Simplify startup and teardown

The signal handler doesn't do anything except exit unsuccessfully,
which is the same thing that would happen if we were interrupted
by a signal. exit() is also not async-signal-safe, so calling it
in this context is undefined behaviour, although _exit() would
be OK.

The cleanup function also doesn't do anything, so don't register it.

The initialization function also doesn't do much, so inline it into
its only caller.

Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: André Magalhães <andre.magalhaes@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D5501

src/prestwood-main.c

@@ -14,42 +14,15 @@
 #include <stdlib.h>
 #include <glib.h>
 
-static void prestwood_cleanup (void)
-{
-}
-
-static void prestwood_exit (gint status)
-{
-	exit (status);
-}
-
-static void prestwood_handle_exit (void)
-{
-	struct sigaction action;
-	action.sa_handler = prestwood_exit;
-	action.sa_flags = 0;
-	sigaction (SIGINT, &action, NULL);
-	sigaction (SIGHUP, &action, NULL);
-	sigaction (SIGTERM, &action, NULL);
-	atexit (prestwood_cleanup);
-}
-
-static void prestwood_initialize (void)
-{
-	if (prestwood_init () != 0)
-		prestwood_exit (-1);
-}
-
-
 gint main (gint argc, gchar **argv)
 {
 
-	prestwood_handle_exit();
 	GMainLoop *mainloop = g_main_loop_new (NULL, TRUE);
 	if (mainloop == NULL)
 		return -1;
 
-	prestwood_initialize ();
+	if (prestwood_init () != 0)
+		return -1;
 
 	mainloop = g_main_loop_new (NULL, FALSE);
 	g_main_loop_run (mainloop);