time.c

#include <sys/types.h>
#include <sys/times.h>

main()
{
    struct tms before, after;

    times(&before);

    /* ... place code to be timed here ... */

    times(&after);

    printf("User time: %ld seconds\n", after.tms_utime -
        before.tms_utime);
    printf("System time: %ld seconds\n", after.tms_stime -
        before.tms_stime);

    exit(0);
}