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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1987, 1988, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)time.c      8.1 (Berkeley) 6/6/93";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD$";
  46 #endif /* not lint */
  47
  48 #include <sys/types.h>
  49 #include <sys/resource.h>
  50 #include <sys/signal.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/time.h>
  53 #include <sys/wait.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <locale.h>
  58 #include <signal.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <stdint.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 static int getstathz(void);
  66 static void humantime(FILE *, long, long);
  67 static void showtime(FILE *, struct timeval *, struct timeval *,
  68     struct rusage *);
  69 static void siginfo(int);
  70 static void usage(void);
  71
  72 static char decimal_point;
  73 static struct timeval before_tv;
  74 static int hflag, pflag;
  75
  76 int
  77 main(int argc, char **argv)
  78 {
  79         int aflag, ch, lflag, status;
  80         int exitonsig;
  81         pid_t pid;
  82         struct rlimit rl;
  83         struct rusage ru;
  84         struct timeval after;
  85         char *ofn = NULL;
  86         FILE *out = stderr;
  87
  88         (void) setlocale(LC_NUMERIC, "");
  89         decimal_point = localeconv()->decimal_point[0];
  90
  91         aflag = hflag = lflag = pflag = 0;
  92         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  93                 switch((char)ch) {
  94                 case 'a':
  95                         aflag = 1;
  96                         break;
  97                 case 'h':
  98                         hflag = 1;
  99                         break;
 100                 case 'l':
 101                         lflag = 1;
 102                         break;
 103                 case 'o':
 104                         ofn = optarg;
 105                         break;
 106                 case 'p':
 107                         pflag = 1;
 108                         break;
 109                 case '?':
 110                 default:
 111                         usage();
 112                 }
 113
 114         if (!(argc -= optind))
 115                 exit(0);
 116         argv += optind;
 117
 118         if (ofn) {
 119                 if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL)
 120                         err(1, "%s", ofn);
 121                 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 122         }
 123
 124         gettimeofday(&before_tv, (struct timezone *)NULL);
 125         switch(pid = fork()) {
 126         case -1:                        /* error */
 127                 err(1, "time");
 128                 /* NOTREACHED */
 129         case 0:                         /* child */
 130                 if (ofn)
 131                         fclose(out);
 132                 execvp(*argv, argv);
 133                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 134                 /* NOTREACHED */
 135         }
 136         /* parent */
 137         (void)signal(SIGINT, SIG_IGN);
 138         (void)signal(SIGQUIT, SIG_IGN);
 139         (void)signal(SIGINFO, siginfo);
 140         while (wait4(pid, &status, 0, &ru) != pid);
 141         gettimeofday(&after, (struct timezone *)NULL);
 142         if ( ! WIFEXITED(status))
 143                 warnx("command terminated abnormally");
 144         exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 145         showtime(out, &before_tv, &after, &ru);
 146         if (lflag) {
 147                 int hz = getstathz();
 148                 u_long ticks;
 149
 150                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 151                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 152
 153                 /*
 154                  * If our round-off on the tick calculation still puts us at 0,
 155                  * then always assume at least one tick.
 156                  */
 157                 if (ticks == 0)
 158                         ticks = 1;
 159
 160                 fprintf(out, "%10ld  %s\n",
 161                         ru.ru_maxrss, "maximum resident set size");
 162                 fprintf(out, "%10ld  %s\n",
 163                         ru.ru_ixrss / ticks, "average shared memory size");
 164                 fprintf(out, "%10ld  %s\n",
 165                         ru.ru_idrss / ticks, "average unshared data size");
 166                 fprintf(out, "%10ld  %s\n",
 167                         ru.ru_isrss / ticks, "average unshared stack size");
 168                 fprintf(out, "%10ld  %s\n",
 169                         ru.ru_minflt, "page reclaims");
 170                 fprintf(out, "%10ld  %s\n",
 171                         ru.ru_majflt, "page faults");
 172                 fprintf(out, "%10ld  %s\n",
 173                         ru.ru_nswap, "swaps");
 174                 fprintf(out, "%10ld  %s\n",
 175                         ru.ru_inblock, "block input operations");
 176                 fprintf(out, "%10ld  %s\n",
 177                         ru.ru_oublock, "block output operations");
 178                 fprintf(out, "%10ld  %s\n",
 179                         ru.ru_msgsnd, "messages sent");
 180                 fprintf(out, "%10ld  %s\n",
 181                         ru.ru_msgrcv, "messages received");
 182                 fprintf(out, "%10ld  %s\n",
 183                         ru.ru_nsignals, "signals received");
 184                 fprintf(out, "%10ld  %s\n",
 185                         ru.ru_nvcsw, "voluntary context switches");
 186                 fprintf(out, "%10ld  %s\n",
 187                         ru.ru_nivcsw, "involuntary context switches");
 188         }
 189         /*
 190          * If the child has exited on a signal, exit on the same
 191          * signal, too, in order to reproduce the child's exit status.
 192          * However, avoid actually dumping core from the current process.
 193          */
 194         if (exitonsig) {
 195                 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
 196                         warn("signal");
 197                 else {
 198                         rl.rlim_max = rl.rlim_cur = 0;
 199                         if (setrlimit(RLIMIT_CORE, &rl) == -1)
 200                                 warn("setrlimit");
 201                         kill(getpid(), exitonsig);
 202                 }
 203         }
 204         exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 205 }
 206
 207 static void
 208 usage(void)
 209 {
 210         fprintf(stderr,
 211             "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
 212         exit(1);
 213 }
 214
 215 /*
 216  * Return the frequency of the kernel's statistics clock.
 217  */
 218 static int
 219 getstathz(void)
 220 {
 221         int mib[2];
 222         size_t size;
 223         struct clockinfo clockrate;
 224
 225         mib[0] = CTL_KERN;
 226         mib[1] = KERN_CLOCKRATE;
 227         size = sizeof clockrate;
 228         if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
 229                 err(1, "sysctl kern.clockrate");
 230         return clockrate.stathz;
 231 }
 232
 233 static void
 234 humantime(FILE *out, long sec, long usec)
 235 {
 236         long days, hrs, mins;
 237
 238         days = sec / (60L * 60 * 24);
 239         sec %= (60L * 60 * 24);
 240         hrs = sec / (60L * 60);
 241         sec %= (60L * 60);
 242         mins = sec / 60;
 243         sec %= 60;
 244
 245         fprintf(out, "\t");
 246         if (days)
 247                 fprintf(out, "%ldd", days);
 248         if (hrs)
 249                 fprintf(out, "%ldh", hrs);
 250         if (mins)
 251                 fprintf(out, "%ldm", mins);
 252         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 253 }
 254
 255 static void
 256 showtime(FILE *out, struct timeval *before, struct timeval *after,
 257     struct rusage *ru)
 258 {
 259
 260         after->tv_sec -= before->tv_sec;
 261         after->tv_usec -= before->tv_usec;
 262         if (after->tv_usec < 0)
 263                 after->tv_sec--, after->tv_usec += 1000000;
 264
 265         if (pflag) {
 266                 /* POSIX wants output that must look like
 267                 "real %f\nuser %f\nsys %f\n" and requires
 268                 at least two digits after the radix. */
 269                 fprintf(out, "real %jd%c%02ld\n",
 270                         (intmax_t)after->tv_sec, decimal_point,
 271                         after->tv_usec/10000);
 272                 fprintf(out, "user %jd%c%02ld\n",
 273                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 274                         ru->ru_utime.tv_usec/10000);
 275                 fprintf(out, "sys %jd%c%02ld\n",
 276                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 277                         ru->ru_stime.tv_usec/10000);
 278         } else if (hflag) {
 279                 humantime(out, after->tv_sec, after->tv_usec/10000);
 280                 fprintf(out, " real\t");
 281                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 282                 fprintf(out, " user\t");
 283                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 284                 fprintf(out, " sys\n");
 285         } else {
 286                 fprintf(out, "%9jd%c%02ld real ",
 287                         (intmax_t)after->tv_sec, decimal_point,
 288                         after->tv_usec/10000);
 289                 fprintf(out, "%9jd%c%02ld user ",
 290                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 291                         ru->ru_utime.tv_usec/10000);
 292                 fprintf(out, "%9jd%c%02ld sys\n",
 293                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 294                         ru->ru_stime.tv_usec/10000);
 295         }
 296 }
 297
 298 static void
 299 siginfo(int sig __unused)
 300 {
 301         struct timeval after;
 302         struct rusage ru;
 303
 304         gettimeofday(&after, (struct timezone *)NULL);
 305         getrusage(RUSAGE_CHILDREN, &ru);
 306         showtime(stdout, &before_tv, &after, &ru);
 307 }