1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
use nix::libc::{self, c_int};
use nix::{errno::Errno, sys::wait::WaitStatus, unistd::Pid};
use std::convert::{TryFrom, TryInto};
use std::process::Child;
use std::sync::mpsc;
use std::thread;
use std::time::{Duration, Instant};
mod error;
mod rusage_ffi;
pub use rusage_ffi::Rusage;
use error::ProcessSignalInfo;
pub use error::WaitError;
#[derive(Debug)]
struct WaitInfo {
pub status: WaitStatus,
pub usage: Rusage,
pub wall_time: Duration,
}
#[derive(Debug)]
pub struct ChildExitStatus {
pub usage: Rusage,
pub wall_time: Duration,
}
impl TryFrom<WaitInfo> for ChildExitStatus {
type Error = WaitError;
fn try_from(info: WaitInfo) -> Result<Self, Self::Error> {
match info.status {
WaitStatus::Exited(pid, ret) => match ret {
0 => Ok(ChildExitStatus {
usage: info.usage,
wall_time: info.wall_time,
}),
_ => Err(WaitError::ReturnNonZero(ret, pid)),
},
WaitStatus::Signaled(pid, signal, coredump) => {
Err(WaitError::Signaled(ProcessSignalInfo {
pid,
signal,
coredump,
}))
}
_ => Err(WaitError::NotExited),
}
}
}
#[cfg(target_os = "macos")]
#[link(name = "c")]
extern "C" {
fn wait4(
pid: libc::pid_t,
status: *mut c_int,
options: c_int,
rusage: *mut libc::rusage,
) -> libc::pid_t;
}
#[cfg(target_os = "linux")]
use libc::wait4;
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 = 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<ChildExitStatus, 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(wait_info)) => wait_info.try_into(),
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!(),
}
}
|
