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-rw-r--r--tools/perf/util/util.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 214265674ddd..5b3ea49aa63e 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -114,3 +114,20 @@ unsigned long convert_unit(unsigned long value, char *unit)
return value;
}
+
+int readn(int fd, void *buf, size_t n)
+{
+ void *buf_start = buf;
+
+ while (n) {
+ int ret = read(fd, buf, n);
+
+ if (ret <= 0)
+ return ret;
+
+ n -= ret;
+ buf += ret;
+ }
+
+ return buf - buf_start;
+}