Crate termios [−] [src]
The termios
crate provides Rust bindings for the POSIX termios API that is implemented on
Unix operating systems. The termios API is defined in the IEEE Std 1003.1 ("POSIX.1")
specification.
Getting Started
The termios API operates on file descriptors that are associated with terminal devices, e.g.,
/dev/tty*
. When used with other file descriptors, termios functions return an error. All
functions that are part of the POSIX standard are included in the termios
crate. Where file
descriptors are expected, the type std::os::unix::io::RawFd
is used, and integer error codes
are translated to std::io::Result
.
A major feature of the termios API is configuring a terminal device's parameters. The POSIX
standard defines a termios
structure that contains the parameters and several functions for
manipulating the parameters. The termios
crate defines a safe constructor that returns a
Termios
struct populated with the parameters of an open terminal
device:
use termios::*; let mut termios = Termios::from_fd(fd).unwrap();
The Termios
struct provides access to the fields defined in the POSIX
standard (c_iflag
, c_oflag
, c_cflag
, c_lflag
, and c_cc
):
termios.c_cflag |= CREAD | CLOCAL; termios.c_lflag &= !(ICANON | ECHO | ECHOE | ECHOK | ECHONL | ISIG | IEXTEN); termios.c_oflag &= !OPOST; termios.c_iflag &= !(INLCR | IGNCR | ICRNL | IGNBRK); termios.c_cc[VMIN] = 0; termios.c_cc[VTIME] = 0;
The Termios
struct can also be manipulated using any of the standard
termios API functions:
cfgetispeed(&termios); cfgetospeed(&termios); cfsetispeed(&mut termios, B9600).unwrap(); cfsetospeed(&mut termios, B9600).unwrap(); tcsetattr(fd, TCSANOW, &termios).unwrap();
Portability
The termios
crate is organized in a way to help write portable code, while also allowing
access to OS-specific functionality when necessary.
The crate root contains types, constants, and function definitions that are common across Unix operating systems. Most of the definitions in the crate root are from the POSIX standard; however, support for the standard may differ across operating systems. A couple functions in the crate root are not part of the POSIX standard, but are included in the crate root because they are widely available across Unix operating systems.
To write portable code, import the termios
crate and use only the definitions from the crate
root.
OS-Specific Extensions
Each operating system may define extensions to the POSIX API. To make it clear when code
depends on OS-specific definitions, any non-standard definitions are exported in the
termios::os
module. Programs that depend on OS-specific functionality must explicity opt-in.
When writing portable code that depends on OS-specific definitions, it will often be necessary
to use #[cfg(...)]
attributes to support alternative implementations. The following is an
example of a portable function that sets the maximum speed on a Termios
struct.
use std::io; use termios::{Termios,cfsetspeed}; #[cfg(target_os = "linux")] fn set_fastest_speed(termios: &mut Termios) -> io::Result<()> { cfsetspeed(termios, termios::os::linux::B4000000) } #[cfg(target_os = "macos")] fn set_fastest_speed(termios: &mut Termios) -> io::Result<()> { cfsetspeed(termios, termios::os::macos::B230400) } #[cfg(target_os = "freebsd")] fn set_fastest_speed(termios: &mut Termios) -> io::Result<()> { cfsetspeed(termios, termios::os::freebsd::B921600) } #[cfg(target_os = "openbsd")] fn set_fastest_speed(termios: &mut Termios) -> io::Result<()> { cfsetspeed(termios, termios::os::openbsd::B921600) } let mut termios = Termios::from_fd(fd).unwrap(); set_fastest_speed(&mut termios).unwrap();
Reexports
pub use os::target::{cc_t, speed_t, tcflag_t}; |
pub use os::target::{VEOF, VEOL, VERASE, VINTR, VKILL, VMIN, VQUIT, VSTART, VSTOP, VSUSP, VTIME}; |
pub use os::target::{BRKINT, ICRNL, IGNBRK, IGNCR, IGNPAR, INLCR, INPCK, ISTRIP, IXANY, IXOFF, IXON, PARMRK}; |
pub use os::target::{OPOST, ONLCR, OCRNL, TAB3, ONOCR, ONLRET}; |
pub use os::target::{B0, B50, B75, B110, B134, B150, B200, B300, B600, B1200, B1800, B2400, B4800, B9600, B19200, B38400}; |
pub use os::target::{CSIZE, CS5, CS6, CS7, CS8, CSTOPB, CREAD, PARENB, PARODD, HUPCL, CLOCAL}; |
pub use os::target::{ECHO, ECHOE, ECHOK, ECHONL, ICANON, IEXTEN, ISIG, NOFLSH, TOSTOP}; |
pub use os::target::{TCSANOW, TCSADRAIN, TCSAFLUSH}; |
pub use os::target::{TCIFLUSH, TCIOFLUSH, TCOFLUSH, TCIOFF, TCION, TCOOFF, TCOON}; |
Modules
ffi |
Unsafe FFI bindings. |
os |
OS-specific definitions. |
Structs
Termios |
Unix terminal I/O control structure. |
Functions
cfgetispeed |
Gets the input baud rate stored in a |
cfgetospeed |
Gets the output baud rate stored in a |
cfmakeraw |
Sets flags to disable all input and output processing. |
cfsetispeed |
Sets the input baud rate. |
cfsetospeed |
Sets the output baud rate. |
cfsetspeed |
Sets input and output baud rates. |
tcdrain |
Blocks until all output written to the file descriptor is transmitted. |
tcflow |
Suspends or restarts transmission or reception of data. |
tcflush |
Discards data waiting in the terminal device's buffers. |
tcgetattr |
Populates a |
tcgetsid |
Returns the process group ID of the controlling terminal's session. |
tcsendbreak |
Transmits data to generate a break condition. |
tcsetattr |
Sets a terminal device's parameters. |