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 ? "a" : "w")) == NULL)
 116                         err(1, "%s", ofn);
 117                 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 118         }
 119
 120         gettimeofday(&before_tv, (struct timezone *)NULL);
 121         switch(pid = fork()) {
 122         case -1:                        /* error */
 123                 err(1, "time");
 124                 /* NOTREACHED */
 125         case 0:                         /* child */
 126                 if (ofn)
 127                         fclose(out);
 128                 execvp(*argv, argv);
 129                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 130                 /* NOTREACHED */
 131         }
 132         /* parent */
 133         (void)signal(SIGINT, SIG_IGN);
 134         (void)signal(SIGQUIT, SIG_IGN);
 135         (void)signal(SIGINFO, siginfo);
 136         while (wait4(pid, &status, 0, &ru) != pid);
 137         gettimeofday(&after, (struct timezone *)NULL);
 138         if ( ! WIFEXITED(status))
 139                 warnx("command terminated abnormally");
 140         exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 141         showtime(out, &before_tv, &after, &ru);
 142         if (lflag) {
 143                 int hz = getstathz();
 144                 u_long ticks;
 145
 146                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 147                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 148
 149                 /*
 150                  * If our round-off on the tick calculation still puts us at 0,
 151                  * then always assume at least one tick.
 152                  */
 153                 if (ticks == 0)
 154                         ticks = 1;
 155
 156                 fprintf(out, "%10ld  %s\n",
 157                         ru.ru_maxrss, "maximum resident set size");
 158                 fprintf(out, "%10ld  %s\n",
 159                         ru.ru_ixrss / ticks, "average shared memory size");
 160                 fprintf(out, "%10ld  %s\n",
 161                         ru.ru_idrss / ticks, "average unshared data size");
 162                 fprintf(out, "%10ld  %s\n",
 163                         ru.ru_isrss / ticks, "average unshared stack size");
 164                 fprintf(out, "%10ld  %s\n",
 165                         ru.ru_minflt, "page reclaims");
 166                 fprintf(out, "%10ld  %s\n",
 167                         ru.ru_majflt, "page faults");
 168                 fprintf(out, "%10ld  %s\n",
 169                         ru.ru_nswap, "swaps");
 170                 fprintf(out, "%10ld  %s\n",
 171                         ru.ru_inblock, "block input operations");
 172                 fprintf(out, "%10ld  %s\n",
 173                         ru.ru_oublock, "block output operations");
 174                 fprintf(out, "%10ld  %s\n",
 175                         ru.ru_msgsnd, "messages sent");
 176                 fprintf(out, "%10ld  %s\n",
 177                         ru.ru_msgrcv, "messages received");
 178                 fprintf(out, "%10ld  %s\n",
 179                         ru.ru_nsignals, "signals received");
 180                 fprintf(out, "%10ld  %s\n",
 181                         ru.ru_nvcsw, "voluntary context switches");
 182                 fprintf(out, "%10ld  %s\n",
 183                         ru.ru_nivcsw, "involuntary context switches");
 184         }
 185         /*
 186          * If the child has exited on a signal, exit on the same
 187          * signal, too, in order to reproduce the child's exit status.
 188          * However, avoid actually dumping core from the current process.
 189          */
 190         if (exitonsig) {
 191                 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
 192                         warn("signal");
 193                 else {
 194                         rl.rlim_max = rl.rlim_cur = 0;
 195                         if (setrlimit(RLIMIT_CORE, &rl) == -1)
 196                                 warn("setrlimit");
 197                         kill(getpid(), exitonsig);
 198                 }
 199         }
 200         exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 201 }
 202
 203 static void
 204 usage(void)
 205 {
 206         fprintf(stderr,
 207             "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
 208         exit(1);
 209 }
 210
 211 /*
 212  * Return the frequency of the kernel's statistics clock.
 213  */
 214 static int
 215 getstathz(void)
 216 {
 217         int mib[2];
 218         size_t size;
 219         struct clockinfo clockrate;
 220
 221         mib[0] = CTL_KERN;
 222         mib[1] = KERN_CLOCKRATE;
 223         size = sizeof clockrate;
 224         if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
 225                 err(1, "sysctl kern.clockrate");
 226         return clockrate.stathz;
 227 }
 228
 229 static void
 230 humantime(FILE *out, long sec, long usec)
 231 {
 232         long days, hrs, mins;
 233
 234         days = sec / (60L * 60 * 24);
 235         sec %= (60L * 60 * 24);
 236         hrs = sec / (60L * 60);
 237         sec %= (60L * 60);
 238         mins = sec / 60;
 239         sec %= 60;
 240
 241         fprintf(out, "\t");
 242         if (days)
 243                 fprintf(out, "%ldd", days);
 244         if (hrs)
 245                 fprintf(out, "%ldh", hrs);
 246         if (mins)
 247                 fprintf(out, "%ldm", mins);
 248         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 249 }
 250
 251 static void
 252 showtime(FILE *out, struct timeval *before, struct timeval *after,
 253     struct rusage *ru)
 254 {
 255
 256         after->tv_sec -= before->tv_sec;
 257         after->tv_usec -= before->tv_usec;
 258         if (after->tv_usec < 0)
 259                 after->tv_sec--, after->tv_usec += 1000000;
 260
 261         if (pflag) {
 262                 /* POSIX wants output that must look like
 263                 "real %f\nuser %f\nsys %f\n" and requires
 264                 at least two digits after the radix. */
 265                 fprintf(out, "real %jd%c%02ld\n",
 266                         (intmax_t)after->tv_sec, decimal_point,
 267                         after->tv_usec/10000);
 268                 fprintf(out, "user %jd%c%02ld\n",
 269                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 270                         ru->ru_utime.tv_usec/10000);
 271                 fprintf(out, "sys %jd%c%02ld\n",
 272                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 273                         ru->ru_stime.tv_usec/10000);
 274         } else if (hflag) {
 275                 humantime(out, after->tv_sec, after->tv_usec/10000);
 276                 fprintf(out, " real\t");
 277                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 278                 fprintf(out, " user\t");
 279                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 280                 fprintf(out, " sys\n");
 281         } else {
 282                 fprintf(out, "%9jd%c%02ld real ",
 283                         (intmax_t)after->tv_sec, decimal_point,
 284                         after->tv_usec/10000);
 285                 fprintf(out, "%9jd%c%02ld user ",
 286                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 287                         ru->ru_utime.tv_usec/10000);
 288                 fprintf(out, "%9jd%c%02ld sys\n",
 289                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 290                         ru->ru_stime.tv_usec/10000);
 291         }
 292 }
 293
 294 static void
 295 siginfo(int sig __unused)
 296 {
 297         struct timeval after;
 298         struct rusage ru;
 299
 300         gettimeofday(&after, (struct timezone *)NULL);
 301         getrusage(RUSAGE_CHILDREN, &ru);
 302         showtime(stdout, &before_tv, &after, &ru);
 303 }