usr.bin/time/time.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1987, 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1987, 1988, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)time.c      8.1 (Berkeley) 6/6/93";
  41 #endif
  42 static const char rcsid[] =
  43   "$FreeBSD$";
  44 #endif /* not lint */
  45
  46 #include <sys/types.h>
  47 #include <sys/resource.h>
  48 #include <sys/signal.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/time.h>
  51 #include <sys/wait.h>
  52
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <locale.h>
  56 #include <signal.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <stdint.h>
  60 #include <string.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 static int getstathz(void);
  65 static void humantime(FILE *, long, long);
  66 static void showtime(FILE *, struct timespec *, struct timespec *,
  67     struct rusage *);
  68 static void siginfo(int);
  69 static void usage(void);
  70
  71 static sig_atomic_t siginfo_recvd;
  72 static char decimal_point;
  73 static struct timespec before_ts;
  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 timespec 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 ? "ae" : "we")) == NULL)
 120                         err(1, "%s", ofn);
 121                 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 122         }
 123
 124         if (clock_gettime(CLOCK_MONOTONIC, &before_ts))
 125                 err(1, "clock_gettime");
 126         switch(pid = fork()) {
 127         case -1:                        /* error */
 128                 err(1, "time");
 129                 /* NOTREACHED */
 130         case 0:                         /* child */
 131                 execvp(*argv, argv);
 132                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 133                 /* NOTREACHED */
 134         }
 135         /* parent */
 136         (void)signal(SIGINT, SIG_IGN);
 137         (void)signal(SIGQUIT, SIG_IGN);
 138         siginfo_recvd = 0;
 139         (void)signal(SIGINFO, siginfo);
 140         (void)siginterrupt(SIGINFO, 1);
 141         while (wait4(pid, &status, 0, &ru) != pid) {
 142                 if (siginfo_recvd) {
 143                         siginfo_recvd = 0;
 144                         if (clock_gettime(CLOCK_MONOTONIC, &after))
 145                                 err(1, "clock_gettime");
 146                         getrusage(RUSAGE_CHILDREN, &ru);
 147                         showtime(stdout, &before_ts, &after, &ru);
 148                 }
 149         }
 150         if (clock_gettime(CLOCK_MONOTONIC, &after))
 151                 err(1, "clock_gettime");
 152         if ( ! WIFEXITED(status))
 153                 warnx("command terminated abnormally");
 154         exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 155         showtime(out, &before_ts, &after, &ru);
 156         if (lflag) {
 157                 int hz = getstathz();
 158                 u_long ticks;
 159
 160                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 161                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 162
 163                 /*
 164                  * If our round-off on the tick calculation still puts us at 0,
 165                  * then always assume at least one tick.
 166                  */
 167                 if (ticks == 0)
 168                         ticks = 1;
 169
 170                 fprintf(out, "%10ld  %s\n",
 171                         ru.ru_maxrss, "maximum resident set size");
 172                 fprintf(out, "%10ld  %s\n",
 173                         ru.ru_ixrss / ticks, "average shared memory size");
 174                 fprintf(out, "%10ld  %s\n",
 175                         ru.ru_idrss / ticks, "average unshared data size");
 176                 fprintf(out, "%10ld  %s\n",
 177                         ru.ru_isrss / ticks, "average unshared stack size");
 178                 fprintf(out, "%10ld  %s\n",
 179                         ru.ru_minflt, "page reclaims");
 180                 fprintf(out, "%10ld  %s\n",
 181                         ru.ru_majflt, "page faults");
 182                 fprintf(out, "%10ld  %s\n",
 183                         ru.ru_nswap, "swaps");
 184                 fprintf(out, "%10ld  %s\n",
 185                         ru.ru_inblock, "block input operations");
 186                 fprintf(out, "%10ld  %s\n",
 187                         ru.ru_oublock, "block output operations");
 188                 fprintf(out, "%10ld  %s\n",
 189                         ru.ru_msgsnd, "messages sent");
 190                 fprintf(out, "%10ld  %s\n",
 191                         ru.ru_msgrcv, "messages received");
 192                 fprintf(out, "%10ld  %s\n",
 193                         ru.ru_nsignals, "signals received");
 194                 fprintf(out, "%10ld  %s\n",
 195                         ru.ru_nvcsw, "voluntary context switches");
 196                 fprintf(out, "%10ld  %s\n",
 197                         ru.ru_nivcsw, "involuntary context switches");
 198         }
 199         /*
 200          * If the child has exited on a signal, exit on the same
 201          * signal, too, in order to reproduce the child's exit status.
 202          * However, avoid actually dumping core from the current process.
 203          */
 204         if (exitonsig) {
 205                 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
 206                         warn("signal");
 207                 else {
 208                         rl.rlim_max = rl.rlim_cur = 0;
 209                         if (setrlimit(RLIMIT_CORE, &rl) == -1)
 210                                 warn("setrlimit");
 211                         kill(getpid(), exitonsig);
 212                 }
 213         }
 214         exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 215 }
 216
 217 static void
 218 usage(void)
 219 {
 220         fprintf(stderr,
 221             "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
 222         exit(1);
 223 }
 224
 225 /*
 226  * Return the frequency of the kernel's statistics clock.
 227  */
 228 static int
 229 getstathz(void)
 230 {
 231         int mib[2];
 232         size_t size;
 233         struct clockinfo clockrate;
 234
 235         mib[0] = CTL_KERN;
 236         mib[1] = KERN_CLOCKRATE;
 237         size = sizeof clockrate;
 238         if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
 239                 err(1, "sysctl kern.clockrate");
 240         return clockrate.stathz;
 241 }
 242
 243 static void
 244 humantime(FILE *out, long sec, long centisec)
 245 {
 246         long days, hrs, mins;
 247
 248         days = sec / (60L * 60 * 24);
 249         sec %= (60L * 60 * 24);
 250         hrs = sec / (60L * 60);
 251         sec %= (60L * 60);
 252         mins = sec / 60;
 253         sec %= 60;
 254
 255         fprintf(out, "\t");
 256         if (days)
 257                 fprintf(out, "%ldd", days);
 258         if (hrs)
 259                 fprintf(out, "%ldh", hrs);
 260         if (mins)
 261                 fprintf(out, "%ldm", mins);
 262         fprintf(out, "%ld%c%02lds", sec, decimal_point, centisec);
 263 }
 264
 265 static void
 266 showtime(FILE *out, struct timespec *before, struct timespec *after,
 267     struct rusage *ru)
 268 {
 269
 270         after->tv_sec -= before->tv_sec;
 271         after->tv_nsec -= before->tv_nsec;
 272         if (after->tv_nsec < 0)
 273                 after->tv_sec--, after->tv_nsec += 1000000000;
 274
 275         if (pflag) {
 276                 /* POSIX wants output that must look like
 277                 "real %f\nuser %f\nsys %f\n" and requires
 278                 at least two digits after the radix. */
 279                 fprintf(out, "real %jd%c%02ld\n",
 280                         (intmax_t)after->tv_sec, decimal_point,
 281                         after->tv_nsec/10000000);
 282                 fprintf(out, "user %jd%c%02ld\n",
 283                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 284                         ru->ru_utime.tv_usec/10000);
 285                 fprintf(out, "sys %jd%c%02ld\n",
 286                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 287                         ru->ru_stime.tv_usec/10000);
 288         } else if (hflag) {
 289                 humantime(out, after->tv_sec, after->tv_nsec/10000000);
 290                 fprintf(out, " real\t");
 291                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 292                 fprintf(out, " user\t");
 293                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 294                 fprintf(out, " sys\n");
 295         } else {
 296                 fprintf(out, "%9jd%c%02ld real ",
 297                         (intmax_t)after->tv_sec, decimal_point,
 298                         after->tv_nsec/10000000);
 299                 fprintf(out, "%9jd%c%02ld user ",
 300                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 301                         ru->ru_utime.tv_usec/10000);
 302                 fprintf(out, "%9jd%c%02ld sys\n",
 303                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 304                         ru->ru_stime.tv_usec/10000);
 305         }
 306 }
 307
 308 static void
 309 siginfo(int sig __unused)
 310 {
 311
 312         siginfo_recvd = 1;
 313 }