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#![cfg(any(target_os = "linux", target_os = "android"))]
#[macro_use]
extern crate nix;
extern crate libc;
use nix::errno::Errno;
use std::error;
use std::fs::{File, OpenOptions};
use std::os::unix::fs::OpenOptionsExt;
use std::os::unix::io::AsRawFd;
mod ioctl {
ioctl_write_ptr!(tiocsptlck, 'T', 0x31, libc::c_int);
ioctl_read!(tiocgptn, 'T', 0x30, libc::c_uint);
ioctl_write_ptr_bad!(tiocswinsz, libc::TIOCSWINSZ, libc::winsize);
}
pub fn openpty(
termios: Option<&libc::termios>,
winsize: Option<&libc::winsize>,
name: Option<String>,
) -> Result<(File, File, String), Box<error::Error>> {
let master = OpenOptions::new()
.read(true)
.write(true)
.custom_flags(libc::O_NOCTTY)
.open("/dev/ptmx")?;
let mut pts_number = 0;
unsafe {
ioctl::tiocsptlck(master.as_raw_fd(), &mut (pts_number as libc::c_int))?;
ioctl::tiocgptn(master.as_raw_fd(), &mut pts_number)?;
}
let name = name.unwrap_or_else(|| format!("/dev/pts/{}", pts_number));
let slave = OpenOptions::new()
.read(true)
.write(true)
.custom_flags(libc::O_NOCTTY)
.open(&name)?;
if let Some(tio) = termios {
Errno::result(unsafe { libc::tcsetattr(slave.as_raw_fd(), libc::TCSANOW, tio) })?;
}
if let Some(ws) = winsize {
unsafe {
ioctl::tiocswinsz(slave.as_raw_fd(), ws)?;
}
}
Ok((master, slave, name))
}