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);
/*
* start_client
}
if (opt_session_uuid != NULL) {
+ DBG("Set session uuid to %s", opt_session_uuid);
lttng_set_current_session_uuid(opt_session_uuid);
}
if (ret < 0) {
goto end;
}
- MSG("Trace created successfully!\nUse --start PID to start tracing");
+ 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!");
}
return 0;
{
int i, ret, count;
pid_t *pids;
- FILE *fp;
- char path[24]; /* Can't go bigger than /proc/65535/cmdline */
- char cmdline[PATH_MAX];
+ char *cmdline;
count = lttng_ust_list_apps(&pids);
if (count < 0) {
MSG("LTTng UST traceable application [name (pid)]:");
for (i=0; i < count; i++) {
- snprintf(path, sizeof(path), "/proc/%d/cmdline", pids[i]);
- fp = fopen(path, "r");
- if (fp == NULL) {
+ ret = get_cmdline_by_pid(pids[i], &cmdline);
+ if (!ret) {
MSG("\t(not running) (%d)", pids[i]);
continue;
}
- ret = fread(cmdline, 1, sizeof(cmdline), fp);
MSG("\t%s (%d)", cmdline, pids[i]);
- fclose(fp);
+ free(cmdline);
}
/* Allocated by lttng_ust_list_apps() */
return ret;
}
+/*
+ * get_cmdline_by_pid
+ *
+ * Get command line from /proc for a
+ * specific pid. Allocate cmdline so the
+ * user must free() that pointer.
+ *
+ * On success, return 1
+ * On error (not found), return 0
+ */
+static int get_cmdline_by_pid(pid_t pid, char **cmdline)
+{
+ int ret;
+ FILE *fp;
+ 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;
+ }
+
+ /* Caller must free() *cmdline */
+ *cmdline = malloc(PATH_MAX);
+ ret = fread(*cmdline, 1, PATH_MAX, fp);
+ fclose(fp);
+
+ return 1;
+
+not_running:
+ return 0;
+}
+
+/*
+ * validate_options
+ *
+ * Make sure that all options passed to the command line
+ * are compatible with each others.
+ *
+ * On error, return -1
+ * On success, return 0
+ */
+static int validate_options(void)
+{
+ if ((opt_session_uuid == NULL) &&
+ (opt_create_trace || opt_start_trace)) {
+ ERR("Can't act on trace without a session ID.\nPlease specify using --session UUID");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return -1;
+}
+
/*
* spawn_sessiond
*
*/
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;
}
clean_exit(EXIT_FAILURE);
}
+ ret = validate_options();
+ if (ret < 0) {
+ return EXIT_FAILURE;
+ }
+
ret = set_signal_handler();
if (ret < 0) {
clean_exit(ret);