time.h

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

int main()
{
    struct timeval curr;
    gettimeofday(&curr, NULL);

    printf("tv_sec:%lu\n", curr.tv_sec);
    printf("tv_usec(microseconds 1/1,000,000):%lu\n", curr.tv_usec);
    return 0;
}