From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Wed, 27 Nov 2019 18:20:32 +0000 (-0500)
Subject: relayd: clean-up: reduce the number of exit paths in main()
X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=commitdiff_plain;h=794e2e5f064718252b249e17914c9b2b089d8d0c

relayd: clean-up: reduce the number of exit paths in main()

The relay daemons's initialization and teardown relies on a large
number of goto/labels to clean-up on failure to launch.

All of the clean-up can be performed unconditionally by checking for
NULL or uninitialized file descriptors in relayd_cleanup(). This
reduces the number of possible tear-down paths and partly initialized
state to keep track of.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I3195caf05b3dd04cc7e9c60dcb322261159fe0df
---

diff --git a/src/bin/lttng-relayd/health-relayd.c b/src/bin/lttng-relayd/health-relayd.c
index 482be8eea..8b2febe05 100644
--- a/src/bin/lttng-relayd/health-relayd.c
+++ b/src/bin/lttng-relayd/health-relayd.c
@@ -55,7 +55,7 @@
 static
 char health_unix_sock_path[PATH_MAX];
 
-int health_quit_pipe[2];
+int health_quit_pipe[2] = { -1, -1 };
 
 /*
  * Check if the thread quit pipe was triggered.
diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index f61f1f13e..07e7a0122 100644
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -659,9 +659,18 @@ static void relayd_cleanup(void)
 	free(opt_output_path);
 	free(opt_working_directory);
 
+	if (health_relayd) {
+		health_app_destroy(health_relayd);
+	}
 	/* Close thread quit pipes */
+	utils_close_pipe(health_quit_pipe);
 	utils_close_pipe(thread_quit_pipe);
 
+	if (sessiond_trace_chunk_registry) {
+		sessiond_trace_chunk_registry_destroy(
+				sessiond_trace_chunk_registry);
+	}
+
 	uri_free(control_uri);
 	uri_free(data_uri);
 	/* Live URI is freed in the live thread. */
@@ -4059,7 +4068,7 @@ int main(int argc, char **argv)
 	if (!sessiond_trace_chunk_registry) {
 		ERR("Failed to initialize session daemon trace chunk registry");
 		retval = -1;
-		goto exit_sessiond_trace_chunk_registry;
+		goto exit_options;
 	}
 
 	/* Initialize thread health monitoring */
@@ -4067,19 +4076,19 @@ int main(int argc, char **argv)
 	if (!health_relayd) {
 		PERROR("health_app_create error");
 		retval = -1;
-		goto exit_health_app_create;
+		goto exit_options;
 	}
 
 	/* Create thread quit pipe */
 	if (init_thread_quit_pipe()) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* Setup the thread apps communication pipe. */
 	if (create_relay_conn_pipe()) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* Init relay command queue. */
@@ -4093,27 +4102,27 @@ int main(int argc, char **argv)
 	sessions_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
 	if (!sessions_ht) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* tables of streams indexed by stream ID */
 	relay_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
 	if (!relay_streams_ht) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* tables of streams indexed by stream ID */
 	viewer_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
 	if (!viewer_streams_ht) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	ret = utils_create_pipe(health_quit_pipe);
 	if (ret) {
 		retval = -1;
-		goto exit_health_quit_pipe;
+		goto exit_options;
 	}
 
 	/* Create thread to manage the client socket */
@@ -4123,7 +4132,7 @@ int main(int argc, char **argv)
 		errno = ret;
 		PERROR("pthread_create health");
 		retval = -1;
-		goto exit_health_thread;
+		goto exit_options;
 	}
 
 	/* Setup the dispatcher thread */
@@ -4204,16 +4213,6 @@ exit_dispatcher_thread:
 		PERROR("pthread_join health_thread");
 		retval = -1;
 	}
-exit_health_thread:
-
-	utils_close_pipe(health_quit_pipe);
-exit_health_quit_pipe:
-
-exit_init_data:
-	health_app_destroy(health_relayd);
-	sessiond_trace_chunk_registry_destroy(sessiond_trace_chunk_registry);
-exit_health_app_create:
-exit_sessiond_trace_chunk_registry:
 exit_options:
 	/*
 	 * Wait for all pending call_rcu work to complete before tearing