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 <stdatomic.h>
44 #include <stdbool.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <stdint.h>
48 #include <string.h>
49 #include <time.h>
50 #include <unistd.h>
51
52 static int getstathz(void);
53 static void humantime(FILE *, long, long);
54 static void showtime(FILE *, struct timespec *, struct timespec *,
55 struct rusage *);
56 static void siginfo(int);
57 static void usage(void) __dead2;
58
59 static sig_atomic_t siginfo_recvd;
60 static char decimal_point;
61 static struct timespec before_ts;
62 static int hflag, pflag;
63
64 int
main(int argc,char ** argv)65 main(int argc, char **argv)
66 {
67 int aflag, ch, lflag, status;
68 int exitonsig;
69 pid_t pid;
70 struct rlimit rl;
71 struct rusage ru;
72 struct timespec after;
73 char *ofn = NULL;
74 FILE *out = stderr;
75
76 (void) setlocale(LC_NUMERIC, "");
77 decimal_point = localeconv()->decimal_point[0];
78
79 aflag = hflag = lflag = pflag = 0;
80 while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
81 switch((char)ch) {
82 case 'a':
83 aflag = 1;
84 break;
85 case 'h':
86 hflag = 1;
87 break;
88 case 'l':
89 lflag = 1;
90 break;
91 case 'o':
92 ofn = optarg;
93 break;
94 case 'p':
95 pflag = 1;
96 break;
97 case '?':
98 default:
99 usage();
100 }
101
102 if (!(argc -= optind))
103 exit(0);
104 argv += optind;
105
106 if (ofn) {
107 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
108 err(1, "%s", ofn);
109 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
110 }
111
112 if (clock_gettime(CLOCK_MONOTONIC, &before_ts))
113 err(1, "clock_gettime");
114 switch(pid = fork()) {
115 case -1: /* error */
116 err(1, "time");
117 /* NOTREACHED */
118 case 0: /* child */
119 execvp(*argv, argv);
120 err(errno == ENOENT ? 127 : 126, "%s", *argv);
121 /* NOTREACHED */
122 }
123 /* parent */
124 (void)signal(SIGINT, SIG_IGN);
125 (void)signal(SIGQUIT, SIG_IGN);
126 siginfo_recvd = 0;
127 (void)signal(SIGINFO, siginfo);
128 (void)siginterrupt(SIGINFO, 1);
129 while (wait4(pid, &status, 0, &ru) != pid) {
130 bool do_siginfo = siginfo_recvd != 0;
131
132 atomic_signal_fence(memory_order_acquire);
133 if (do_siginfo) {
134 siginfo_recvd = 0;
135 if (clock_gettime(CLOCK_MONOTONIC, &after))
136 err(1, "clock_gettime");
137 getrusage(RUSAGE_CHILDREN, &ru);
138 showtime(stdout, &before_ts, &after, &ru);
139 }
140 }
141 if (clock_gettime(CLOCK_MONOTONIC, &after))
142 err(1, "clock_gettime");
143 if ( ! WIFEXITED(status))
144 warnx("command terminated abnormally");
145 exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
146 showtime(out, &before_ts, &after, &ru);
147 if (lflag) {
148 int hz = getstathz();
149 u_long ticks;
150
151 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
152 hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
153
154 /*
155 * If our round-off on the tick calculation still puts us at 0,
156 * then always assume at least one tick.
157 */
158 if (ticks == 0)
159 ticks = 1;
160
161 fprintf(out, "%10ld %s\n",
162 ru.ru_maxrss, "maximum resident set size");
163 fprintf(out, "%10ld %s\n",
164 ru.ru_ixrss / ticks, "average shared memory size");
165 fprintf(out, "%10ld %s\n",
166 ru.ru_idrss / ticks, "average unshared data size");
167 fprintf(out, "%10ld %s\n",
168 ru.ru_isrss / ticks, "average unshared stack size");
169 fprintf(out, "%10ld %s\n",
170 ru.ru_minflt, "page reclaims");
171 fprintf(out, "%10ld %s\n",
172 ru.ru_majflt, "page faults");
173 fprintf(out, "%10ld %s\n",
174 ru.ru_nswap, "swaps");
175 fprintf(out, "%10ld %s\n",
176 ru.ru_inblock, "block input operations");
177 fprintf(out, "%10ld %s\n",
178 ru.ru_oublock, "block output operations");
179 fprintf(out, "%10ld %s\n",
180 ru.ru_msgsnd, "messages sent");
181 fprintf(out, "%10ld %s\n",
182 ru.ru_msgrcv, "messages received");
183 fprintf(out, "%10ld %s\n",
184 ru.ru_nsignals, "signals received");
185 fprintf(out, "%10ld %s\n",
186 ru.ru_nvcsw, "voluntary context switches");
187 fprintf(out, "%10ld %s\n",
188 ru.ru_nivcsw, "involuntary context switches");
189 }
190 /*
191 * If the child has exited on a signal, exit on the same
192 * signal, too, in order to reproduce the child's exit status.
193 * However, avoid actually dumping core from the current process.
194 */
195 if (exitonsig) {
196 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
197 warn("signal");
198 else {
199 rl.rlim_max = rl.rlim_cur = 0;
200 if (setrlimit(RLIMIT_CORE, &rl) == -1)
201 warn("setrlimit");
202 kill(getpid(), exitonsig);
203 }
204 }
205 exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
206 }
207
208 static void
usage(void)209 usage(void)
210 {
211 fprintf(stderr,
212 "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
213 exit(1);
214 }
215
216 /*
217 * Return the frequency of the kernel's statistics clock.
218 */
219 static int
getstathz(void)220 getstathz(void)
221 {
222 int mib[2];
223 size_t size;
224 struct clockinfo clockrate;
225
226 mib[0] = CTL_KERN;
227 mib[1] = KERN_CLOCKRATE;
228 size = sizeof clockrate;
229 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
230 err(1, "sysctl kern.clockrate");
231 return clockrate.stathz;
232 }
233
234 static void
humantime(FILE * out,long sec,long centisec)235 humantime(FILE *out, long sec, long centisec)
236 {
237 long days, hrs, mins;
238
239 days = sec / (60L * 60 * 24);
240 sec %= (60L * 60 * 24);
241 hrs = sec / (60L * 60);
242 sec %= (60L * 60);
243 mins = sec / 60;
244 sec %= 60;
245
246 fprintf(out, "\t");
247 if (days)
248 fprintf(out, "%ldd", days);
249 if (hrs)
250 fprintf(out, "%ldh", hrs);
251 if (mins)
252 fprintf(out, "%ldm", mins);
253 fprintf(out, "%ld%c%02lds", sec, decimal_point, centisec);
254 }
255
256 static void
showtime(FILE * out,struct timespec * before,struct timespec * after,struct rusage * ru)257 showtime(FILE *out, struct timespec *before, struct timespec *after,
258 struct rusage *ru)
259 {
260
261 after->tv_sec -= before->tv_sec;
262 after->tv_nsec -= before->tv_nsec;
263 if (after->tv_nsec < 0)
264 after->tv_sec--, after->tv_nsec += 1000000000;
265
266 if (pflag) {
267 /* POSIX wants output that must look like
268 "real %f\nuser %f\nsys %f\n" and requires
269 at least two digits after the radix. */
270 fprintf(out, "real %jd%c%02ld\n",
271 (intmax_t)after->tv_sec, decimal_point,
272 after->tv_nsec/10000000);
273 fprintf(out, "user %jd%c%02ld\n",
274 (intmax_t)ru->ru_utime.tv_sec, decimal_point,
275 ru->ru_utime.tv_usec/10000);
276 fprintf(out, "sys %jd%c%02ld\n",
277 (intmax_t)ru->ru_stime.tv_sec, decimal_point,
278 ru->ru_stime.tv_usec/10000);
279 } else if (hflag) {
280 humantime(out, after->tv_sec, after->tv_nsec/10000000);
281 fprintf(out, " real\t");
282 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
283 fprintf(out, " user\t");
284 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
285 fprintf(out, " sys\n");
286 } else {
287 fprintf(out, "%9jd%c%02ld real ",
288 (intmax_t)after->tv_sec, decimal_point,
289 after->tv_nsec/10000000);
290 fprintf(out, "%9jd%c%02ld user ",
291 (intmax_t)ru->ru_utime.tv_sec, decimal_point,
292 ru->ru_utime.tv_usec/10000);
293 fprintf(out, "%9jd%c%02ld sys\n",
294 (intmax_t)ru->ru_stime.tv_sec, decimal_point,
295 ru->ru_stime.tv_usec/10000);
296 }
297 }
298
299 static void
siginfo(int sig __unused)300 siginfo(int sig __unused)
301 {
302
303 siginfo_recvd = 1;
304 atomic_signal_fence(memory_order_release);
305 }
306