Re: [RFC v3 01/23] sysdeps/nanosleep: Use clock_nanosleep_time64 if avaliable

[Stepan Golosunov <stepan@golosunov.pp.ru>]

19.07.2019 в 10:25:46 -0700 Alistair Francis написал:
> On Tue, Jul 16, 2019 at 10:16 PM Florian Weimer <fweimer@redhat.com> wrote:
> >
> > * Alistair Francis:
> >
> > > +#if __TIMESIZE == 32
> > > +struct timespec64
> > > +{
> > > +  long int tv_sec;   /* Seconds.  */
> > > +  long int tv_nsec;  /* Nanoseconds.  */
> > > +};
> > > +#endif
> > > +
> > >  int
> > >  thrd_sleep (const struct timespec* time_point, struct timespec* remaining)
> > >  {
> > >    INTERNAL_SYSCALL_DECL (err);
> > > -  int ret = INTERNAL_SYSCALL_CANCEL (nanosleep, err, time_point, remaining);
> > > +  int ret;
> > > +
> > > +#ifdef __ASSUME_TIME64_SYSCALLS
> > > +  ret = INTERNAL_SYSCALL_CANCEL (clock_nanosleep_time64, err, CLOCK_REALTIME,
> > > +                                 0, time_point, remaining);
> > > +#else
> > > +# ifdef __NR_clock_nanosleep_time64
> > > +#  if __TIMESIZE == 64
> > > +  long int ret_64;
> > > +
> > > +  ret_64 = INTERNAL_SYSCALL_CANCEL (clock_nanosleep_time64, err, CLOCK_REALTIME,
> > > +                                    0, time_point, remaining);
> > > +
> > > +  if (ret_64 == 0 || errno != ENOSYS)
> > > +    ret = ret_64;
> > > +#  else
> > > +  timespec64 ts;
> > > +
> > > +  ret = INTERNAL_SYSCALL_CANCEL (clock_nanosleep_time64, err,
> > > +                                 CLOCK_REALTIME, 0, time_point,
> > > +                                 ts);
> > > +
> > > +  if (ret == 0 || errno != ENOSYS) {
> > > +    remaining->tv_sec = ts.tv_sec;
> > > +    remaining->tv_nsec = ts.tv_nsec;
> > > +    return ret;
> > > +  }
> > > +#  endif
> > > +# endif
> > > +  ret =  INTERNAL_SYSCALL_CANCEL (nanosleep, err, time_point, remaining);
> > > +#endif
> > > +
> >
> > I think this changes the ABI of thrd_sleep if
> > __NR_clock_nanosleep_time64 is defined (and __NR_nanosleep was defined
> > before).
> 
> I'm not sure I understand, which part changes the ABI?

Parts where time_point (2 cases) and remaining (1 case) are passed to
the clock_nanosleep_time64 syscall while __TIMESIZE == 32.