pub unsafe extern "C" fn g_spawn_sync(
working_directory: *const gchar,
argv: *mut *mut gchar,
envp: *mut *mut gchar,
flags: GSpawnFlags,
child_setup: GSpawnChildSetupFunc,
user_data: gpointer,
standard_output: *mut *mut gchar,
standard_error: *mut *mut gchar,
wait_status: *mut gint,
error: *mut *mut GError,
) -> gboolean