commit ea9800e98598c71fe76c4e2a0d0498b6bd490a83
author Elliott Hughes <enh@google.com> Fri Sep 12 16:33:37 2014 -0700
committer Elliott Hughes <enh@google.com> Fri Oct 03 16:46:20 2014 -0700
tree 6e2bc914417841ec4825e1c79bd981220fe1a416
parent aaad548535c34e2bba16b2a0b71173e0ae4b16c0

Explain why clock(3) isn't broken.

Bug: 17441123
Bug: 17814435

(cherry picked from commit f83c208b82c78dad07f4065f63bdd354f5ef9951)

Change-Id: I2065afe73b79a8d86404edee16e983625d902cdc

libc/bionic/clock.cpp

diff --git a/libc/bionic/clock.cpp b/libc/bionic/clock.cpp
index 98f71af..a2636c6 100644
--- a/libc/bionic/clock.cpp
+++ b/libc/bionic/clock.cpp
@@ -34,5 +34,8 @@
 clock_t clock() {
   tms t;
   times(&t);
+  // Although times(2) and clock(3) both use the type clock_t, the units are
+  // different. For times(2) it's pure clock ticks, but for clock(3) the unit
+  // is CLOCKS_PER_SEC, so we need to scale appropriately.
   return (t.tms_utime + t.tms_stime) * (CLOCKS_PER_SEC / sysconf(_SC_CLK_TCK));
 }