sbin/sysctl/sysctl.c

   1 /*
   2  * Copyright (c) 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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)from: sysctl.c   8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/sbin/sysctl/sysctl.c,v 1.25.2.11 2003/05/01 22:48:08 trhodes Exp $
  36  * $DragonFly: src/sbin/sysctl/sysctl.c,v 1.16 2007/10/02 12:57:00 hasso Exp $
  37  */
  38
  39 #ifdef __i386__
  40 #include <sys/diskslice.h>      /* used for bootdev parsing */
  41 #include <sys/reboot.h>         /* used for bootdev parsing */
  42 #endif
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/resource.h>
  47 #include <sys/sensors.h>
  48 #include <sys/param.h>
  49
  50 #include <machine/inttypes.h>
  51
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 static int      aflag, bflag, dflag, eflag, Nflag, nflag, oflag, xflag;
  61
  62 static int      oidfmt(int *, size_t, char *, u_int *);
  63 static void     parse(const char *);
  64 static int      show_var(int *, size_t);
  65 static int      sysctl_all(int *, size_t);
  66 static void     set_T_dev_t(const char *, void **, size_t *);
  67 static int      set_IK(const char *, int *);
  68
  69 static void
  70 usage(void)
  71 {
  72
  73         fprintf(stderr, "%s\n%s\n",
  74             "usage: sysctl [-bdeNnox] variable[=value] ...",
  75             "       sysctl [-bdeNnox] -a");
  76         exit(1);
  77 }
  78
  79 int
  80 main(int argc, char **argv)
  81 {
  82         int ch;
  83         setbuf(stdout,0);
  84         setbuf(stderr,0);
  85
  86         while ((ch = getopt(argc, argv, "AabdeNnowxX")) != -1) {
  87                 switch (ch) {
  88                 case 'A':
  89                         /* compatibility */
  90                         aflag = oflag = 1;
  91                         break;
  92                 case 'a':
  93                         aflag = 1;
  94                         break;
  95                 case 'b':
  96                         bflag = 1;
  97                         break;
  98                 case 'd':
  99                         dflag = 1;
 100                         break;
 101                 case 'e':
 102                         eflag = 1;
 103                         break;
 104                 case 'N':
 105                         Nflag = 1;
 106                         break;
 107                 case 'n':
 108                         nflag = 1;
 109                         break;
 110                 case 'o':
 111                         oflag = 1;
 112                         break;
 113                 case 'w':
 114                         /* compatibility */
 115                         /* ignored */
 116                         break;
 117                 case 'X':
 118                         /* compatibility */
 119                         aflag = xflag = 1;
 120                         break;
 121                 case 'x':
 122                         xflag = 1;
 123                         break;
 124                 default:
 125                         usage();
 126                 }
 127         }
 128         argc -= optind;
 129         argv += optind;
 130
 131         if (Nflag && nflag)
 132                 usage();
 133         if (aflag && argc == 0)
 134                 exit(sysctl_all(0, 0));
 135         if (argc == 0)
 136                 usage();
 137         while (argc-- > 0)
 138                 parse(*argv++);
 139         exit(0);
 140 }
 141
 142 /*
 143  * Parse a name into a MIB entry.
 144  * Lookup and print out the MIB entry if it exists.
 145  * Set a new value if requested.
 146  */
 147 static void
 148 parse(const char *string)
 149 {
 150         size_t len;
 151         int i, j;
 152         void *newval = NULL;
 153         int intval;
 154         unsigned int uintval;
 155         long longval;
 156         unsigned long ulongval;
 157         size_t newsize = 0;
 158         quad_t quadval;
 159         u_quad_t uquadval;
 160         int mib[CTL_MAXNAME];
 161         char *cp, fmt[BUFSIZ];
 162         const char *name;
 163         char *name_allocated = NULL;
 164         u_int kind;
 165
 166         if ((cp = strchr(string, '=')) != NULL) {
 167                 if ((name_allocated = malloc(cp - string + 1)) == NULL)
 168                         err(1, "malloc failed");
 169                 strlcpy(name_allocated, string, cp - string + 1);
 170                 name = name_allocated;
 171
 172                 while (isspace(*++cp))
 173                         ;
 174
 175                 newval = cp;
 176                 newsize = strlen(cp);
 177         } else {
 178                 name = string;
 179         }
 180
 181         len = CTL_MAXNAME;
 182         if (sysctlnametomib(name, mib, &len) < 0) {
 183                 if (errno == ENOENT) {
 184                         errx(1, "unknown oid '%s'", name);
 185                 } else {
 186                         err(1, "sysctlnametomib(\"%s\")", name);
 187                 }
 188         }
 189
 190         if (oidfmt(mib, len, fmt, &kind))
 191                 err(1, "couldn't find format of oid '%s'", name);
 192
 193         if (newval == NULL) {
 194                 if ((kind & CTLTYPE) == CTLTYPE_NODE) {
 195                         sysctl_all(mib, len);
 196                 } else {
 197                         i = show_var(mib, len);
 198                         if (!i && !bflag)
 199                                 putchar('\n');
 200                 }
 201         } else {
 202                 if ((kind & CTLTYPE) == CTLTYPE_NODE)
 203                         errx(1, "oid '%s' isn't a leaf node", name);
 204
 205                 if (!(kind&CTLFLAG_WR))
 206                         errx(1, "oid '%s' is read only", name);
 207
 208                 switch (kind & CTLTYPE) {
 209                         case CTLTYPE_INT:
 210                                 if (!strcmp(fmt, "IK") == 0) {
 211                                         if (!set_IK(newval, &intval))
 212                                                 errx(1, "invalid value '%s'",
 213                                                     (char *)newval);
 214                                 } else
 215                                         intval = (int) strtol(newval, NULL, 0);
 216                                 newval = &intval;
 217                                 newsize = sizeof(intval);
 218                                 break;
 219                         case CTLTYPE_UINT:
 220                                 uintval = (int) strtoul(newval, NULL, 0);
 221                                 newval = &uintval;
 222                                 newsize = sizeof uintval;
 223                                 break;
 224                         case CTLTYPE_LONG:
 225                                 longval = strtol(newval, NULL, 0);
 226                                 newval = &longval;
 227                                 newsize = sizeof longval;
 228                                 break;
 229                         case CTLTYPE_ULONG:
 230                                 ulongval = strtoul(newval, NULL, 0);
 231                                 newval = &ulongval;
 232                                 newsize = sizeof ulongval;
 233                                 break;
 234                         case CTLTYPE_STRING:
 235                                 break;
 236                         case CTLTYPE_QUAD:
 237                                 quadval = strtoq(newval, NULL, 0);
 238                                 newval = &quadval;
 239                                 newsize = sizeof(quadval);
 240                                 break;
 241                         case CTLTYPE_UQUAD:
 242                                 uquadval = strtouq(newval, NULL, 0);
 243                                 newval = &quadval;
 244                                 newsize = sizeof(quadval);
 245                                 break;
 246                         case CTLTYPE_OPAQUE:
 247                                 if (strcmp(fmt, "T,dev_t") == 0 ||
 248                                     strcmp(fmt, "T,udev_t") == 0
 249                                 ) {
 250                                         set_T_dev_t((char*)newval, &newval,
 251                                                     &newsize);
 252                                         break;
 253                                 }
 254                                 /* FALLTHROUGH */
 255                         default:
 256                                 errx(1, "oid '%s' is type %d,"
 257                                         " cannot set that", name,
 258                                         kind & CTLTYPE);
 259                 }
 260
 261                 i = show_var(mib, len);
 262                 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) {
 263                         if (!i && !bflag)
 264                                 putchar('\n');
 265                         switch (errno) {
 266                         case EOPNOTSUPP:
 267                                 errx(1, "%s: value is not available",
 268                                         string);
 269                         case ENOTDIR:
 270                                 errx(1, "%s: specification is incomplete",
 271                                         string);
 272                         case ENOMEM:
 273                                 errx(1, "%s: type is unknown to this program",
 274                                         string);
 275                         default:
 276                                 warn("%s", string);
 277                                 return;
 278                         }
 279                 }
 280                 if (!bflag)
 281                         printf(" -> ");
 282                 i = nflag;
 283                 nflag = 1;
 284                 j = show_var(mib, len);
 285                 if (!j && !bflag)
 286                         putchar('\n');
 287                 nflag = i;
 288         }
 289
 290         if (name_allocated != NULL)
 291                 free(name_allocated);
 292 }
 293
 294 /* These functions will dump out various interesting structures. */
 295
 296 static int
 297 S_clockinfo(int l2, void *p)
 298 {
 299         struct clockinfo *ci = (struct clockinfo*)p;
 300         if (l2 != sizeof(*ci))
 301                 err(1, "S_clockinfo %d != %zu", l2, sizeof(*ci));
 302         printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }",
 303                 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz);
 304         return (0);
 305 }
 306
 307 static int
 308 S_loadavg(int l2, void *p)
 309 {
 310         struct loadavg *tv = (struct loadavg*)p;
 311
 312         if (l2 != sizeof(*tv))
 313                 err(1, "S_loadavg %d != %zu", l2, sizeof(*tv));
 314
 315         printf("{ %.2f %.2f %.2f }",
 316                 (double)tv->ldavg[0]/(double)tv->fscale,
 317                 (double)tv->ldavg[1]/(double)tv->fscale,
 318                 (double)tv->ldavg[2]/(double)tv->fscale);
 319         return (0);
 320 }
 321
 322 static int
 323 S_timespec(int l2, void *p)
 324 {
 325         struct timespec *ts = (struct timespec*)p;
 326         time_t tv_sec;
 327         char *p1, *p2;
 328
 329         if (l2 != sizeof(*ts))
 330                 err(1, "S_timespec %d != %zu", l2, sizeof(*ts));
 331         printf("{ sec = %ld, nsec = %ld } ",
 332                 ts->tv_sec, ts->tv_nsec);
 333         tv_sec = ts->tv_sec;
 334         p1 = strdup(ctime(&tv_sec));
 335         for (p2=p1; *p2 ; p2++)
 336                 if (*p2 == '\n')
 337                         *p2 = '\0';
 338         fputs(p1, stdout);
 339         return (0);
 340 }
 341
 342 static int
 343 S_timeval(int l2, void *p)
 344 {
 345         struct timeval *tv = (struct timeval*)p;
 346         time_t tv_sec;
 347         char *p1, *p2;
 348
 349         if (l2 != sizeof(*tv))
 350                 err(1, "S_timeval %d != %zu", l2, sizeof(*tv));
 351         printf("{ sec = %ld, usec = %ld } ",
 352                 tv->tv_sec, tv->tv_usec);
 353         tv_sec = tv->tv_sec;
 354         p1 = strdup(ctime(&tv_sec));
 355         for (p2=p1; *p2 ; p2++)
 356                 if (*p2 == '\n')
 357                         *p2 = '\0';
 358         fputs(p1, stdout);
 359         return (0);
 360 }
 361
 362 static int
 363 S_sensor(int l2, void *p)
 364 {
 365         struct sensor *s = (struct sensor *)p;
 366
 367         if (l2 != sizeof(*s)) {
 368                 warnx("S_sensor %d != %zu", l2, sizeof(*s));
 369                 return (1);
 370         }
 371
 372         if (s->flags & SENSOR_FINVALID) {
 373                 /*
 374                  * XXX: with this flag, the node should be entirely ignored,
 375                  * but as the magic-based sysctl(8) is not too flexible, we
 376                  * simply have to print out that the sensor is invalid.
 377                  */
 378                 printf("invalid");
 379                 return (0);
 380         }
 381
 382         if (s->flags & SENSOR_FUNKNOWN)
 383                 printf("unknown");
 384         else {
 385                 switch (s->type) {
 386                 case SENSOR_TEMP:
 387                         printf("%.2f degC",
 388                             (s->value - 273150000) / 1000000.0);
 389                         break;
 390                 case SENSOR_FANRPM:
 391                         printf("%jd RPM", (intmax_t)s->value);
 392                         break;
 393                 case SENSOR_VOLTS_DC:
 394                         printf("%.2f VDC", s->value / 1000000.0);
 395                         break;
 396                 case SENSOR_AMPS:
 397                         printf("%.2f A", s->value / 1000000.0);
 398                         break;
 399                 case SENSOR_WATTHOUR:
 400                         printf("%.2f Wh", s->value / 1000000.0);
 401                         break;
 402                 case SENSOR_AMPHOUR:
 403                         printf("%.2f Ah", s->value / 1000000.0);
 404                         break;
 405                 case SENSOR_INDICATOR:
 406                         printf("%s", s->value ? "On" : "Off");
 407                         break;
 408                 case SENSOR_INTEGER:
 409                         printf("%jd", (intmax_t)s->value);
 410                         break;
 411                 case SENSOR_PERCENT:
 412                         printf("%.2f%%", s->value / 1000.0);
 413                         break;
 414                 case SENSOR_LUX:
 415                         printf("%.2f lx", s->value / 1000000.0);
 416                         break;
 417                 case SENSOR_DRIVE:
 418                 {
 419                         const char *name;
 420
 421                         switch (s->value) {
 422                         case SENSOR_DRIVE_EMPTY:
 423                                 name = "empty";
 424                                 break;
 425                         case SENSOR_DRIVE_READY:
 426                                 name = "ready";
 427                                 break;
 428                         case SENSOR_DRIVE_POWERUP:
 429                                 name = "powering up";
 430                                 break;
 431                         case SENSOR_DRIVE_ONLINE:
 432                                 name = "online";
 433                                 break;
 434                         case SENSOR_DRIVE_IDLE:
 435                                 name = "idle";
 436                                 break;
 437                         case SENSOR_DRIVE_ACTIVE:
 438                                 name = "active";
 439                                 break;
 440                         case SENSOR_DRIVE_REBUILD:
 441                                 name = "rebuilding";
 442                                 break;
 443                         case SENSOR_DRIVE_POWERDOWN:
 444                                 name = "powering down";
 445                                 break;
 446                         case SENSOR_DRIVE_FAIL:
 447                                 name = "failed";
 448                                 break;
 449                         case SENSOR_DRIVE_PFAIL:
 450                                 name = "degraded";
 451                                 break;
 452                         default:
 453                                 name = "unknown";
 454                                 break;
 455                         }
 456                         printf(name);
 457                         break;
 458                 }
 459                 case SENSOR_TIMEDELTA:
 460                         printf("%.6f secs", s->value / 1000000000.0);
 461                         break;
 462                 default:
 463                         printf("unknown");
 464                 }
 465         }
 466
 467         if (s->desc[0] != '\0')
 468                 printf(" (%s)", s->desc);
 469
 470         switch (s->status) {
 471         case SENSOR_S_UNSPEC:
 472                 break;
 473         case SENSOR_S_OK:
 474                 printf(", OK");
 475                 break;
 476         case SENSOR_S_WARN:
 477                 printf(", WARNING");
 478                 break;
 479         case SENSOR_S_CRIT:
 480                 printf(", CRITICAL");
 481                 break;
 482         case SENSOR_S_UNKNOWN:
 483                 printf(", UNKNOWN");
 484                 break;
 485         }
 486
 487         if (s->tv.tv_sec) {
 488                 time_t t = s->tv.tv_sec;
 489                 char ct[26];
 490
 491                 ctime_r(&t, ct);
 492                 ct[19] = '\0';
 493                 printf(", %s.%03ld", ct, s->tv.tv_usec / 1000);
 494         }
 495
 496         return (0);
 497 }
 498
 499 static int
 500 T_dev_t(int l2, void *p)
 501 {
 502         dev_t *d = (dev_t *)p;
 503         if (l2 != sizeof(*d))
 504                 err(1, "T_dev_T %d != %zu", l2, sizeof(*d));
 505         if ((int)(*d) != -1) {
 506                 if (minor(*d) > 255 || minor(*d) < 0)
 507                         printf("{ major = %d, minor = 0x%x }",
 508                                 major(*d), minor(*d));
 509                 else
 510                         printf("{ major = %d, minor = %d }",
 511                                 major(*d), minor(*d));
 512         }
 513         return (0);
 514 }
 515
 516 static void
 517 set_T_dev_t(const char *path, void **val, size_t *size)
 518 {
 519         static struct stat statb;
 520
 521         if (strcmp(path, "none") && strcmp(path, "off")) {
 522                 int rc = stat (path, &statb);
 523                 if (rc) {
 524                         err(1, "cannot stat %s", path);
 525                 }
 526
 527                 if (!S_ISCHR(statb.st_mode)) {
 528                         errx(1, "must specify a device special file.");
 529                 }
 530         } else {
 531                 statb.st_rdev = NODEV;
 532         }
 533         *val = (char*) &statb.st_rdev;
 534         *size = sizeof statb.st_rdev;
 535 }
 536
 537 static int
 538 set_IK(const char *str, int *val)
 539 {
 540         float temp;
 541         int len, kelv;
 542         const char *p;
 543         char *endptr;
 544
 545         if ((len = strlen(str)) == 0)
 546                 return (0);
 547         p = &str[len - 1];
 548         if (*p == 'C' || *p == 'F') {
 549                 temp = strtof(str, &endptr);
 550                 if (endptr == str || endptr != p)
 551                         return 0;
 552                 if (*p == 'F')
 553                         temp = (temp - 32) * 5 / 9;
 554                 kelv = temp * 10 + 2732;
 555         } else {
 556                 kelv = (int)strtol(str, &endptr, 10);
 557                 if (endptr == str || *endptr != '\0')
 558                         return 0;
 559         }
 560         *val = kelv;
 561         return 1;
 562 }
 563
 564 /*
 565  * These functions uses a presently undocumented interface to the kernel
 566  * to walk the tree and get the type so it can print the value.
 567  * This interface is under work and consideration, and should probably
 568  * be killed with a big axe by the first person who can find the time.
 569  * (be aware though, that the proper interface isn't as obvious as it
 570  * may seem, there are various conflicting requirements.
 571  */
 572
 573 static int
 574 oidfmt(int *oid, size_t len, char *fmt, u_int *kind)
 575 {
 576         int qoid[CTL_MAXNAME+2];
 577         u_char buf[BUFSIZ];
 578         int i;
 579         size_t j;
 580
 581         qoid[0] = 0;
 582         qoid[1] = 4;
 583         memcpy(qoid + 2, oid, len * sizeof(int));
 584
 585         j = sizeof(buf);
 586         i = sysctl(qoid, len + 2, buf, &j, 0, 0);
 587         if (i)
 588                 err(1, "sysctl fmt %d %zu %d", i, j, errno);
 589
 590         if (kind)
 591                 *kind = *(u_int *)buf;
 592
 593         if (fmt)
 594                 strcpy(fmt, (char *)(buf + sizeof(u_int)));
 595         return 0;
 596 }
 597
 598 #ifdef __i386__
 599 /*
 600  * Code to map a bootdev major number into a suitable device name.
 601  * Major numbers are mapped into names as in boot2.c
 602  */
 603 struct _foo {
 604         int majdev;
 605         const char *name;
 606 } maj2name[] = {
 607         { 30,   "ad" },
 608         { 0,    "wd" },
 609         { 1,    "wfd" },
 610         { 2,    "fd" },
 611         { 4,    "da" },
 612         { -1,   NULL }  /* terminator */
 613 };
 614
 615 static int
 616 machdep_bootdev(u_long value)
 617 {
 618         int majdev, unit, slice, part;
 619         struct _foo *p;
 620
 621         if ((value & B_MAGICMASK) != B_DEVMAGIC) {
 622                 printf("invalid (0x%08lx)", value);
 623                 return 0;
 624         }
 625         majdev = B_TYPE(value);
 626         unit = B_UNIT(value);
 627         slice = B_SLICE(value);
 628         part = B_PARTITION(value);
 629         if (majdev == 2) {      /* floppy, as known to the boot block... */
 630                 printf("/dev/fd%d", unit);
 631                 return 0;
 632         }
 633         for (p = maj2name; p->name != NULL && p->majdev != majdev ; p++) ;
 634         if (p->name != NULL) {  /* found */
 635                 if (slice == WHOLE_DISK_SLICE)
 636                         printf("/dev/%s%d%c", p->name, unit, part);
 637                 else
 638                         printf("/dev/%s%ds%d%c",
 639                             p->name, unit, slice - BASE_SLICE + 1, part + 'a');
 640         } else
 641                 printf("unknown (major %d unit %d slice %d part %d)",
 642                         majdev, unit, slice, part);
 643         return 0;
 644 }
 645 #endif
 646
 647 /*
 648  * This formats and outputs the value of one variable
 649  *
 650  * Returns zero if anything was actually output.
 651  * Returns one if didn't know what to do with this.
 652  * Return minus one if we had errors.
 653  */
 654
 655 static int
 656 show_var(int *oid, size_t nlen)
 657 {
 658         u_char buf[BUFSIZ], *val, *p, *nul;
 659         char name[BUFSIZ], *fmt;
 660         const char *sep, *spacer;
 661         int qoid[CTL_MAXNAME+2];
 662         int i;
 663         size_t j, len;
 664         u_int kind;
 665         int (*func)(int, void *);
 666
 667         qoid[0] = 0;
 668         memcpy(qoid + 2, oid, nlen * sizeof(int));
 669
 670         qoid[1] = 1;
 671         j = sizeof(name);
 672         i = sysctl(qoid, nlen + 2, name, &j, 0, 0);
 673         if (i || !j)
 674                 err(1, "sysctl name %d %zu %d", i, j, errno);
 675
 676         if (Nflag) {
 677                 printf("%s", name);
 678                 return (0);
 679         }
 680
 681         if (eflag)
 682                 sep = "=";
 683         else
 684                 sep = ": ";
 685
 686         if (dflag) {    /* just print description */
 687                 qoid[1] = 5;
 688                 j = sizeof(buf);
 689                 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0);
 690                 if (!nflag)
 691                         printf("%s%s", name, sep);
 692                 printf("%s", buf);
 693                 return(0);
 694         }
 695         /* find an estimate of how much we need for this var */
 696         j = 0;
 697         i = sysctl(oid, nlen, 0, &j, 0, 0);
 698         j += j; /* we want to be sure :-) */
 699
 700         val = alloca(j + 1);
 701         len = j;
 702         i = sysctl(oid, nlen, val, &len, 0, 0);
 703         if (i || !len)
 704                 return (1);
 705
 706         if (bflag) {
 707                 fwrite(val, 1, len, stdout);
 708                 return (0);
 709         }
 710
 711         val[len] = '\0';
 712         fmt = buf;
 713         oidfmt(oid, nlen, fmt, &kind);
 714         p = val;
 715         switch (*fmt) {
 716         case 'A':
 717                 if (!nflag)
 718                         printf("%s%s", name, sep);
 719                 nul = memchr(p, '\0', len);
 720                 fwrite(p, nul == NULL ? len : nul - p, 1, stdout);
 721                 return (0);
 722
 723         case 'I':
 724                 if (!nflag)
 725                         printf("%s%s", name, sep);
 726                 fmt++;
 727                 spacer = "";
 728                 while (len >= sizeof(int)) {
 729                         if(*fmt == 'U')
 730                                 printf("%s%u", spacer, *(unsigned int *)p);
 731                         else if (*fmt == 'K' && *(int *)p >= 0)
 732                                 printf("%s%.1fC", spacer, (*(int *)p - 2732) / 10.0);
 733                         else
 734                                 printf("%s%d", spacer, *(int *)p);
 735                         spacer = " ";
 736                         len -= sizeof(int);
 737                         p += sizeof(int);
 738                 }
 739                 return (0);
 740
 741         case 'L':
 742                 if (!nflag)
 743                         printf("%s%s", name, sep);
 744                 fmt++;
 745 #ifdef __i386__
 746                 if (!strcmp(name, "machdep.guessed_bootdev"))
 747                         return machdep_bootdev(*(unsigned long *)p);
 748 #endif
 749                 spacer = "";
 750                 while (len >= sizeof(long)) {
 751                         if(*fmt == 'U')
 752                                 printf("%s%lu", spacer, *(unsigned long *)p);
 753                         else
 754                                 printf("%s%ld", spacer, *(long *)p);
 755                         spacer = " ";
 756                         len -= sizeof(long);
 757                         p += sizeof(long);
 758                 }
 759                 return (0);
 760
 761         case 'P':
 762                 if (!nflag)
 763                         printf("%s%s", name, sep);
 764                 printf("%p", *(void **)p);
 765                 return (0);
 766
 767         case 'Q':
 768                 if (!nflag)
 769                         printf("%s%s", name, sep);
 770                 fmt++;
 771                 spacer = "";
 772                 while (len >= sizeof(quad_t)) {
 773                         if(*fmt == 'U') {
 774                                 printf("%s%ju",
 775                                        spacer, (uintmax_t)*(u_quad_t *)p);
 776                         } else {
 777                                 printf("%s%jd",
 778                                        spacer, (intmax_t)*(quad_t *)p);
 779                         }
 780                         spacer = " ";
 781                         len -= sizeof(int64_t);
 782                         p += sizeof(int64_t);
 783                 }
 784                 return (0);
 785
 786         case 'T':
 787         case 'S':
 788                 if (!oflag && !xflag) {
 789                         i = 0;
 790                         if (strcmp(fmt, "S,clockinfo") == 0)
 791                                 func = S_clockinfo;
 792                         else if (strcmp(fmt, "S,timespec") == 0)
 793                                 func = S_timespec;
 794                         else if (strcmp(fmt, "S,timeval") == 0)
 795                                 func = S_timeval;
 796                         else if (strcmp(fmt, "S,loadavg") == 0)
 797                                 func = S_loadavg;
 798                         else if (strcmp(fmt, "S,sensor") == 0)
 799                                 func = S_sensor;
 800                         else if (strcmp(fmt, "T,dev_t") == 0)
 801                                 func = T_dev_t;
 802                         else if (strcmp(fmt, "T,udev_t") == 0)
 803                                 func = T_dev_t;
 804                         else
 805                                 func = NULL;
 806                         if (func) {
 807                                 if (!nflag)
 808                                         printf("%s%s", name, sep);
 809                                 return ((*func)(len, p));
 810                         }
 811                 }
 812                 /* FALL THROUGH */
 813         default:
 814                 if (!oflag && !xflag)
 815                         return (1);
 816                 if (!nflag)
 817                         printf("%s%s", name, sep);
 818                 printf("Format:%s Length:%zu Dump:0x", fmt, len);
 819                 while (len-- && (xflag || p < val + 16))
 820                         printf("%02x", *p++);
 821                 if (!xflag && len > 16)
 822                         printf("...");
 823                 return (0);
 824         }
 825         return (1);
 826 }
 827
 828 static int
 829 sysctl_all(int *oid, size_t len)
 830 {
 831         int name1[22], name2[22];
 832         int retval;
 833         size_t i, l1, l2;
 834
 835         name1[0] = 0;
 836         name1[1] = 2;
 837         l1 = 2;
 838         if (len) {
 839                 memcpy(name1+2, oid, len * sizeof(int));
 840                 l1 += len;
 841         } else {
 842                 name1[2] = 1;
 843                 l1++;
 844         }
 845         for (;;) {
 846                 l2 = sizeof(name2);
 847                 retval = sysctl(name1, l1, name2, &l2, 0, 0);
 848                 if (retval < 0) {
 849                         if (errno == ENOENT)
 850                                 return 0;
 851                         else
 852                                 err(1, "sysctl(getnext) %d %zu", retval, l2);
 853                 }
 854
 855                 l2 /= sizeof(int);
 856
 857                 if (l2 < len)
 858                         return 0;
 859
 860                 for (i = 0; i < len; i++)
 861                         if (name2[i] != oid[i])
 862                                 return 0;
 863
 864                 retval = show_var(name2, l2);
 865                 if (retval == 0 && !bflag)
 866                         putchar('\n');
 867
 868                 memcpy(name1+2, name2, l2 * sizeof(int));
 869                 l1 = 2 + l2;
 870         }
 871 }