ChildWatchFunc
Prototype of a #GChildWatchSource callback, called when a child process has exited.
To interpret @wait_status, see the documentation for g_spawn_check_wait_status(). In particular, on Unix platforms, note that it is usually not equal to the integer passed to exit() or returned from main().
param
pidthe process id of the child processparam
waitStatusStatus information about the child process, encoded in a platform-specific manner