[PATCHv3 00/24] ILP32 support in ARM64

[Paul Eggert]

On 02/17/2015 10:38 AM, Zack Weinberg wrote:
> I expect the
> overwhelming majority of programs print tv_nsec by converting it to
> _double_  for ease of combination with tv_sec.
No, because that loses precision.  The most common solution in portable 
programs is to convert tv_nsec to 'long' (or to 'int' -- that's good 
enough for POSIX) before printing.  This works on both POSIX and x32 
GNU/Linux.  One needs to convert tv_sec anyway, and it's easy to convert 
tv_nsec too.  Something like this, say:

   int
   printf_timespec (struct timespec ts)
   {
     if ((time_t) -1 < 0)
       return printf ("%jd.%.9d", (intmax_t) ts.tv_sec, (int) ts.tv_nsec);
     else
       return printf ("%ju.%.9d", (uintmax_t) ts.tv_sec, (int) ts.tv_nsec);
   }

Typical GNU software already does this sort of thing.