diff options
Diffstat (limited to 'lib/settime.c')
-rw-r--r-- | lib/settime.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/settime.c b/lib/settime.c new file mode 100644 index 0000000..25e7e68 --- /dev/null +++ b/lib/settime.c @@ -0,0 +1,71 @@ +/* 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 <config.h> + +#include "timespec.h" + +#include <sys/time.h> +#include <unistd.h> + +#include <errno.h> + +/* 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 +} |