+ * Check if the session daemon is available using
+ * the liblttngctl API for the check. If not, try to
+ * spawn a daemon.
+ */
+static int launch_sessiond(void)
+{
+ int ret;
+ char *pathname = NULL;
+
+ ret = lttng_session_daemon_alive();
+ if (ret) {
+ /* Sessiond is alive, not an error */
+ ret = 0;
+ goto end;
+ }
+
+ /* Try command line option path */
+ pathname = opt_sessiond_path;
+
+ /* Try LTTNG_SESSIOND_PATH env variable */
+ if (pathname == NULL) {
+ pathname = getenv(DEFAULT_SESSIOND_PATH_ENV);
+ }
+
+ /* Try with configured path */
+ if (pathname == NULL) {
+ if (CONFIG_SESSIOND_BIN[0] != '\0') {
+ pathname = CONFIG_SESSIOND_BIN;
+ }
+ }
+
+ /* Try the default path */
+ if (pathname == NULL) {
+ pathname = INSTALL_BIN_PATH "/lttng-sessiond";
+ }
+
+ DBG("Session daemon binary path: %s", pathname);
+
+ /* Check existence and permissions */
+ ret = access(pathname, F_OK | X_OK);
+ if (ret < 0) {
+ ERR("No such file or access denied: %s", pathname);
+ goto end;
+ }
+
+ ret = spawn_sessiond(pathname);
+end:
+ if (ret) {
+ ERR("Problem occurred while launching session daemon (%s)",
+ pathname);
+ }
+ return ret;
+}
+
+int validate_url_option_combination(void)
+{
+ int ret = 0;
+ int used_count = 0;
+
+ used_count += !!opt_url;
+ used_count += !!opt_output_path;
+ used_count += (opt_data_url || opt_ctrl_url);
+ if (used_count > 1) {
+ ERR("Only one of the --set-url, --ctrl-url/data-url, or --output options may be used at once.");
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/*
+ * The 'create <options>' first level command
+ *
+ * Returns one of the CMD_* result constants.