agent: Use clock or clock_gettime for calibration.
authorNIIBE Yutaka <gniibe@fsij.org>
Tue, 7 Nov 2017 01:49:36 +0000 (10:49 +0900)
committerNIIBE Yutaka <gniibe@fsij.org>
Tue, 7 Nov 2017 01:49:36 +0000 (10:49 +0900)
commit380bce13d94ff03c96e39ac1d834f382c5c730a1
treeae6197075332012aad92bc85eeb1e5b89a24dcf0
parent42308224d1fce64c666aed2be5eb4ef42e8aced4
agent: Use clock or clock_gettime for calibration.

* agent/protect.c (calibrate_get_time): Use clock or clock_gettime.

--

For calibration, clock(3) is better than times(3) among UNIXen.
Tested on NetBSD 7.1 and FreeBSD 11.1, using QEMU.

Thanks to Damien Goutte-Gattat for the information of use of
CLOCKS_PER_SEC;  The old code with times(3) is not 100% correct,
in terms of POSIX.  It should have used sysconf (_SC_CLK_TCK) instead
of CLOCKS_PER_SEC.  CLOCKS_PER_SEC is specifically for clock(3).

GnuPG-bug-id: 3056, 3276, 3472
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
agent/protect.c
agent/t-protect.c