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