time.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 61 行

#ifndef lint
static	char *sccsid = "@(#)time.c	4.5 (Berkeley) 7/1/83";
#endif

/*
 * time
 */
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>

main(argc, argv)
	int argc;
	char **argv;
{
	int status;
	register int p;
	struct timeval before, after;
	struct rusage ru;

	if (argc<=1)
		exit(0);
	gettimeofday(&before, 0);
	p = fork();
	if (p < 0) {
		perror("time");
		exit(1);
	}
	if (p == 0) {
		execvp(argv[1], &argv[1]);
		perror(argv[1]);
		exit(1);
	}
	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	while (wait3(&status, 0, &ru) != p)
		;
	gettimeofday(&after, 0);
	if ((status&0377) != 0)
		fprintf(stderr, "Command terminated abnormally.\n");
	after.tv_sec -= before.tv_sec;
	after.tv_usec -= before.tv_usec;
	if (after.tv_usec < 0)
		after.tv_sec--, after.tv_usec += 1000000;
	printt("real", &after);
	printt("user", &ru.ru_utime);
	printt("sys ", &ru.ru_stime);
	fprintf(stderr, "\n");
	exit (status>>8);
}

printt(s, tv)
	char *s;
	struct timeval *tv;
{

	fprintf(stderr, "%9d.%01d %s ", tv->tv_sec, tv->tv_usec/100000, s);
}