test_rewrite_latency: check return value

Fixes warning

warning: test/test_rewrite_latency.cc:27:36: ignoring return value of ‘ssize_t pwrite(int, const void*, size_t, __off64_t)’, declared with attribute warn_unused_result [-Wunused-result]

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/src/test/test_rewrite_latency.cc b/src/test/test_rewrite_latency.cc
index 5b006f9cde56dd6110dd3fe9df5078ca0357b67d..67e7c675a297739d6735041f04fa34374d788e97 100644 (file)
--- a/src/test/test_rewrite_latency.cc
+++ b/src/test/test_rewrite_latency.cc
@@ -24,7 +24,8 @@ int main(int argc, const char **argv)
 
   while (true) {
     utime_t now = ceph_clock_now(NULL);
-    ::pwrite(fd, fn, strlen(fn), 0);
+    int r = ::pwrite(fd, fn, strlen(fn), 0);
+    assert(r >= 0);
     utime_t lat = ceph_clock_now(NULL);
     lat -= now;
     utime_t oldmin;