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use nix::libc::{self, c_int};
use nix::{
errno::Errno,
sys::wait::WaitStatus,
unistd::Pid
};
use std::time::{ Instant, Duration };
use std::process::Child;
use std::thread;
use std::sync::mpsc;
mod error;
mod rusage_ffi;
pub use rusage_ffi::Rusage;
pub use error::WaitError;
#[derive(Debug)]
pub struct WaitInfo {
pub status: WaitStatus,
pub usage: Rusage,
pub wall_time: Duration
}
fn wait4_pid(
pid: Pid,
chan: mpsc::Sender<std::result::Result<WaitInfo, nix::Error>>,
timer: Instant
) {
let mut status: c_int = 0;
let mut usg: libc::rusage;
let wait_ret;
unsafe {
usg = std::mem::zeroed();
wait_ret = libc::wait4(pid.as_raw(), &mut status, 0 as c_int, &mut usg);
}
#[allow(unused_must_use)] {
chan.send(match wait_ret {
-1 => Err(nix::Error::Sys(Errno::last())),
_ => WaitStatus::from_raw(pid, status).map(|nix_status| {
WaitInfo {
status: nix_status,
usage: usg.into(),
wall_time: timer.elapsed()
}
}
)
});
};
}
pub fn wait_child(
mut child: Child,
timeout: Duration,
timer: Instant
) -> Result<WaitInfo, WaitError> {
let pid = Pid::from_raw(child.id() as i32);
let (send, recv) = mpsc::channel();
let thr = thread::spawn(move || wait4_pid(pid, send, timer));
match recv.recv_timeout(timeout) {
Ok(Ok(usg)) => Ok(usg),
Ok(Err(err)) => Err(err.into()),
Err(mpsc::RecvTimeoutError::Timeout) => {
drop(recv);
drop(thr);
#[allow(unused_must_use)] {
child.kill();
}
Err(WaitError::TimedOut(timeout))
},
Err(mpsc::RecvTimeoutError::Disconnected) => unreachable!()
}
}
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