Function waitid

pub unsafe fn waitid(
    which: i32,
    pid: i32,
    info: &mut siginfo_t,
    options: i32,
    ru: Option<&mut rusage_t>,
) -> Result<(), i32> 

Available on crate feature dep_nc only.

Wait for process to change state.

Examples

let pid = unsafe { nc::fork() };

match pid {
    Err(errno) => {
        eprintln!("fork() error: {}", nc::strerror(errno));
        unsafe { nc::exit(1) };
    }
    Ok(0) => println!("[child] pid is: {}", unsafe { nc::getpid() }),
    Ok(pid) => {
        let mut info = nc::siginfo_t::default();
        let options = nc::WEXITED;
        let ret = unsafe { nc::waitid(nc::P_ALL, -1, &mut info, options, None) };
        match ret {
            Err(errno) => eprintln!("waitid() error: {}", nc::strerror(errno)),
            Ok(()) => {
                let exited_pid = unsafe { info.siginfo.sifields.sigchld.pid };
                assert_eq!(pid, exited_pid);
            }
        }
    }
}