let mut statbuf = nc::stat_t::default();
match unsafe { nc::stat("/etc/passwd", &mut statbuf) } {
    Ok(_) => println!("s: {:?}", statbuf),
    Err(errno) => eprintln!("Failed to get file status, got errno: {}", errno),
}

let errno = nc::EPERM;
println!("err: {:?}", nc::strerror(errno);

let pid = unsafe { nc::fork() };
match pid {
    Ok(0) => {
        println!("child process");
        let args = ["ls", "-l", "-a"];
        let env = ["FOO=BAR"];
        match unsafe { nc::execve("/bin/ls", &args, &env) } {
            Ok(_) => {},
            Err(errno) => eprintln!("`ls` got err: {}", errno),
        }
    }
    Ok(pid) => println!("[parent] child pid: {pid} "),
    Err(errno) => eprintln!("errno: {}", errno),
}

let pid = unsafe { nc::getpid() };
let ret = unsafe { nc::kill(pid, nc::SIGTERM) };
// Never reach here.
println!("ret: {:?}", ret);

fn handle_alarm(signum: i32) {
    assert_eq!(signum, nc::SIGALRM);
}

fn main() {
    #[cfg(nc_has_sa_restorer)]
    let sa = nc::sigaction_t {
        sa_handler: handle_alarm as nc::sighandler_t,
        sa_flags: nc::SA_RESTORER | nc::SA_RESTART,
        sa_restorer: nc::restore::get_sa_restorer(),
        ..nc::sigaction_t::default()
    };
    #[cfg(not(nc_has_sa_restorer))]
    let sa = nc::sigaction_t {
        sa_handler: handle_alarm as nc::sighandler_t,
        sa_flags: nc::SA_RESTART,
        ..nc::sigaction_t::default()
    };
    let ret = unsafe { nc::rt_sigaction(nc::SIGALRM, Some(&sa), None) };
    assert!(ret.is_ok());
    let remaining = unsafe { nc::alarm(1) };
    let mask = nc::sigset_t::default();
    let ret = unsafe { nc::rt_sigsuspend(&mask) };
    assert!(ret.is_err());
    assert_eq!(ret, Err(nc::EINTR));
    assert_eq!(remaining, Ok(0));
}