[PATCH] trace-cmd: Do not block on reads when record is finished

[Steven Rostedt (Red Hat)]

Starting with Linux v3.10, trace_pipe_raw will block on reads.
We need to make sure that when the trace is done, the reads do
not block, and flushing finishes reading the ring buffer.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 trace-recorder.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/trace-recorder.c b/trace-recorder.c
index 1b9723d..4e15b86 100644
--- a/trace-recorder.c
+++ b/trace-recorder.c
@@ -249,9 +249,15 @@ int tracecmd_start_recording(struct tracecmd_recorder *recorder, unsigned long s
 
 void tracecmd_stop_recording(struct tracecmd_recorder *recorder)
 {
+	long flags;
+
 	if (!recorder)
 		return;
 
+	/* Do not block on reads for flushing */
+	flags = fcntl(recorder->trace_fd, F_GETFL);
+	fcntl(recorder->trace_fd, F_SETFL, flags | O_NONBLOCK);
+
 	recorder->stop = 1;
 }
 
-- 
1.7.10.4



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