Rust sichld handle

main.rs

#[cfg(unix)]
use nix::{
    sys::{
        signal::{sigaction, SaFlags, SigAction, SigHandler, SigSet, Signal},
        wait::{waitpid, WaitPidFlag, WaitStatus},
    },
    unistd::Pid,
};

// Note: Signal handler should be written with great care. E.g if you
// ever want to print from this function you need to use libc write
#[cfg(unix)]
extern "C" fn handle_sigchld(_sig: libc::c_int) {
    loop {
        match waitpid(Pid::from_raw(-1), Some(WaitPidFlag::WNOHANG)) {
            Ok(WaitStatus::StillAlive) => break,
            _ => (),
        }
    }
}



fn main() {
    #[cfg(unix)]
    {
        let sig_action = SigAction::new(
            SigHandler::Handler(handle_sigchld),
            SaFlags::empty(),
            SigSet::empty(),
        );
        if let Err(err) = unsafe { sigaction(Signal::SIGCHLD, &sig_action) } {
            panic!("sigaction() failed: {}", err);
        };
    }
}