1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1987, 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1987, 1988, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)time.c	8.1 (Berkeley) 6/6/93";
41#endif
42static const char rcsid[] =
43  "$FreeBSD$";
44#endif /* not lint */
45
46#include <sys/types.h>
47#include <sys/resource.h>
48#include <sys/signal.h>
49#include <sys/sysctl.h>
50#include <sys/time.h>
51#include <sys/wait.h>
52
53#include <err.h>
54#include <errno.h>
55#include <locale.h>
56#include <signal.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <stdint.h>
60#include <string.h>
61#include <time.h>
62#include <unistd.h>
63
64static int getstathz(void);
65static void humantime(FILE *, long, long);
66static void showtime(FILE *, struct timespec *, struct timespec *,
67    struct rusage *);
68static void siginfo(int);
69static void usage(void);
70
71static sig_atomic_t siginfo_recvd;
72static char decimal_point;
73static struct timespec before_ts;
74static int hflag, pflag;
75
76int
77main(int argc, char **argv)
78{
79	int aflag, ch, lflag, status;
80	int exitonsig;
81	pid_t pid;
82	struct rlimit rl;
83	struct rusage ru;
84	struct timespec after;
85	char *ofn = NULL;
86	FILE *out = stderr;
87
88	(void) setlocale(LC_NUMERIC, "");
89	decimal_point = localeconv()->decimal_point[0];
90
91	aflag = hflag = lflag = pflag = 0;
92	while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
93		switch((char)ch) {
94		case 'a':
95			aflag = 1;
96			break;
97		case 'h':
98			hflag = 1;
99			break;
100		case 'l':
101			lflag = 1;
102			break;
103		case 'o':
104			ofn = optarg;
105			break;
106		case 'p':
107			pflag = 1;
108			break;
109		case '?':
110		default:
111			usage();
112		}
113
114	if (!(argc -= optind))
115		exit(0);
116	argv += optind;
117
118	if (ofn) {
119	        if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
120		        err(1, "%s", ofn);
121		setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
122	}
123
124	if (clock_gettime(CLOCK_MONOTONIC, &before_ts))
125		err(1, "clock_gettime");
126	switch(pid = fork()) {
127	case -1:			/* error */
128		err(1, "time");
129		/* NOTREACHED */
130	case 0:				/* child */
131		execvp(*argv, argv);
132		err(errno == ENOENT ? 127 : 126, "%s", *argv);
133		/* NOTREACHED */
134	}
135	/* parent */
136	(void)signal(SIGINT, SIG_IGN);
137	(void)signal(SIGQUIT, SIG_IGN);
138	siginfo_recvd = 0;
139	(void)signal(SIGINFO, siginfo);
140	(void)siginterrupt(SIGINFO, 1);
141	while (wait4(pid, &status, 0, &ru) != pid) {
142		if (siginfo_recvd) {
143			siginfo_recvd = 0;
144			if (clock_gettime(CLOCK_MONOTONIC, &after))
145				err(1, "clock_gettime");
146			getrusage(RUSAGE_CHILDREN, &ru);
147			showtime(stdout, &before_ts, &after, &ru);
148		}
149	}
150	if (clock_gettime(CLOCK_MONOTONIC, &after))
151		err(1, "clock_gettime");
152	if ( ! WIFEXITED(status))
153		warnx("command terminated abnormally");
154	exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
155	showtime(out, &before_ts, &after, &ru);
156	if (lflag) {
157		int hz = getstathz();
158		u_long ticks;
159
160		ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
161		     hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
162
163		/*
164		 * If our round-off on the tick calculation still puts us at 0,
165		 * then always assume at least one tick.
166		 */
167		if (ticks == 0)
168			ticks = 1;
169
170		fprintf(out, "%10ld  %s\n",
171			ru.ru_maxrss, "maximum resident set size");
172		fprintf(out, "%10ld  %s\n",
173			ru.ru_ixrss / ticks, "average shared memory size");
174		fprintf(out, "%10ld  %s\n",
175			ru.ru_idrss / ticks, "average unshared data size");
176		fprintf(out, "%10ld  %s\n",
177			ru.ru_isrss / ticks, "average unshared stack size");
178		fprintf(out, "%10ld  %s\n",
179			ru.ru_minflt, "page reclaims");
180		fprintf(out, "%10ld  %s\n",
181			ru.ru_majflt, "page faults");
182		fprintf(out, "%10ld  %s\n",
183			ru.ru_nswap, "swaps");
184		fprintf(out, "%10ld  %s\n",
185			ru.ru_inblock, "block input operations");
186		fprintf(out, "%10ld  %s\n",
187			ru.ru_oublock, "block output operations");
188		fprintf(out, "%10ld  %s\n",
189			ru.ru_msgsnd, "messages sent");
190		fprintf(out, "%10ld  %s\n",
191			ru.ru_msgrcv, "messages received");
192		fprintf(out, "%10ld  %s\n",
193			ru.ru_nsignals, "signals received");
194		fprintf(out, "%10ld  %s\n",
195			ru.ru_nvcsw, "voluntary context switches");
196		fprintf(out, "%10ld  %s\n",
197			ru.ru_nivcsw, "involuntary context switches");
198	}
199	/*
200	 * If the child has exited on a signal, exit on the same
201	 * signal, too, in order to reproduce the child's exit status.
202	 * However, avoid actually dumping core from the current process.
203	 */
204	if (exitonsig) {
205		if (signal(exitonsig, SIG_DFL) == SIG_ERR)
206			warn("signal");
207		else {
208			rl.rlim_max = rl.rlim_cur = 0;
209			if (setrlimit(RLIMIT_CORE, &rl) == -1)
210				warn("setrlimit");
211			kill(getpid(), exitonsig);
212		}
213	}
214	exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
215}
216
217static void
218usage(void)
219{
220	fprintf(stderr,
221	    "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
222	exit(1);
223}
224
225/*
226 * Return the frequency of the kernel's statistics clock.
227 */
228static int
229getstathz(void)
230{
231	int mib[2];
232	size_t size;
233	struct clockinfo clockrate;
234
235	mib[0] = CTL_KERN;
236	mib[1] = KERN_CLOCKRATE;
237	size = sizeof clockrate;
238	if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
239		err(1, "sysctl kern.clockrate");
240	return clockrate.stathz;
241}
242
243static void
244humantime(FILE *out, long sec, long centisec)
245{
246	long days, hrs, mins;
247
248	days = sec / (60L * 60 * 24);
249	sec %= (60L * 60 * 24);
250	hrs = sec / (60L * 60);
251	sec %= (60L * 60);
252	mins = sec / 60;
253	sec %= 60;
254
255	fprintf(out, "\t");
256	if (days)
257		fprintf(out, "%ldd", days);
258	if (hrs)
259		fprintf(out, "%ldh", hrs);
260	if (mins)
261		fprintf(out, "%ldm", mins);
262	fprintf(out, "%ld%c%02lds", sec, decimal_point, centisec);
263}
264
265static void
266showtime(FILE *out, struct timespec *before, struct timespec *after,
267    struct rusage *ru)
268{
269
270	after->tv_sec -= before->tv_sec;
271	after->tv_nsec -= before->tv_nsec;
272	if (after->tv_nsec < 0)
273		after->tv_sec--, after->tv_nsec += 1000000000;
274
275	if (pflag) {
276		/* POSIX wants output that must look like
277		"real %f\nuser %f\nsys %f\n" and requires
278		at least two digits after the radix. */
279		fprintf(out, "real %jd%c%02ld\n",
280			(intmax_t)after->tv_sec, decimal_point,
281			after->tv_nsec/10000000);
282		fprintf(out, "user %jd%c%02ld\n",
283			(intmax_t)ru->ru_utime.tv_sec, decimal_point,
284			ru->ru_utime.tv_usec/10000);
285		fprintf(out, "sys %jd%c%02ld\n",
286			(intmax_t)ru->ru_stime.tv_sec, decimal_point,
287			ru->ru_stime.tv_usec/10000);
288	} else if (hflag) {
289		humantime(out, after->tv_sec, after->tv_nsec/10000000);
290		fprintf(out, " real\t");
291		humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
292		fprintf(out, " user\t");
293		humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
294		fprintf(out, " sys\n");
295	} else {
296		fprintf(out, "%9jd%c%02ld real ",
297			(intmax_t)after->tv_sec, decimal_point,
298			after->tv_nsec/10000000);
299		fprintf(out, "%9jd%c%02ld user ",
300			(intmax_t)ru->ru_utime.tv_sec, decimal_point,
301			ru->ru_utime.tv_usec/10000);
302		fprintf(out, "%9jd%c%02ld sys\n",
303			(intmax_t)ru->ru_stime.tv_sec, decimal_point,
304			ru->ru_stime.tv_usec/10000);
305	}
306}
307
308static void
309siginfo(int sig __unused)
310{
311
312	siginfo_recvd = 1;
313}
314