/usr.bin/time/time.c

  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 * 4. Neither the name of the University nor the names of its contributors
 14 *    may be used to endorse or promote products derived from this software
 15 *    without specific prior written permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 27 * SUCH DAMAGE.
 28 */
 29
 30#ifndef lint
 31static const char copyright[] =
 32"@(#) Copyright (c) 1987, 1988, 1993\n\
 33	The Regents of the University of California.  All rights reserved.\n";
 34#endif /* not lint */
 35
 36#ifndef lint
 37#if 0
 38static char sccsid[] = "@(#)time.c	8.1 (Berkeley) 6/6/93";
 39#endif
 40static const char rcsid[] =
 41  "$FreeBSD$";
 42#endif /* not lint */
 43
 44#include <sys/types.h>
 45#include <sys/resource.h>
 46#include <sys/signal.h>
 47#include <sys/sysctl.h>
 48#include <sys/time.h>
 49#include <sys/wait.h>
 50
 51#include <err.h>
 52#include <errno.h>
 53#include <locale.h>
 54#include <signal.h>
 55#include <stdio.h>
 56#include <stdlib.h>
 57#include <stdint.h>
 58#include <string.h>
 59#include <unistd.h>
 60
 61static int getstathz(void);
 62static void humantime(FILE *, long, long);
 63static void showtime(FILE *, struct timeval *, struct timeval *,
 64    struct rusage *);
 65static void siginfo(int);
 66static void usage(void);
 67
 68static char decimal_point;
 69static struct timeval before_tv;
 70static int hflag, pflag;
 71
 72int
 73main(int argc, char **argv)
 74{
 75	int aflag, ch, lflag, status;
 76	int exitonsig;
 77	pid_t pid;
 78	struct rlimit rl;
 79	struct rusage ru;
 80	struct timeval after;
 81	char *ofn = NULL;
 82	FILE *out = stderr;
 83
 84	(void) setlocale(LC_NUMERIC, "");
 85	decimal_point = localeconv()->decimal_point[0];
 86
 87	aflag = hflag = lflag = pflag = 0;
 88	while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
 89		switch((char)ch) {
 90		case 'a':
 91			aflag = 1;
 92			break;
 93		case 'h':
 94			hflag = 1;
 95			break;
 96		case 'l':
 97			lflag = 1;
 98			break;
 99		case 'o':
100			ofn = optarg;
101			break;
102		case 'p':
103			pflag = 1;
104			break;
105		case '?':
106		default:
107			usage();
108		}
109
110	if (!(argc -= optind))
111		exit(0);
112	argv += optind;
113
114	if (ofn) {
115	        if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL)
116		        err(1, "%s", ofn);
117		setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
118	}
119
120	(void)gettimeofday(&before_tv, NULL);
121	switch(pid = fork()) {
122	case -1:			/* error */
123		err(1, "time");
124		/* NOTREACHED */
125	case 0:				/* child */
126		if (ofn)
127			fclose(out);
128		execvp(*argv, argv);
129		err(errno == ENOENT ? 127 : 126, "%s", *argv);
130		/* NOTREACHED */
131	}
132	/* parent */
133	(void)signal(SIGINT, SIG_IGN);
134	(void)signal(SIGQUIT, SIG_IGN);
135	(void)signal(SIGINFO, siginfo);
136	while (wait4(pid, &status, 0, &ru) != pid);
137	(void)gettimeofday(&after, NULL);
138	if ( ! WIFEXITED(status))
139		warnx("command terminated abnormally");
140	exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
141	showtime(out, &before_tv, &after, &ru);
142	if (lflag) {
143		int hz = getstathz();
144		u_long ticks;
145
146		ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
147		     hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
148
149		/*
150		 * If our round-off on the tick calculation still puts us at 0,
151		 * then always assume at least one tick.
152		 */
153		if (ticks == 0)
154			ticks = 1;
155
156		fprintf(out, "%10ld  %s\n",
157			ru.ru_maxrss, "maximum resident set size");
158		fprintf(out, "%10ld  %s\n",
159			ru.ru_ixrss / ticks, "average shared memory size");
160		fprintf(out, "%10ld  %s\n",
161			ru.ru_idrss / ticks, "average unshared data size");
162		fprintf(out, "%10ld  %s\n",
163			ru.ru_isrss / ticks, "average unshared stack size");
164		fprintf(out, "%10ld  %s\n",
165			ru.ru_minflt, "page reclaims");
166		fprintf(out, "%10ld  %s\n",
167			ru.ru_majflt, "page faults");
168		fprintf(out, "%10ld  %s\n",
169			ru.ru_nswap, "swaps");
170		fprintf(out, "%10ld  %s\n",
171			ru.ru_inblock, "block input operations");
172		fprintf(out, "%10ld  %s\n",
173			ru.ru_oublock, "block output operations");
174		fprintf(out, "%10ld  %s\n",
175			ru.ru_msgsnd, "messages sent");
176		fprintf(out, "%10ld  %s\n",
177			ru.ru_msgrcv, "messages received");
178		fprintf(out, "%10ld  %s\n",
179			ru.ru_nsignals, "signals received");
180		fprintf(out, "%10ld  %s\n",
181			ru.ru_nvcsw, "voluntary context switches");
182		fprintf(out, "%10ld  %s\n",
183			ru.ru_nivcsw, "involuntary context switches");
184	}
185	/*
186	 * If the child has exited on a signal, exit on the same
187	 * signal, too, in order to reproduce the child's exit status.
188	 * However, avoid actually dumping core from the current process.
189	 */
190	if (exitonsig) {
191		if (signal(exitonsig, SIG_DFL) == SIG_ERR)
192			warn("signal");
193		else {
194			rl.rlim_max = rl.rlim_cur = 0;
195			if (setrlimit(RLIMIT_CORE, &rl) == -1)
196				warn("setrlimit");
197			kill(getpid(), exitonsig);
198		}
199	}
200	exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
201}
202
203static void
204usage(void)
205{
206	fprintf(stderr,
207	    "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
208	exit(1);
209}
210
211/*
212 * Return the frequency of the kernel's statistics clock.
213 */
214static int
215getstathz(void)
216{
217	int mib[2];
218	size_t size;
219	struct clockinfo clockrate;
220
221	mib[0] = CTL_KERN;
222	mib[1] = KERN_CLOCKRATE;
223	size = sizeof clockrate;
224	if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
225		err(1, "sysctl kern.clockrate");
226	return clockrate.stathz;
227}
228
229static void
230humantime(FILE *out, long sec, long usec)
231{
232	long days, hrs, mins;
233
234	days = sec / (60L * 60 * 24);
235	sec %= (60L * 60 * 24);
236	hrs = sec / (60L * 60);
237	sec %= (60L * 60);
238	mins = sec / 60;
239	sec %= 60;
240
241	fprintf(out, "\t");
242	if (days)
243		fprintf(out, "%ldd", days);
244	if (hrs)
245		fprintf(out, "%ldh", hrs);
246	if (mins)
247		fprintf(out, "%ldm", mins);
248	fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
249}
250
251static void
252showtime(FILE *out, struct timeval *before, struct timeval *after,
253    struct rusage *ru)
254{
255
256	after->tv_sec -= before->tv_sec;
257	after->tv_usec -= before->tv_usec;
258	if (after->tv_usec < 0)
259		after->tv_sec--, after->tv_usec += 1000000;
260
261	if (pflag) {
262		/* POSIX wants output that must look like
263		"real %f\nuser %f\nsys %f\n" and requires
264		at least two digits after the radix. */
265		fprintf(out, "real %jd%c%02ld\n",
266			(intmax_t)after->tv_sec, decimal_point,
267			after->tv_usec/10000);
268		fprintf(out, "user %jd%c%02ld\n",
269			(intmax_t)ru->ru_utime.tv_sec, decimal_point,
270			ru->ru_utime.tv_usec/10000);
271		fprintf(out, "sys %jd%c%02ld\n",
272			(intmax_t)ru->ru_stime.tv_sec, decimal_point,
273			ru->ru_stime.tv_usec/10000);
274	} else if (hflag) {
275		humantime(out, after->tv_sec, after->tv_usec/10000);
276		fprintf(out, " real\t");
277		humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
278		fprintf(out, " user\t");
279		humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
280		fprintf(out, " sys\n");
281	} else {
282		fprintf(out, "%9jd%c%02ld real ",
283			(intmax_t)after->tv_sec, decimal_point,
284			after->tv_usec/10000);
285		fprintf(out, "%9jd%c%02ld user ",
286			(intmax_t)ru->ru_utime.tv_sec, decimal_point,
287			ru->ru_utime.tv_usec/10000);
288		fprintf(out, "%9jd%c%02ld sys\n",
289			(intmax_t)ru->ru_stime.tv_sec, decimal_point,
290			ru->ru_stime.tv_usec/10000);
291	}
292}
293
294static void
295siginfo(int sig __unused)
296{
297	struct timeval after;
298	struct rusage ru;
299
300	(void)gettimeofday(&after, NULL);
301	getrusage(RUSAGE_CHILDREN, &ru);
302	showtime(stdout, &before_tv, &after, &ru);
303}