八_进程控制14 - 进程时间

#include "unistd.h"
#include "sys/times.h"
#include "stdio.h"
#include "errno.h"
#include "sys/param.h"

void PrintTime(clock_t realTime,struct tms* startTime,struct tms* endTime)
{
	static long int clocktic=0;
	clocktic = sysconf(_SC_CLK_TCK);
	if(clocktic < 0)
		fprintf(stderr,"sysconf err");

	//注意 clock_t 是float类型，而clocktic 是long。运算需要类型转换
	fprintf(stdout,"real time : %f\n",realTime/(float)clocktic);
	fprintf(stdout,"Parent user cpu time : %f\n",(endTime->tms_utime - startTime->tms_utime)/(float)clocktic);
	fprintf(stdout,"Parent sys cpu time : %f\n",(endTime->tms_stime - startTime->tms_stime)/(float)clocktic);
	fprintf(stdout,"Child user cpu time : %f\n",(endTime->tms_cutime - startTime->tms_cutime)/(float)clocktic);
	fprintf(stdout,"Child sys cpu time : %f\n",(endTime->tms_cstime - startTime->tms_cstime)/(float)clocktic);

}

static void DoCmd(char *cmd)
{
	clock_t start,end;
	struct tms tms_start,tms_end; 
	int ret;
		
	start = times(&tms_start);
	if(start == -1)
		fprintf(stderr,"times err");

	if(system(cmd)<0)
		fprintf(stderr,"system err");

	end = times(&tms_end);
	if(end == -1)
		fprintf(stderr,"times err");
	
	PrintTime(end-start,&tms_start,&tms_end);

}

int main(int argc,char* argv[])
{	
	int i=0;
	for(i=1; i < argc; i++){
		DoCmd(argv[i]);
	}
	exit(0);
}



mhr@ubuntu:~/Desktop/xitongbiancheng/test$ ./a.out "date" "sleep 5" "man bash > /dev/null" 
2024年 04月 23日 星期二 02:14:07 PDT
real time : 0.010000
Parent user cpu time : 0.000000
Parent sys cpu time : 0.000000
Child user cpu time : 0.000000
Child sys cpu time : 0.000000


real time : 5.000000
Parent user cpu time : 0.000000
Parent sys cpu time : 0.000000
Child user cpu time : 0.000000
Child sys cpu time : 0.000000
real time : 0.260000
Parent user cpu time : 0.000000
Parent sys cpu time : 0.000000
Child user cpu time : 0.160000
Child sys cpu time : 0.030000
mhr@ubuntu:~/Desktop/xitongbiancheng/test$