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