X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=lttng%2Flttng.c;h=8a0d58faeaa8ac7ec7299a7a633d9ada73e8e513;hp=9751621ff84f2c4fceb2267c5dd1b1ec6f83e1ae;hb=520ff6876d5fdf7e5421733a8f2a7d0c20e43c8c;hpb=8548ff30b847b76f7f62770ad5512883ee1e775a

diff --git a/lttng/lttng.c b/lttng/lttng.c
index 9751621ff..8a0d58fae 100644
--- a/lttng/lttng.c
+++ b/lttng/lttng.c
@@ -42,11 +42,12 @@ static char *progname;
 static int process_client_opt(void);
 static int process_opt_list_apps(void);
 static int process_opt_list_sessions(void);
+static int process_opt_list_traces(void);
 static int process_opt_create_session(void);
 static void sighandler(int sig);
 static int set_signal_handler(void);
-static int get_cmdline_by_pid(pid_t pid, char **cmdline);
 static int validate_options(void);
+static char *get_cmdline_by_pid(pid_t pid);
 
 /*
  *  start_client
@@ -80,6 +81,13 @@ static int process_client_opt(void)
 		}
 	}
 
+	if (opt_list_traces) {
+		ret = process_opt_list_traces();
+		if (ret < 0) {
+			goto end;
+		}
+	}
+
 	if (opt_create_session != NULL) {
 		ret = process_opt_create_session();
 		if (ret < 0) {
@@ -96,6 +104,7 @@ static int process_client_opt(void)
 	}
 
 	if (opt_session_uuid != NULL) {
+		DBG("Set session uuid to %s", opt_session_uuid);
 		lttng_set_current_session_uuid(opt_session_uuid);
 	}
 
@@ -108,6 +117,24 @@ static int process_client_opt(void)
 		MSG("Trace created successfully!\nUse --start PID to start tracing.");
 	}
 
+	if (opt_start_trace) {
+		DBG("Start trace for pid %d", opt_start_trace);
+		ret = lttng_ust_start_trace(opt_start_trace);
+		if (ret < 0) {
+			goto end;
+		}
+		MSG("Trace started successfully!");
+	}
+
+	if (opt_stop_trace) {
+		DBG("Stop trace for pid %d", opt_stop_trace);
+		ret = lttng_ust_stop_trace(opt_stop_trace);
+		if (ret < 0) {
+			goto end;
+		}
+		MSG("Trace stopped successfully!");
+	}
+
 	return 0;
 
 end:
@@ -115,6 +142,47 @@ end:
 	return ret;
 }
 
+/*
+ *  process_opt_list_traces
+ *
+ *  Get list of all traces for a specific session uuid.
+ */
+static int process_opt_list_traces(void)
+{
+	int ret, i;
+	uuid_t uuid;
+	struct lttng_trace *traces;
+
+	uuid_parse(opt_session_uuid, uuid);
+	ret = lttng_list_traces(&uuid, &traces);
+	if (ret < 0) {
+		goto error;
+	}
+
+	MSG("Userspace traces:");
+	for (i = 0; i < ret; i++) {
+		if (traces[i].type == USERSPACE) {
+			MSG("\t%d) %s (pid: %d): %s",
+					i, traces[i].name, traces[i].pid,
+					get_cmdline_by_pid(traces[i].pid));
+		} else {
+			break;
+		}
+	}
+
+	MSG("Kernel traces:");
+	for (;i < ret; i++) {
+		if (traces[i].type == KERNEL) {
+			MSG("\t%d) %s", i, traces[i].name);
+		}
+	}
+
+	free(traces);
+
+error:
+	return ret;
+}
+
 /*
  *  process_opt_create_session
  *
@@ -192,8 +260,8 @@ static int process_opt_list_apps(void)
 
 	MSG("LTTng UST traceable application [name (pid)]:");
 	for (i=0; i < count; i++) {
-		ret = get_cmdline_by_pid(pids[i], &cmdline);
-		if (!ret) {
+		cmdline = get_cmdline_by_pid(pids[i]);
+		if (cmdline == NULL) {
 			MSG("\t(not running) (%d)", pids[i]);
 			continue;
 		}
@@ -213,34 +281,32 @@ error:
 /*
  *  get_cmdline_by_pid
  *
- *  Get command line from /proc for a
- *  specific pid. Allocate cmdline so the
- *  user must free() that pointer.
+ *  Get command line from /proc for a specific pid.
  *
- *  On success, return 1
- *  On error (not found), return 0
+ *  On success, return an allocated string pointer pointing to
+ *  the proc cmdline.
+ *  On error, return NULL.
  */
-static int get_cmdline_by_pid(pid_t pid, char **cmdline)
+static char *get_cmdline_by_pid(pid_t pid)
 {
 	int ret;
 	FILE *fp;
+	char *cmdline = NULL;
 	char path[24];	/* Can't go bigger than /proc/65535/cmdline */
 
 	snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
 	fp = fopen(path, "r");
 	if (fp == NULL) {
-		goto not_running;
+		goto end;
 	}
 
 	/* Caller must free() *cmdline */
-	*cmdline = malloc(PATH_MAX);
-	ret = fread(*cmdline, 1, PATH_MAX, fp);
+	cmdline = malloc(PATH_MAX);
+	ret = fread(cmdline, 1, PATH_MAX, fp);
 	fclose(fp);
 
-	return 1;
-
-not_running:
-	return 0;
+end:
+	return cmdline;
 }
 
 /*
@@ -255,8 +321,8 @@ not_running:
 static int validate_options(void)
 {
 	if ((opt_session_uuid == NULL) &&
-			(opt_create_trace)) {
-		ERR("Can't create trace without a session ID.\nPlease specify using --session UUID");
+			(opt_create_trace || opt_start_trace || opt_list_traces)) {
+		ERR("You need to specify a session UUID.\nPlease use --session UUID to do so.");
 		goto error;
 	}
 
@@ -400,15 +466,17 @@ end:
  */
 static void sighandler(int sig)
 {
-	DBG("%d received", sig);
 	switch (sig) {
 		case SIGTERM:
+			DBG("SIGTERM catched");
 			clean_exit(EXIT_FAILURE);
 			break;
 		case SIGCHLD:
 			/* Notify is done */
+			DBG("SIGCHLD catched");
 			break;
 		default:
+			DBG("Unknown signal %d catched", sig);
 			break;
 	}