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. 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  * @(#) Copyright (c) 1987, 1988, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)time.c   8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/time/time.c,v 1.14.2.5 2002/06/28 08:35:15 tjr Exp $
  32  * $DragonFly: src/usr.bin/time/time.c,v 1.11 2005/03/04 16:54:37 liamfoy Exp $
  33  */
  34
  35 #include <sys/user.h>
  36 #include <sys/time.h>
  37 #include <sys/resource.h>
  38 #include <sys/signal.h>
  39 #include <sys/sysctl.h>
  40 #include <sys/wait.h>
  41
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <kinfo.h>
  45 #include <locale.h>
  46 #include <signal.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <stdint.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 static void humantime(FILE *, long, long);
  54 static void showtime(FILE *, struct timespec *, struct timespec *,
  55     struct rusage *);
  56 static void siginfo(int);
  57
  58 static void usage(void);
  59
  60 static sig_atomic_t siginfo_recvd;
  61 static char decimal_point;
  62 struct timespec before_ts;
  63 static int hflag, pflag;
  64
  65 int
  66 main(int argc, char **argv)
  67 {
  68         pid_t pid;
  69         int aflag, ch, lflag, status;
  70         int exit_on_sig;
  71         struct timespec after;
  72         struct rusage ru;
  73         FILE *out = stderr;
  74         const char *ofn = NULL;
  75
  76         setlocale(LC_NUMERIC, "");
  77         decimal_point = localeconv()->decimal_point[0];
  78
  79         aflag = hflag = lflag = pflag = 0;
  80         while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
  81                 switch (ch) {
  82                 case 'a':
  83                         aflag = 1;
  84                         break;
  85                 case 'h':
  86                         hflag = 1;
  87                         break;
  88                 case 'l':
  89                         lflag = 1;
  90                         break;
  91                 case 'o':
  92                         ofn = optarg;
  93                         break;
  94                 case 'p':
  95                         pflag = 1;
  96                         break;
  97                 default:
  98                         usage();
  99                 }
 100
 101         if (!(argc -= optind))
 102                 exit(0);
 103         argv += optind;
 104
 105         if (ofn) {
 106                 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL)
 107                         err(1, "%s", ofn);
 108                 setvbuf(out, NULL, _IONBF, (size_t)0);
 109         }
 110
 111         if (clock_gettime(CLOCK_MONOTONIC, &before_ts) == -1)
 112                 err(1, "clock_gettime failed");
 113         switch (pid = fork()) {
 114         case -1:                        /* error */
 115                 err(1, "could not fork");
 116                 /* NOTREACHED */
 117         case 0:                         /* child */
 118                 execvp(*argv, argv);
 119                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 120                 /* NOTREACHED */
 121         }
 122         /* parent */
 123         if (signal(SIGINT, SIG_IGN) == SIG_ERR)
 124                 err(1, "signal failed");
 125         if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
 126                 err(1, "signal failed");
 127         siginfo_recvd = 0;
 128         if (signal(SIGINFO, siginfo) == SIG_ERR)
 129                 err(1, "signal failed");
 130         siginterrupt(SIGINFO,1 );
 131         while (wait4(pid, &status, 0, &ru) != pid){
 132                 if (siginfo_recvd) {
 133                         siginfo_recvd = 0;
 134                         if (clock_gettime(CLOCK_MONOTONIC, &after) == -1)
 135                                 err(1, "clock_gettime failed");
 136                         getrusage(RUSAGE_CHILDREN, &ru);
 137                         showtime(stdout, &before_ts, &after, &ru);
 138                 }
 139         }
 140         if (clock_gettime(CLOCK_MONOTONIC, &after) == -1)
 141                 err(1, "clock_gettime failed");
 142         if (!WIFEXITED(status))
 143                 warnx("command terminated abnormally");
 144         exit_on_sig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
 145         showtime(out, &before_ts, &after, &ru);
 146         if (lflag) {
 147                 int hz;
 148                 u_long ticks;
 149
 150                 if (kinfo_get_sched_stathz(&hz))
 151                         err(1, "kinfo_get_sched_stathz");
 152                 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
 153                      hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;
 154
 155                 /*
 156                  * If our round-off on the tick calculation still puts us at 0,
 157                  * then always assume at least one tick.
 158                  */
 159                 if (ticks == 0)
 160                         ticks = 1;
 161
 162                 fprintf(out, "%10ld  %s\n",
 163                         ru.ru_maxrss, "maximum resident set size");
 164                 fprintf(out, "%10ld  %s\n",
 165                         ru.ru_ixrss / ticks, "average shared memory size");
 166                 fprintf(out, "%10ld  %s\n",
 167                         ru.ru_idrss / ticks, "average unshared data size");
 168                 fprintf(out, "%10ld  %s\n",
 169                         ru.ru_isrss / ticks, "average unshared stack size");
 170                 fprintf(out, "%10ld  %s\n",
 171                         ru.ru_minflt, "page reclaims");
 172                 fprintf(out, "%10ld  %s\n",
 173                         ru.ru_majflt, "page faults");
 174                 fprintf(out, "%10ld  %s\n",
 175                         ru.ru_nswap, "swaps");
 176                 fprintf(out, "%10ld  %s\n",
 177                         ru.ru_inblock, "block input operations");
 178                 fprintf(out, "%10ld  %s\n",
 179                         ru.ru_oublock, "block output operations");
 180                 fprintf(out, "%10ld  %s\n",
 181                         ru.ru_msgsnd, "messages sent");
 182                 fprintf(out, "%10ld  %s\n",
 183                         ru.ru_msgrcv, "messages received");
 184                 fprintf(out, "%10ld  %s\n",
 185                         ru.ru_nsignals, "signals received");
 186                 fprintf(out, "%10ld  %s\n",
 187                         ru.ru_nvcsw, "voluntary context switches");
 188                 fprintf(out, "%10ld  %s\n",
 189                         ru.ru_nivcsw, "involuntary context switches");
 190         }
 191         /*
 192          * If the child has exited on a signal, exit on the same
 193          * signal, too, in order to reproduce the child's exit
 194          * status.  However, avoid actually dumping core from
 195          * current process.
 196          */
 197         if (exit_on_sig) {
 198                 if (signal(exit_on_sig, SIG_DFL) == SIG_ERR)
 199                         warn("signal failed");
 200                 else
 201                         kill(getpid(), exit_on_sig);
 202         }
 203         exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
 204 }
 205
 206 static void
 207 usage(void)
 208 {
 209         fprintf(stderr,
 210             "usage: time [-al] [-h|-p] [-o file] utility [argument ...]\n");
 211         exit(1);
 212 }
 213
 214 static void
 215 humantime(FILE *out, long sec, long usec)
 216 {
 217         long days, hrs, mins;
 218
 219         days = sec / (60L * 60 * 24);
 220         sec %= (60L * 60 * 24);
 221         hrs = sec / (60L * 60);
 222         sec %= (60L * 60);
 223         mins = sec / 60;
 224         sec %= 60;
 225
 226         fprintf(out, "\t");
 227         if (days)
 228                 fprintf(out, "%ldd", days);
 229         if (hrs)
 230                 fprintf(out, "%ldh", hrs);
 231         if (mins)
 232                 fprintf(out, "%ldm", mins);
 233         fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
 234 }
 235
 236 static void
 237 showtime(FILE *out, struct timespec *before, struct timespec *after,
 238     struct rusage *ru)
 239 {
 240
 241         after->tv_sec -= before->tv_sec;
 242         after->tv_nsec -= before->tv_nsec;
 243         if (after->tv_nsec < 0)
 244                 after->tv_sec--, after->tv_nsec += 1000000000L;
 245
 246         if (pflag) {
 247                 /* POSIX wants output that must look like
 248                 "real %f\nuser %f\nsys %f\n" and requires
 249                 at least two digits after the radix. */
 250                 fprintf(out, "real %jd%c%02ld\n",
 251                         (intmax_t)after->tv_sec, decimal_point,
 252                         after->tv_nsec/10000000L);
 253                 fprintf(out, "user %jd%c%02ld\n",
 254                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 255                         ru->ru_utime.tv_usec/10000);
 256                 fprintf(out, "sys %jd%c%02ld\n",
 257                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 258                         ru->ru_stime.tv_usec/10000);
 259         } else if (hflag) {
 260                 humantime(out, after->tv_sec, after->tv_nsec/10000000);
 261                 fprintf(out, " real\t");
 262                 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
 263                 fprintf(out, " user\t");
 264                 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
 265                 fprintf(out, " sys\n");
 266         } else {
 267                 fprintf(out, "%9jd%c%02ld real ",
 268                         (intmax_t)after->tv_sec, decimal_point,
 269                         after->tv_nsec/10000000);
 270                 fprintf(out, "%9jd%c%02ld user ",
 271                         (intmax_t)ru->ru_utime.tv_sec, decimal_point,
 272                         ru->ru_utime.tv_usec/10000);
 273                 fprintf(out, "%9jd%c%02ld sys\n",
 274                         (intmax_t)ru->ru_stime.tv_sec, decimal_point,
 275                         ru->ru_stime.tv_usec/10000);
 276         }
 277 }
 278
 279 static void
 280 siginfo(int sig __unused)
 281 {
 282         siginfo_recvd = 1;
 283 }