diff options
author | Joseph Myers <joseph@codesourcery.com> | 2021-05-17 20:55:21 +0000 |
---|---|---|
committer | Joseph Myers <joseph@codesourcery.com> | 2021-05-17 20:55:21 +0000 |
commit | e5ac7bd679de52f70b52b2d0c2135de8d57cba8c (patch) | |
tree | fbdc25a5d8de6301c5bdd0131a5d9ee38697f6db /time/timespec_getres.c | |
parent | c6b6b4f2c7ff62abf5da617bff9d8080631993c0 (diff) | |
download | glibc-e5ac7bd679de52f70b52b2d0c2135de8d57cba8c.tar.gz glibc-e5ac7bd679de52f70b52b2d0c2135de8d57cba8c.tar.xz glibc-e5ac7bd679de52f70b52b2d0c2135de8d57cba8c.zip |
Add C2X timespec_getres
ISO C2X adds a timespec_getres function alongside the C11 timespec_get, with functionality similar to that of POSIX clock_getres (including allowing a NULL pointer to be passed to the function). Implement this function for glibc, similarly to the implementation of timespec_get. This includes a basic test like that of timespec_get, but no documentation in the manual, given that TIME_UTC and timespec_get aren't documented in the manual at all. The handling of 64-bit time follows that in timespec_get; people maintaining patch series for 64-bit time will need to update them accordingly (to export __timespec_getres64, redirect calls in time.h and run the test for _TIME_BITS=64). Tested for x86_64 and x86, and (previous version; only testcase differs) with build-many-glibcs.py.
Diffstat (limited to 'time/timespec_getres.c')
-rw-r--r-- | time/timespec_getres.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/time/timespec_getres.c b/time/timespec_getres.c new file mode 100644 index 0000000000..2a5f6ede76 --- /dev/null +++ b/time/timespec_getres.c @@ -0,0 +1,32 @@ +/* Get resolution of a time base. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <time.h> + + +/* Set TS to resolution of time base BASE. */ +int +timespec_getres (struct timespec *ts, int base) +{ + if (base == TIME_UTC) + { + __clock_getres (CLOCK_REALTIME, ts); + return base; + } + return 0; +} |