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 <unistd.h>
  62
  63 static int getstathz(void);
  64 static void humantime(FILE *, long, long);
  65 static void showtime(FILE *, struct timeval *, struct timeval *,
  66     struct rusage *);
  67 static void siginfo(int);
  68 static void usage(void);
  69
  70 static sig_atomic_t siginfo_recvd;
  71 static char decimal_point;
  72 static struct timeval before_tv;
  73 static int hflag, pflag;
  74
  75 int
  76 main(int argc, char **argv)
  77 {
  78         int aflag, ch, lflag, status;
  79         int exitonsig;
  80         pid_t pid;
  81         struct rlimit rl;
  82         struct rusage ru;
  83         struct timeval after;
  84         char *ofn = NULL;
  85         FILE *out = stderr;
  86
  87         (void) setlocale(LC_NUMERIC, "");
  88         decimal_point = localeconv()->decimal_point[0];
  89
  90         aflag = hflag = lflag = pflag = 0;
  91         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  92                 switch((char)ch) {
  93                 case 'a':
  94                         aflag = 1;
  95                         break;
  96                 case 'h':
  97                         hflag = 1;
  98                         break;
  99                 case 'l':
 100                         lflag = 1;
 101                         break;
 102                 case 'o':
 103                         ofn = optarg;
 104                         break;
 105                 case 'p':
 106                         pflag = 1;
 107                         break;
 108                 case '?':
 109                 default:
 110                         usage();
 111                 }
 112
 113         if (!(argc -= optind))
 114                 exit(0);
 115         argv += optind;
 116
 117         if (ofn) {
 118                 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
 119                         err(1, "%s", ofn);
 120                 setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
 121         }
 122
 123         (void)gettimeofday(&before_tv, NULL);
 124         switch(pid = fork()) {
 125         case -1:                        /* error */
 126                 err(1, "time");
 127                 /* NOTREACHED */
 128         case 0:                         /* child */
 129                 execvp(*argv, argv);
 130                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 131                 /* NOTREACHED */
 132         }
 133         /* parent */
 134         (void)signal(SIGINT, SIG_IGN);
 135         (void)signal(SIGQUIT, SIG_IGN);
 136         siginfo_recvd = 0;
 137         (void)signal(SIGINFO, siginfo);
 138         (void)siginterrupt(SIGINFO, 1);
 139         while (wait4(pid, &status, 0, &ru) != pid) {
 140                 if (siginfo_recvd) {
 141                         siginfo_recvd = 0;
 142                         (void)gettimeofday(&after, NULL);
 143                         getrusage(RUSAGE_CHILDREN, &ru);
 144                         showtime(stdout, &before_tv, &after, &ru);
 145                 }
 146         }
 147         (void)gettimeofday(&after, NULL);
 148         if ( ! WIFEXITED(status))
 149                 warnx("command terminated abnormally");
 150         exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 151         showtime(out, &before_tv, &after, &ru);
 152         if (lflag) {
 153                 int hz = getstathz();
 154                 u_long ticks;
 155
 156                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 157                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 158
 159                 /*
 160                  * If our round-off on the tick calculation still puts us at 0,
 161                  * then always assume at least one tick.
 162                  */
 163                 if (ticks == 0)
 164                         ticks = 1;
 165
 166                 fprintf(out, "%10ld  %s\n",
 167                         ru.ru_maxrss, "maximum resident set size");
 168                 fprintf(out, "%10ld  %s\n",
 169                         ru.ru_ixrss / ticks, "average shared memory size");
 170                 fprintf(out, "%10ld  %s\n",
 171                         ru.ru_idrss / ticks, "average unshared data size");
 172                 fprintf(out, "%10ld  %s\n",
 173                         ru.ru_isrss / ticks, "average unshared stack size");
 174                 fprintf(out, "%10ld  %s\n",
 175                         ru.ru_minflt, "page reclaims");
 176                 fprintf(out, "%10ld  %s\n",
 177                         ru.ru_majflt, "page faults");
 178                 fprintf(out, "%10ld  %s\n",
 179                         ru.ru_nswap, "swaps");
 180                 fprintf(out, "%10ld  %s\n",
 181                         ru.ru_inblock, "block input operations");
 182                 fprintf(out, "%10ld  %s\n",
 183                         ru.ru_oublock, "block output operations");
 184                 fprintf(out, "%10ld  %s\n",
 185                         ru.ru_msgsnd, "messages sent");
 186                 fprintf(out, "%10ld  %s\n",
 187                         ru.ru_msgrcv, "messages received");
 188                 fprintf(out, "%10ld  %s\n",
 189                         ru.ru_nsignals, "signals received");
 190                 fprintf(out, "%10ld  %s\n",
 191                         ru.ru_nvcsw, "voluntary context switches");
 192                 fprintf(out, "%10ld  %s\n",
 193                         ru.ru_nivcsw, "involuntary context switches");
 194         }
 195         /*
 196          * If the child has exited on a signal, exit on the same
 197          * signal, too, in order to reproduce the child's exit status.
 198          * However, avoid actually dumping core from the current process.
 199          */
 200         if (exitonsig) {
 201                 if (signal(exitonsig, SIG_DFL) == SIG_ERR)
 202                         warn("signal");
 203                 else {
 204                         rl.rlim_max = rl.rlim_cur = 0;
 205                         if (setrlimit(RLIMIT_CORE, &rl) == -1)
 206                                 warn("setrlimit");
 207                         kill(getpid(), exitonsig);
 208                 }
 209         }
 210         exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 211 }
 212
 213 static void
 214 usage(void)
 215 {
 216         fprintf(stderr,
 217             "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
 218         exit(1);
 219 }
 220
 221 /*
 222  * Return the frequency of the kernel's statistics clock.
 223  */
 224 static int
 225 getstathz(void)
 226 {
 227         int mib[2];
 228         size_t size;
 229         struct clockinfo clockrate;
 230
 231         mib[0] = CTL_KERN;
 232         mib[1] = KERN_CLOCKRATE;
 233         size = sizeof clockrate;
 234         if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
 235                 err(1, "sysctl kern.clockrate");
 236         return clockrate.stathz;
 237 }
 238
 239 static void
 240 humantime(FILE *out, long sec, long usec)
 241 {
 242         long days, hrs, mins;
 243
 244         days = sec / (60L * 60 * 24);
 245         sec %= (60L * 60 * 24);
 246         hrs = sec / (60L * 60);
 247         sec %= (60L * 60);
 248         mins = sec / 60;
 249         sec %= 60;
 250
 251         fprintf(out, "\t");
 252         if (days)
 253                 fprintf(out, "%ldd", days);
 254         if (hrs)
 255                 fprintf(out, "%ldh", hrs);
 256         if (mins)
 257                 fprintf(out, "%ldm", mins);
 258         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 259 }
 260
 261 static void
 262 showtime(FILE *out, struct timeval *before, struct timeval *after,
 263     struct rusage *ru)
 264 {
 265
 266         after->tv_sec -= before->tv_sec;
 267         after->tv_usec -= before->tv_usec;
 268         if (after->tv_usec < 0)
 269                 after->tv_sec--, after->tv_usec += 1000000;
 270
 271         if (pflag) {
 272                 /* POSIX wants output that must look like
 273                 "real %f\nuser %f\nsys %f\n" and requires
 274                 at least two digits after the radix. */
 275                 fprintf(out, "real %jd%c%02ld\n",
 276                         (intmax_t)after->tv_sec, decimal_point,
 277                         after->tv_usec/10000);
 278                 fprintf(out, "user %jd%c%02ld\n",
 279                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 280                         ru->ru_utime.tv_usec/10000);
 281                 fprintf(out, "sys %jd%c%02ld\n",
 282                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 283                         ru->ru_stime.tv_usec/10000);
 284         } else if (hflag) {
 285                 humantime(out, after->tv_sec, after->tv_usec/10000);
 286                 fprintf(out, " real\t");
 287                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 288                 fprintf(out, " user\t");
 289                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 290                 fprintf(out, " sys\n");
 291         } else {
 292                 fprintf(out, "%9jd%c%02ld real ",
 293                         (intmax_t)after->tv_sec, decimal_point,
 294                         after->tv_usec/10000);
 295                 fprintf(out, "%9jd%c%02ld user ",
 296                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 297                         ru->ru_utime.tv_usec/10000);
 298                 fprintf(out, "%9jd%c%02ld sys\n",
 299                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 300                         ru->ru_stime.tv_usec/10000);
 301         }
 302 }
 303
 304 static void
 305 siginfo(int sig __unused)
 306 {
 307
 308         siginfo_recvd = 1;
 309 }