Function libc::posix_spawn

pub unsafe extern "C" fn posix_spawn(
    pid: *mut pid_t, 
    path: *const c_char, 
    file_actions: *const posix_spawn_file_actions_t, 
    attrp: *const posix_spawnattr_t, 
    argv: *const *mut c_char, 
    envp: *const *mut c_char
) -> c_int