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[Qemu-devel] [PATCH v2] trace: Flush trace buffer on exit
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v2] trace: Flush trace buffer on exit |
Date: |
Fri, 9 Jul 2010 12:23:33 +0100 |
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
This patch is against the tracing branch:
http://repo.or.cz/w/qemu/stefanha.git/shortlog/refs/heads/tracing
v2:
* Reset trace_idx in flush_trace_buffer().
simpletrace.c | 27 ++++++++++++++++++---------
1 files changed, 18 insertions(+), 9 deletions(-)
diff --git a/simpletrace.c b/simpletrace.c
index ace009f..4a4203e 100644
--- a/simpletrace.c
+++ b/simpletrace.c
@@ -22,6 +22,23 @@ static TraceRecord trace_buf[TRACE_BUF_LEN];
static unsigned int trace_idx;
static FILE *trace_fp;
+static void flush_trace_buffer(void)
+{
+ if (!trace_fp) {
+ trace_fp = fopen("/tmp/trace.log", "w");
+ if (trace_fp) {
+ atexit(flush_trace_buffer);
+ }
+ }
+ if (trace_fp) {
+ size_t unused; /* for when fwrite(3) is declared warn_unused_result */
+ unused = fwrite(trace_buf, trace_idx * sizeof(trace_buf[0]), 1,
trace_fp);
+ }
+
+ /* Discard written trace records */
+ trace_idx = 0;
+}
+
static void trace(TraceEventID event, unsigned long x1,
unsigned long x2, unsigned long x3,
unsigned long x4, unsigned long x5)
@@ -44,15 +61,7 @@ static void trace(TraceEventID event, unsigned long x1,
rec->x5 = x5;
if (++trace_idx == TRACE_BUF_LEN) {
- trace_idx = 0;
-
- if (!trace_fp) {
- trace_fp = fopen("/tmp/trace.log", "w");
- }
- if (trace_fp) {
- size_t result = fwrite(trace_buf, sizeof trace_buf, 1, trace_fp);
- result = result;
- }
+ flush_trace_buffer();
}
}
--
1.7.1
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