resusg1.c

基于网络编程的例子

/*
 * resusg1.c - Get process times
 */
#include <stdio.h>
#include <stdlib.h>
#include <sys/times.h>
#include <time.h>
#include <unistd.h>

void doit(char *, clock_t);

int main(void)
{
    clock_t start, end;
    struct tms t_start, t_end;
    
    start = times(&t_start);	
    /* Redirect output to prevent screen clutter */
    system("grep the /usr/doc/*/* > /dev/null 2> /dev/null");
    end = times(&t_end);       
    
    doit("elapsed", end - start);
    
    puts("parent times");
    doit("\tuser CPU", t_end.tms_utime);
    doit("\tsys  CPU", t_end.tms_stime);
    
    puts("child times");
    doit("\tuser CPU", t_end.tms_cutime);
    doit("\tsys  CPU", t_end.tms_cstime);
    
    exit(EXIT_SUCCESS);
}

void doit(char *str, clock_t time)
{
    /* Get clock ticks/second */
    long tps = sysconf(_SC_CLK_TCK);
    
    printf("%s: %6.2f secs\n", str, (float)time/tps);
}