Function _waitpid

src/backend/linux_raw/process/syscalls.rs:298–313

(
    pid: RawPid,
    waitopts: WaitOptions,
)

#[inline]
pub(crate) fn _waitpid(
    pid: RawPid,
    waitopts: WaitOptions,
) -> io::Result<Option<(Pid, WaitStatus)>> {
    unsafe {
        let mut status = MaybeUninit::<i32>::uninit();
        let pid = ret_c_int(syscall!(
            __NR_wait4,
            c_int(pid as _),
            &mut status,
            c_int(waitopts.bits() as _),
            zero()
        ))?;
        Ok(Pid::from_raw(pid).map(|pid| (pid, WaitStatus::new(status.assume_init()))))
    }
}

#[inline]
pub(crate) fn waitid(id: WaitId<'_>, options: WaitIdOptions) -> io::Result<Option<WaitIdStatus>> {