libc/sysdeps/linux/common/clock_settime.c

   1 /*
   2  * clock_settime() for uClibc
   3  *
   4  * Copyright (C) 2005 by Peter Kjellerstedt <pkj@axis.com>
   5  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   6  *
   7  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   8  */
   9
  10 #include <sys/syscall.h>
  11 #include <time.h>
  12
  13
  14 #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_settime64)
  15 #include "internal/time64_helpers.h"
  16
  17 int clock_settime(clockid_t clock_id, const struct timespec *tp)
  18 {
  19         return INLINE_SYSCALL(clock_settime64, 2, clock_id, TO_TS64_P(tp));
  20 }
  21 #elif defined(__NR_clock_settime)
  22 _syscall2(int, clock_settime, clockid_t, clock_id, const struct timespec*, tp)
  23 #else
  24 # include <sys/time.h>
  25
  26 int clock_settime(clockid_t clock_id, const struct timespec* tp)
  27 {
  28         struct timeval tv;
  29         int retval = -1;
  30
  31         if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000) {
  32                 errno = EINVAL;
  33                 return -1;
  34         }
  35
  36         switch (clock_id) {
  37                 case CLOCK_REALTIME:
  38                         TIMESPEC_TO_TIMEVAL(&tv, tp);
  39                         retval = settimeofday(&tv, NULL);
  40                         break;
  41
  42                 default:
  43                         errno = EINVAL;
  44                         break;
  45         }
  46
  47         return retval;
  48 }
  49 #endif