Problems with timeval

[ErMenGoL]

Hi!
I'm writing a function that uses the timeval structure but it gives me some problems...
Here is the code:

#if defined(__unix__) || defined(unix)
#include <time.h>
#include <sys/time.h>
#else	/* if win32 */
#include <windows.h>
#endif	/*   unix     */


unsigned long get_msec(void) {
#if defined(__unix__) || defined(unix)
	//static struct 
	struct timeval timev, first_timeval;
	
	gettimeofday(&timev, 0);

	if(first_timeval.tv_sec == 0) {
		first_timeval = timev;
		return 0;
	}
	return (timev.tv_sec - first_timeval.tv_sec) * 1000 + (timev.tv_usec - first_timeval.tv_usec) / 1000;
#else
	return GetTickCount();
#endif	/*   unix   */
}

And the errors I have:


/Users/ermengol87/Documents/EPFL/Advance Computer Graphics/Prova Mandelbrot/../../../../Downloads/sdr_fract 2/timer.c:12:0 /Users/ermengol87/Documents/EPFL/Advance Computer Graphics/Prova Mandelbrot/../../../../Downloads/sdr_fract 2/timer.c:12: error: storage size of 'timev' isn't known


/Users/ermengol87/Documents/EPFL/Advance Computer Graphics/Prova Mandelbrot/../../../../Downloads/sdr_fract 2/timer.c:12:0 /Users/ermengol87/Documents/EPFL/Advance Computer Graphics/Prova Mandelbrot/../../../../Downloads/sdr_fract 2/timer.c:12: error: storage size of 'first_timeval' isn't known

I'm using OS X Snow Leopard and the last version of Xcode.

I hope somebody help me!

[Adak]

#include <time.h>
#include <sys/time.h>

Why do you include both time.h files?

[ErMenGoL]

Why do you include both time.h files?

That was just in a moment of desperation, because I couldn't make it work (and still is not working)

[tabstop]

You can do

gcc -E -o myfile.long myfile.c

to see your code looks like after the preprocessor gets through with it. I don't have a Mac on me to test with at the moment, so I can't say what's in their <sys/time.h> or whether you need a certain #define. Even better, you can just say

man gettimeofday

at your terminal and it will also say what you need.