use nix;

fn main() {
    let uid = getuid();
    let gid = getgid();
    let login_user = getlogin(uid);
    println!("uid: {} gid: {} name: {}", uid, gid, login_user);
}

fn getlogin(uid: u32) -> &'static str {
    use std::ffi::CStr;
    let user_passwd = unsafe { nix::libc::getpwuid(uid)};
    let c_str  = unsafe { CStr::from_ptr((*user_passwd).pw_name)} ;
    return c_str.to_str().unwrap();
}

fn getuid() -> u32 {
    let uid_struct = nix::unistd::getuid();
    return uid_struct.as_raw();
}

fn getgid() -> u32 {
    let gid_struct = nix::unistd::getgid();
    return gid_struct.as_raw();
}