posix_spawn_file_actions_addopen
if (posix_spawn_file_actions_addopen(&file_actions, 0, "/dev/null",
extern int posix_spawn_file_actions_addopen(
error = posix_spawn_file_actions_addopen(&fact, 2,
if ((ret = posix_spawn_file_actions_addopen(acts, STDIN_FILENO,
ret = posix_spawn_file_actions_addopen(&acts, SPAWN_FD,
if ((ret = posix_spawn_file_actions_addopen(&acts, -23, "/dev/null",