int gettimeofday( struct timeval * timev, struct timezone * timez);
il suffit de faire
#include <time.h>
#include <sys/time.h>
if(gettimeofday(&timev,NULL)!=0){
perror("gettimeofday" );
exit(1);
}
fprintf(stdout, "time = %ld.%06ld\n",timev.tv_sec,timev.tv_usec);