodeIndex::VMIN] = 1;
+    termios.special_codes[SpecialCodeIndex::VTIME] = 0;
+}
+
+#[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(all(feature = "alloc", feature = "procfs"))]
+pub(crate) fn ttyname(fd: BorrowedFd<'_>, buf: &mut [MaybeUninit<u8>]) -> io::Result<usize> {
+    let fd_stat = crate::backend::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(io::Errno::NOTTY);
+    }
+
+    // Check that `fd` is really a tty.
+    tcgetwinsize(fd)?;
+
+    // Get a fd to "/proc/self/fd".
+    let proc_self_fd = procfs::proc_self_fd()?;
+
+    // Gather the ttyname by reading the "fd" file inside `proc_self_fd`.
+    let r = crate::backend::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);
+    }
+
+    // `readlinkat` returns the number of bytes placed in the buffer.
+    // NUL-terminate the string at that offset.
+    buf[r].write(b'\0');
+
+    // Check that the path we read refers to the same file as `fd`.
+    {
+        // SAFETY: We just wrote the NUL byte above
+        let path = unsafe { CStr::from_ptr(buf.as_ptr().cast()) };
+
+        let path_stat = crate::backend::fs::syscalls::stat(path)?;
+        if path_stat.st_dev != fd_stat.st_dev || path_stat.st_ino != fd_stat.st_ino {
+            return Err(io::Errno::NODEV);
+        }
+    }
+
+    Ok(r)
+}