On Dec 4, 2011 9:41 PM, "Mike Dodd" <> wrote:
>
>
>
> I wrote a C program that compiles and runs on a TS-7250 under Debian and
> under TS-Linux, but difftime() doesn't operate correctly under TS-Linux.
> Here is a test program:
>
> ---------------
> struct tm *tp = NULL;
> time_t t_now;
> time_t t_last;
> double elapsed_seconds;
>
> t_last = time(NULL);
>
> while(1)
> {
> t_now = time(NULL);
>
> elapsed_seconds = difftime(t_now, t_last); // Get time through loop
> t_last = t_now;
> printf("t_now = %ld, t_last = %ld\n", t_now, t_last);
> printf("elapsed_seconds = %1.1f\n", elapsed_seconds);
>
> sleep(5);
> }
> ---------------
>
> Under Debian, I see the expected 5 seconds for elapsed_seconds each time
> through the loop. But under TS-Linux, elapsed_seconds is always ZERO.
> The t_last and t_now variables are being updated correctly -- 5 seconds
> difference each time -- but the TS-Linux difftime () returns zero.
>
> This is the exact-same code running on Debian and TS-Linux.
>
> Anyone know what's going on?
I have difftime() working under TS-Linux on a 7260. The timing seems to be off a little but I haven't investigated it yet. Gnu libc manual says that time_t is just a double and you can subtract your two values. difftime() is supposed to the be more portable though.
Regards,
Joel
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