[dm-devel] [PATCH v3 17/29] multipathd: add cleanup_child() exit handler

[mwilck at suse.com]

From: Martin Wilck <mwilck at suse.com>

cleanup_child() calls all cleanups in the right order, in an
exit handler.

Reviewed-by: Benjamin Marzinski <bmarzins at redhat.com>
Signed-off-by: Martin Wilck <mwilck at suse.com>
---
 multipathd/main.c | 45 +++++++++++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/multipathd/main.c b/multipathd/main.c
index 4c4e2ea..50cc335 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -3024,6 +3024,27 @@ static void cleanup_rcu(void)
 	rcu_unregister_thread();
 }
 
+static void cleanup_child(void)
+{
+	cleanup_threads();
+	cleanup_vecs();
+	cleanup_foreign();
+	cleanup_checkers();
+	cleanup_prio();
+	if (poll_dmevents)
+		cleanup_dmevent_waiter();
+
+	cleanup_pidfile();
+	if (logsink == 1)
+		log_thread_stop();
+
+	cleanup_conf();
+
+#ifdef _DEBUG_
+	dbg_free_final(NULL);
+#endif
+}
+
 static int sd_notify_exit(int err)
 {
 #ifdef USE_SYSTEMD
@@ -3049,7 +3070,9 @@ child (__attribute__((unused)) void *param)
 	mlockall(MCL_CURRENT | MCL_FUTURE);
 	signal_init();
 	mp_rcu_data = setup_rcu();
-	atexit(cleanup_rcu);
+
+	if (atexit(cleanup_rcu) || atexit(cleanup_child))
+		fprintf(stderr, "failed to register cleanup handlers\n");
 
 	setup_thread_attr(&misc_attr, 64 * 1024, 0);
 	setup_thread_attr(&uevent_attr, DEFAULT_UEVENT_STACKSIZE * 1024, 0);
@@ -3063,8 +3086,6 @@ child (__attribute__((unused)) void *param)
 	pid_fd = pidfile_create(DEFAULT_PIDFILE, daemon_pid);
 	if (pid_fd < 0) {
 		condlog(1, "failed to create pidfile");
-		if (logsink == 1)
-			log_thread_stop();
 		exit(1);
 	}
 
@@ -3212,24 +3233,8 @@ child (__attribute__((unused)) void *param)
 
 	exit_code = 0;
 failed:
-	cleanup_threads();
-	cleanup_vecs();
-	cleanup_foreign();
-	cleanup_checkers();
-	cleanup_prio();
-	if (poll_dmevents)
-		cleanup_dmevent_waiter();
-
-	/* We're done here */
-	cleanup_pidfile();
 	condlog(2, "--------shut down-------");
-
-	if (logsink == 1)
-		log_thread_stop();
-	cleanup_conf();
-#ifdef _DEBUG_
-	dbg_free_final(NULL);
-#endif
+	/* All cleanup is done in the cleanup_child() exit handler */
 	return sd_notify_exit(exit_code);
 }
 
-- 
2.29.0