pr_cpu_time.c

unix网络编程卷1：套接口API的全书源码

#include	"unp.h"
#include	<sys/resource.h>

#ifndef	HAVE_GETRUSAGE_PROTO
int		getrusage(int, struct rusage *);
#endif

void
pr_cpu_time(void)
{
	double			user, sys;
	struct rusage	myusage, childusage;

	if (getrusage(RUSAGE_SELF, &myusage) < 0)
		err_sys("getrusage error");
	if (getrusage(RUSAGE_CHILDREN, &childusage) < 0)
		err_sys("getrusage error");

	user = (double) myusage.ru_utime.tv_sec +
					myusage.ru_utime.tv_usec/1000000.0;
	user += (double) childusage.ru_utime.tv_sec +
					 childusage.ru_utime.tv_usec/1000000.0;
	sys = (double) myusage.ru_stime.tv_sec +
				   myusage.ru_stime.tv_usec/1000000.0;
	sys += (double) childusage.ru_stime.tv_sec +
					childusage.ru_stime.tv_usec/1000000.0;

	printf("\nuser time = %g, sys time = %g\n", user, sys);
}