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annotate lib/settime.c @ 6075:ea0e673b670d

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Recent regex patches.
author Paul Eggert <eggert@cs.ucla.edu>
date Sat, 20 Aug 2005 01:03:31 +0000
parents a48fb0e98c8c
children fd0ccce602e4
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1 /* settime -- set the system clock
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2 Copyright (C) 2002, 2004 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 /* Written by Paul Eggert. */
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19
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20 #ifdef HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 #include "timespec.h"
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25
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26 #if HAVE_UNISTD_H
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27 # include <unistd.h>
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28 #endif
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29
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30 #include <errno.h>
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31
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32 /* Some systems don't have ENOSYS. */
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33 #ifndef ENOSYS
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34 # ifdef ENOTSUP
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35 # define ENOSYS ENOTSUP
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36 # else
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37 /* Some systems don't have ENOTSUP either. */
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38 # define ENOSYS EINVAL
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39 # endif
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40 #endif
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41
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42 /* Set the system time. */
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43
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44 int
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45 settime (struct timespec const *ts)
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46 {
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47 #if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
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48 {
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49 int r = clock_settime (CLOCK_REALTIME, ts);
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50 if (r == 0 || errno == EPERM)
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51 return r;
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52 }
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53 #endif
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54
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55 #if HAVE_SETTIMEOFDAY
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56 {
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57 struct timeval tv;
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58 int r;
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59
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60 tv.tv_sec = ts->tv_sec;
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61 tv.tv_usec = ts->tv_nsec / 1000;
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62 r = settimeofday (&tv, 0);
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63 if (r == 0 || errno == EPERM)
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64 return r;
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65 }
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66 #endif
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67
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68 #if HAVE_STIME
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69 return stime (&ts->tv_sec);
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70 #else
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71 errno = ENOSYS;
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72 return -1;
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73 #endif
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74 }