Example: Spawn, async

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public static int main (string[] args) {
	MainLoop loop = new MainLoop ();
	try {
		string[] spawn_args = {"ls", "-l", "-h"};
		string[] spawn_env = Environ.get ();
		Pid child_pid;

		Process.spawn_async ("/",
			spawn_args,
			spawn_env,
			SpawnFlags.SEARCH_PATH | SpawnFlags.DO_NOT_REAP_CHILD,
			null,
			out child_pid);

		ChildWatch.add (child_pid, (pid, status) => {
			// Triggered when the child indicated by child_pid exits
			Process.close_pid (pid);
			loop.quit ();
		});

		loop.run ();
	} catch (SpawnError e) {
		print ("Error: %s\n", e.message);
	}
	return 0;
}

 valac --pkg glib-2.0 GLib.Process.spawn_async.vala

See:

• GLib.Process.spawn_async

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