perf-counter: fix compiler warnings

Gcc complains about: lib/perf-counter.c:43:13: error: ignoring return value of 'read', declared with attribute warn_unused_result [-Werror=unused-result] read(fd__, counter, sizeof(*counter)); Signed-off-by: Andy Zhou <[email protected]> Acked-by: Russell Bryant <[email protected]>
Cartmanfku · Apr 14, 2015 · 296527d · 296527d
1 parent 60ceeb6
commit 296527d
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/lib/perf-counter.c b/lib/perf-counter.c
@@ -39,9 +39,9 @@ static int fd__ = 0;
 uint64_t
 perf_counter_read(uint64_t *counter)
 {
-    if (fd__ > 0) {
-        read(fd__, counter, sizeof(*counter));
-    } else {
+    size_t size = sizeof *counter;
+
+    if (fd__ <= 0 || read(fd__, counter, size) < size) {
         *counter = 0;
     }