X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fmain.c;h=a8751c696a62c58a5b634d2671be6971369dacde;hb=c9cb3e7db56f4325ed97c068f8ced2c2c0366495;hp=cef1040563b1f84ae2af85235c80752aa4cabfe9;hpb=8bf28e6702eaffc5a3314ba0f7d10c76e59cd289;p=lttng-tools.git

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index cef104056..a8751c696 100644
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -85,6 +85,7 @@ static char *opt_load_session_path;
 static pid_t ppid;          /* Parent PID for --sig-parent option */
 static pid_t child_ppid;    /* Internal parent PID use with daemonize. */
 static char *rundir;
+static int lockfile_fd = -1;
 
 /* Set to 1 when a SIGUSR1 signal is received. */
 static int recv_child_signal;
@@ -511,6 +512,27 @@ static void close_consumer_sockets(void)
 	}
 }
 
+/*
+ * Generate the full lock file path using the rundir.
+ *
+ * Return the snprintf() return value thus a negative value is an error.
+ */
+static int generate_lock_file_path(char *path, size_t len)
+{
+	int ret;
+
+	assert(path);
+	assert(rundir);
+
+	/* Build lockfile path from rundir. */
+	ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir);
+	if (ret < 0) {
+		PERROR("snprintf lockfile path");
+	}
+
+	return ret;
+}
+
 /*
  * Cleanup the daemon
  */
@@ -592,14 +614,6 @@ static void cleanup(void)
 	DBG("Removing directory %s", path);
 	(void) rmdir(path);
 
-	/*
-	 * We do NOT rmdir rundir because there are other processes
-	 * using it, for instance lttng-relayd, which can start in
-	 * parallel with this teardown.
-	 */
-
-	free(rundir);
-
 	DBG("Cleaning up all sessions");
 
 	/* Destroy session list mutex */
@@ -664,6 +678,34 @@ static void cleanup(void)
 		free(load_info);
 	}
 
+	/*
+	 * Cleanup lock file by deleting it and finaly closing it which will
+	 * release the file system lock.
+	 */
+	if (lockfile_fd >= 0) {
+		char lockfile_path[PATH_MAX];
+
+		ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
+		if (ret > 0) {
+			ret = remove(lockfile_path);
+			if (ret < 0) {
+				PERROR("remove lock file");
+			}
+			ret = close(lockfile_fd);
+			if (ret < 0) {
+				PERROR("close lock file");
+			}
+		}
+	}
+
+	/*
+	 * We do NOT rmdir rundir because there are other processes
+	 * using it, for instance lttng-relayd, which can start in
+	 * parallel with this teardown.
+	 */
+
+	free(rundir);
+
 	/* <fun> */
 	DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
 			"Matthew, BEET driven development works!%c[%dm",
@@ -4854,6 +4896,24 @@ error:
 	return;
 }
 
+/*
+ * Create lockfile using the rundir and return its fd.
+ */
+static int create_lockfile(void)
+{
+	int ret;
+	char lockfile_path[PATH_MAX];
+
+	ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
+	if (ret < 0) {
+		goto error;
+	}
+
+	ret = utils_create_lock_file(lockfile_path);
+error:
+	return ret;
+}
+
 /*
  * Write JUL TCP port using the rundir.
  */
@@ -5059,6 +5119,11 @@ int main(int argc, char **argv)
 		}
 	}
 
+	lockfile_fd = create_lockfile();
+	if (lockfile_fd < 0) {
+		goto error;
+	}
+
 	/* Set consumer initial state */
 	kernel_consumerd_state = CONSUMER_STOPPED;
 	ust_consumerd_state = CONSUMER_STOPPED;