usr.bin/time/time.c

   1 /*      $NetBSD: time.c,v 1.22 2011/11/09 19:10:10 christos Exp $       */
   2
   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/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1987, 1988, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)time.c      8.1 (Berkeley) 6/6/93";
  41 #endif
  42 __RCSID("$NetBSD: time.c,v 1.22 2011/11/09 19:10:10 christos Exp $");
  43 #endif /* not lint */
  44
  45 #include <sys/types.h>
  46 #include <sys/time.h>
  47 #include <sys/resource.h>
  48 #include <sys/wait.h>
  49 #include <errno.h>
  50 #include <err.h>
  51 #include <locale.h>
  52 #include <signal.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <unistd.h>
  56
  57 #include "ext.h"
  58
  59 __dead static void      usage(void);
  60 static void     prl(long, const char *);
  61 static void     prts(const char *, const char *, const struct timespec *,
  62     const char *);
  63 static void     prtv(const char *, const char *, const struct timeval *,
  64     const char *);
  65
  66 int
  67 main(int argc, char ** volatile argv)
  68 {
  69         int pid;
  70         int ch, status;
  71         int volatile portableflag;
  72         int volatile lflag;
  73         int volatile cshflag;
  74         const char *decpt;
  75         const struct lconv *lconv;
  76         struct timespec before, after;
  77         struct rusage ru;
  78
  79         (void)setlocale(LC_ALL, "");
  80
  81         cshflag = lflag = portableflag = 0;
  82         while ((ch = getopt(argc, argv, "clp")) != -1) {
  83                 switch (ch) {
  84                 case 'c':
  85                         cshflag = 1;
  86                         portableflag = 0;
  87                         lflag = 0;
  88                         break;
  89                 case 'p':
  90                         portableflag = 1;
  91                         cshflag = 0;
  92                         lflag = 0;
  93                         break;
  94                 case 'l':
  95                         lflag = 1;
  96                         portableflag = 0;
  97                         cshflag = 0;
  98                         break;
  99                 case '?':
 100                 default:
 101                         usage();
 102                 }
 103         }
 104         argc -= optind;
 105         argv += optind;
 106
 107         if (argc < 1)
 108                 usage();
 109
 110         (void)clock_gettime(CLOCK_MONOTONIC, &before);
 111         switch(pid = vfork()) {
 112         case -1:                        /* error */
 113                 err(EXIT_FAILURE, "Vfork failed");
 114                 /* NOTREACHED */
 115         case 0:                         /* child */
 116                 /* LINTED will return only on failure */
 117                 execvp(*argv, argv);
 118                 err((errno == ENOENT) ? 127 : 126, "Can't exec `%s'", *argv);
 119                 /* NOTREACHED */
 120         }
 121
 122         /* parent */
 123         (void)signal(SIGINT, SIG_IGN);
 124         (void)signal(SIGQUIT, SIG_IGN);
 125         if ((pid = wait4(pid, &status, 0, &ru)) == -1)
 126                 err(EXIT_FAILURE, "wait4 %d failed", pid);
 127         (void)clock_gettime(CLOCK_MONOTONIC, &after);
 128         if (!WIFEXITED(status))
 129                 warnx("Command terminated abnormally.");
 130         timespecsub(&after, &before, &after);
 131
 132         if ((lconv = localeconv()) == NULL ||
 133             (decpt = lconv->decimal_point) == NULL)
 134                 decpt = ".";
 135
 136         if (cshflag) {
 137                 static struct rusage null_ru;
 138                 before.tv_sec = 0;
 139                 before.tv_nsec = 0;
 140                 prusage(stderr, &null_ru, &ru, &after, &before);
 141         } else if (portableflag) {
 142                 prts("real ", decpt, &after, "\n");
 143                 prtv("user ", decpt, &ru.ru_utime, "\n");
 144                 prtv("sys  ", decpt, &ru.ru_stime, "\n");
 145         } else {
 146                 prts("", decpt, &after, " real ");
 147                 prtv("", decpt, &ru.ru_utime, " user ");
 148                 prtv("", decpt, &ru.ru_stime, " sys\n");
 149         }
 150
 151         if (lflag) {
 152                 int hz = (int)sysconf(_SC_CLK_TCK);
 153                 unsigned long long ticks;
 154 #define SCALE(x) (long)(ticks ? x / ticks : 0)
 155
 156                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 157                     hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 158                 prl(ru.ru_maxrss, "maximum resident set size");
 159                 prl(SCALE(ru.ru_ixrss), "average shared memory size");
 160                 prl(SCALE(ru.ru_idrss), "average unshared data size");
 161                 prl(SCALE(ru.ru_isrss), "average unshared stack size");
 162                 prl(ru.ru_minflt, "page reclaims");
 163                 prl(ru.ru_majflt, "page faults");
 164                 prl(ru.ru_nswap, "swaps");
 165                 prl(ru.ru_inblock, "block input operations");
 166                 prl(ru.ru_oublock, "block output operations");
 167                 prl(ru.ru_msgsnd, "messages sent");
 168                 prl(ru.ru_msgrcv, "messages received");
 169                 prl(ru.ru_nsignals, "signals received");
 170                 prl(ru.ru_nvcsw, "voluntary context switches");
 171                 prl(ru.ru_nivcsw, "involuntary context switches");
 172         }
 173
 174         return (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 175 }
 176
 177 static void
 178 usage(void)
 179 {
 180
 181         (void)fprintf(stderr, "Usage: %s [-clp] utility [argument ...]\n",
 182             getprogname());
 183         exit(EXIT_FAILURE);
 184 }
 185
 186 static void
 187 prl(long val, const char *expn)
 188 {
 189
 190         (void)fprintf(stderr, "%10ld  %s\n", val, expn);
 191 }
 192
 193 static void
 194 prts(const char *pre, const char *decpt, const struct timespec *ts,
 195     const char *post)
 196 {
 197
 198         (void)fprintf(stderr, "%s%9lld%s%02ld%s", pre, (long long)ts->tv_sec,
 199             decpt, (long)ts->tv_nsec / 10000000, post);
 200 }
 201
 202 static void
 203 prtv(const char *pre, const char *decpt, const struct timeval *tv,
 204     const char *post)
 205 {
 206
 207         (void)fprintf(stderr, "%s%9lld%s%02ld%s", pre, (long long)tv->tv_sec,
 208             decpt, (long)tv->tv_usec / 10000, post);
 209 }