commit 2bf5332f233b1f718f297c0424bf441fa44d720d
author Elliott Hughes <enh@google.com> Mon Mar 07 11:54:02 2016 -0800
committer Elliott Hughes <enh@google.com> Mon Mar 07 11:54:02 2016 -0800
tree 4ba7925da978da28691a2dd05e77b6220384e5d1
parent ba2232d0132274433a269eeccbbbd3be7f8f4384

Minor clock_getcpuclockid optimization.

Don't ask the kernel to copy data to userspace if we don't need it.
(Noticed while cleaning up sysconf to not call clock_getres.)

Change-Id: Icc0f7559775b8a2dcefe638ce831d06b75d67122

libc/bionic/clock_getcpuclockid.cpp

diff --git a/libc/bionic/clock_getcpuclockid.cpp b/libc/bionic/clock_getcpuclockid.cpp
index 5511eb4..9ff1845 100644
--- a/libc/bionic/clock_getcpuclockid.cpp
+++ b/libc/bionic/clock_getcpuclockid.cpp
@@ -40,8 +40,7 @@
   result |= 2;
   // Bit 2: thread (set) or process (clear). Bit 2 already 0.
 
-  timespec ts;
-  if (clock_getres(result, &ts) == -1) {
+  if (clock_getres(result, nullptr) == -1) {
     return ESRCH;
   }