since: 2.4


g_child_watch_add_full (
  gint priority,
  GPid pid,
  GChildWatchFunc function,
  gpointer data,
  GDestroyNotify notify


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

If you obtain pid from g_spawn_async() or g_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 g_spawn_check_wait_status() in the callback to determine whether or not the child exited successfully.

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

GLib supports only a single callback per process id. On POSIX platforms, the same restrictions mentioned for g_child_watch_source_new() apply to this function.

This internally creates a main loop source using g_child_watch_source_new() and attaches it to the main loop context using g_source_attach(). You can do these steps manually if you need greater control.

Available since: 2.4

This method is renamed to g_child_watch_add() in language bindings



Type: gint

The priority of the idle source. Typically this will be in the range between G_PRIORITY_DEFAULT_IDLE and G_PRIORITY_HIGH_IDLE.


Type: GPid

Process to watch. On POSIX the positive pid of a child process. On Windows a handle for a process (which doesn’t have to be a child).


Type: GChildWatchFunc

Function to call.


Type: gpointer

Data to pass to function.

The argument can be NULL.
The data is owned by the caller of the function.

Type: GDestroyNotify

Function to call when the idle is removed, or NULL.

The argument can be NULL.

Return value

Type: guint

The ID (greater than 0) of the event source.