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 #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_gettime64)
  15 _syscall2_64(int, clock_gettime, clockid_t, clock_id, struct timespec*, tp)
  16 #elif defined(__NR_clock_gettime)
  17 _syscall2(int, clock_gettime, clockid_t, clock_id, struct timespec*, tp)
  18 #else
  19 # include <sys/time.h>
  20
  21 int clock_gettime(clockid_t clock_id, struct timespec* tp)
  22 {
  23         struct timeval tv;
  24         int retval = -1;
  25
  26         switch (clock_id) {
  27                 case CLOCK_REALTIME:
  28                         /* In Linux, gettimeofday fails only on bad parameter.
  29                          * We know that here parameter isn't bad.
  30                          */
  31                         gettimeofday(&tv, NULL);
  32                         TIMEVAL_TO_TIMESPEC(&tv, tp);
  33                         retval = 0;
  34                         break;
  35
  36                 default:
  37                         errno = EINVAL;
  38                         break;
  39         }
  40
  41         return retval;
  42 }
  43 #endif