compositor: Return a user-defined exit code

Currently, once we've reached our main's wl_display_run(), we always
return ret=EXIT_SUCCESS when weston terminates through wl_display_terminate.

This patch makes it possible to specify another return value by setting
prior to terminating Weston. This is useful for automated tests that want
to report test failures to the overlying testing infrastructure.

Signed-off-by: Frederic Plourde <frederic.plourde@collabora.co.uk>
[Pekka: fixed some tabs.]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

src/compositor.c

@@ -4151,6 +4151,14 @@ weston_compositor_shutdown(struct weston_compositor *ec)
 	weston_config_destroy(ec->config);
 }
 
+WL_EXPORT void
+weston_compositor_exit_with_code(struct weston_compositor *compositor,
+				 int exit_code)
+{
+	compositor->exit_code = exit_code;
+	wl_display_terminate(compositor->wl_display);
+}
+
 WL_EXPORT void
 weston_compositor_set_default_pointer_grab(struct weston_compositor *ec,
 			const struct weston_pointer_grab_interface *interface)
@@ -4764,6 +4772,7 @@ int main(int argc, char *argv[])
 
 	ec->idle_time = idle_time;
 	ec->default_pointer_grab = NULL;
+	ec->exit_code = EXIT_SUCCESS;
 
 	for (i = 1; i < argc; i++)
 		weston_log("fatal: unhandled option: %s\n", argv[i]);
@@ -4829,6 +4838,14 @@ int main(int argc, char *argv[])
 
 	wl_display_run(display);
 
+	/* Allow for setting return exit code after
+	 * wl_display_run returns normally. This is
+	 * useful for devs/testers and automated tests
+	 * that want to indicate failure status to
+	 * testing infrastructure above
+	 */
+	ret = ec->exit_code;
+
 out:
 	/* prevent further rendering while shutting down */
 	ec->state = WESTON_COMPOSITOR_OFFSCREEN;

src/compositor.h

@@ -664,6 +664,8 @@ struct weston_compositor {
 	int32_t kb_repeat_delay;
 
 	clockid_t presentation_clock;
+
+	int exit_code;
 };
 
 struct weston_buffer {
@@ -1264,6 +1266,9 @@ weston_compositor_set_presentation_clock_software(
 void
 weston_compositor_shutdown(struct weston_compositor *ec);
 void
+weston_compositor_exit_with_code(struct weston_compositor *compositor,
+				 int exit_code);
+void
 weston_output_init_zoom(struct weston_output *output);
 void
 weston_output_update_zoom(struct weston_output *output);