mozilla-central/third_party/rust/nix/src/sys/termios.rs

Source code

Revision control

Copy as Markdown

Other Tools

//! An interface for controlling asynchronous communication ports
//!
//! This interface provides a safe wrapper around the termios subsystem defined by POSIX. The
//! underlying types are all implemented in libc for most platforms and either wrapped in safer
//! types here or exported directly.
//!
//! If you are unfamiliar with the `termios` API, you should first read the
//! then come back to understand how `nix` safely wraps it.
//!
//! It should be noted that this API incurs some runtime overhead above the base `libc` definitions.
//! As this interface is not used with high-bandwidth information, this should be fine in most
//! cases. The primary cost when using this API is that the `Termios` datatype here duplicates the
//! standard fields of the underlying `termios` struct and uses safe type wrappers for those fields.
//! This means that when crossing the FFI interface to the underlying C library, data is first
//! copied into the underlying `termios` struct, then the operation is done, and the data is copied
//! back (with additional sanity checking) into the safe wrapper types. The `termios` struct is
//! relatively small across all platforms (on the order of 32-64 bytes).
//!
//! The following examples highlight some of the API use cases such that users coming from using C
//! or reading the standard documentation will understand how to use the safe API exposed here.
//!
//! Example disabling processing of the end-of-file control character:
//!
//! ```
//! # use self::nix::sys::termios::SpecialCharacterIndices::VEOF;
//! # use self::nix::sys::termios::{_POSIX_VDISABLE, Termios};
//! # let mut termios: Termios = unsafe { std::mem::zeroed() };
//! termios.control_chars[VEOF as usize] = _POSIX_VDISABLE;
//! ```
//!
//! The flags within `Termios` are defined as bitfields using the `bitflags` crate. This provides
//! an interface for working with bitfields that is similar to working with the raw unsigned
//! integer types but offers type safety because of the internal checking that values will always
//! be a valid combination of the defined flags.
//!
//! An example showing some of the basic operations for interacting with the control flags:
//!
//! ```
//! # use self::nix::sys::termios::{ControlFlags, Termios};
//! # let mut termios: Termios = unsafe { std::mem::zeroed() };
//! termios.control_flags & ControlFlags::CSIZE == ControlFlags::CS5;
//! termios.control_flags |= ControlFlags::CS5;
//! ```
//!
//! # Baud rates
//!
//! This API is not consistent across platforms when it comes to `BaudRate`: Android and Linux both
//! only support the rates specified by the `BaudRate` enum through their termios API while the BSDs
//! support arbitrary baud rates as the values of the `BaudRate` enum constants are the same integer
//! value of the constant (`B9600` == `9600`). Therefore the `nix::termios` API uses the following
//! conventions:
//!
//! * `cfgetispeed()` - Returns `u32` on BSDs, `BaudRate` on Android/Linux
//! * `cfgetospeed()` - Returns `u32` on BSDs, `BaudRate` on Android/Linux
//! * `cfsetispeed()` - Takes `u32` or `BaudRate` on BSDs, `BaudRate` on Android/Linux
//! * `cfsetospeed()` - Takes `u32` or `BaudRate` on BSDs, `BaudRate` on Android/Linux
//! * `cfsetspeed()` - Takes `u32` or `BaudRate` on BSDs, `BaudRate` on Android/Linux
//!
//! The most common use case of specifying a baud rate using the enum will work the same across
//! platforms:
//!
//! ```rust
//! # use nix::sys::termios::{BaudRate, cfsetispeed, cfsetospeed, cfsetspeed, Termios};
//! # fn main() {
//! # let mut t: Termios = unsafe { std::mem::zeroed() };
//! cfsetispeed(&mut t, BaudRate::B9600).unwrap();
//! cfsetospeed(&mut t, BaudRate::B9600).unwrap();
//! cfsetspeed(&mut t, BaudRate::B9600).unwrap();
//! # }
//! ```
//!
//! Additionally round-tripping baud rates is consistent across platforms:
//!
//! ```rust
//! # use nix::sys::termios::{BaudRate, cfgetispeed, cfgetospeed, cfsetispeed, cfsetspeed, Termios};
//! # fn main() {
//! # let mut t: Termios = unsafe { std::mem::zeroed() };
//! # cfsetspeed(&mut t, BaudRate::B9600).unwrap();
//! let speed = cfgetispeed(&t);
//! assert_eq!(speed, cfgetospeed(&t));
//! cfsetispeed(&mut t, speed).unwrap();
//! # }
//! ```
//!
//! On non-BSDs, `cfgetispeed()` and `cfgetospeed()` both return a `BaudRate`:
//!
#![cfg_attr(bsd, doc = " ```rust,ignore")]
#![cfg_attr(not(bsd), doc = " ```rust")]
//! # use nix::sys::termios::{BaudRate, cfgetispeed, cfgetospeed, cfsetspeed, Termios};
//! # fn main() {
//! # let mut t: Termios = unsafe { std::mem::zeroed() };
//! # cfsetspeed(&mut t, BaudRate::B9600);
//! assert_eq!(cfgetispeed(&t), BaudRate::B9600);
//! assert_eq!(cfgetospeed(&t), BaudRate::B9600);
//! # }
//! ```
//!
//! But on the BSDs, `cfgetispeed()` and `cfgetospeed()` both return `u32`s:
//!
#![cfg_attr(bsd, doc = " ```rust")]
#![cfg_attr(not(bsd), doc = " ```rust,ignore")]
//! # use nix::sys::termios::{BaudRate, cfgetispeed, cfgetospeed, cfsetspeed, Termios};
//! # fn main() {
//! # let mut t: Termios = unsafe { std::mem::zeroed() };
//! # cfsetspeed(&mut t, 9600u32);
//! assert_eq!(cfgetispeed(&t), 9600u32);
//! assert_eq!(cfgetospeed(&t), 9600u32);
//! # }
//! ```
//!
//! It's trivial to convert from a `BaudRate` to a `u32` on BSDs:
//!
#![cfg_attr(bsd, doc = " ```rust")]
#![cfg_attr(not(bsd), doc = " ```rust,ignore")]
//! # use nix::sys::termios::{BaudRate, cfgetispeed, cfsetspeed, Termios};
//! # fn main() {
//! # let mut t: Termios = unsafe { std::mem::zeroed() };
//! # cfsetspeed(&mut t, 9600u32);
//! assert_eq!(cfgetispeed(&t), BaudRate::B9600.into());
//! assert_eq!(u32::from(BaudRate::B9600), 9600u32);
//! # }
//! ```
//!
//! And on BSDs you can specify arbitrary baud rates (**note** this depends on hardware support)
//! by specifying baud rates directly using `u32`s:
//!
#![cfg_attr(bsd, doc = " ```rust")]
#![cfg_attr(not(bsd), doc = " ```rust,ignore")]
//! # use nix::sys::termios::{cfsetispeed, cfsetospeed, cfsetspeed, Termios};
//! # fn main() {
//! # let mut t: Termios = unsafe { std::mem::zeroed() };
//! cfsetispeed(&mut t, 9600u32);
//! cfsetospeed(&mut t, 9600u32);
//! cfsetspeed(&mut t, 9600u32);
//! # }
//! ```
use crate::errno::Errno;
use crate::Result;
use cfg_if::cfg_if;
use libc::{self, c_int, tcflag_t};
use std::cell::{Ref, RefCell};
use std::convert::From;
use std::mem;
use std::os::unix::io::{AsFd, AsRawFd};
#[cfg(feature = "process")]
use crate::unistd::Pid;
/// Stores settings for the termios API
///
/// This is a wrapper around the `libc::termios` struct that provides a safe interface for the
/// standard fields. The only safe way to obtain an instance of this struct is to extract it from
/// an open port using `tcgetattr()`.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Termios {
inner: RefCell<libc::termios>,
/// Input mode flags (see `termios.c_iflag` documentation)
pub input_flags: InputFlags,
/// Output mode flags (see `termios.c_oflag` documentation)
pub output_flags: OutputFlags,
/// Control mode flags (see `termios.c_cflag` documentation)
pub control_flags: ControlFlags,
/// Local mode flags (see `termios.c_lflag` documentation)
pub local_flags: LocalFlags,
/// Control characters (see `termios.c_cc` documentation)
pub control_chars: [libc::cc_t; NCCS],
/// Line discipline (see `termios.c_line` documentation)
#[cfg(linux_android)]
pub line_discipline: libc::cc_t,
/// Line discipline (see `termios.c_line` documentation)
#[cfg(target_os = "haiku")]
pub line_discipline: libc::c_char,
}
impl Termios {
/// Exposes an immutable reference to the underlying `libc::termios` data structure.
///
/// This is not part of `nix`'s public API because it requires additional work to maintain type
/// safety.
pub(crate) fn get_libc_termios(&self) -> Ref<libc::termios> {
{
let mut termios = self.inner.borrow_mut();
termios.c_iflag = self.input_flags.bits();
termios.c_oflag = self.output_flags.bits();
termios.c_cflag = self.control_flags.bits();
termios.c_lflag = self.local_flags.bits();
termios.c_cc = self.control_chars;
#[cfg(any(linux_android, target_os = "haiku"))]
{
termios.c_line = self.line_discipline;
}
}
self.inner.borrow()
}
/// Exposes the inner `libc::termios` datastore within `Termios`.
///
/// This is unsafe because if this is used to modify the inner `libc::termios` struct, it will
/// not automatically update the safe wrapper type around it. In this case it should also be
/// paired with a call to `update_wrapper()` so that the wrapper-type and internal
/// representation stay consistent.
pub(crate) unsafe fn get_libc_termios_mut(&mut self) -> *mut libc::termios {
{
let mut termios = self.inner.borrow_mut();
termios.c_iflag = self.input_flags.bits();
termios.c_oflag = self.output_flags.bits();
termios.c_cflag = self.control_flags.bits();
termios.c_lflag = self.local_flags.bits();
termios.c_cc = self.control_chars;
#[cfg(any(linux_android, target_os = "haiku"))]
{
termios.c_line = self.line_discipline;
}
}
self.inner.as_ptr()
}
/// Updates the wrapper values from the internal `libc::termios` data structure.
pub(crate) fn update_wrapper(&mut self) {
let termios = *self.inner.borrow_mut();
self.input_flags = InputFlags::from_bits_truncate(termios.c_iflag);
self.output_flags = OutputFlags::from_bits_truncate(termios.c_oflag);
self.control_flags = ControlFlags::from_bits_retain(termios.c_cflag);
self.local_flags = LocalFlags::from_bits_truncate(termios.c_lflag);
self.control_chars = termios.c_cc;
#[cfg(any(linux_android, target_os = "haiku"))]
{
self.line_discipline = termios.c_line;
}
}
}
impl From<libc::termios> for Termios {
fn from(termios: libc::termios) -> Self {
Termios {
inner: RefCell::new(termios),
input_flags: InputFlags::from_bits_truncate(termios.c_iflag),
output_flags: OutputFlags::from_bits_truncate(termios.c_oflag),
control_flags: ControlFlags::from_bits_truncate(termios.c_cflag),
local_flags: LocalFlags::from_bits_truncate(termios.c_lflag),
control_chars: termios.c_cc,
#[cfg(any(linux_android, target_os = "haiku"))]
line_discipline: termios.c_line,
}
}
}
impl From<Termios> for libc::termios {
fn from(termios: Termios) -> Self {
termios.inner.into_inner()
}
}
libc_enum! {
/// Baud rates supported by the system.
///
/// For the BSDs, arbitrary baud rates can be specified by using `u32`s directly instead of this
/// enum.
///
/// B0 is special and will disable the port.
#[cfg_attr(target_os = "haiku", repr(u8))]
#[cfg_attr(target_os = "hurd", repr(i32))]
#[cfg_attr(all(apple_targets, target_pointer_width = "64"), repr(u64))]
#[cfg_attr(all(
not(all(apple_targets, target_pointer_width = "64")),
not(target_os = "haiku"),
not(target_os = "hurd")
), repr(u32))]
#[non_exhaustive]
pub enum BaudRate {
B0,
B50,
B75,
B110,
B134,
B150,
B200,
B300,
B600,
B1200,
B1800,
B2400,
B4800,
#[cfg(bsd)]
B7200,
B9600,
#[cfg(bsd)]
B14400,
B19200,
#[cfg(bsd)]
B28800,
B38400,
#[cfg(not(target_os = "aix"))]
B57600,
#[cfg(bsd)]
B76800,
#[cfg(not(target_os = "aix"))]
B115200,
#[cfg(solarish)]
B153600,
#[cfg(not(target_os = "aix"))]
B230400,
#[cfg(solarish)]
B307200,
#[cfg(any(linux_android,
solarish,
target_os = "freebsd",
target_os = "netbsd"))]
B460800,
#[cfg(linux_android)]
B500000,
#[cfg(linux_android)]
B576000,
#[cfg(any(linux_android,
solarish,
target_os = "freebsd",
target_os = "netbsd"))]
B921600,
#[cfg(linux_android)]
B1000000,
#[cfg(linux_android)]
B1152000,
#[cfg(linux_android)]
B1500000,
#[cfg(linux_android)]
B2000000,
#[cfg(any(target_os = "android", all(target_os = "linux", not(target_arch = "sparc64"))))]
B2500000,
#[cfg(any(target_os = "android", all(target_os = "linux", not(target_arch = "sparc64"))))]
B3000000,
#[cfg(any(target_os = "android", all(target_os = "linux", not(target_arch = "sparc64"))))]
B3500000,
#[cfg(any(target_os = "android", all(target_os = "linux", not(target_arch = "sparc64"))))]
B4000000,
}
impl TryFrom<libc::speed_t>
}
#[cfg(bsd)]
impl From<BaudRate> for u32 {
fn from(b: BaudRate) -> u32 {
b as u32
}
}
#[cfg(target_os = "haiku")]
impl From<BaudRate> for u8 {
fn from(b: BaudRate) -> u8 {
b as u8
}
}
// TODO: Add TCSASOFT, which will require treating this as a bitfield.
libc_enum! {
/// Specify when a port configuration change should occur.
///
/// Used as an argument to `tcsetattr()`
#[repr(i32)]
#[non_exhaustive]
pub enum SetArg {
/// The change will occur immediately
TCSANOW,
/// The change occurs after all output has been written
TCSADRAIN,
/// Same as `TCSADRAIN`, but will also flush the input buffer
TCSAFLUSH,
}
}
libc_enum! {
/// Specify a combination of the input and output buffers to flush
///
/// Used as an argument to `tcflush()`.
#[repr(i32)]
#[non_exhaustive]
pub enum FlushArg {
/// Flush data that was received but not read
TCIFLUSH,
/// Flush data written but not transmitted
TCOFLUSH,
/// Flush both received data not read and written data not transmitted
TCIOFLUSH,
}
}
libc_enum! {
/// Specify how transmission flow should be altered
///
/// Used as an argument to `tcflow()`.
#[repr(i32)]
#[non_exhaustive]
pub enum FlowArg {
/// Suspend transmission
TCOOFF,
/// Resume transmission
TCOON,
/// Transmit a STOP character, which should disable a connected terminal device
TCIOFF,
/// Transmit a START character, which should re-enable a connected terminal device
TCION,
}
}
// TODO: Make this usable directly as a slice index.
libc_enum! {
/// Indices into the `termios.c_cc` array for special characters.
#[repr(usize)]
#[non_exhaustive]
pub enum SpecialCharacterIndices {
#[cfg(not(any(target_os = "aix", target_os = "haiku")))]
VDISCARD,
#[cfg(any(bsd,
solarish,
target_os = "aix"))]
VDSUSP,
VEOF,
VEOL,
VEOL2,
VERASE,
#[cfg(any(freebsdlike, solarish))]
VERASE2,
VINTR,
VKILL,
#[cfg(not(target_os = "haiku"))]
VLNEXT,
#[cfg(not(any(all(target_os = "linux", target_arch = "sparc64"),
solarish, target_os = "aix", target_os = "haiku")))]
VMIN,
VQUIT,
#[cfg(not(target_os = "haiku"))]
VREPRINT,
VSTART,
#[cfg(any(bsd, solarish))]
VSTATUS,
VSTOP,
VSUSP,
#[cfg(target_os = "linux")]
VSWTC,
#[cfg(any(solarish, target_os = "haiku"))]
VSWTCH,
#[cfg(not(any(all(target_os = "linux", target_arch = "sparc64"),
solarish, target_os = "aix", target_os = "haiku")))]
VTIME,
#[cfg(not(any(target_os = "aix", target_os = "haiku")))]
VWERASE,
#[cfg(target_os = "dragonfly")]
VCHECKPT,
}
}
#[cfg(any(
all(target_os = "linux", target_arch = "sparc64"),
solarish,
target_os = "aix",
target_os = "haiku",
))]
impl SpecialCharacterIndices {
pub const VMIN: SpecialCharacterIndices = SpecialCharacterIndices::VEOF;
pub const VTIME: SpecialCharacterIndices = SpecialCharacterIndices::VEOL;
}
pub use libc::NCCS;
#[cfg(any(linux_android, target_os = "aix", bsd))]
pub use libc::_POSIX_VDISABLE;
libc_bitflags! {
/// Flags for configuring the input mode of a terminal
pub struct InputFlags: tcflag_t {
IGNBRK;
BRKINT;
IGNPAR;
PARMRK;
INPCK;
ISTRIP;
INLCR;
IGNCR;
ICRNL;
IXON;
IXOFF;
#[cfg(not(target_os = "redox"))]
IXANY;
#[cfg(not(any(target_os = "redox", target_os = "haiku")))]
IMAXBEL;
#[cfg(any(linux_android, apple_targets))]
IUTF8;
}
}
libc_bitflags! {
/// Flags for configuring the output mode of a terminal
pub struct OutputFlags: tcflag_t {
OPOST;
#[cfg(any(linux_android,
target_os = "haiku",
target_os = "openbsd"))]
OLCUC;
ONLCR;
OCRNL as tcflag_t;
ONOCR as tcflag_t;
ONLRET as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
OFDEL as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
NL0 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
NL1 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
CR0 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
CR1 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
CR2 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
CR3 as tcflag_t;
#[cfg(any(linux_android,
target_os = "freebsd",
target_os = "haiku",
apple_targets))]
TAB0 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
TAB1 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
TAB2 as tcflag_t;
#[cfg(any(linux_android,
target_os = "freebsd",
target_os = "haiku",
apple_targets))]
TAB3 as tcflag_t;
#[cfg(linux_android)]
XTABS;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
BS0 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
BS1 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
VT0 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
VT1 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
FF0 as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
FF1 as tcflag_t;
#[cfg(bsd)]
OXTABS;
#[cfg(bsd)]
ONOEOT as tcflag_t;
// Bitmasks for use with OutputFlags to select specific settings
// These should be moved to be a mask once https://github.com/rust-lang-nursery/bitflags/issues/110
// is resolved.
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
NLDLY as tcflag_t; // FIXME: Datatype needs to be corrected in libc for mac
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
CRDLY as tcflag_t;
#[cfg(any(linux_android,
target_os = "freebsd",
target_os = "haiku",
apple_targets))]
TABDLY as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
BSDLY as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
VTDLY as tcflag_t;
#[cfg(any(linux_android,
target_os = "haiku",
apple_targets))]
FFDLY as tcflag_t;
}
}
libc_bitflags! {
/// Flags for setting the control mode of a terminal
pub struct ControlFlags: tcflag_t {
#[cfg(bsd)]
CIGNORE;
CS5;
CS6;
CS7;
CS8;
CSTOPB;
CREAD;
PARENB;
PARODD;
HUPCL;
CLOCAL;
#[cfg(not(any(target_os = "redox", target_os = "aix")))]
CRTSCTS;
#[cfg(linux_android)]
CBAUD;
#[cfg(any(target_os = "android", all(target_os = "linux", not(target_arch = "mips"))))]
CMSPAR;
#[cfg(any(target_os = "android",
all(target_os = "linux",
not(any(target_arch = "powerpc", target_arch = "powerpc64")))))]
CIBAUD;
#[cfg(linux_android)]
CBAUDEX;
#[cfg(bsd)]
MDMBUF;
#[cfg(netbsdlike)]
CHWFLOW;
#[cfg(any(freebsdlike, netbsdlike))]
CCTS_OFLOW;
#[cfg(any(freebsdlike, netbsdlike))]
CRTS_IFLOW;
#[cfg(freebsdlike)]
CDTR_IFLOW;
#[cfg(freebsdlike)]
CDSR_OFLOW;
#[cfg(freebsdlike)]
CCAR_OFLOW;
// Bitmasks for use with ControlFlags to select specific settings
// These should be moved to be a mask once https://github.com/rust-lang-nursery/bitflags/issues/110
// is resolved.
CSIZE;
}
}
libc_bitflags! {
/// Flags for setting any local modes
pub struct LocalFlags: tcflag_t {
#[cfg(not(target_os = "redox"))]
ECHOKE;
ECHOE;
ECHOK;
ECHO;
ECHONL;
#[cfg(not(target_os = "redox"))]
ECHOPRT;
#[cfg(not(target_os = "redox"))]
ECHOCTL;
ISIG;
ICANON;
#[cfg(bsd)]
ALTWERASE;
IEXTEN;
#[cfg(not(any(target_os = "redox", target_os = "haiku", target_os = "aix")))]
EXTPROC;
TOSTOP;
#[cfg(not(target_os = "redox"))]
FLUSHO;
#[cfg(bsd)]
NOKERNINFO;
#[cfg(not(target_os = "redox"))]
PENDIN;
NOFLSH;
}
}
cfg_if! {
if #[cfg(bsd)] {
/// Get input baud rate (see
///
/// `cfgetispeed()` extracts the input baud rate from the given `Termios` structure.
// The cast is not unnecessary on all platforms.
#[allow(clippy::unnecessary_cast)]
pub fn cfgetispeed(termios: &Termios) -> u32 {
let inner_termios = termios.get_libc_termios();
unsafe { libc::cfgetispeed(&*inner_termios) as u32 }
}
/// Get output baud rate (see
///
/// `cfgetospeed()` extracts the output baud rate from the given `Termios` structure.
// The cast is not unnecessary on all platforms.
#[allow(clippy::unnecessary_cast)]
pub fn cfgetospeed(termios: &Termios) -> u32 {
let inner_termios = termios.get_libc_termios();
unsafe { libc::cfgetospeed(&*inner_termios) as u32 }
}
/// Set input baud rate (see
///
/// `cfsetispeed()` sets the intput baud rate in the given `Termios` structure.
pub fn cfsetispeed<T: Into<u32>>(termios: &mut Termios, baud: T) -> Result<()> {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
let res = unsafe { libc::cfsetispeed(inner_termios, baud.into() as libc::speed_t) };
termios.update_wrapper();
Errno::result(res).map(drop)
}
/// Set output baud rate (see
///
/// `cfsetospeed()` sets the output baud rate in the given termios structure.
pub fn cfsetospeed<T: Into<u32>>(termios: &mut Termios, baud: T) -> Result<()> {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
let res = unsafe { libc::cfsetospeed(inner_termios, baud.into() as libc::speed_t) };
termios.update_wrapper();
Errno::result(res).map(drop)
}
/// Set both the input and output baud rates (see
///
/// `cfsetspeed()` sets the input and output baud rate in the given termios structure. Note that
/// this is part of the 4.4BSD standard and not part of POSIX.
pub fn cfsetspeed<T: Into<u32>>(termios: &mut Termios, baud: T) -> Result<()> {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
let res = unsafe { libc::cfsetspeed(inner_termios, baud.into() as libc::speed_t) };
termios.update_wrapper();
Errno::result(res).map(drop)
}
} else {
use std::convert::TryInto;
/// Get input baud rate (see
///
/// `cfgetispeed()` extracts the input baud rate from the given `Termios` structure.
pub fn cfgetispeed(termios: &Termios) -> BaudRate {
let inner_termios = termios.get_libc_termios();
unsafe { libc::cfgetispeed(&*inner_termios) }.try_into().unwrap()
}
/// Get output baud rate (see
///
/// `cfgetospeed()` extracts the output baud rate from the given `Termios` structure.
pub fn cfgetospeed(termios: &Termios) -> BaudRate {
let inner_termios = termios.get_libc_termios();
unsafe { libc::cfgetospeed(&*inner_termios) }.try_into().unwrap()
}
/// Set input baud rate (see
///
/// `cfsetispeed()` sets the intput baud rate in the given `Termios` structure.
pub fn cfsetispeed(termios: &mut Termios, baud: BaudRate) -> Result<()> {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
let res = unsafe { libc::cfsetispeed(inner_termios, baud as libc::speed_t) };
termios.update_wrapper();
Errno::result(res).map(drop)
}
/// Set output baud rate (see
///
/// `cfsetospeed()` sets the output baud rate in the given `Termios` structure.
pub fn cfsetospeed(termios: &mut Termios, baud: BaudRate) -> Result<()> {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
let res = unsafe { libc::cfsetospeed(inner_termios, baud as libc::speed_t) };
termios.update_wrapper();
Errno::result(res).map(drop)
}
/// Set both the input and output baud rates (see
///
/// `cfsetspeed()` sets the input and output baud rate in the given `Termios` structure. Note that
/// this is part of the 4.4BSD standard and not part of POSIX.
#[cfg(not(target_os = "haiku"))]
pub fn cfsetspeed(termios: &mut Termios, baud: BaudRate) -> Result<()> {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
let res = unsafe { libc::cfsetspeed(inner_termios, baud as libc::speed_t) };
termios.update_wrapper();
Errno::result(res).map(drop)
}
}
}
/// Configures the port to something like the "raw" mode of the old Version 7 terminal driver (see
///
/// `cfmakeraw()` configures the termios structure such that input is available character-by-
/// character, echoing is disabled, and all special input and output processing is disabled. Note
/// that this is a non-standard function, but is available on Linux and BSDs.
pub fn cfmakeraw(termios: &mut Termios) {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
unsafe {
libc::cfmakeraw(inner_termios);
}
termios.update_wrapper();
}
/// Configures the port to "sane" mode (like the configuration of a newly created terminal) (see
///
/// Note that this is a non-standard function, available on FreeBSD.
#[cfg(target_os = "freebsd")]
pub fn cfmakesane(termios: &mut Termios) {
let inner_termios = unsafe { termios.get_libc_termios_mut() };
unsafe {
libc::cfmakesane(inner_termios);
}
termios.update_wrapper();
}
/// Return the configuration of a port
///
/// `tcgetattr()` returns a `Termios` structure with the current configuration for a port. Modifying
/// this structure *will not* reconfigure the port, instead the modifications should be done to
/// the `Termios` structure and then the port should be reconfigured using `tcsetattr()`.
pub fn tcgetattr<Fd: AsFd>(fd: Fd) -> Result<Termios> {
let mut termios = mem::MaybeUninit::uninit();
let res = unsafe {
libc::tcgetattr(fd.as_fd().as_raw_fd(), termios.as_mut_ptr())
};
Errno::result(res)?;
unsafe { Ok(termios.assume_init().into()) }
}
/// Set the configuration for a terminal (see
///
/// `tcsetattr()` reconfigures the given port based on a given `Termios` structure. This change
/// takes affect at a time specified by `actions`. Note that this function may return success if
/// *any* of the parameters were successfully set, not only if all were set successfully.
pub fn tcsetattr<Fd: AsFd>(
fd: Fd,
actions: SetArg,
termios: &Termios,
) -> Result<()> {
let inner_termios = termios.get_libc_termios();
Errno::result(unsafe {
libc::tcsetattr(
fd.as_fd().as_raw_fd(),
actions as c_int,
&*inner_termios,
)
})
.map(drop)
}
/// Block until all output data is written (see
pub fn tcdrain<Fd: AsFd>(fd: Fd) -> Result<()> {
Errno::result(unsafe { libc::tcdrain(fd.as_fd().as_raw_fd()) }).map(drop)
}
/// Suspend or resume the transmission or reception of data (see
///
/// `tcflow()` suspends of resumes the transmission or reception of data for the given port
/// depending on the value of `action`.
pub fn tcflow<Fd: AsFd>(fd: Fd, action: FlowArg) -> Result<()> {
Errno::result(unsafe {
libc::tcflow(fd.as_fd().as_raw_fd(), action as c_int)
})
.map(drop)
}
/// Discard data in the output or input queue (see
///
/// `tcflush()` will discard data for a terminal port in the input queue, output queue, or both
/// depending on the value of `action`.
pub fn tcflush<Fd: AsFd>(fd: Fd, action: FlushArg) -> Result<()> {
Errno::result(unsafe {
libc::tcflush(fd.as_fd().as_raw_fd(), action as c_int)
})
.map(drop)
}
/// Send a break for a specific duration (see
///
/// When using asynchronous data transmission `tcsendbreak()` will transmit a continuous stream
/// of zero-valued bits for an implementation-defined duration.
pub fn tcsendbreak<Fd: AsFd>(fd: Fd, duration: c_int) -> Result<()> {
Errno::result(unsafe {
libc::tcsendbreak(fd.as_fd().as_raw_fd(), duration)
})
.map(drop)
}
feature! {
#![feature = "process"]
/// Get the session controlled by the given terminal (see
pub fn tcgetsid<Fd: AsFd>(fd: Fd) -> Result<Pid> {
let res = unsafe { libc::tcgetsid(fd.as_fd().as_raw_fd()) };
Errno::result(res).map(Pid::from_raw)
}
}