Function posix_spawn 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn posix_spawn(
    pid: *mut c_int,
    path: *const c_char,
    fa: *const posix_spawn_file_actions_t,
    attrp: *const posix_spawnattr_t,
    argv: *const *const c_char,
    envp: *const *const c_char,
) -> c_int