libc/sysdeps/linux/common/clock_gettime.c

   1 /*
   2  * clock_gettime() for uClibc
   3  *
   4  * Copyright (C) 2003 by Justus Pendleton <uc@ryoohki.net>
   5  * Copyright (C) 2005 by Peter Kjellerstedt <pkj@axis.com>
   6  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   7  *
   8  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   9  */
  10
  11 #include <sys/syscall.h>
  12 #include <time.h>
  13
  14 #ifdef __VDSO_SUPPORT__
  15 #include "ldso.h"
  16 #endif
  17
  18 #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_gettime64)
  19 #include "internal/time64_helpers.h"
  20
  21 int __libc_clock_gettime(clockid_t clock_id, struct timespec *tp)
  22 {
  23         struct __ts64_struct __ts64;
  24         int __ret = INLINE_SYSCALL(clock_gettime64, 2, clock_id, &__ts64);
  25         if (tp) {
  26                 tp->tv_sec = __ts64.tv_sec;
  27                 tp->tv_nsec = __ts64.tv_nsec;
  28         }
  29
  30         return __ret;
  31 }
  32 #elif defined(__NR_clock_gettime)
  33 int __libc_clock_gettime(clockid_t clock_id, struct timespec *tp)
  34 {
  35         return INLINE_SYSCALL(clock_gettime, 2, clock_id, tp);
  36 }
  37 #else
  38 # include <sys/time.h>
  39
  40 int __libc_clock_gettime(clockid_t clock_id, struct timespec* tp)
  41 {
  42         struct timeval tv;
  43         int retval = -1;
  44
  45         switch (clock_id) {
  46                 case CLOCK_REALTIME:
  47                         /* In Linux, gettimeofday fails only on bad parameter.
  48                          * We know that here parameter isn't bad.
  49                          */
  50                         gettimeofday(&tv, NULL);
  51                         TIMEVAL_TO_TIMESPEC(&tv, tp);
  52                         retval = 0;
  53                         break;
  54
  55                 default:
  56                         errno = EINVAL;
  57                         break;
  58         }
  59
  60         return retval;
  61 }
  62 #endif
  63
  64 int clock_gettime(clockid_t clock_id, struct timespec *tp)
  65 {
  66 #if defined(__VDSO_SUPPORT__) && defined(ARCH_VDSO_CLOCK_GETTIME)
  67         return ARCH_VDSO_CLOCK_GETTIME(clock_id, tp);
  68 #else
  69         return __libc_clock_gettime(clock_id, tp);
  70 #endif
  71 }