/* settime -- set the system clock Copyright (C) 2002, 2004, 2005, 2006, 2007 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 2, 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* Written by Paul Eggert. */ #include #include "timespec.h" #include #include #include /* Some systems don't have ENOSYS. */ #ifndef ENOSYS # ifdef ENOTSUP # define ENOSYS ENOTSUP # else /* Some systems don't have ENOTSUP either. */ # define ENOSYS EINVAL # endif #endif /* 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 }