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  * @(#) Copyright (c) 1987, 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)time.c   8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/time/time.c,v 1.14.2.5 2002/06/28 08:35:15 tjr Exp $
  36  * $DragonFly: src/usr.bin/time/time.c,v 1.11 2005/03/04 16:54:37 liamfoy Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41 #include <sys/resource.h>
  42 #include <sys/signal.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/wait.h>
  45
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <kinfo.h>
  49 #include <locale.h>
  50 #include <signal.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 static void humantime(FILE *, long, long);
  57 static void usage(void);
  58
  59 static char decimal_point;
  60
  61 int
  62 main(int argc, char **argv)
  63 {
  64         pid_t pid;
  65         int aflag, ch, hflag, lflag, status, pflag;
  66         int exit_on_sig;
  67         struct timeval before, after;
  68         struct rusage ru;
  69         FILE *out = stderr;
  70         const char *ofn = NULL;
  71
  72         setlocale(LC_NUMERIC, "");
  73         decimal_point = localeconv()->decimal_point[0];
  74
  75         aflag = hflag = lflag = pflag = 0;
  76         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  77                 switch (ch) {
  78                 case 'a':
  79                         aflag = 1;
  80                         break;
  81                 case 'h':
  82                         hflag = 1;
  83                         break;
  84                 case 'l':
  85                         lflag = 1;
  86                         break;
  87                 case 'o':
  88                         ofn = optarg;
  89                         break;
  90                 case 'p':
  91                         pflag = 1;
  92                         break;
  93                 default:
  94                         usage();
  95                 }
  96
  97         if (!(argc -= optind))
  98                 exit(0);
  99         argv += optind;
 100
 101         if (ofn) {
 102                 if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL)
 103                         err(1, "%s", ofn);
 104                 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 105         }
 106
 107         if (gettimeofday(&before, (struct timezone *)NULL) == -1)
 108                 err(1, "gettimeofday failed");
 109         switch (pid = fork()) {
 110         case -1:                        /* error */
 111                 err(1, "could not fork");
 112                 /* NOTREACHED */
 113         case 0:                         /* child */
 114                 execvp(*argv, argv);
 115                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 116                 /* NOTREACHED */
 117         }
 118         /* parent */
 119         if (signal(SIGINT, SIG_IGN) == SIG_ERR)
 120                 err(1, "signal failed");
 121         if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
 122                 err(1, "signal failed");
 123         while (wait4(pid, &status, 0, &ru) != pid)              /* XXX use waitpid */
 124                 ;
 125         if (gettimeofday(&after, (struct timezone *)NULL) == -1)
 126                 err(1, "gettimeofday failed");
 127         if (!WIFEXITED(status))
 128                 warnx("command terminated abnormally");
 129         exit_on_sig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 130         after.tv_sec -= before.tv_sec;
 131         after.tv_usec -= before.tv_usec;
 132         if (after.tv_usec < 0)
 133                 after.tv_sec--, after.tv_usec += 1000000;
 134         if (pflag) {
 135                 /* POSIX wants output that must look like
 136                 "real %f\nuser %f\nsys %f\n" and requires
 137                 at least two digits after the radix. */
 138                 fprintf(out, "real %ld%c%02ld\n",
 139                         after.tv_sec, decimal_point,
 140                         after.tv_usec / 10000);
 141                 fprintf(out, "user %ld%c%02ld\n",
 142                         ru.ru_utime.tv_sec, decimal_point,
 143                         ru.ru_utime.tv_usec / 10000);
 144                 fprintf(out, "sys %ld%c%02ld\n",
 145                         ru.ru_stime.tv_sec, decimal_point,
 146                         ru.ru_stime.tv_usec / 10000);
 147         } else if (hflag) {
 148                 humantime(out, after.tv_sec, after.tv_usec / 10000);
 149                 fprintf(out, " real\t");
 150                 humantime(out, ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
 151                 fprintf(out, " user\t");
 152                 humantime(out, ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
 153                 fprintf(out, " sys\n");
 154         } else {
 155                 fprintf(out, "%9ld%c%02ld real ",
 156                         after.tv_sec, decimal_point,
 157                         after.tv_usec / 10000);
 158                 fprintf(out, "%9ld%c%02ld user ",
 159                         ru.ru_utime.tv_sec, decimal_point,
 160                         ru.ru_utime.tv_usec / 10000);
 161                 fprintf(out, "%9ld%c%02ld sys\n",
 162                         ru.ru_stime.tv_sec, decimal_point,
 163                         ru.ru_stime.tv_usec / 10000);
 164         }
 165         if (lflag) {
 166                 int hz;
 167                 u_long ticks;
 168
 169                 if (kinfo_get_sched_stathz(&hz))
 170                         err(1, "kinfo_get_sched_stathz");
 171                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 172                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 173
 174                 /*
 175                  * If our round-off on the tick calculation still puts us at 0,
 176                  * then always assume at least one tick.
 177                  */
 178                 if (ticks == 0)
 179                         ticks = 1;
 180
 181                 fprintf(out, "%10ld  %s\n",
 182                         ru.ru_maxrss, "maximum resident set size");
 183                 fprintf(out, "%10ld  %s\n",
 184                         ru.ru_ixrss / ticks, "average shared memory size");
 185                 fprintf(out, "%10ld  %s\n",
 186                         ru.ru_idrss / ticks, "average unshared data size");
 187                 fprintf(out, "%10ld  %s\n",
 188                         ru.ru_isrss / ticks, "average unshared stack size");
 189                 fprintf(out, "%10ld  %s\n",
 190                         ru.ru_minflt, "page reclaims");
 191                 fprintf(out, "%10ld  %s\n",
 192                         ru.ru_majflt, "page faults");
 193                 fprintf(out, "%10ld  %s\n",
 194                         ru.ru_nswap, "swaps");
 195                 fprintf(out, "%10ld  %s\n",
 196                         ru.ru_inblock, "block input operations");
 197                 fprintf(out, "%10ld  %s\n",
 198                         ru.ru_oublock, "block output operations");
 199                 fprintf(out, "%10ld  %s\n",
 200                         ru.ru_msgsnd, "messages sent");
 201                 fprintf(out, "%10ld  %s\n",
 202                         ru.ru_msgrcv, "messages received");
 203                 fprintf(out, "%10ld  %s\n",
 204                         ru.ru_nsignals, "signals received");
 205                 fprintf(out, "%10ld  %s\n",
 206                         ru.ru_nvcsw, "voluntary context switches");
 207                 fprintf(out, "%10ld  %s\n",
 208                         ru.ru_nivcsw, "involuntary context switches");
 209         }
 210         /*
 211          * If the child has exited on a signal, exit on the same
 212          * signal, too, in order to reproduce the child's exit
 213          * status.  However, avoid actually dumping core from
 214          * current process.
 215          */
 216         if (exit_on_sig) {
 217                 if (signal(exit_on_sig, SIG_DFL) == SIG_ERR)
 218                         warn("signal failed");
 219                 else
 220                         kill(getpid(), exit_on_sig);
 221         }
 222         exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 223 }
 224
 225 static void
 226 usage(void)
 227 {
 228         fprintf(stderr,
 229             "usage: time [-al] [-h|-p] [-o file] utility [argument ...]\n");
 230         exit(1);
 231 }
 232
 233 static void
 234 humantime(FILE *out, long sec, long usec)
 235 {
 236         long days, hrs, mins;
 237
 238         days = sec / (60L * 60 * 24);
 239         sec %= (60L * 60 * 24);
 240         hrs = sec / (60L * 60);
 241         sec %= (60L * 60);
 242         mins = sec / 60;
 243         sec %= 60;
 244
 245         fprintf(out, "\t");
 246         if (days)
 247                 fprintf(out, "%ldd", days);
 248         if (hrs)
 249                 fprintf(out, "%ldh", hrs);
 250         if (mins)
 251                 fprintf(out, "%ldm", mins);
 252         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 253 }