From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001 From: Valentin Popov Date: Mon, 8 Jan 2024 01:21:28 +0400 Subject: Initial vendor packages Signed-off-by: Valentin Popov --- vendor/rustix/src/backend/libc/termios/syscalls.rs | 403 +++++++++++++++++++++ 1 file changed, 403 insertions(+) create mode 100644 vendor/rustix/src/backend/libc/termios/syscalls.rs (limited to 'vendor/rustix/src/backend/libc/termios/syscalls.rs') diff --git a/vendor/rustix/src/backend/libc/termios/syscalls.rs b/vendor/rustix/src/backend/libc/termios/syscalls.rs new file mode 100644 index 0000000..a833aea --- /dev/null +++ b/vendor/rustix/src/backend/libc/termios/syscalls.rs @@ -0,0 +1,403 @@ +//! libc syscalls supporting `rustix::termios`. +//! +//! # Safety +//! +//! See the `rustix::backend::syscalls` module documentation for details. + +use crate::backend::c; +#[cfg(not(target_os = "wasi"))] +use crate::backend::conv::ret_pid_t; +use crate::backend::conv::{borrowed_fd, ret}; +use crate::fd::BorrowedFd; +#[cfg(all(feature = "alloc", feature = "procfs"))] +#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))] +use crate::ffi::CStr; +#[cfg(any( + not(target_os = "espidf"), + all( + feature = "procfs", + not(any(target_os = "fuchsia", target_os = "wasi")) + ) +))] +use core::mem::MaybeUninit; +#[cfg(not(target_os = "wasi"))] +use {crate::io, crate::pid::Pid}; +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +use { + crate::termios::{Action, OptionalActions, QueueSelector, Termios, Winsize}, + crate::utils::as_mut_ptr, +}; + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +pub(crate) fn tcgetattr(fd: BorrowedFd<'_>) -> io::Result { + // If we have `TCGETS2`, use it, so that we fill in the `c_ispeed` and + // `c_ospeed` fields. + #[cfg(linux_kernel)] + { + use crate::termios::{ControlModes, InputModes, LocalModes, OutputModes, SpecialCodes}; + use crate::utils::default_array; + + let termios2 = unsafe { + let mut termios2 = MaybeUninit::::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"))] + { + termios2.write(core::mem::zeroed()); + } + + ret(c::ioctl( + borrowed_fd(fd), + c::TCGETS2 as _, + termios2.as_mut_ptr(), + ))?; + + termios2.assume_init() + }; + + // Convert from the Linux `termios2` to our `Termios`. + let mut result = Termios { + input_modes: InputModes::from_bits_retain(termios2.c_iflag), + output_modes: OutputModes::from_bits_retain(termios2.c_oflag), + control_modes: ControlModes::from_bits_retain(termios2.c_cflag), + local_modes: LocalModes::from_bits_retain(termios2.c_lflag), + line_discipline: termios2.c_line, + special_codes: SpecialCodes(default_array()), + input_speed: termios2.c_ispeed, + output_speed: termios2.c_ospeed, + }; + + // 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"))] + { + use crate::termios::speed; + + if result.output_speed == 0 && (termios2.c_cflag & c::CBAUD) != c::BOTHER { + if let Some(output_speed) = speed::decode(termios2.c_cflag & c::CBAUD) { + result.output_speed = output_speed; + } + } + if result.input_speed == 0 + && ((termios2.c_cflag & 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 ((termios2.c_cflag & c::CIBAUD) >> c::IBSHIFT) == c::B0 { + result.input_speed = result.output_speed; + } else if let Some(input_speed) = + speed::decode((termios2.c_cflag & c::CIBAUD) >> c::IBSHIFT) + { + result.input_speed = input_speed; + } + } + } + + result.special_codes.0[..termios2.c_cc.len()].copy_from_slice(&termios2.c_cc); + + Ok(result) + } + + #[cfg(not(linux_kernel))] + unsafe { + let mut result = MaybeUninit::::uninit(); + + // `result` is a `Termios` which starts with the same layout as + // `libc::termios`, so we can cast the pointer. + ret(c::tcgetattr(borrowed_fd(fd), result.as_mut_ptr().cast()))?; + + Ok(result.assume_init()) + } +} + +#[cfg(not(target_os = "wasi"))] +pub(crate) fn tcgetpgrp(fd: BorrowedFd<'_>) -> io::Result { + unsafe { + let pid = ret_pid_t(c::tcgetpgrp(borrowed_fd(fd)))?; + + // This doesn't appear to be documented, but on Linux, it appears + // `tcsetpgrp` can succceed and set the pid to 0 if we pass it a + // pseudo-terminal device fd. For now, translate it into `OPNOTSUPP`. + #[cfg(linux_kernel)] + if pid == 0 { + return Err(io::Errno::OPNOTSUPP); + } + + Ok(Pid::from_raw_unchecked(pid)) + } +} + +#[cfg(not(target_os = "wasi"))] +pub(crate) fn tcsetpgrp(fd: BorrowedFd<'_>, pid: Pid) -> io::Result<()> { + unsafe { ret(c::tcsetpgrp(borrowed_fd(fd), pid.as_raw_nonzero().get())) } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +pub(crate) fn tcsetattr( + fd: BorrowedFd<'_>, + optional_actions: OptionalActions, + termios: &Termios, +) -> io::Result<()> { + // If we have `TCSETS2`, use it, so that we use the `c_ispeed` and + // `c_ospeed` fields. + #[cfg(linux_kernel)] + { + use crate::termios::speed; + use crate::utils::default_array; + use linux_raw_sys::general::{termios2, BOTHER, CBAUD, IBSHIFT}; + + #[cfg(not(any(target_arch = "sparc", target_arch = "sparc64")))] + use linux_raw_sys::ioctl::{TCSETS, TCSETS2}; + + // linux-raw-sys' ioctl-generation script for sparc isn't working yet, + // so as a temporary workaround, declare these manually. + #[cfg(any(target_arch = "sparc", target_arch = "sparc64"))] + const TCSETS: u32 = 0x8024_5409; + #[cfg(any(target_arch = "sparc", target_arch = "sparc64"))] + const TCSETS2: u32 = 0x802c_540d; + + // Translate from `optional_actions` into an ioctl request code. On + // MIPS, `optional_actions` already has `TCGETS` added to it. + let request = TCSETS2 + + if cfg!(any( + target_arch = "mips", + target_arch = "mips32r6", + target_arch = "mips64", + target_arch = "mips64r6" + )) { + optional_actions as u32 - TCSETS + } else { + optional_actions as u32 + }; + + let input_speed = termios.input_speed(); + let output_speed = termios.output_speed(); + let mut termios2 = termios2 { + c_iflag: termios.input_modes.bits(), + c_oflag: termios.output_modes.bits(), + c_cflag: termios.control_modes.bits(), + c_lflag: termios.local_modes.bits(), + c_line: termios.line_discipline, + c_cc: default_array(), + c_ispeed: input_speed, + c_ospeed: output_speed, + }; + // Ensure that our input and output speeds are set, as `libc` + // routines don't always support setting these separately. + termios2.c_cflag &= !CBAUD; + termios2.c_cflag |= speed::encode(output_speed).unwrap_or(BOTHER); + termios2.c_cflag &= !(CBAUD << IBSHIFT); + termios2.c_cflag |= speed::encode(input_speed).unwrap_or(BOTHER) << IBSHIFT; + let nccs = termios2.c_cc.len(); + termios2 + .c_cc + .copy_from_slice(&termios.special_codes.0[..nccs]); + + unsafe { ret(c::ioctl(borrowed_fd(fd), request as _, &termios2)) } + } + + #[cfg(not(linux_kernel))] + unsafe { + ret(c::tcsetattr( + borrowed_fd(fd), + optional_actions as _, + crate::utils::as_ptr(termios).cast(), + )) + } +} + +#[cfg(not(target_os = "wasi"))] +pub(crate) fn tcsendbreak(fd: BorrowedFd<'_>) -> io::Result<()> { + unsafe { ret(c::tcsendbreak(borrowed_fd(fd), 0)) } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +pub(crate) fn tcdrain(fd: BorrowedFd<'_>) -> io::Result<()> { + unsafe { ret(c::tcdrain(borrowed_fd(fd))) } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +pub(crate) fn tcflush(fd: BorrowedFd<'_>, queue_selector: QueueSelector) -> io::Result<()> { + unsafe { ret(c::tcflush(borrowed_fd(fd), queue_selector as _)) } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +pub(crate) fn tcflow(fd: BorrowedFd<'_>, action: Action) -> io::Result<()> { + unsafe { ret(c::tcflow(borrowed_fd(fd), action as _)) } +} + +#[cfg(not(target_os = "wasi"))] +pub(crate) fn tcgetsid(fd: BorrowedFd<'_>) -> io::Result { + unsafe { + let pid = ret_pid_t(c::tcgetsid(borrowed_fd(fd)))?; + Ok(Pid::from_raw_unchecked(pid)) + } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +pub(crate) fn tcsetwinsize(fd: BorrowedFd<'_>, winsize: Winsize) -> io::Result<()> { + unsafe { ret(c::ioctl(borrowed_fd(fd), c::TIOCSWINSZ, &winsize)) } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +pub(crate) fn tcgetwinsize(fd: BorrowedFd<'_>) -> io::Result { + unsafe { + let mut buf = MaybeUninit::::uninit(); + ret(c::ioctl( + borrowed_fd(fd), + c::TIOCGWINSZ.into(), + buf.as_mut_ptr(), + ))?; + Ok(buf.assume_init()) + } +} + +#[cfg(not(any(target_os = "espidf", target_os = "nto", target_os = "wasi")))] +#[inline] +pub(crate) fn set_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> { + #[cfg(bsd)] + let encoded_speed = arbitrary_speed; + + #[cfg(not(bsd))] + let encoded_speed = match crate::termios::speed::encode(arbitrary_speed) { + Some(encoded_speed) => encoded_speed, + #[cfg(linux_kernel)] + None => c::BOTHER, + #[cfg(not(linux_kernel))] + None => return Err(io::Errno::INVAL), + }; + + #[cfg(not(linux_kernel))] + unsafe { + ret(c::cfsetspeed( + as_mut_ptr(termios).cast(), + encoded_speed.into(), + )) + } + + // Linux libc implementations don't support arbitrary speeds, so we encode + // the speed manually. + #[cfg(linux_kernel)] + { + use crate::termios::ControlModes; + + 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 << c::IBSHIFT)); + + termios.input_speed = arbitrary_speed; + termios.output_speed = arbitrary_speed; + + Ok(()) + } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +#[inline] +pub(crate) fn set_output_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> { + #[cfg(bsd)] + let encoded_speed = arbitrary_speed; + + #[cfg(not(bsd))] + let encoded_speed = match crate::termios::speed::encode(arbitrary_speed) { + Some(encoded_speed) => encoded_speed, + #[cfg(linux_kernel)] + None => c::BOTHER, + #[cfg(not(linux_kernel))] + None => return Err(io::Errno::INVAL), + }; + + #[cfg(not(linux_kernel))] + unsafe { + ret(c::cfsetospeed( + as_mut_ptr(termios).cast(), + encoded_speed.into(), + )) + } + + // Linux libc implementations don't support arbitrary speeds or setting the + // input and output speeds separately, so we encode the speed manually. + #[cfg(linux_kernel)] + { + use crate::termios::ControlModes; + + 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(()) + } +} + +#[cfg(not(any(target_os = "espidf", target_os = "wasi")))] +#[inline] +pub(crate) fn set_input_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> { + #[cfg(bsd)] + let encoded_speed = arbitrary_speed; + + #[cfg(not(bsd))] + let encoded_speed = match crate::termios::speed::encode(arbitrary_speed) { + Some(encoded_speed) => encoded_speed, + #[cfg(linux_kernel)] + None => c::BOTHER, + #[cfg(not(linux_kernel))] + None => return Err(io::Errno::INVAL), + }; + + #[cfg(not(linux_kernel))] + unsafe { + ret(c::cfsetispeed( + as_mut_ptr(termios).cast(), + encoded_speed.into(), + )) + } + + // Linux libc implementations don't support arbitrary speeds or setting the + // input and output speeds separately, so we encode the speed manually. + #[cfg(linux_kernel)] + { + use crate::termios::ControlModes; + + 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 << c::IBSHIFT); + + termios.input_speed = arbitrary_speed; + + Ok(()) + } +} + +#[cfg(not(any(target_os = "espidf", target_os = "nto", target_os = "wasi")))] +#[inline] +pub(crate) fn cfmakeraw(termios: &mut Termios) { + unsafe { c::cfmakeraw(as_mut_ptr(termios).cast()) } +} + +pub(crate) fn isatty(fd: BorrowedFd<'_>) -> bool { + // Use the return value of `isatty` alone. We don't check `errno` because + // we return `bool` rather than `io::Result`, because we assume + // `BorrowedFd` protects us from `EBADF`, and any other reasonably + // anticipated `errno` value would end up interpreted as “assume it's not a + // terminal” anyway. + unsafe { c::isatty(borrowed_fd(fd)) != 0 } +} + +#[cfg(all(feature = "alloc", feature = "procfs"))] +#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))] +pub(crate) fn ttyname(dirfd: BorrowedFd<'_>, buf: &mut [MaybeUninit]) -> io::Result { + 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)), + } + } +} -- cgit v1.2.3