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  */
  33
  34 #include <sys/time.h>
  35 #include <sys/resource.h>
  36 #include <sys/signal.h>
  37 #include <sys/wait.h>
  38
  39 #include <err.h>
  40 #include <errno.h>
  41 #ifndef BOOTSTRAPPING
  42 #include <kinfo.h>
  43 #endif
  44 #include <locale.h>
  45 #include <signal.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <stdint.h>
  49 #include <string.h>
  50 #include <time.h>
  51 #include <unistd.h>
  52
  53 static void humantime(FILE *, long, long);
  54 static void showtime(FILE *, struct timespec *, struct timespec *,
  55     struct rusage *);
  56 static void siginfo(int);
  57
  58 static void usage(void);
  59
  60 static sig_atomic_t siginfo_recvd;
  61 static char decimal_point;
  62 struct timespec before_ts;
  63 static int hflag, pflag;
  64
  65 int
  66 main(int argc, char **argv)
  67 {
  68         pid_t pid;
  69         int aflag, ch, lflag, status;
  70         int exit_on_sig;
  71         struct timespec after;
  72         struct rusage ru;
  73         FILE *out = stderr;
  74         const char *ofn = NULL;
  75
  76         setlocale(LC_NUMERIC, "");
  77         decimal_point = localeconv()->decimal_point[0];
  78
  79         aflag = hflag = lflag = pflag = 0;
  80         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  81                 switch (ch) {
  82                 case 'a':
  83                         aflag = 1;
  84                         break;
  85                 case 'h':
  86                         hflag = 1;
  87                         break;
  88                 case 'l':
  89 #ifndef BOOTSTRAPPING
  90                         lflag = 1;
  91 #endif
  92                         break;
  93                 case 'o':
  94                         ofn = optarg;
  95                         break;
  96                 case 'p':
  97                         pflag = 1;
  98                         break;
  99                 default:
 100                         usage();
 101                 }
 102
 103         if (!(argc -= optind))
 104                 exit(0);
 105         argv += optind;
 106
 107         if (ofn) {
 108                 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
 109                         err(1, "%s", ofn);
 110                 setvbuf(out, NULL, _IONBF, (size_t)0);
 111         }
 112
 113         if (clock_gettime(CLOCK_MONOTONIC, &before_ts) == -1)
 114                 err(1, "clock_gettime failed");
 115         switch (pid = fork()) {
 116         case -1:                        /* error */
 117                 err(1, "could not fork");
 118                 /* NOTREACHED */
 119         case 0:                         /* child */
 120                 execvp(*argv, argv);
 121                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 122                 /* NOTREACHED */
 123         }
 124         /* parent */
 125         if (signal(SIGINT, SIG_IGN) == SIG_ERR)
 126                 err(1, "signal failed");
 127         if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
 128                 err(1, "signal failed");
 129         siginfo_recvd = 0;
 130 #ifdef SIGINFO
 131         if (signal(SIGINFO, siginfo) == SIG_ERR)
 132                 err(1, "signal failed");
 133         siginterrupt(SIGINFO,1 );
 134 #endif
 135         while (wait4(pid, &status, 0, &ru) != pid){
 136                 if (siginfo_recvd) {
 137                         siginfo_recvd = 0;
 138                         if (clock_gettime(CLOCK_MONOTONIC, &after) == -1)
 139                                 err(1, "clock_gettime failed");
 140                         getrusage(RUSAGE_CHILDREN, &ru);
 141                         showtime(stdout, &before_ts, &after, &ru);
 142                 }
 143         }
 144         if (clock_gettime(CLOCK_MONOTONIC, &after) == -1)
 145                 err(1, "clock_gettime failed");
 146         if (!WIFEXITED(status))
 147                 warnx("command terminated abnormally");
 148         exit_on_sig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 149         showtime(out, &before_ts, &after, &ru);
 150 #ifndef BOOTSTRAPPING
 151         if (lflag) {
 152                 int hz;
 153                 u_long ticks;
 154
 155                 if (kinfo_get_sched_stathz(&hz))
 156                         err(1, "kinfo_get_sched_stathz");
 157                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 158                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 159
 160                 /*
 161                  * If our round-off on the tick calculation still puts us at 0,
 162                  * then always assume at least one tick.
 163                  */
 164                 if (ticks == 0)
 165                         ticks = 1;
 166
 167                 fprintf(out, "%10ld  %s\n",
 168                         ru.ru_maxrss, "maximum resident set size");
 169                 fprintf(out, "%10ld  %s\n",
 170                         ru.ru_ixrss / ticks, "average shared memory size");
 171                 fprintf(out, "%10ld  %s\n",
 172                         ru.ru_idrss / ticks, "average unshared data size");
 173                 fprintf(out, "%10ld  %s\n",
 174                         ru.ru_isrss / ticks, "average unshared stack size");
 175                 fprintf(out, "%10ld  %s\n",
 176                         ru.ru_minflt, "page reclaims");
 177                 fprintf(out, "%10ld  %s\n",
 178                         ru.ru_majflt, "page faults");
 179                 fprintf(out, "%10ld  %s\n",
 180                         ru.ru_nswap, "swaps");
 181                 fprintf(out, "%10ld  %s\n",
 182                         ru.ru_inblock, "block input operations");
 183                 fprintf(out, "%10ld  %s\n",
 184                         ru.ru_oublock, "block output operations");
 185                 fprintf(out, "%10ld  %s\n",
 186                         ru.ru_msgsnd, "messages sent");
 187                 fprintf(out, "%10ld  %s\n",
 188                         ru.ru_msgrcv, "messages received");
 189                 fprintf(out, "%10ld  %s\n",
 190                         ru.ru_nsignals, "signals received");
 191                 fprintf(out, "%10ld  %s\n",
 192                         ru.ru_nvcsw, "voluntary context switches");
 193                 fprintf(out, "%10ld  %s\n",
 194                         ru.ru_nivcsw, "involuntary context switches");
 195         }
 196 #endif
 197         /*
 198          * If the child has exited on a signal, exit on the same
 199          * signal, too, in order to reproduce the child's exit
 200          * status.  However, avoid actually dumping core from
 201          * current process.
 202          */
 203         if (exit_on_sig) {
 204                 if (signal(exit_on_sig, SIG_DFL) == SIG_ERR)
 205                         warn("signal failed");
 206                 else
 207                         kill(getpid(), exit_on_sig);
 208         }
 209         exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 210 }
 211
 212 static void
 213 usage(void)
 214 {
 215         fprintf(stderr,
 216             "usage: time [-al] [-h|-p] [-o file] utility [argument ...]\n");
 217         exit(1);
 218 }
 219
 220 static void
 221 humantime(FILE *out, long sec, long usec)
 222 {
 223         long days, hrs, mins;
 224
 225         days = sec / (60L * 60 * 24);
 226         sec %= (60L * 60 * 24);
 227         hrs = sec / (60L * 60);
 228         sec %= (60L * 60);
 229         mins = sec / 60;
 230         sec %= 60;
 231
 232         fprintf(out, "\t");
 233         if (days)
 234                 fprintf(out, "%ldd", days);
 235         if (hrs)
 236                 fprintf(out, "%ldh", hrs);
 237         if (mins)
 238                 fprintf(out, "%ldm", mins);
 239         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 240 }
 241
 242 static void
 243 showtime(FILE *out, struct timespec *before, struct timespec *after,
 244     struct rusage *ru)
 245 {
 246
 247         after->tv_sec -= before->tv_sec;
 248         after->tv_nsec -= before->tv_nsec;
 249         if (after->tv_nsec < 0)
 250                 after->tv_sec--, after->tv_nsec += 1000000000L;
 251
 252         if (pflag) {
 253                 /* POSIX wants output that must look like
 254                 "real %f\nuser %f\nsys %f\n" and requires
 255                 at least two digits after the radix. */
 256                 fprintf(out, "real %jd%c%02ld\n",
 257                         (intmax_t)after->tv_sec, decimal_point,
 258                         after->tv_nsec/10000000L);
 259                 fprintf(out, "user %jd%c%02ld\n",
 260                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 261                         ru->ru_utime.tv_usec/10000);
 262                 fprintf(out, "sys %jd%c%02ld\n",
 263                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 264                         ru->ru_stime.tv_usec/10000);
 265         } else if (hflag) {
 266                 humantime(out, after->tv_sec, after->tv_nsec/10000000);
 267                 fprintf(out, " real\t");
 268                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 269                 fprintf(out, " user\t");
 270                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 271                 fprintf(out, " sys\n");
 272         } else {
 273                 fprintf(out, "%9jd%c%02ld real ",
 274                         (intmax_t)after->tv_sec, decimal_point,
 275                         after->tv_nsec/10000000);
 276                 fprintf(out, "%9jd%c%02ld user ",
 277                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 278                         ru->ru_utime.tv_usec/10000);
 279                 fprintf(out, "%9jd%c%02ld sys\n",
 280                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 281                         ru->ru_stime.tv_usec/10000);
 282         }
 283 }
 284
 285 static void
 286 siginfo(int sig __unused)
 287 {
 288         siginfo_recvd = 1;
 289 }