[Linux] linux获取进程执行时间方法示例

struct tms {
     clock_t tms_utime;  /* user time */
     clock_t tms_stime;  /* system time */
     clock_t tms_cutime; /* user time of children */
     clock_t tms_cstime; /* system time of children */
  };

#include <sys/times.h>
 
 clock_t times(struct tms *buf);

#include <stdio.h>
#include <stdlib.h>
#include <sys/times.h>
#include <unistd.h>
 
#define BUFFER_SIZE  4 * 1024
int main()
{
  int sc_clk_tck;
  sc_clk_tck = sysconf(_SC_CLK_TCK);
  struct tms begin_tms, end_tms;
  clock_t begin, end;
  system("date");
  begin = times(&begin_tms);
  sleep(2);
  end = times(&end_tms);
  printf("real time: %lf\n", (end - begin) / (double)sc_clk_tck);
  printf("user time: %lf\n",
      (end_tms.tms_utime - begin_tms.tms_utime) / (double)sc_clk_tck);
  printf("sys time: %lf\n",
      (end_tms.tms_stime - begin_tms.tms_stime) / (double)sc_clk_tck);
  printf("child user time: %lf\n",
      (end_tms.tms_cutime - begin_tms.tms_cutime) / (double)sc_clk_tck);
  printf("child sys time: %lf\n",
      (end_tms.tms_cstime - begin_tms.tms_cstime) / (double)sc_clk_tck);
  return 0;
}