posix_spawn_file_actions_addclosefrom_np
err = posix_spawn_file_actions_addclosefrom_np(&fact,
err = posix_spawn_file_actions_addclosefrom_np(&factions,
extern int posix_spawn_file_actions_addclosefrom_np(
ret = posix_spawn_file_actions_addclosefrom_np(acts, 11);
ret = posix_spawn_file_actions_addclosefrom_np(acts, 3);