libc_tools/
wait.rs

1use std::fmt::Display;
2
3#[derive(Debug)]
4pub enum Wait {
5    WaitFailure(i32),
6    WNoHangExit,
7    ErrnoNotFound,
8}
9
10impl Display for Wait {
11    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
12        f.write_str(match *self {
13            Wait::ErrnoNotFound => "errno not found!",
14            _ => "exec failed!",
15        })
16    }
17}
18
19impl Wait {
20    pub fn children() -> Result<(libc::pid_t, libc::c_int), Wait> {
21        let mut status = 0;
22        let result = unsafe { libc::wait(&mut status as *mut libc::c_int) };
23        let errno = unsafe { libc::__errno_location() };
24        if errno == std::ptr::null_mut::<libc::c_int>() {
25            Err(Wait::ErrnoNotFound)
26        } else {
27            match result {
28                -1 => Err(Wait::WaitFailure(unsafe { *errno })),
29                _ => Ok((result, status)),
30            }
31        }
32    }
33    pub fn  children_with(
34        pid: libc::pid_t,
35        options: libc::c_int,
36    ) -> Result<(libc::pid_t, libc::c_int), Wait> {
37        let mut w_status = 0;
38        let result = unsafe { libc::waitpid(pid, &mut w_status as *mut libc::c_int, options) };
39        let errno = unsafe { libc::__errno_location() };
40        if errno == std::ptr::null_mut::<libc::c_int>() {
41            Err(Wait::ErrnoNotFound)
42        } else {
43            match result {
44                0 if options & libc::WNOHANG != 0 => Err(Wait::WNoHangExit),
45                -1 => Err(Wait::WaitFailure(unsafe { *errno })),
46                _ => Ok((result, w_status)),
47            }
48        }
49    }
50}
libc_tools/wait.rs

libc_tools/
wait.rs
