| /* settime -- set the system clock |
| |
| Copyright (C) 2002, 2004-2007, 2009-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| /* Written by Paul Eggert. */ |
| |
| #include <config.h> |
| |
| #include "timespec.h" |
| |
| #include <sys/time.h> |
| #include <unistd.h> |
| |
| #include <errno.h> |
| |
| /* Set the system time. */ |
| |
| int |
| settime (struct timespec const *ts) |
| { |
| #if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME |
| { |
| int r = clock_settime (CLOCK_REALTIME, ts); |
| if (r == 0 || errno == EPERM) |
| return r; |
| } |
| #endif |
| |
| #if HAVE_SETTIMEOFDAY |
| { |
| struct timeval tv; |
| |
| tv.tv_sec = ts->tv_sec; |
| tv.tv_usec = ts->tv_nsec / 1000; |
| return settimeofday (&tv, 0); |
| } |
| #elif HAVE_STIME |
| /* This fails to compile on OSF1 V5.1, due to stime requiring |
| a 'long int*' and tv_sec is 'int'. But that system does provide |
| settimeofday. */ |
| return stime (&ts->tv_sec); |
| #else |
| errno = ENOSYS; |
| return -1; |
| #endif |
| } |