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 sig_atomic_t siginfo_recvd;
  69 static char decimal_point;
  70 static struct timeval before_tv;
  71 static int hflag, pflag;
  72
  73 int
  74 main(int argc, char **argv)
  75 {
  76         int aflag, ch, lflag, status;
  77         int exitonsig;
  78         pid_t pid;
  79         struct rlimit rl;
  80         struct rusage ru;
  81         struct timeval after;
  82         char *ofn = NULL;
  83         FILE *out = stderr;
  84
  85         (void) setlocale(LC_NUMERIC, "");
  86         decimal_point = localeconv()->decimal_point[0];
  87
  88         aflag = hflag = lflag = pflag = 0;
  89         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  90                 switch((char)ch) {
  91                 case 'a':
  92                         aflag = 1;
  93                         break;
  94                 case 'h':
  95                         hflag = 1;
  96                         break;
  97                 case 'l':
  98                         lflag = 1;
  99                         break;
 100                 case 'o':
 101                         ofn = optarg;
 102                         break;
 103                 case 'p':
 104                         pflag = 1;
 105                         break;
 106                 case '?':
 107                 default:
 108                         usage();
 109                 }
 110
 111         if (!(argc -= optind))
 112                 exit(0);
 113         argv += optind;
 114
 115         if (ofn) {
 116                 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
 117                         err(1, "%s", ofn);
 118                 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 119         }
 120
 121         (void)gettimeofday(&before_tv, NULL);
 122         switch(pid = fork()) {
 123         case -1:                        /* error */
 124                 err(1, "time");
 125                 /* NOTREACHED */
 126         case 0:                         /* child */
 127                 execvp(*argv, argv);
 128                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 129                 /* NOTREACHED */
 130         }
 131         /* parent */
 132         (void)signal(SIGINT, SIG_IGN);
 133         (void)signal(SIGQUIT, SIG_IGN);
 134         siginfo_recvd = 0;
 135         (void)signal(SIGINFO, siginfo);
 136         (void)siginterrupt(SIGINFO, 1);
 137         while (wait4(pid, &status, 0, &ru) != pid) {
 138                 if (siginfo_recvd) {
 139                         siginfo_recvd = 0;
 140                         (void)gettimeofday(&after, NULL);
 141                         getrusage(RUSAGE_CHILDREN, &ru);
 142                         showtime(stdout, &before_tv, &after, &ru);
 143                 }
 144         }
 145         (void)gettimeofday(&after, NULL);
 146         if ( ! WIFEXITED(status))
 147                 warnx("command terminated abnormally");
 148         exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 149         showtime(out, &before_tv, &after, &ru);
 150         if (lflag) {
 151                 int hz = getstathz();
 152                 u_long ticks;
 153
 154                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 155                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 156
 157                 /*
 158                  * If our round-off on the tick calculation still puts us at 0,
 159                  * then always assume at least one tick.
 160                  */
 161                 if (ticks == 0)
 162                         ticks = 1;
 163
 164                 fprintf(out, "%10ld  %s\n",
 165                         ru.ru_maxrss, "maximum resident set size");
 166                 fprintf(out, "%10ld  %s\n",
 167                         ru.ru_ixrss / ticks, "average shared memory size");
 168                 fprintf(out, "%10ld  %s\n",
 169                         ru.ru_idrss / ticks, "average unshared data size");
 170                 fprintf(out, "%10ld  %s\n",
 171                         ru.ru_isrss / ticks, "average unshared stack size");
 172                 fprintf(out, "%10ld  %s\n",
 173                         ru.ru_minflt, "page reclaims");
 174                 fprintf(out, "%10ld  %s\n",
 175                         ru.ru_majflt, "page faults");
 176                 fprintf(out, "%10ld  %s\n",
 177                         ru.ru_nswap, "swaps");
 178                 fprintf(out, "%10ld  %s\n",
 179                         ru.ru_inblock, "block input operations");
 180                 fprintf(out, "%10ld  %s\n",
 181                         ru.ru_oublock, "block output operations");
 182                 fprintf(out, "%10ld  %s\n",
 183                         ru.ru_msgsnd, "messages sent");
 184                 fprintf(out, "%10ld  %s\n",
 185                         ru.ru_msgrcv, "messages received");
 186                 fprintf(out, "%10ld  %s\n",
 187                         ru.ru_nsignals, "signals received");
 188                 fprintf(out, "%10ld  %s\n",
 189                         ru.ru_nvcsw, "voluntary context switches");
 190                 fprintf(out, "%10ld  %s\n",
 191                         ru.ru_nivcsw, "involuntary context switches");
 192         }
 193         /*
 194          * If the child has exited on a signal, exit on the same
 195          * signal, too, in order to reproduce the child's exit status.
 196          * However, avoid actually dumping core from the current process.
 197          */
 198         if (exitonsig) {
 199                 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
 200                         warn("signal");
 201                 else {
 202                         rl.rlim_max = rl.rlim_cur = 0;
 203                         if (setrlimit(RLIMIT_CORE, &rl) == -1)
 204                                 warn("setrlimit");
 205                         kill(getpid(), exitonsig);
 206                 }
 207         }
 208         exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 209 }
 210
 211 static void
 212 usage(void)
 213 {
 214         fprintf(stderr,
 215             "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
 216         exit(1);
 217 }
 218
 219 /*
 220  * Return the frequency of the kernel's statistics clock.
 221  */
 222 static int
 223 getstathz(void)
 224 {
 225         int mib[2];
 226         size_t size;
 227         struct clockinfo clockrate;
 228
 229         mib[0] = CTL_KERN;
 230         mib[1] = KERN_CLOCKRATE;
 231         size = sizeof clockrate;
 232         if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
 233                 err(1, "sysctl kern.clockrate");
 234         return clockrate.stathz;
 235 }
 236
 237 static void
 238 humantime(FILE *out, long sec, long usec)
 239 {
 240         long days, hrs, mins;
 241
 242         days = sec / (60L * 60 * 24);
 243         sec %= (60L * 60 * 24);
 244         hrs = sec / (60L * 60);
 245         sec %= (60L * 60);
 246         mins = sec / 60;
 247         sec %= 60;
 248
 249         fprintf(out, "\t");
 250         if (days)
 251                 fprintf(out, "%ldd", days);
 252         if (hrs)
 253                 fprintf(out, "%ldh", hrs);
 254         if (mins)
 255                 fprintf(out, "%ldm", mins);
 256         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 257 }
 258
 259 static void
 260 showtime(FILE *out, struct timeval *before, struct timeval *after,
 261     struct rusage *ru)
 262 {
 263
 264         after->tv_sec -= before->tv_sec;
 265         after->tv_usec -= before->tv_usec;
 266         if (after->tv_usec < 0)
 267                 after->tv_sec--, after->tv_usec += 1000000;
 268
 269         if (pflag) {
 270                 /* POSIX wants output that must look like
 271                 "real %f\nuser %f\nsys %f\n" and requires
 272                 at least two digits after the radix. */
 273                 fprintf(out, "real %jd%c%02ld\n",
 274                         (intmax_t)after->tv_sec, decimal_point,
 275                         after->tv_usec/10000);
 276                 fprintf(out, "user %jd%c%02ld\n",
 277                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 278                         ru->ru_utime.tv_usec/10000);
 279                 fprintf(out, "sys %jd%c%02ld\n",
 280                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 281                         ru->ru_stime.tv_usec/10000);
 282         } else if (hflag) {
 283                 humantime(out, after->tv_sec, after->tv_usec/10000);
 284                 fprintf(out, " real\t");
 285                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 286                 fprintf(out, " user\t");
 287                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 288                 fprintf(out, " sys\n");
 289         } else {
 290                 fprintf(out, "%9jd%c%02ld real ",
 291                         (intmax_t)after->tv_sec, decimal_point,
 292                         after->tv_usec/10000);
 293                 fprintf(out, "%9jd%c%02ld user ",
 294                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 295                         ru->ru_utime.tv_usec/10000);
 296                 fprintf(out, "%9jd%c%02ld sys\n",
 297                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 298                         ru->ru_stime.tv_usec/10000);
 299         }
 300 }
 301
 302 static void
 303 siginfo(int sig __unused)
 304 {
 305
 306         siginfo_recvd = 1;
 307 }