sysdeps/unix/clock_settime.c

   1 /* Copyright (C) 1999-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <time.h>
  20 #include <sys/time.h>
  21 #include <shlib-compat.h>
  22
  23 /* Set CLOCK to value TP.  */
  24 int
  25 __clock_settime (clockid_t clock_id, const struct timespec *tp)
  26 {
  27   int retval = -1;
  28
  29   /* Make sure the time cvalue is OK.  */
  30   if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000)
  31     {
  32       __set_errno (EINVAL);
  33       return -1;
  34     }
  35
  36   switch (clock_id)
  37     {
  38     case CLOCK_REALTIME:
  39       {
  40         struct timeval tv;
  41         TIMESPEC_TO_TIMEVAL (&tv, tp);
  42         retval = __settimeofday (&tv, NULL);
  43       }
  44       break;
  45
  46     default:
  47       __set_errno (EINVAL);
  48       break;
  49     }
  50
  51   return retval;
  52 }
  53 libc_hidden_def (__clock_settime)
  54
  55 versioned_symbol (libc, __clock_settime, clock_settime, GLIBC_2_17);
  56 /* clock_settime moved to libc in version 2.17;
  57    old binaries may expect the symbol version it had in librt.  */
  58 #if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
  59 strong_alias (__clock_settime, __clock_settime_2);
  60 compat_symbol (libc, __clock_settime_2, clock_settime, GLIBC_2_2);
  61 #endif