Tickle glib by waiting for Emacs itself, not for process 0.

* process.c (init_process_emacs) [HAVE_GLIB && !WINDOWSNT]:
Wait for self, not for 0.  This can't hurt on GNU or similar
system, and may help with Cygwin.

Fixes: debbugs:14569

src/ChangeLog

 2013-06-11  Paul Eggert  <eggert@cs.ucla.edu>
+	Tickle glib by waiting for Emacs itself, not for process 0 (Bug#14569).
+	* process.c (init_process_emacs) [HAVE_GLIB && !WINDOWSNT]:
+	Wait for self, not for 0.  This can't hurt on GNU or similar
+	system, and may help with Cygwin.
+
 	* keyboard.c: Don't use PROP (...) as an lvalue.
 	(parse_tool_bar_item) [!USE_GTK && !HAVE_NS]:
 	Use set_prop (A, B), not PROP (A) = B.

src/process.c

@@ -7068,9 +7068,10 @@ init_process_emacs (void)
 #endif
     {
 #if defined HAVE_GLIB && !defined WINDOWSNT
-      /* Tickle glib's child-handling code so that it initializes its
+      /* Tickle glib's child-handling code.  Ask glib to wait for Emacs itself;
+	 this should always fail, but is enough to initialize glib's
 	 private SIGCHLD handler.  */
-      g_source_unref (g_child_watch_source_new (0));
+      g_source_unref (g_child_watch_source_new (getpid ()));
 #endif
       catch_child_signal ();
     }