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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1987, 1988, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)time.c   8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/time/time.c,v 1.14.2.5 2002/06/28 08:35:15 tjr Exp $
  32  * $DragonFly: src/usr.bin/time/time.c,v 1.11 2005/03/04 16:54:37 liamfoy Exp $
  33  */
  34
  35 #include <sys/user.h>
  36 #include <sys/time.h>
  37 #include <sys/resource.h>
  38 #include <sys/signal.h>
  39 #include <sys/sysctl.h>
  40 #include <sys/wait.h>
  41
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <kinfo.h>
  45 #include <locale.h>
  46 #include <signal.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 static void humantime(FILE *, long, long);
  53 static void usage(void);
  54
  55 static char decimal_point;
  56
  57 int
  58 main(int argc, char **argv)
  59 {
  60         pid_t pid;
  61         int aflag, ch, hflag, lflag, status, pflag;
  62         int exit_on_sig;
  63         struct timeval before, after;
  64         struct rusage ru;
  65         FILE *out = stderr;
  66         const char *ofn = NULL;
  67
  68         setlocale(LC_NUMERIC, "");
  69         decimal_point = localeconv()->decimal_point[0];
  70
  71         aflag = hflag = lflag = pflag = 0;
  72         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  73                 switch (ch) {
  74                 case 'a':
  75                         aflag = 1;
  76                         break;
  77                 case 'h':
  78                         hflag = 1;
  79                         break;
  80                 case 'l':
  81                         lflag = 1;
  82                         break;
  83                 case 'o':
  84                         ofn = optarg;
  85                         break;
  86                 case 'p':
  87                         pflag = 1;
  88                         break;
  89                 default:
  90                         usage();
  91                 }
  92
  93         if (!(argc -= optind))
  94                 exit(0);
  95         argv += optind;
  96
  97         if (ofn) {
  98                 if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL)
  99                         err(1, "%s", ofn);
 100                 setvbuf(out, NULL, _IONBF, (size_t)0);
 101         }
 102
 103         if (gettimeofday(&before, NULL) == -1)
 104                 err(1, "gettimeofday failed");
 105         switch (pid = fork()) {
 106         case -1:                        /* error */
 107                 err(1, "could not fork");
 108                 /* NOTREACHED */
 109         case 0:                         /* child */
 110                 if (ofn)
 111                         fclose(out);
 112                 execvp(*argv, argv);
 113                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 114                 /* NOTREACHED */
 115         }
 116         /* parent */
 117         if (signal(SIGINT, SIG_IGN) == SIG_ERR)
 118                 err(1, "signal failed");
 119         if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
 120                 err(1, "signal failed");
 121         while (wait4(pid, &status, 0, &ru) != pid)              /* XXX use waitpid */
 122                 ;
 123         if (gettimeofday(&after, NULL) == -1)
 124                 err(1, "gettimeofday failed");
 125         if (!WIFEXITED(status))
 126                 warnx("command terminated abnormally");
 127         exit_on_sig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 128         after.tv_sec -= before.tv_sec;
 129         after.tv_usec -= before.tv_usec;
 130         if (after.tv_usec < 0)
 131                 after.tv_sec--, after.tv_usec += 1000000;
 132         if (pflag) {
 133                 /* POSIX wants output that must look like
 134                 "real %f\nuser %f\nsys %f\n" and requires
 135                 at least two digits after the radix. */
 136                 fprintf(out, "real %ld%c%02ld\n",
 137                         after.tv_sec, decimal_point,
 138                         after.tv_usec / 10000);
 139                 fprintf(out, "user %ld%c%02ld\n",
 140                         ru.ru_utime.tv_sec, decimal_point,
 141                         ru.ru_utime.tv_usec / 10000);
 142                 fprintf(out, "sys %ld%c%02ld\n",
 143                         ru.ru_stime.tv_sec, decimal_point,
 144                         ru.ru_stime.tv_usec / 10000);
 145         } else if (hflag) {
 146                 humantime(out, after.tv_sec, after.tv_usec / 10000);
 147                 fprintf(out, " real\t");
 148                 humantime(out, ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
 149                 fprintf(out, " user\t");
 150                 humantime(out, ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
 151                 fprintf(out, " sys\n");
 152         } else {
 153                 fprintf(out, "%9ld%c%02ld real ",
 154                         after.tv_sec, decimal_point,
 155                         after.tv_usec / 10000);
 156                 fprintf(out, "%9ld%c%02ld user ",
 157                         ru.ru_utime.tv_sec, decimal_point,
 158                         ru.ru_utime.tv_usec / 10000);
 159                 fprintf(out, "%9ld%c%02ld sys\n",
 160                         ru.ru_stime.tv_sec, decimal_point,
 161                         ru.ru_stime.tv_usec / 10000);
 162         }
 163         if (lflag) {
 164                 int hz;
 165                 u_long ticks;
 166
 167                 if (kinfo_get_sched_stathz(&hz))
 168                         err(1, "kinfo_get_sched_stathz");
 169                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 170                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 171
 172                 /*
 173                  * If our round-off on the tick calculation still puts us at 0,
 174                  * then always assume at least one tick.
 175                  */
 176                 if (ticks == 0)
 177                         ticks = 1;
 178
 179                 fprintf(out, "%10ld  %s\n",
 180                         ru.ru_maxrss, "maximum resident set size");
 181                 fprintf(out, "%10ld  %s\n",
 182                         ru.ru_ixrss / ticks, "average shared memory size");
 183                 fprintf(out, "%10ld  %s\n",
 184                         ru.ru_idrss / ticks, "average unshared data size");
 185                 fprintf(out, "%10ld  %s\n",
 186                         ru.ru_isrss / ticks, "average unshared stack size");
 187                 fprintf(out, "%10ld  %s\n",
 188                         ru.ru_minflt, "page reclaims");
 189                 fprintf(out, "%10ld  %s\n",
 190                         ru.ru_majflt, "page faults");
 191                 fprintf(out, "%10ld  %s\n",
 192                         ru.ru_nswap, "swaps");
 193                 fprintf(out, "%10ld  %s\n",
 194                         ru.ru_inblock, "block input operations");
 195                 fprintf(out, "%10ld  %s\n",
 196                         ru.ru_oublock, "block output operations");
 197                 fprintf(out, "%10ld  %s\n",
 198                         ru.ru_msgsnd, "messages sent");
 199                 fprintf(out, "%10ld  %s\n",
 200                         ru.ru_msgrcv, "messages received");
 201                 fprintf(out, "%10ld  %s\n",
 202                         ru.ru_nsignals, "signals received");
 203                 fprintf(out, "%10ld  %s\n",
 204                         ru.ru_nvcsw, "voluntary context switches");
 205                 fprintf(out, "%10ld  %s\n",
 206                         ru.ru_nivcsw, "involuntary context switches");
 207         }
 208         /*
 209          * If the child has exited on a signal, exit on the same
 210          * signal, too, in order to reproduce the child's exit
 211          * status.  However, avoid actually dumping core from
 212          * current process.
 213          */
 214         if (exit_on_sig) {
 215                 if (signal(exit_on_sig, SIG_DFL) == SIG_ERR)
 216                         warn("signal failed");
 217                 else
 218                         kill(getpid(), exit_on_sig);
 219         }
 220         exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 221 }
 222
 223 static void
 224 usage(void)
 225 {
 226         fprintf(stderr,
 227             "usage: time [-al] [-h|-p] [-o file] utility [argument ...]\n");
 228         exit(1);
 229 }
 230
 231 static void
 232 humantime(FILE *out, long sec, long usec)
 233 {
 234         long days, hrs, mins;
 235
 236         days = sec / (60L * 60 * 24);
 237         sec %= (60L * 60 * 24);
 238         hrs = sec / (60L * 60);
 239         sec %= (60L * 60);
 240         mins = sec / 60;
 241         sec %= 60;
 242
 243         fprintf(out, "\t");
 244         if (days)
 245                 fprintf(out, "%ldd", days);
 246         if (hrs)
 247                 fprintf(out, "%ldh", hrs);
 248         if (mins)
 249                 fprintf(out, "%ldm", mins);
 250         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 251 }