the priority of the idle source. Typically this will be in the range between G_PRIORITY_DEFAULT_IDLE and G_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
data to pass to function
function to call when the idle is removed, or NULL
the ID (greater than 0) of the event source.
2.4
Sets a function to be called when the child indicated by pid exits, at the priority priority.
If you obtain pid from Spawn.async or Spawn.asyncWithPipes 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 Spawn.checkExitStatus in the callback to determine whether or not the child exited successfully.
Also, note that on platforms where GPid must be explicitly closed (see Spawn.closePid) pid must not be closed while the source is still active. Typically, you should invoke Spawn.closePid 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 Source.attach. You can do these steps manually if you need greater control.