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path: root/src/libstddjb/tain_stopwatch.c
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/* ISC license. */

#include <skalibs/sysdeps.h>
#include <skalibs/tai.h>

#if defined(SKALIBS_HASCLOCKRT) && (defined(SKALIBS_HASCLOCKMON) || defined(SKALIBS_HASCLOCKBOOT))

#include <time.h>

int tain_stopwatch_init (clock_t cl, tain_t *offset)
{
  tain_t a, b ;
  struct timespec ts ;
  if (!tain_wallclock_read(&a)) return 0 ;
  if (clock_gettime(cl, &ts) < 0) return 0 ;
  if (!tain_from_timespec(&b, &ts)) return 0 ;
  tain_add(&a, &a, &tain_nano500) ;
  tain_sub(offset, &a, &b) ;
  return 1 ;
}

int tain_stopwatch_read (tain_t *a, clock_t cl, tain_t const *offset)
{
  struct timespec ts ;
  if (clock_gettime(cl, &ts) < 0) return 0 ;
  if (!tain_from_timespec(a, &ts)) return 0 ;
  tain_add(a, a, offset) ;
  return 1 ;
}

#else

#include <errno.h>

int tain_stopwatch_init (clock_t cl, tain_t *offset)
{
  (void)cl ;
  (void)offset ;
  return (errno = ENOSYS, 0) ;
}

int tain_stopwatch_read (tain_t *a, clock_t cl, tain_t const *offset)
{
  (void)a ;
  (void)cl ;
  (void)offset ;
  return (errno = ENOSYS, 0) ;
}

#endif