time.c revision 17351 
1/*
2 * Copyright (c) 1987, 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1987, 1988, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)time.c	8.1 (Berkeley) 6/6/93";
42#endif /* not lint */
43
44#include <sys/types.h>
45#include <sys/time.h>
46#include <sys/resource.h>
47#include <sys/signal.h>
48#include <sys/sysctl.h>
49
50#include <err.h>
51#include <stdio.h>
52
53static int getstathz __P((void));
54
55main(argc, argv)
56	int argc;
57	char **argv;
58{
59	extern int optind;
60	register int pid;
61	int ch, status, lflag;
62	struct timeval before, after;
63	struct rusage ru;
64
65	lflag = 0;
66	while ((ch = getopt(argc, argv, "l")) != EOF)
67		switch((char)ch) {
68		case 'l':
69			lflag = 1;
70			break;
71		case '?':
72		default:
73			fprintf(stderr, "usage: time [-l] command.\n");
74			exit(1);
75		}
76
77	if (!(argc -= optind))
78		exit(0);
79	argv += optind;
80
81	gettimeofday(&before, (struct timezone *)NULL);
82	switch(pid = vfork()) {
83	case -1:			/* error */
84		perror("time");
85		exit(1);
86		/* NOTREACHED */
87	case 0:				/* child */
88		execvp(*argv, argv);
89		perror(*argv);
90		_exit(1);
91		/* NOTREACHED */
92	}
93	/* parent */
94	(void)signal(SIGINT, SIG_IGN);
95	(void)signal(SIGQUIT, SIG_IGN);
96	while (wait3(&status, 0, &ru) != pid);		/* XXX use waitpid */
97	gettimeofday(&after, (struct timezone *)NULL);
98	if (status&0377)
99		fprintf(stderr, "Command terminated abnormally.\n");
100	after.tv_sec -= before.tv_sec;
101	after.tv_usec -= before.tv_usec;
102	if (after.tv_usec < 0)
103		after.tv_sec--, after.tv_usec += 1000000;
104	fprintf(stderr, "%9ld.%02ld real ", after.tv_sec, after.tv_usec/10000);
105	fprintf(stderr, "%9ld.%02ld user ",
106	    ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000);
107	fprintf(stderr, "%9ld.%02ld sys\n",
108	    ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000);
109	if (lflag) {
110		int hz = getstathz();
111		u_long ticks;
112
113		ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
114		     hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
115
116		/*
117		 * If our round-off on the tick calculation still puts us at 0,
118		 * then always assume at least one tick.
119		 */
120		if (ticks == 0)
121			ticks = 1;
122
123		fprintf(stderr, "%10ld  %s\n",
124			ru.ru_maxrss, "maximum resident set size");
125		fprintf(stderr, "%10ld  %s\n",
126			ru.ru_ixrss / ticks, "average shared memory size");
127		fprintf(stderr, "%10ld  %s\n",
128			ru.ru_idrss / ticks, "average unshared data size");
129		fprintf(stderr, "%10ld  %s\n",
130			ru.ru_isrss / ticks, "average unshared stack size");
131		fprintf(stderr, "%10ld  %s\n",
132			ru.ru_minflt, "page reclaims");
133		fprintf(stderr, "%10ld  %s\n",
134			ru.ru_majflt, "page faults");
135		fprintf(stderr, "%10ld  %s\n",
136			ru.ru_nswap, "swaps");
137		fprintf(stderr, "%10ld  %s\n",
138			ru.ru_inblock, "block input operations");
139		fprintf(stderr, "%10ld  %s\n",
140			ru.ru_oublock, "block output operations");
141		fprintf(stderr, "%10ld  %s\n",
142			ru.ru_msgsnd, "messages sent");
143		fprintf(stderr, "%10ld  %s\n",
144			ru.ru_msgrcv, "messages received");
145		fprintf(stderr, "%10ld  %s\n",
146			ru.ru_nsignals, "signals received");
147		fprintf(stderr, "%10ld  %s\n",
148			ru.ru_nvcsw, "voluntary context switches");
149		fprintf(stderr, "%10ld  %s\n",
150			ru.ru_nivcsw, "involuntary context switches");
151	}
152	exit (status>>8);
153}
154
155/*
156 * Return the frequency of the kernel's statistics clock.
157 */
158static int
159getstathz()
160{
161	struct clockinfo clockrate;
162	int mib[2];
163	size_t size;
164
165	mib[0] = CTL_KERN;
166	mib[1] = KERN_CLOCKRATE;
167	size = sizeof clockrate;
168	if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
169		err(1, "sysctl kern.clockrate");
170	return clockrate.stathz;
171}
172