[RFC v4 06/24] sysdeps/timespec_get: Use clock_gettime64 if avaliable

[Alistair Francis]

On Thu, Aug 15, 2019 at 2:19 PM Joseph Myers <joseph@codesourcery.com> wrote:
>
> On Thu, 15 Aug 2019, Alistair Francis wrote:
>
> > There is no internal header for timespec_get, would you prefer me to
> > create one or put the define in time/time.h?
>
> time/time.h is an installed header, so it mustn't go there.
> include/time.h would be fine (it has several such defines, for
> __localtime64 etc.).

Ok, I have this in include/time.h:

#if __TIMESIZE == 64
#define timespec_get __timespec_get64
#else

and this in the c file:

/* Set TS to calendar time based in time base BASE.  */
int
__timespec_get64 (struct timespec *ts, int base)
{
  switch (base)
    {
      int res;
      INTERNAL_SYSCALL_DECL (err);
    case TIME_UTC:
#ifdef __ASSUME_TIME64_SYSCALLS
# ifndef __NR_clock_gettime64
#  define __NR_clock_gettime64 __NR_clock_gettime
# endif
  res = INTERNAL_VSYSCALL (clock_gettime64, err, 2, CLOCK_REALTIME, ts);
#else
# ifdef __NR_clock_gettime64
  res = INTERNAL_VSYSCALL (clock_gettime64, err, 2, CLOCK_REALTIME, ts);
# endif /* __NR_clock_gettime64 */
  struct timespec ts32;

  if (! in_time_t_range (ts->tv_sec))
    {
      __set_errno (EOVERFLOW);
      return -1;
    }

  valid_timespec64_to_timespec (ts, &ts32);
  res = INTERNAL_VSYSCALL (clock_gettime, err, 2, CLOCK_REALTIME, &ts32);

  if (res == 0 || !INTERNAL_SYSCALL_ERROR_P (res, err))
    {
      ts->tv_sec = ts32.tv_sec;
      ts->tv_nsec = ts32.tv_nsec;
    }
#endif

      if (INTERNAL_SYSCALL_ERROR_P (res, err))
        return 0;
      break;

    default:
      return 0;
    }

  return base;
}

#if __TIMESIZE != 64
int
timespec_get (struct timespec *ts, int base)
{
  struct __timespec64 ts64;

  ret = __timespec_get64 (ts64, base);

  if (res == 0 || !INTERNAL_SYSCALL_ERROR_P (res, err))
    {
      ts->tv_sec = ts64.tv_sec;
      ts->tv_nsec = ts64.tv_nsec;
    }

  return ret;
}
#endif

Alistair

>
> --
> Joseph S. Myers
> joseph@codesourcery.com