watch_child

Watches child_pid.

When the process exists, the child_exited signal will be called with the child's exit status.

Prior to calling this function, a Pty must have been set in this using set_pty. When the child exits, the terminal's Pty will be set to null.

Note: g_child_watch_add or add_full must not have been called for child_pid, nor a SocketSource for it been created with ChildWatchSource.

Note: when using the spawn_async family of functions, the DO_NOT_REAP_CHILD flag MUST have been passed.

Parameters:

this	a Terminal
child_pid	a Pid