X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fstart.c;h=82122cc63a464b09642ba6faa7cc1e2a9c3c6042;hp=8292787731e4bc36360588d5df3ba4b3ab0a52d4;hb=f73fabfda365d22e7dd180fb1614e37c446fbd9e;hpb=c399183f4b3257c43915f3d81f44befd23165ad9

diff --git a/src/bin/lttng/commands/start.c b/src/bin/lttng/commands/start.c
index 829278773..82122cc63 100644
--- a/src/bin/lttng/commands/start.c
+++ b/src/bin/lttng/commands/start.c
@@ -1,19 +1,18 @@
 /*
  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; only version 2
- * of the License.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _GNU_SOURCE
@@ -27,15 +26,19 @@
 
 #include "../command.h"
 
+#include <common/sessiond-comm/sessiond-comm.h>
+
 static char *opt_session_name;
 
 enum {
 	OPT_HELP = 1,
+	OPT_LIST_OPTIONS,
 };
 
 static struct poptOption long_options[] = {
 	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
 	{"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
+	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
 	{0, 0, 0, 0, 0, 0, 0}
 };
 
@@ -44,12 +47,14 @@ static struct poptOption long_options[] = {
  */
 static void usage(FILE *ofp)
 {
-	fprintf(ofp, "usage: lttng start [options] [NAME]\n");
+	fprintf(ofp, "usage: lttng start [NAME] [OPTIONS]\n");
 	fprintf(ofp, "\n");
 	fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
 	fprintf(ofp, "get it from the configuration directory (.lttng).\n");
 	fprintf(ofp, "\n");
+	fprintf(ofp, "Options:\n");
 	fprintf(ofp, "  -h, --help               Show this help\n");
+	fprintf(ofp, "      --list-options       Simple listing of options\n");
 	fprintf(ofp, "\n");
 }
 
@@ -60,7 +65,7 @@ static void usage(FILE *ofp)
  */
 static int start_tracing(void)
 {
-	int ret = CMD_SUCCESS;
+	int ret;
 	char *session_name;
 
 	if (opt_session_name == NULL) {
@@ -77,9 +82,19 @@ static int start_tracing(void)
 
 	ret = lttng_start_tracing(session_name);
 	if (ret < 0) {
+		switch (-ret) {
+		case LTTNG_ERR_TRACE_ALREADY_STARTED:
+			WARN("Tracing already started for session %s", session_name);
+			break;
+		default:
+			ERR("%s", lttng_strerror(ret));
+			break;
+		}
 		goto free_name;
 	}
 
+	ret = CMD_SUCCESS;
+
 	MSG("Tracing started for session %s", session_name);
 
 free_name:
@@ -97,7 +112,7 @@ error:
  */
 int cmd_start(int argc, const char **argv)
 {
-	int opt, ret;
+	int opt, ret = CMD_SUCCESS;
 	static poptContext pc;
 
 	pc = poptGetContext(NULL, argc, argv, long_options, 0);
@@ -106,8 +121,10 @@ int cmd_start(int argc, const char **argv)
 	while ((opt = poptGetNextOpt(pc)) != -1) {
 		switch (opt) {
 		case OPT_HELP:
-			usage(stderr);
-			ret = CMD_SUCCESS;
+			usage(stdout);
+			goto end;
+		case OPT_LIST_OPTIONS:
+			list_cmd_options(stdout, long_options);
 			goto end;
 		default:
 			usage(stderr);
@@ -121,5 +138,6 @@ int cmd_start(int argc, const char **argv)
 	ret = start_tracing();
 
 end:
+	poptFreeContext(pc);
 	return ret;
 }