usr/src/cmd/time/time.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 /*
  34  *      Time a command
  35  */
  36
  37 #include        <stdio.h>
  38 #include        <signal.h>
  39 #include        <errno.h>
  40 #include        <stdlib.h>
  41 #include        <unistd.h>
  42 #include        <libintl.h>
  43 #include        <locale.h>
  44 #include        <limits.h>
  45 #include        <sys/types.h>
  46 #include        <sys/times.h>
  47 #include        <sys/wait.h>
  48
  49 /*
  50  * The following use of HZ/10 will work correctly only if HZ is a multiple
  51  * of 10.  However the only values for HZ now in use are 100 for the 3B
  52  * and 60 for other machines.
  53  *
  54  * The first value was HZ/10. Since HZ should be gotten from sysconf()
  55  * it is dynamically initialized at entry to the main program.
  56  */
  57 static clock_t quant[] = { 10, 10, 10, 6, 10, 6, 10, 10, 10 };
  58 static char *pad  = "000      ";
  59 static char *sep  = "\0\0.\0:\0:\0\0";
  60 static char *nsep = "\0\0.\0 \0 \0\0";
  61
  62 static void usage(void);
  63 static void printt(char *, clock_t);
  64
  65 int
  66 main(int argc, char **argv)
  67 {
  68         struct tms      buffer;
  69         pid_t           p;
  70         int             status;
  71         int             pflag           = 0;
  72         int             c;
  73         int             clock_tick      = CLK_TCK;
  74         clock_t         before, after;
  75
  76         (void) setlocale(LC_ALL, "");
  77 #if !defined(TEXT_DOMAIN)
  78 #define TEXT_DOMAIN "SYS_TEST"
  79 #endif
  80         (void) textdomain(TEXT_DOMAIN);
  81
  82         while ((c = getopt(argc, argv, "p")) != EOF)
  83                 switch (c) {
  84                 case 'p':
  85                         pflag++;
  86                         break;
  87                 case '?':
  88                         usage();
  89                 }
  90
  91         argc -= optind;
  92         argv += optind;
  93
  94         /*
  95          * time(1) is only accurate to a tenth of a second.  We need to
  96          * determine the number of clock ticks in a tenth of a second in
  97          * order to later divide away what we don't care about.
  98          */
  99         quant[0] = clock_tick/10;
 100
 101         before = times(&buffer);
 102         if (argc < 1)
 103                 usage();
 104         p = fork();
 105         if (p == (pid_t)-1) {
 106                 perror("time");
 107                 exit(2);
 108         }
 109         if (p == (pid_t)0) {
 110                 (void) execvp(argv[0], &argv[0]);
 111                 perror(argv[0]);
 112                 if (errno == ENOENT)
 113                         exit(127);
 114                 else
 115                         exit(126);
 116         }
 117         (void) signal(SIGINT, SIG_IGN);
 118         (void) signal(SIGQUIT, SIG_IGN);
 119         while (wait(&status) != p);
 120         if ((status & 0377) != '\0')
 121                 (void) fprintf(stderr, "time: %s\n",
 122                     gettext("command terminated abnormally."));
 123         after = times(&buffer);
 124         (void) fprintf(stderr, "\n");
 125         if (pflag)
 126                 (void) fprintf(stderr, "real %.2f\nuser %.2f\nsys %.2f\n",
 127                     (double)(after-before)/clock_tick,
 128                     (double)buffer.tms_cutime/clock_tick,
 129                     (double)buffer.tms_cstime/clock_tick);
 130         else {
 131                 printt("real", (after-before));
 132                 printt("user", buffer.tms_cutime);
 133                 printt("sys ", buffer.tms_cstime);
 134         }
 135
 136         return ((status & 0xff00)
 137                 ? (status >> 8)
 138                 : ((status & 0x00ff) ? ((status & ~WCOREFLG) | 0200) : 0));
 139 }
 140
 141
 142 static void
 143 printt(char *s, clock_t a)
 144 {
 145         int i;
 146         char digit[9];
 147         char c;
 148         int nonzero;
 149
 150         a /= quant[0];  /* Divide away the accuracy we don't care about */
 151
 152         /*
 153          * We now have the number of tenths of seconds elapsed in terms of
 154          * ticks. Loop through to determine the actual digits.
 155          */
 156         for (i = 1; i < 9; i++) {
 157                 digit[i] = a % quant[i];
 158                 a /= quant[i];
 159         }
 160         (void) fprintf(stderr, s);
 161         nonzero = 0;
 162         while (--i > 0) {
 163                 c = (digit[i] != 0) ? digit[i]+'0' : (nonzero ? '0': pad[i]);
 164                 if (c != '\0')
 165                         (void) putc(c, stderr);
 166                 nonzero |= digit[i];
 167                 c = nonzero?sep[i]:nsep[i];
 168                 if (c != '\0')
 169                         (void) putc(c, stderr);
 170         }
 171         (void) fprintf(stderr, "\n");
 172 }
 173
 174 static void
 175 usage(void)
 176 {
 177         (void) fprintf(stderr,
 178             gettext("usage: time [-p] utility [argument...]\n"));
 179         exit(1);
 180 }