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  * 4. 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
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1987, 1988, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)time.c      8.1 (Berkeley) 6/6/93";
  39 #endif
  40 static const char rcsid[] =
  41   "$FreeBSD$";
  42 #endif /* not lint */
  43
  44 #include <sys/types.h>
  45 #include <sys/resource.h>
  46 #include <sys/signal.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/time.h>
  49 #include <sys/wait.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <locale.h>
  54 #include <signal.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <stdint.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60
  61 static int getstathz(void);
  62 static void humantime(FILE *, long, long);
  63 static void showtime(FILE *, struct timeval *, struct timeval *,
  64     struct rusage *);
  65 static void siginfo(int);
  66 static void usage(void);
  67
  68 static char decimal_point;
  69 static struct timeval before_tv;
  70 static int hflag, pflag;
  71
  72 int
  73 main(int argc, char **argv)
  74 {
  75         int aflag, ch, lflag, status;
  76         int exitonsig;
  77         pid_t pid;
  78         struct rlimit rl;
  79         struct rusage ru;
  80         struct timeval after;
  81         char *ofn = NULL;
  82         FILE *out = stderr;
  83
  84         (void) setlocale(LC_NUMERIC, "");
  85         decimal_point = localeconv()->decimal_point[0];
  86
  87         aflag = hflag = lflag = pflag = 0;
  88         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  89                 switch((char)ch) {
  90                 case 'a':
  91                         aflag = 1;
  92                         break;
  93                 case 'h':
  94                         hflag = 1;
  95                         break;
  96                 case 'l':
  97                         lflag = 1;
  98                         break;
  99                 case 'o':
 100                         ofn = optarg;
 101                         break;
 102                 case 'p':
 103                         pflag = 1;
 104                         break;
 105                 case '?':
 106                 default:
 107                         usage();
 108                 }
 109
 110         if (!(argc -= optind))
 111                 exit(0);
 112         argv += optind;
 113
 114         if (ofn) {
 115                 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
 116                         err(1, "%s", ofn);
 117                 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 118         }
 119
 120         (void)gettimeofday(&before_tv, NULL);
 121         switch(pid = fork()) {
 122         case -1:                        /* error */
 123                 err(1, "time");
 124                 /* NOTREACHED */
 125         case 0:                         /* child */
 126                 execvp(*argv, argv);
 127                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 128                 /* NOTREACHED */
 129         }
 130         /* parent */
 131         (void)signal(SIGINT, SIG_IGN);
 132         (void)signal(SIGQUIT, SIG_IGN);
 133         (void)signal(SIGINFO, siginfo);
 134         while (wait4(pid, &status, 0, &ru) != pid);
 135         (void)gettimeofday(&after, NULL);
 136         if ( ! WIFEXITED(status))
 137                 warnx("command terminated abnormally");
 138         exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 139         showtime(out, &before_tv, &after, &ru);
 140         if (lflag) {
 141                 int hz = getstathz();
 142                 u_long ticks;
 143
 144                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 145                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 146
 147                 /*
 148                  * If our round-off on the tick calculation still puts us at 0,
 149                  * then always assume at least one tick.
 150                  */
 151                 if (ticks == 0)
 152                         ticks = 1;
 153
 154                 fprintf(out, "%10ld  %s\n",
 155                         ru.ru_maxrss, "maximum resident set size");
 156                 fprintf(out, "%10ld  %s\n",
 157                         ru.ru_ixrss / ticks, "average shared memory size");
 158                 fprintf(out, "%10ld  %s\n",
 159                         ru.ru_idrss / ticks, "average unshared data size");
 160                 fprintf(out, "%10ld  %s\n",
 161                         ru.ru_isrss / ticks, "average unshared stack size");
 162                 fprintf(out, "%10ld  %s\n",
 163                         ru.ru_minflt, "page reclaims");
 164                 fprintf(out, "%10ld  %s\n",
 165                         ru.ru_majflt, "page faults");
 166                 fprintf(out, "%10ld  %s\n",
 167                         ru.ru_nswap, "swaps");
 168                 fprintf(out, "%10ld  %s\n",
 169                         ru.ru_inblock, "block input operations");
 170                 fprintf(out, "%10ld  %s\n",
 171                         ru.ru_oublock, "block output operations");
 172                 fprintf(out, "%10ld  %s\n",
 173                         ru.ru_msgsnd, "messages sent");
 174                 fprintf(out, "%10ld  %s\n",
 175                         ru.ru_msgrcv, "messages received");
 176                 fprintf(out, "%10ld  %s\n",
 177                         ru.ru_nsignals, "signals received");
 178                 fprintf(out, "%10ld  %s\n",
 179                         ru.ru_nvcsw, "voluntary context switches");
 180                 fprintf(out, "%10ld  %s\n",
 181                         ru.ru_nivcsw, "involuntary context switches");
 182         }
 183         /*
 184          * If the child has exited on a signal, exit on the same
 185          * signal, too, in order to reproduce the child's exit status.
 186          * However, avoid actually dumping core from the current process.
 187          */
 188         if (exitonsig) {
 189                 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
 190                         warn("signal");
 191                 else {
 192                         rl.rlim_max = rl.rlim_cur = 0;
 193                         if (setrlimit(RLIMIT_CORE, &rl) == -1)
 194                                 warn("setrlimit");
 195                         kill(getpid(), exitonsig);
 196                 }
 197         }
 198         exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 199 }
 200
 201 static void
 202 usage(void)
 203 {
 204         fprintf(stderr,
 205             "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
 206         exit(1);
 207 }
 208
 209 /*
 210  * Return the frequency of the kernel's statistics clock.
 211  */
 212 static int
 213 getstathz(void)
 214 {
 215         int mib[2];
 216         size_t size;
 217         struct clockinfo clockrate;
 218
 219         mib[0] = CTL_KERN;
 220         mib[1] = KERN_CLOCKRATE;
 221         size = sizeof clockrate;
 222         if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
 223                 err(1, "sysctl kern.clockrate");
 224         return clockrate.stathz;
 225 }
 226
 227 static void
 228 humantime(FILE *out, long sec, long usec)
 229 {
 230         long days, hrs, mins;
 231
 232         days = sec / (60L * 60 * 24);
 233         sec %= (60L * 60 * 24);
 234         hrs = sec / (60L * 60);
 235         sec %= (60L * 60);
 236         mins = sec / 60;
 237         sec %= 60;
 238
 239         fprintf(out, "\t");
 240         if (days)
 241                 fprintf(out, "%ldd", days);
 242         if (hrs)
 243                 fprintf(out, "%ldh", hrs);
 244         if (mins)
 245                 fprintf(out, "%ldm", mins);
 246         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 247 }
 248
 249 static void
 250 showtime(FILE *out, struct timeval *before, struct timeval *after,
 251     struct rusage *ru)
 252 {
 253
 254         after->tv_sec -= before->tv_sec;
 255         after->tv_usec -= before->tv_usec;
 256         if (after->tv_usec < 0)
 257                 after->tv_sec--, after->tv_usec += 1000000;
 258
 259         if (pflag) {
 260                 /* POSIX wants output that must look like
 261                 "real %f\nuser %f\nsys %f\n" and requires
 262                 at least two digits after the radix. */
 263                 fprintf(out, "real %jd%c%02ld\n",
 264                         (intmax_t)after->tv_sec, decimal_point,
 265                         after->tv_usec/10000);
 266                 fprintf(out, "user %jd%c%02ld\n",
 267                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 268                         ru->ru_utime.tv_usec/10000);
 269                 fprintf(out, "sys %jd%c%02ld\n",
 270                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 271                         ru->ru_stime.tv_usec/10000);
 272         } else if (hflag) {
 273                 humantime(out, after->tv_sec, after->tv_usec/10000);
 274                 fprintf(out, " real\t");
 275                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 276                 fprintf(out, " user\t");
 277                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 278                 fprintf(out, " sys\n");
 279         } else {
 280                 fprintf(out, "%9jd%c%02ld real ",
 281                         (intmax_t)after->tv_sec, decimal_point,
 282                         after->tv_usec/10000);
 283                 fprintf(out, "%9jd%c%02ld user ",
 284                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 285                         ru->ru_utime.tv_usec/10000);
 286                 fprintf(out, "%9jd%c%02ld sys\n",
 287                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 288                         ru->ru_stime.tv_usec/10000);
 289         }
 290 }
 291
 292 static void
 293 siginfo(int sig __unused)
 294 {
 295         struct timeval after;
 296         struct rusage ru;
 297
 298         (void)gettimeofday(&after, NULL);
 299         getrusage(RUSAGE_CHILDREN, &ru);
 300         showtime(stdout, &before_tv, &after, &ru);
 301 }