From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
Like tracefs_cpu_flush(), when the buffer is empty, and because the
reading of the buffer is done in NON_BLOCK mode, it will finish with a
negative and EAGAIN. This is a successful state, do not return a negative
number here.
Fixes: 26b8893efda7c ("libtracefs: Add reading of per cpu files")
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
src/tracefs-record.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/tracefs-record.c b/src/tracefs-record.c
index dbe0e9f01aad..71d1df99bb02 100644
--- a/src/tracefs-record.c
+++ b/src/tracefs-record.c
@@ -495,6 +495,10 @@ int tracefs_cpu_flush_write(struct tracefs_cpu *tcpu, int wfd)
if (ret > 0)
ret = write(wfd, buffer, ret);
+ /* It's OK if there's no data to read */
+ if (ret < 0 && errno == EAGAIN)
+ ret = 0;
+
return ret;
}
--
2.35.1
|