X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Flttng.c;h=64f3efa446530ed61663c9434eb77251cc923c91;hp=2ee93253fe7b50f7ddfc139c58bde769465ec09c;hb=679b4943c3b0f451e7f4fbcd804dd8a7a679e253;hpb=db7586006bc1a2b9057a2c108bf1e7d20fd6903f

diff --git a/src/bin/lttng/lttng.c b/src/bin/lttng/lttng.c
index 2ee93253f..64f3efa44 100644
--- a/src/bin/lttng/lttng.c
+++ b/src/bin/lttng/lttng.c
@@ -22,6 +22,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 #include <unistd.h>
 #include <config.h>
 
@@ -37,6 +39,7 @@ int opt_quiet;
 int opt_verbose;
 static int opt_no_sessiond;
 static char *opt_sessiond_path;
+static pid_t sessiond_pid;
 
 enum {
 	OPT_SESSION_PATH,
@@ -168,14 +171,23 @@ static void clean_exit(int code)
  */
 static void sighandler(int sig)
 {
+	int status;
+
 	switch (sig) {
 		case SIGTERM:
 			DBG("SIGTERM caugth");
 			clean_exit(EXIT_FAILURE);
 			break;
 		case SIGCHLD:
-			/* Notify is done */
 			DBG("SIGCHLD caugth");
+			waitpid(sessiond_pid, &status, 0);
+			/* Indicate that the session daemon died */
+			sessiond_pid = 0;
+			ERR("Session daemon died (exit status %d)", WEXITSTATUS(status));
+			break;
+		case SIGUSR1:
+			/* Notify is done */
+			DBG("SIGUSR1 caugth");
 			break;
 		default:
 			DBG("Unknown signal %d caugth", sig);
@@ -204,7 +216,7 @@ static int set_signal_handler(void)
 	sa.sa_handler = sighandler;
 	sa.sa_mask = sigset;
 	sa.sa_flags = 0;
-	if ((ret = sigaction(SIGCHLD, &sa, NULL)) < 0) {
+	if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
 		perror("sigaction");
 		goto end;
 	}
@@ -214,6 +226,11 @@ static int set_signal_handler(void)
 		goto end;
 	}
 
+	if ((ret = sigaction(SIGCHLD, &sa, NULL)) < 0) {
+		perror("sigaction");
+		goto end;
+	}
+
 end:
 	return ret;
 }
@@ -246,9 +263,6 @@ static int handle_command(int argc, char **argv)
 			case CMD_ERROR:
 				ERR("Command error");
 				break;
-			case CMD_NOT_IMPLEMENTED:
-				ERR("Options not implemented");
-				break;
 			case CMD_UNDEFINED:
 				ERR("Undefined command");
 				break;
@@ -296,8 +310,12 @@ static int spawn_sessiond(char *pathname)
 		kill(getppid(), SIGTERM);	/* unpause parent */
 		exit(EXIT_FAILURE);
 	} else if (pid > 0) {
+		sessiond_pid = pid;
 		/* Wait for lttng-sessiond to start */
 		pause();
+		if (!sessiond_pid) {
+			exit(EXIT_FAILURE);
+		}
 		goto end;
 	} else {
 		perror("fork");
@@ -359,15 +377,19 @@ end:
 }
 
 /*
- * Check for the "help" option in the argv. If found, return 1 else return 0.
+ * Check args for specific options that *must* not trigger a session daemon
+ * execution.
+ *
+ * Return 1 if match else 0.
  */
-static int check_help_command(int argc, char **argv)
+static int check_args_no_sessiond(int argc, char **argv)
 {
 	int i;
 
 	for (i = 0; i < argc; i++) {
 		if ((strncmp(argv[i], "-h", 2) == 0) ||
-				strncmp(argv[i], "--h", 3) == 0) {
+				strncmp(argv[i], "--h", 3) == 0 ||
+				strncmp(argv[i], "--list-options", 14)) {
 			return 1;
 		}
 	}
@@ -430,7 +452,7 @@ static int parse_args(int argc, char **argv)
 	}
 
 	/* Spawn session daemon if needed */
-	if (opt_no_sessiond == 0 && check_help_command(argc, argv) == 0 &&
+	if (opt_no_sessiond == 0 && check_args_no_sessiond(argc, argv) == 0 &&
 			(check_sessiond() < 0)) {
 		goto error;
 	}