childWatchAdd
Sets a function to be called when the child indicated by @pid exits, at the priority @priority.
If you obtain @pid from func@GLib.spawn_async or func@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 func@GLib.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 func@GLib.spawn_close_pid) @pid must not be closed while the source is still active. Typically, you should invoke func@GLib.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 func@GLib.child_watch_source_new apply to this function.
This internally creates a main loop source using func@GLib.child_watch_source_new and attaches it to the main loop context using method@GLib.Source.attach. You can do these steps manually if you need greater control.
Return
the ID (greater than 0) of the event source.
Since
2.4
Parameters
the priority of the idle source. Typically this will be in the range between const@GLib.PRIORITY_DEFAULT_IDLE and const@GLib.PRIORITY_HIGH_IDLE.
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).
function to call