use libc::{pid_t, 
           SIGCHLD, 
           waitpid, 
           WNOHANG, 
           sigaction, 
           sigemptyset,  
           SA_RESTART};

use std::ffi::c_int; 

fn sigchild_handler(_signal: c_int) {
    loop {
        let mut status: c_int = 0; 
        let pid: pid_t = unsafe {
            waitpid(-1 , &mut status, WNOHANG)
        }; 

        if pid <= 0 {
            break; 
        }
    }

}

pub fn sigchild_handler() -> Result<(), Box<dyn std::error::Error>> {
    unsafe {
        let mut sigact: sigaction = std::mem::zeroed(); 
        sigact.sa_sigaction = sigchild_handler as usize; 
        sigemptyset(&mut sigact.sa_mask); 
        sigact.sa_flags = SA_RESTART; 

        if sigaction(SIGCHLD, &sigact, std::ptr::null_mut()) == -1 {
            Err("Sigaction check returned -1".into())
        } else { 
            Ok(()) 
        }
    }
}