[PATCH 4/5] rtla/timerlat_hist: Abort event processing on second signal

[Tomas Glozar <tglozar@redhat.com>]

If either SIGINT is received twice, or after a SIGALRM (that is, after
timerlat was supposed to stop), abort processing events currently left
in the tracefs buffer and exit immediately.

This allows the user to exit rtla without waiting for processing all
events, should that take longer than wanted, at the cost of not
processing all samples.

Signed-off-by: Tomas Glozar <tglozar@redhat.com>
---
 tools/tracing/rtla/src/timerlat_hist.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index e8d249e22251..d0a4d20b7196 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -1149,6 +1149,14 @@ static int stop_tracing;
 static struct trace_instance *hist_inst = NULL;
 static void stop_hist(int sig)
 {
+	if (stop_tracing) {
+		/*
+		 * Stop requested twice in a row; abort event processing and
+		 * exit immediately
+		 */
+		tracefs_iterate_stop(hist_inst->inst);
+		return;
+	}
 	stop_tracing = 1;
 	if (hist_inst)
 		trace_instance_stop(hist_inst);
-- 
2.47.1