GLib.child_watch_add

function child_watch_add(priority: Number(gint), pid: GLib.Pid, function: GLib.ChildWatchFunc): Number(guint) {
    // Gjs wrapper for g_child_watch_add_full()
}
  

Sets a function to be called when the child indicated by pid exits, at the priority priority.

If you obtain pid from GLib.spawn_async or GLib.spawn_async_with_pipes you will need to pass #G_SPAWN_DO_NOT_REAP_CHILD as flag to the spawn function for the child watching to work.

In many programs, you will want to call GLib.spawn_check_exit_status in the callback to determine whether or not the child exited successfully.

Also, note that on platforms where GLib.Pid must be explicitly closed (see GLib.spawn_close_pid) pid must not be closed while the source is still active. Typically, you should invoke GLib.spawn_close_pid in the callback function for the source.

GLib supports only a single callback per process id.

This internally creates a main loop source using GLib.child_watch_source_new and attaches it to the main loop context using GLib.Source.prototype.attach. You can do these steps manually if you need greater control.

Since 2.4