Re: [ts-7000] TS-Linux difftime

[Walter Marvin <>]

My experience is that not all libraries have all functions implimented. Get the source for the library you are using and see if this is not so.

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From: Craig Gates <>
To:
Cc: Mike Dodd <>
Sent: Monday, December 5, 2011 10:43 AM
Subject: Re: [ts-7000] TS-Linux difftime

 

a google search for the keywords linux difftime  provided this as the second hit:

http://www.linuxquestions.org/questions/programming-9/c-difftime-returns-zero-188574/

google is your friend

regards,
Craig

On 12/4/11 7:41 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?

Thanks for any pointers.

--
Mike

Mike Dodd
Louisa County, VA USA

http://mdodd.com

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