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
33 static 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
40 static char sccsid[] = "@(#)time.c 8.1 (Berkeley) 6/6/93";
41 #endif
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 <time.h>
60 #include <unistd.h>
61
62 static int getstathz(void);
63 static void humantime(FILE *, long, long);
64 static void showtime(FILE *, struct timespec *, struct timespec *,
65 struct rusage *);
66 static void siginfo(int);
67 static void usage(void) __dead2;
68
69 static sig_atomic_t siginfo_recvd;
70 static char decimal_point;
71 static struct timespec before_ts;
72 static int hflag, pflag;
73
74 int
main(int argc,char ** argv)75 main(int argc, char **argv)
76 {
77 int aflag, ch, lflag, status;
78 int exitonsig;
79 pid_t pid;
80 struct rlimit rl;
81 struct rusage ru;
82 struct timespec after;
83 char *ofn = NULL;
84 FILE *out = stderr;
85
86 (void) setlocale(LC_NUMERIC, "");
87 decimal_point = localeconv()->decimal_point[0];
88
89 aflag = hflag = lflag = pflag = 0;
90 while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
91 switch((char)ch) {
92 case 'a':
93 aflag = 1;
94 break;
95 case 'h':
96 hflag = 1;
97 break;
98 case 'l':
99 lflag = 1;
100 break;
101 case 'o':
102 ofn = optarg;
103 break;
104 case 'p':
105 pflag = 1;
106 break;
107 case '?':
108 default:
109 usage();
110 }
111
112 if (!(argc -= optind))
113 exit(0);
114 argv += optind;
115
116 if (ofn) {
117 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
118 err(1, "%s", ofn);
119 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
120 }
121
122 if (clock_gettime(CLOCK_MONOTONIC, &before_ts))
123 err(1, "clock_gettime");
124 switch(pid = fork()) {
125 case -1: /* error */
126 err(1, "time");
127 /* NOTREACHED */
128 case 0: /* child */
129 execvp(*argv, argv);
130 err(errno == ENOENT ? 127 : 126, "%s", *argv);
131 /* NOTREACHED */
132 }
133 /* parent */
134 (void)signal(SIGINT, SIG_IGN);
135 (void)signal(SIGQUIT, SIG_IGN);
136 siginfo_recvd = 0;
137 (void)signal(SIGINFO, siginfo);
138 (void)siginterrupt(SIGINFO, 1);
139 while (wait4(pid, &status, 0, &ru) != pid) {
140 if (siginfo_recvd) {
141 siginfo_recvd = 0;
142 if (clock_gettime(CLOCK_MONOTONIC, &after))
143 err(1, "clock_gettime");
144 getrusage(RUSAGE_CHILDREN, &ru);
145 showtime(stdout, &before_ts, &after, &ru);
146 }
147 }
148 if (clock_gettime(CLOCK_MONOTONIC, &after))
149 err(1, "clock_gettime");
150 if ( ! WIFEXITED(status))
151 warnx("command terminated abnormally");
152 exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
153 showtime(out, &before_ts, &after, &ru);
154 if (lflag) {
155 int hz = getstathz();
156 u_long ticks;
157
158 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
159 hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
160
161 /*
162 * If our round-off on the tick calculation still puts us at 0,
163 * then always assume at least one tick.
164 */
165 if (ticks == 0)
166 ticks = 1;
167
168 fprintf(out, "%10ld %s\n",
169 ru.ru_maxrss, "maximum resident set size");
170 fprintf(out, "%10ld %s\n",
171 ru.ru_ixrss / ticks, "average shared memory size");
172 fprintf(out, "%10ld %s\n",
173 ru.ru_idrss / ticks, "average unshared data size");
174 fprintf(out, "%10ld %s\n",
175 ru.ru_isrss / ticks, "average unshared stack size");
176 fprintf(out, "%10ld %s\n",
177 ru.ru_minflt, "page reclaims");
178 fprintf(out, "%10ld %s\n",
179 ru.ru_majflt, "page faults");
180 fprintf(out, "%10ld %s\n",
181 ru.ru_nswap, "swaps");
182 fprintf(out, "%10ld %s\n",
183 ru.ru_inblock, "block input operations");
184 fprintf(out, "%10ld %s\n",
185 ru.ru_oublock, "block output operations");
186 fprintf(out, "%10ld %s\n",
187 ru.ru_msgsnd, "messages sent");
188 fprintf(out, "%10ld %s\n",
189 ru.ru_msgrcv, "messages received");
190 fprintf(out, "%10ld %s\n",
191 ru.ru_nsignals, "signals received");
192 fprintf(out, "%10ld %s\n",
193 ru.ru_nvcsw, "voluntary context switches");
194 fprintf(out, "%10ld %s\n",
195 ru.ru_nivcsw, "involuntary context switches");
196 }
197 /*
198 * If the child has exited on a signal, exit on the same
199 * signal, too, in order to reproduce the child's exit status.
200 * However, avoid actually dumping core from the current process.
201 */
202 if (exitonsig) {
203 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
204 warn("signal");
205 else {
206 rl.rlim_max = rl.rlim_cur = 0;
207 if (setrlimit(RLIMIT_CORE, &rl) == -1)
208 warn("setrlimit");
209 kill(getpid(), exitonsig);
210 }
211 }
212 exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
213 }
214
215 static void
usage(void)216 usage(void)
217 {
218 fprintf(stderr,
219 "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
220 exit(1);
221 }
222
223 /*
224 * Return the frequency of the kernel's statistics clock.
225 */
226 static int
getstathz(void)227 getstathz(void)
228 {
229 int mib[2];
230 size_t size;
231 struct clockinfo clockrate;
232
233 mib[0] = CTL_KERN;
234 mib[1] = KERN_CLOCKRATE;
235 size = sizeof clockrate;
236 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
237 err(1, "sysctl kern.clockrate");
238 return clockrate.stathz;
239 }
240
241 static void
humantime(FILE * out,long sec,long centisec)242 humantime(FILE *out, long sec, long centisec)
243 {
244 long days, hrs, mins;
245
246 days = sec / (60L * 60 * 24);
247 sec %= (60L * 60 * 24);
248 hrs = sec / (60L * 60);
249 sec %= (60L * 60);
250 mins = sec / 60;
251 sec %= 60;
252
253 fprintf(out, "\t");
254 if (days)
255 fprintf(out, "%ldd", days);
256 if (hrs)
257 fprintf(out, "%ldh", hrs);
258 if (mins)
259 fprintf(out, "%ldm", mins);
260 fprintf(out, "%ld%c%02lds", sec, decimal_point, centisec);
261 }
262
263 static void
showtime(FILE * out,struct timespec * before,struct timespec * after,struct rusage * ru)264 showtime(FILE *out, struct timespec *before, struct timespec *after,
265 struct rusage *ru)
266 {
267
268 after->tv_sec -= before->tv_sec;
269 after->tv_nsec -= before->tv_nsec;
270 if (after->tv_nsec < 0)
271 after->tv_sec--, after->tv_nsec += 1000000000;
272
273 if (pflag) {
274 /* POSIX wants output that must look like
275 "real %f\nuser %f\nsys %f\n" and requires
276 at least two digits after the radix. */
277 fprintf(out, "real %jd%c%02ld\n",
278 (intmax_t)after->tv_sec, decimal_point,
279 after->tv_nsec/10000000);
280 fprintf(out, "user %jd%c%02ld\n",
281 (intmax_t)ru->ru_utime.tv_sec, decimal_point,
282 ru->ru_utime.tv_usec/10000);
283 fprintf(out, "sys %jd%c%02ld\n",
284 (intmax_t)ru->ru_stime.tv_sec, decimal_point,
285 ru->ru_stime.tv_usec/10000);
286 } else if (hflag) {
287 humantime(out, after->tv_sec, after->tv_nsec/10000000);
288 fprintf(out, " real\t");
289 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
290 fprintf(out, " user\t");
291 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
292 fprintf(out, " sys\n");
293 } else {
294 fprintf(out, "%9jd%c%02ld real ",
295 (intmax_t)after->tv_sec, decimal_point,
296 after->tv_nsec/10000000);
297 fprintf(out, "%9jd%c%02ld user ",
298 (intmax_t)ru->ru_utime.tv_sec, decimal_point,
299 ru->ru_utime.tv_usec/10000);
300 fprintf(out, "%9jd%c%02ld sys\n",
301 (intmax_t)ru->ru_stime.tv_sec, decimal_point,
302 ru->ru_stime.tv_usec/10000);
303 }
304 }
305
306 static void
siginfo(int sig __unused)307 siginfo(int sig __unused)
308 {
309
310 siginfo_recvd = 1;
311 }
312