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 #include <sys/types.h>
33 #include <sys/resource.h>
34 #include <sys/signal.h>
35 #include <sys/sysctl.h>
36 #include <sys/time.h>
37 #include <sys/wait.h>
38
39 #include <err.h>
40 #include <errno.h>
41 #include <locale.h>
42 #include <signal.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <stdint.h>
46 #include <string.h>
47 #include <time.h>
48 #include <unistd.h>
49
50 static int getstathz(void);
51 static void humantime(FILE *, long, long);
52 static void showtime(FILE *, struct timespec *, struct timespec *,
53 struct rusage *);
54 static void siginfo(int);
55 static void usage(void) __dead2;
56
57 static volatile sig_atomic_t siginfo_recvd;
58 static char decimal_point;
59 static struct timespec before_ts;
60 static int hflag, pflag;
61
62 int
main(int argc,char ** argv)63 main(int argc, char **argv)
64 {
65 int aflag, ch, lflag, status;
66 int exitonsig;
67 pid_t pid;
68 struct rlimit rl;
69 struct rusage ru;
70 struct timespec after;
71 char *ofn = NULL;
72 FILE *out = stderr;
73
74 (void) setlocale(LC_NUMERIC, "");
75 decimal_point = localeconv()->decimal_point[0];
76
77 aflag = hflag = lflag = pflag = 0;
78 while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
79 switch((char)ch) {
80 case 'a':
81 aflag = 1;
82 break;
83 case 'h':
84 hflag = 1;
85 break;
86 case 'l':
87 lflag = 1;
88 break;
89 case 'o':
90 ofn = optarg;
91 break;
92 case 'p':
93 pflag = 1;
94 break;
95 case '?':
96 default:
97 usage();
98 }
99
100 if (!(argc -= optind))
101 exit(0);
102 argv += optind;
103
104 if (ofn) {
105 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
106 err(1, "%s", ofn);
107 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
108 }
109
110 if (clock_gettime(CLOCK_MONOTONIC, &before_ts))
111 err(1, "clock_gettime");
112 switch(pid = fork()) {
113 case -1: /* error */
114 err(1, "time");
115 /* NOTREACHED */
116 case 0: /* child */
117 execvp(*argv, argv);
118 err(errno == ENOENT ? 127 : 126, "%s", *argv);
119 /* NOTREACHED */
120 }
121 /* parent */
122 (void)signal(SIGINT, SIG_IGN);
123 (void)signal(SIGQUIT, SIG_IGN);
124 siginfo_recvd = 0;
125 (void)signal(SIGINFO, siginfo);
126 (void)siginterrupt(SIGINFO, 1);
127 while (wait4(pid, &status, 0, &ru) != pid) {
128 if (siginfo_recvd) {
129 siginfo_recvd = 0;
130 if (clock_gettime(CLOCK_MONOTONIC, &after))
131 err(1, "clock_gettime");
132 getrusage(RUSAGE_CHILDREN, &ru);
133 showtime(stdout, &before_ts, &after, &ru);
134 }
135 }
136 if (clock_gettime(CLOCK_MONOTONIC, &after))
137 err(1, "clock_gettime");
138 if ( ! WIFEXITED(status))
139 warnx("command terminated abnormally");
140 exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
141 showtime(out, &before_ts, &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
203 static void
usage(void)204 usage(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 */
214 static int
getstathz(void)215 getstathz(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
229 static void
humantime(FILE * out,long sec,long centisec)230 humantime(FILE *out, long sec, long centisec)
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, centisec);
249 }
250
251 static void
showtime(FILE * out,struct timespec * before,struct timespec * after,struct rusage * ru)252 showtime(FILE *out, struct timespec *before, struct timespec *after,
253 struct rusage *ru)
254 {
255
256 after->tv_sec -= before->tv_sec;
257 after->tv_nsec -= before->tv_nsec;
258 if (after->tv_nsec < 0)
259 after->tv_sec--, after->tv_nsec += 1000000000;
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_nsec/10000000);
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_nsec/10000000);
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_nsec/10000000);
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
294 static void
siginfo(int sig __unused)295 siginfo(int sig __unused)
296 {
297
298 siginfo_recvd = 1;
299 }
300