Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_sysctl.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Mike Karels at Berkeley Software Design, Inc. 7 * 8 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD 9 * project, to make these variables more userfriendly. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 40 * $FreeBSD: releng/5.1/sys/kern/kern_sysctl.c 115391 2003-05-29 21:19:18Z mux $ 41 */ 42 43 #include "opt_compat.h" 44 #include "opt_mac.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/sysctl.h> 50 #include <sys/mac.h> 51 #include <sys/malloc.h> 52 #include <sys/proc.h> 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <sys/sx.h> 56 #include <sys/sysproto.h> 57 #include <vm/vm.h> 58 #include <vm/vm_extern.h> 59 60 static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic"); 61 static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids"); 62 static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer"); 63 64 /* 65 * Locking - this locks the sysctl tree in memory. 66 */ 67 static struct sx sysctllock; 68 69 #define SYSCTL_LOCK() sx_xlock(&sysctllock) 70 #define SYSCTL_UNLOCK() sx_xunlock(&sysctllock) 71 #define SYSCTL_INIT() sx_init(&sysctllock, "sysctl lock") 72 73 static int sysctl_root(SYSCTL_HANDLER_ARGS); 74 75 struct sysctl_oid_list sysctl__children; /* root list */ 76 77 static struct sysctl_oid * 78 sysctl_find_oidname(const char *name, struct sysctl_oid_list *list) 79 { 80 struct sysctl_oid *oidp; 81 82 SLIST_FOREACH(oidp, list, oid_link) { 83 if (strcmp(oidp->oid_name, name) == 0) { 84 return (oidp); 85 } 86 } 87 return (NULL); 88 } 89 90 /* 91 * Initialization of the MIB tree. 92 * 93 * Order by number in each list. 94 */ 95 96 void 97 sysctl_register_oid(struct sysctl_oid *oidp) 98 { 99 struct sysctl_oid_list *parent = oidp->oid_parent; 100 struct sysctl_oid *p; 101 struct sysctl_oid *q; 102 103 /* 104 * First check if another oid with the same name already 105 * exists in the parent's list. 106 */ 107 p = sysctl_find_oidname(oidp->oid_name, parent); 108 if (p != NULL) { 109 if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 110 p->oid_refcnt++; 111 return; 112 } else { 113 printf("can't re-use a leaf (%s)!\n", p->oid_name); 114 return; 115 } 116 } 117 /* 118 * If this oid has a number OID_AUTO, give it a number which 119 * is greater than any current oid. 120 * NOTE: DO NOT change the starting value here, change it in 121 * <sys/sysctl.h>, and make sure it is at least 256 to 122 * accomodate e.g. net.inet.raw as a static sysctl node. 123 */ 124 if (oidp->oid_number == OID_AUTO) { 125 static int newoid = CTL_AUTO_START; 126 127 oidp->oid_number = newoid++; 128 if (newoid == 0x7fffffff) 129 panic("out of oids"); 130 } 131 #if 0 132 else if (oidp->oid_number >= CTL_AUTO_START) { 133 /* do not panic; this happens when unregistering sysctl sets */ 134 printf("static sysctl oid too high: %d", oidp->oid_number); 135 } 136 #endif 137 138 /* 139 * Insert the oid into the parent's list in order. 140 */ 141 q = NULL; 142 SLIST_FOREACH(p, parent, oid_link) { 143 if (oidp->oid_number < p->oid_number) 144 break; 145 q = p; 146 } 147 if (q) 148 SLIST_INSERT_AFTER(q, oidp, oid_link); 149 else 150 SLIST_INSERT_HEAD(parent, oidp, oid_link); 151 } 152 153 void 154 sysctl_unregister_oid(struct sysctl_oid *oidp) 155 { 156 struct sysctl_oid *p; 157 int error; 158 159 error = ENOENT; 160 if (oidp->oid_number == OID_AUTO) { 161 error = EINVAL; 162 } else { 163 SLIST_FOREACH(p, oidp->oid_parent, oid_link) { 164 if (p == oidp) { 165 SLIST_REMOVE(oidp->oid_parent, oidp, 166 sysctl_oid, oid_link); 167 error = 0; 168 break; 169 } 170 } 171 } 172 173 /* 174 * This can happen when a module fails to register and is 175 * being unloaded afterwards. It should not be a panic() 176 * for normal use. 177 */ 178 if (error) 179 printf("%s: failed to unregister sysctl\n", __func__); 180 } 181 182 /* Initialize a new context to keep track of dynamically added sysctls. */ 183 int 184 sysctl_ctx_init(struct sysctl_ctx_list *c) 185 { 186 187 if (c == NULL) { 188 return (EINVAL); 189 } 190 TAILQ_INIT(c); 191 return (0); 192 } 193 194 /* Free the context, and destroy all dynamic oids registered in this context */ 195 int 196 sysctl_ctx_free(struct sysctl_ctx_list *clist) 197 { 198 struct sysctl_ctx_entry *e, *e1; 199 int error; 200 201 error = 0; 202 /* 203 * First perform a "dry run" to check if it's ok to remove oids. 204 * XXX FIXME 205 * XXX This algorithm is a hack. But I don't know any 206 * XXX better solution for now... 207 */ 208 TAILQ_FOREACH(e, clist, link) { 209 error = sysctl_remove_oid(e->entry, 0, 0); 210 if (error) 211 break; 212 } 213 /* 214 * Restore deregistered entries, either from the end, 215 * or from the place where error occured. 216 * e contains the entry that was not unregistered 217 */ 218 if (error) 219 e1 = TAILQ_PREV(e, sysctl_ctx_list, link); 220 else 221 e1 = TAILQ_LAST(clist, sysctl_ctx_list); 222 while (e1 != NULL) { 223 sysctl_register_oid(e1->entry); 224 e1 = TAILQ_PREV(e1, sysctl_ctx_list, link); 225 } 226 if (error) 227 return(EBUSY); 228 /* Now really delete the entries */ 229 e = TAILQ_FIRST(clist); 230 while (e != NULL) { 231 e1 = TAILQ_NEXT(e, link); 232 error = sysctl_remove_oid(e->entry, 1, 0); 233 if (error) 234 panic("sysctl_remove_oid: corrupt tree, entry: %s", 235 e->entry->oid_name); 236 free(e, M_SYSCTLOID); 237 e = e1; 238 } 239 return (error); 240 } 241 242 /* Add an entry to the context */ 243 struct sysctl_ctx_entry * 244 sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 245 { 246 struct sysctl_ctx_entry *e; 247 248 if (clist == NULL || oidp == NULL) 249 return(NULL); 250 e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK); 251 e->entry = oidp; 252 TAILQ_INSERT_HEAD(clist, e, link); 253 return (e); 254 } 255 256 /* Find an entry in the context */ 257 struct sysctl_ctx_entry * 258 sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 259 { 260 struct sysctl_ctx_entry *e; 261 262 if (clist == NULL || oidp == NULL) 263 return(NULL); 264 TAILQ_FOREACH(e, clist, link) { 265 if(e->entry == oidp) 266 return(e); 267 } 268 return (e); 269 } 270 271 /* 272 * Delete an entry from the context. 273 * NOTE: this function doesn't free oidp! You have to remove it 274 * with sysctl_remove_oid(). 275 */ 276 int 277 sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 278 { 279 struct sysctl_ctx_entry *e; 280 281 if (clist == NULL || oidp == NULL) 282 return (EINVAL); 283 e = sysctl_ctx_entry_find(clist, oidp); 284 if (e != NULL) { 285 TAILQ_REMOVE(clist, e, link); 286 free(e, M_SYSCTLOID); 287 return (0); 288 } else 289 return (ENOENT); 290 } 291 292 /* 293 * Remove dynamically created sysctl trees. 294 * oidp - top of the tree to be removed 295 * del - if 0 - just deregister, otherwise free up entries as well 296 * recurse - if != 0 traverse the subtree to be deleted 297 */ 298 int 299 sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse) 300 { 301 struct sysctl_oid *p; 302 int error; 303 304 if (oidp == NULL) 305 return(EINVAL); 306 if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { 307 printf("can't remove non-dynamic nodes!\n"); 308 return (EINVAL); 309 } 310 /* 311 * WARNING: normal method to do this should be through 312 * sysctl_ctx_free(). Use recursing as the last resort 313 * method to purge your sysctl tree of leftovers... 314 * However, if some other code still references these nodes, 315 * it will panic. 316 */ 317 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 318 if (oidp->oid_refcnt == 1) { 319 SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) { 320 if (!recurse) 321 return (ENOTEMPTY); 322 error = sysctl_remove_oid(p, del, recurse); 323 if (error) 324 return (error); 325 } 326 if (del) 327 free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID); 328 } 329 } 330 if (oidp->oid_refcnt > 1 ) { 331 oidp->oid_refcnt--; 332 } else { 333 if (oidp->oid_refcnt == 0) { 334 printf("Warning: bad oid_refcnt=%u (%s)!\n", 335 oidp->oid_refcnt, oidp->oid_name); 336 return (EINVAL); 337 } 338 sysctl_unregister_oid(oidp); 339 if (del) { 340 if (oidp->descr) 341 free((void *)(uintptr_t)(const void *)oidp->descr, M_SYSCTLOID); 342 free((void *)(uintptr_t)(const void *)oidp->oid_name, 343 M_SYSCTLOID); 344 free(oidp, M_SYSCTLOID); 345 } 346 } 347 return (0); 348 } 349 350 /* 351 * Create new sysctls at run time. 352 * clist may point to a valid context initialized with sysctl_ctx_init(). 353 */ 354 struct sysctl_oid * 355 sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, 356 int number, const char *name, int kind, void *arg1, int arg2, 357 int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr) 358 { 359 struct sysctl_oid *oidp; 360 ssize_t len; 361 char *newname; 362 363 /* You have to hook up somewhere.. */ 364 if (parent == NULL) 365 return(NULL); 366 /* Check if the node already exists, otherwise create it */ 367 oidp = sysctl_find_oidname(name, parent); 368 if (oidp != NULL) { 369 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 370 oidp->oid_refcnt++; 371 /* Update the context */ 372 if (clist != NULL) 373 sysctl_ctx_entry_add(clist, oidp); 374 return (oidp); 375 } else { 376 printf("can't re-use a leaf (%s)!\n", name); 377 return (NULL); 378 } 379 } 380 oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); 381 oidp->oid_parent = parent; 382 SLIST_NEXT(oidp, oid_link) = NULL; 383 oidp->oid_number = number; 384 oidp->oid_refcnt = 1; 385 len = strlen(name); 386 newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 387 bcopy(name, newname, len + 1); 388 newname[len] = '\0'; 389 oidp->oid_name = newname; 390 oidp->oid_handler = handler; 391 oidp->oid_kind = CTLFLAG_DYN | kind; 392 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 393 /* Allocate space for children */ 394 SYSCTL_CHILDREN(oidp) = malloc(sizeof(struct sysctl_oid_list), 395 M_SYSCTLOID, M_WAITOK); 396 SLIST_INIT(SYSCTL_CHILDREN(oidp)); 397 } else { 398 oidp->oid_arg1 = arg1; 399 oidp->oid_arg2 = arg2; 400 } 401 oidp->oid_fmt = fmt; 402 if (descr) { 403 int len = strlen(descr) + 1; 404 oidp->descr = malloc(len, M_SYSCTLOID, M_WAITOK); 405 if (oidp->descr) 406 strcpy((char *)(uintptr_t)(const void *)oidp->descr, descr); 407 } 408 /* Update the context, if used */ 409 if (clist != NULL) 410 sysctl_ctx_entry_add(clist, oidp); 411 /* Register this oid */ 412 sysctl_register_oid(oidp); 413 return (oidp); 414 } 415 416 /* 417 * Register the kernel's oids on startup. 418 */ 419 SET_DECLARE(sysctl_set, struct sysctl_oid); 420 421 static void 422 sysctl_register_all(void *arg) 423 { 424 struct sysctl_oid **oidp; 425 426 SYSCTL_INIT(); 427 SET_FOREACH(oidp, sysctl_set) 428 sysctl_register_oid(*oidp); 429 } 430 SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0); 431 432 /* 433 * "Staff-functions" 434 * 435 * These functions implement a presently undocumented interface 436 * used by the sysctl program to walk the tree, and get the type 437 * so it can print the value. 438 * This interface is under work and consideration, and should probably 439 * be killed with a big axe by the first person who can find the time. 440 * (be aware though, that the proper interface isn't as obvious as it 441 * may seem, there are various conflicting requirements. 442 * 443 * {0,0} printf the entire MIB-tree. 444 * {0,1,...} return the name of the "..." OID. 445 * {0,2,...} return the next OID. 446 * {0,3} return the OID of the name in "new" 447 * {0,4,...} return the kind & format info for the "..." OID. 448 * {0,5,...} return the description the "..." OID. 449 */ 450 451 static void 452 sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) 453 { 454 int k; 455 struct sysctl_oid *oidp; 456 457 SLIST_FOREACH(oidp, l, oid_link) { 458 459 for (k=0; k<i; k++) 460 printf(" "); 461 462 printf("%d %s ", oidp->oid_number, oidp->oid_name); 463 464 printf("%c%c", 465 oidp->oid_kind & CTLFLAG_RD ? 'R':' ', 466 oidp->oid_kind & CTLFLAG_WR ? 'W':' '); 467 468 if (oidp->oid_handler) 469 printf(" *Handler"); 470 471 switch (oidp->oid_kind & CTLTYPE) { 472 case CTLTYPE_NODE: 473 printf(" Node\n"); 474 if (!oidp->oid_handler) { 475 sysctl_sysctl_debug_dump_node( 476 oidp->oid_arg1, i+2); 477 } 478 break; 479 case CTLTYPE_INT: printf(" Int\n"); break; 480 case CTLTYPE_STRING: printf(" String\n"); break; 481 case CTLTYPE_QUAD: printf(" Quad\n"); break; 482 case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; 483 default: printf("\n"); 484 } 485 486 } 487 } 488 489 static int 490 sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) 491 { 492 int error; 493 494 error = suser(req->td); 495 if (error) 496 return error; 497 sysctl_sysctl_debug_dump_node(&sysctl__children, 0); 498 return ENOENT; 499 } 500 501 SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD, 502 0, 0, sysctl_sysctl_debug, "-", ""); 503 504 static int 505 sysctl_sysctl_name(SYSCTL_HANDLER_ARGS) 506 { 507 int *name = (int *) arg1; 508 u_int namelen = arg2; 509 int error = 0; 510 struct sysctl_oid *oid; 511 struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; 512 char buf[10]; 513 514 while (namelen) { 515 if (!lsp) { 516 snprintf(buf,sizeof(buf),"%d",*name); 517 if (req->oldidx) 518 error = SYSCTL_OUT(req, ".", 1); 519 if (!error) 520 error = SYSCTL_OUT(req, buf, strlen(buf)); 521 if (error) 522 return (error); 523 namelen--; 524 name++; 525 continue; 526 } 527 lsp2 = 0; 528 SLIST_FOREACH(oid, lsp, oid_link) { 529 if (oid->oid_number != *name) 530 continue; 531 532 if (req->oldidx) 533 error = SYSCTL_OUT(req, ".", 1); 534 if (!error) 535 error = SYSCTL_OUT(req, oid->oid_name, 536 strlen(oid->oid_name)); 537 if (error) 538 return (error); 539 540 namelen--; 541 name++; 542 543 if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 544 break; 545 546 if (oid->oid_handler) 547 break; 548 549 lsp2 = (struct sysctl_oid_list *)oid->oid_arg1; 550 break; 551 } 552 lsp = lsp2; 553 } 554 return (SYSCTL_OUT(req, "", 1)); 555 } 556 557 SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, ""); 558 559 static int 560 sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 561 int *next, int *len, int level, struct sysctl_oid **oidpp) 562 { 563 struct sysctl_oid *oidp; 564 565 *len = level; 566 SLIST_FOREACH(oidp, lsp, oid_link) { 567 *next = oidp->oid_number; 568 *oidpp = oidp; 569 570 if (oidp->oid_kind & CTLFLAG_SKIP) 571 continue; 572 573 if (!namelen) { 574 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 575 return 0; 576 if (oidp->oid_handler) 577 /* We really should call the handler here...*/ 578 return 0; 579 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 580 if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 581 len, level+1, oidpp)) 582 return 0; 583 goto emptynode; 584 } 585 586 if (oidp->oid_number < *name) 587 continue; 588 589 if (oidp->oid_number > *name) { 590 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 591 return 0; 592 if (oidp->oid_handler) 593 return 0; 594 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 595 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 596 next+1, len, level+1, oidpp)) 597 return (0); 598 goto next; 599 } 600 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 601 continue; 602 603 if (oidp->oid_handler) 604 continue; 605 606 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 607 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 608 len, level+1, oidpp)) 609 return (0); 610 next: 611 namelen = 1; 612 emptynode: 613 *len = level; 614 } 615 return 1; 616 } 617 618 static int 619 sysctl_sysctl_next(SYSCTL_HANDLER_ARGS) 620 { 621 int *name = (int *) arg1; 622 u_int namelen = arg2; 623 int i, j, error; 624 struct sysctl_oid *oid; 625 struct sysctl_oid_list *lsp = &sysctl__children; 626 int newoid[CTL_MAXNAME]; 627 628 i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); 629 if (i) 630 return ENOENT; 631 error = SYSCTL_OUT(req, newoid, j * sizeof (int)); 632 return (error); 633 } 634 635 SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, ""); 636 637 static int 638 name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidpp) 639 { 640 int i; 641 struct sysctl_oid *oidp; 642 struct sysctl_oid_list *lsp = &sysctl__children; 643 char *p; 644 645 if (!*name) 646 return ENOENT; 647 648 p = name + strlen(name) - 1 ; 649 if (*p == '.') 650 *p = '\0'; 651 652 *len = 0; 653 654 for (p = name; *p && *p != '.'; p++) 655 ; 656 i = *p; 657 if (i == '.') 658 *p = '\0'; 659 660 oidp = SLIST_FIRST(lsp); 661 662 while (oidp && *len < CTL_MAXNAME) { 663 if (strcmp(name, oidp->oid_name)) { 664 oidp = SLIST_NEXT(oidp, oid_link); 665 continue; 666 } 667 *oid++ = oidp->oid_number; 668 (*len)++; 669 670 if (!i) { 671 if (oidpp) 672 *oidpp = oidp; 673 return (0); 674 } 675 676 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 677 break; 678 679 if (oidp->oid_handler) 680 break; 681 682 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 683 oidp = SLIST_FIRST(lsp); 684 name = p+1; 685 for (p = name; *p && *p != '.'; p++) 686 ; 687 i = *p; 688 if (i == '.') 689 *p = '\0'; 690 } 691 return ENOENT; 692 } 693 694 static int 695 sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) 696 { 697 char *p; 698 int error, oid[CTL_MAXNAME], len; 699 struct sysctl_oid *op = 0; 700 701 if (!req->newlen) 702 return ENOENT; 703 if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ 704 return (ENAMETOOLONG); 705 706 p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); 707 708 error = SYSCTL_IN(req, p, req->newlen); 709 if (error) { 710 free(p, M_SYSCTL); 711 return (error); 712 } 713 714 p [req->newlen] = '\0'; 715 716 error = name2oid(p, oid, &len, &op); 717 718 free(p, M_SYSCTL); 719 720 if (error) 721 return (error); 722 723 error = SYSCTL_OUT(req, oid, len * sizeof *oid); 724 return (error); 725 } 726 727 SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0, 728 sysctl_sysctl_name2oid, "I", ""); 729 730 static int 731 sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) 732 { 733 struct sysctl_oid *oid; 734 int error; 735 736 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 737 if (error) 738 return (error); 739 740 if (!oid->oid_fmt) 741 return (ENOENT); 742 error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); 743 if (error) 744 return (error); 745 error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); 746 return (error); 747 } 748 749 750 SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, ""); 751 752 static int 753 sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) 754 { 755 struct sysctl_oid *oid; 756 int error; 757 758 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 759 if (error) 760 return (error); 761 762 if (!oid->descr) 763 return (ENOENT); 764 error = SYSCTL_OUT(req, oid->descr, strlen(oid->descr) + 1); 765 return (error); 766 } 767 768 SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, ""); 769 770 /* 771 * Default "handler" functions. 772 */ 773 774 /* 775 * Handle an int, signed or unsigned. 776 * Two cases: 777 * a variable: point arg1 at it. 778 * a constant: pass it in arg2. 779 */ 780 781 int 782 sysctl_handle_int(SYSCTL_HANDLER_ARGS) 783 { 784 int tmpout, error = 0; 785 786 /* 787 * Attempt to get a coherent snapshot by making a copy of the data. 788 */ 789 if (arg1) 790 tmpout = *(int *)arg1; 791 else 792 tmpout = arg2; 793 error = SYSCTL_OUT(req, &tmpout, sizeof(int)); 794 795 if (error || !req->newptr) 796 return (error); 797 798 if (!arg1) 799 error = EPERM; 800 else 801 error = SYSCTL_IN(req, arg1, sizeof(int)); 802 return (error); 803 } 804 805 /* 806 * Handle a long, signed or unsigned. arg1 points to it. 807 */ 808 809 int 810 sysctl_handle_long(SYSCTL_HANDLER_ARGS) 811 { 812 int error = 0; 813 long tmpout; 814 815 /* 816 * Attempt to get a coherent snapshot by making a copy of the data. 817 */ 818 if (!arg1) 819 return (EINVAL); 820 tmpout = *(long *)arg1; 821 error = SYSCTL_OUT(req, &tmpout, sizeof(long)); 822 823 if (error || !req->newptr) 824 return (error); 825 826 error = SYSCTL_IN(req, arg1, sizeof(long)); 827 return (error); 828 } 829 830 /* 831 * Handle our generic '\0' terminated 'C' string. 832 * Two cases: 833 * a variable string: point arg1 at it, arg2 is max length. 834 * a constant string: point arg1 at it, arg2 is zero. 835 */ 836 837 int 838 sysctl_handle_string(SYSCTL_HANDLER_ARGS) 839 { 840 int error=0; 841 char *tmparg; 842 size_t outlen; 843 844 /* 845 * Attempt to get a coherent snapshot by copying to a 846 * temporary kernel buffer. 847 */ 848 retry: 849 outlen = strlen((char *)arg1)+1; 850 tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK); 851 852 if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) { 853 free(tmparg, M_SYSCTLTMP); 854 goto retry; 855 } 856 857 error = SYSCTL_OUT(req, tmparg, outlen); 858 free(tmparg, M_SYSCTLTMP); 859 860 if (error || !req->newptr) 861 return (error); 862 863 if ((req->newlen - req->newidx) >= arg2) { 864 error = EINVAL; 865 } else { 866 arg2 = (req->newlen - req->newidx); 867 error = SYSCTL_IN(req, arg1, arg2); 868 ((char *)arg1)[arg2] = '\0'; 869 } 870 871 return (error); 872 } 873 874 /* 875 * Handle any kind of opaque data. 876 * arg1 points to it, arg2 is the size. 877 */ 878 879 int 880 sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 881 { 882 int error; 883 void *tmparg; 884 885 /* 886 * Attempt to get a coherent snapshot, either by wiring the 887 * user space buffer or copying to a temporary kernel buffer 888 * depending on the size of the data. 889 */ 890 if (arg2 > PAGE_SIZE) { 891 sysctl_wire_old_buffer(req, arg2); 892 error = SYSCTL_OUT(req, arg1, arg2); 893 } else { 894 tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK); 895 bcopy(arg1, tmparg, arg2); 896 error = SYSCTL_OUT(req, tmparg, arg2); 897 free(tmparg, M_SYSCTLTMP); 898 } 899 900 if (error || !req->newptr) 901 return (error); 902 903 error = SYSCTL_IN(req, arg1, arg2); 904 905 return (error); 906 } 907 908 /* 909 * Transfer functions to/from kernel space. 910 * XXX: rather untested at this point 911 */ 912 static int 913 sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) 914 { 915 size_t i = 0; 916 917 if (req->oldptr) { 918 i = l; 919 if (req->oldlen <= req->oldidx) 920 i = 0; 921 else 922 if (i > req->oldlen - req->oldidx) 923 i = req->oldlen - req->oldidx; 924 if (i > 0) 925 bcopy(p, (char *)req->oldptr + req->oldidx, i); 926 } 927 req->oldidx += l; 928 if (req->oldptr && i != l) 929 return (ENOMEM); 930 return (0); 931 } 932 933 static int 934 sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) 935 { 936 if (!req->newptr) 937 return 0; 938 if (req->newlen - req->newidx < l) 939 return (EINVAL); 940 bcopy((char *)req->newptr + req->newidx, p, l); 941 req->newidx += l; 942 return (0); 943 } 944 945 int 946 kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 947 size_t *oldlenp, void *new, size_t newlen, size_t *retval) 948 { 949 int error = 0; 950 struct sysctl_req req; 951 952 bzero(&req, sizeof req); 953 954 req.td = td; 955 956 if (oldlenp) { 957 req.oldlen = *oldlenp; 958 } 959 960 if (old) { 961 req.oldptr= old; 962 } 963 964 if (new != NULL) { 965 req.newlen = newlen; 966 req.newptr = new; 967 } 968 969 req.oldfunc = sysctl_old_kernel; 970 req.newfunc = sysctl_new_kernel; 971 req.lock = 1; 972 973 SYSCTL_LOCK(); 974 975 error = sysctl_root(0, name, namelen, &req); 976 977 if (req.lock == 2) 978 vsunlock(req.oldptr, req.oldlen); 979 980 SYSCTL_UNLOCK(); 981 982 if (error && error != ENOMEM) 983 return (error); 984 985 if (retval) { 986 if (req.oldptr && req.oldidx > req.oldlen) 987 *retval = req.oldlen; 988 else 989 *retval = req.oldidx; 990 } 991 return (error); 992 } 993 994 int 995 kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, 996 void *new, size_t newlen, size_t *retval) 997 { 998 int oid[CTL_MAXNAME]; 999 size_t oidlen, plen; 1000 int error; 1001 1002 oid[0] = 0; /* sysctl internal magic */ 1003 oid[1] = 3; /* name2oid */ 1004 oidlen = sizeof(oid); 1005 1006 error = kernel_sysctl(td, oid, 2, oid, &oidlen, 1007 (void *)name, strlen(name), &plen); 1008 if (error) 1009 return (error); 1010 1011 error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, 1012 new, newlen, retval); 1013 return (error); 1014 } 1015 1016 /* 1017 * Transfer function to/from user space. 1018 */ 1019 static int 1020 sysctl_old_user(struct sysctl_req *req, const void *p, size_t l) 1021 { 1022 int error = 0; 1023 size_t i = 0; 1024 1025 if (req->lock == 1 && req->oldptr) 1026 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1027 "sysctl_old_user()"); 1028 if (req->oldptr) { 1029 i = l; 1030 if (req->oldlen <= req->oldidx) 1031 i = 0; 1032 else 1033 if (i > req->oldlen - req->oldidx) 1034 i = req->oldlen - req->oldidx; 1035 if (i > 0) 1036 error = copyout(p, (char *)req->oldptr + req->oldidx, 1037 i); 1038 } 1039 req->oldidx += l; 1040 if (error) 1041 return (error); 1042 if (req->oldptr && i < l) 1043 return (ENOMEM); 1044 return (0); 1045 } 1046 1047 static int 1048 sysctl_new_user(struct sysctl_req *req, void *p, size_t l) 1049 { 1050 int error; 1051 1052 if (!req->newptr) 1053 return 0; 1054 if (req->newlen - req->newidx < l) 1055 return (EINVAL); 1056 error = copyin((char *)req->newptr + req->newidx, p, l); 1057 req->newidx += l; 1058 return (error); 1059 } 1060 1061 /* 1062 * Wire the user space destination buffer. If set to a value greater than 1063 * zero, the len parameter limits the maximum amount of wired memory. 1064 * 1065 * XXX - The len parameter is currently ignored due to the lack of 1066 * a place to save it in the sysctl_req structure so that the matching 1067 * amount of memory can be unwired in the sysctl exit code. 1068 */ 1069 void 1070 sysctl_wire_old_buffer(struct sysctl_req *req, size_t len) 1071 { 1072 if (req->lock == 1 && req->oldptr && req->oldfunc == sysctl_old_user) { 1073 vslock(req->oldptr, req->oldlen); 1074 req->lock = 2; 1075 } 1076 } 1077 1078 int 1079 sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 1080 int *nindx, struct sysctl_req *req) 1081 { 1082 struct sysctl_oid *oid; 1083 int indx; 1084 1085 oid = SLIST_FIRST(&sysctl__children); 1086 indx = 0; 1087 while (oid && indx < CTL_MAXNAME) { 1088 if (oid->oid_number == name[indx]) { 1089 indx++; 1090 if (oid->oid_kind & CTLFLAG_NOLOCK) 1091 req->lock = 0; 1092 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1093 if (oid->oid_handler != NULL || 1094 indx == namelen) { 1095 *noid = oid; 1096 if (nindx != NULL) 1097 *nindx = indx; 1098 return (0); 1099 } 1100 oid = SLIST_FIRST( 1101 (struct sysctl_oid_list *)oid->oid_arg1); 1102 } else if (indx == namelen) { 1103 *noid = oid; 1104 if (nindx != NULL) 1105 *nindx = indx; 1106 return (0); 1107 } else { 1108 return (ENOTDIR); 1109 } 1110 } else { 1111 oid = SLIST_NEXT(oid, oid_link); 1112 } 1113 } 1114 return (ENOENT); 1115 } 1116 1117 /* 1118 * Traverse our tree, and find the right node, execute whatever it points 1119 * to, and return the resulting error code. 1120 */ 1121 1122 static int 1123 sysctl_root(SYSCTL_HANDLER_ARGS) 1124 { 1125 struct sysctl_oid *oid; 1126 int error, indx, lvl; 1127 1128 error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); 1129 if (error) 1130 return (error); 1131 1132 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1133 /* 1134 * You can't call a sysctl when it's a node, but has 1135 * no handler. Inform the user that it's a node. 1136 * The indx may or may not be the same as namelen. 1137 */ 1138 if (oid->oid_handler == NULL) 1139 return (EISDIR); 1140 } 1141 1142 /* Is this sysctl writable? */ 1143 if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) 1144 return (EPERM); 1145 1146 KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); 1147 1148 /* Is this sysctl sensitive to securelevels? */ 1149 if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { 1150 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE; 1151 error = securelevel_gt(req->td->td_ucred, lvl); 1152 if (error) 1153 return (error); 1154 } 1155 1156 /* Is this sysctl writable by only privileged users? */ 1157 if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { 1158 int flags; 1159 1160 if (oid->oid_kind & CTLFLAG_PRISON) 1161 flags = PRISON_ROOT; 1162 else 1163 flags = 0; 1164 error = suser_cred(req->td->td_ucred, flags); 1165 if (error) 1166 return (error); 1167 } 1168 1169 if (!oid->oid_handler) 1170 return EINVAL; 1171 1172 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) 1173 error = oid->oid_handler(oid, (int *)arg1 + indx, arg2 - indx, 1174 req); 1175 else 1176 error = oid->oid_handler(oid, oid->oid_arg1, oid->oid_arg2, 1177 req); 1178 return (error); 1179 } 1180 1181 #ifndef _SYS_SYSPROTO_H_ 1182 struct sysctl_args { 1183 int *name; 1184 u_int namelen; 1185 void *old; 1186 size_t *oldlenp; 1187 void *new; 1188 size_t newlen; 1189 }; 1190 #endif 1191 1192 /* 1193 * MPSAFE 1194 */ 1195 int 1196 __sysctl(struct thread *td, struct sysctl_args *uap) 1197 { 1198 int error, name[CTL_MAXNAME]; 1199 size_t j; 1200 1201 if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) 1202 return (EINVAL); 1203 1204 error = copyin(uap->name, &name, uap->namelen * sizeof(int)); 1205 if (error) 1206 return (error); 1207 1208 mtx_lock(&Giant); 1209 1210 error = userland_sysctl(td, name, uap->namelen, 1211 uap->old, uap->oldlenp, 0, 1212 uap->new, uap->newlen, &j); 1213 if (error && error != ENOMEM) 1214 goto done2; 1215 if (uap->oldlenp) { 1216 int i = copyout(&j, uap->oldlenp, sizeof(j)); 1217 if (i) 1218 error = i; 1219 } 1220 done2: 1221 mtx_unlock(&Giant); 1222 return (error); 1223 } 1224 1225 /* 1226 * This is used from various compatibility syscalls too. That's why name 1227 * must be in kernel space. 1228 */ 1229 int 1230 userland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1231 size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval) 1232 { 1233 int error = 0; 1234 struct sysctl_req req, req2; 1235 1236 bzero(&req, sizeof req); 1237 1238 req.td = td; 1239 1240 if (oldlenp) { 1241 if (inkernel) { 1242 req.oldlen = *oldlenp; 1243 } else { 1244 error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); 1245 if (error) 1246 return (error); 1247 } 1248 } 1249 1250 if (old) { 1251 if (!useracc(old, req.oldlen, VM_PROT_WRITE)) 1252 return (EFAULT); 1253 req.oldptr= old; 1254 } 1255 1256 if (new != NULL) { 1257 if (!useracc(new, req.newlen, VM_PROT_READ)) 1258 return (EFAULT); 1259 req.newlen = newlen; 1260 req.newptr = new; 1261 } 1262 1263 req.oldfunc = sysctl_old_user; 1264 req.newfunc = sysctl_new_user; 1265 req.lock = 1; 1266 1267 SYSCTL_LOCK(); 1268 1269 #ifdef MAC 1270 error = mac_check_system_sysctl(td->td_ucred, name, namelen, old, 1271 oldlenp, inkernel, new, newlen); 1272 if (error) { 1273 SYSCTL_UNLOCK(); 1274 return (error); 1275 } 1276 #endif 1277 1278 do { 1279 req2 = req; 1280 error = sysctl_root(0, name, namelen, &req2); 1281 } while (error == EAGAIN); 1282 1283 req = req2; 1284 if (req.lock == 2) 1285 vsunlock(req.oldptr, req.oldlen); 1286 1287 SYSCTL_UNLOCK(); 1288 1289 if (error && error != ENOMEM) 1290 return (error); 1291 1292 if (retval) { 1293 if (req.oldptr && req.oldidx > req.oldlen) 1294 *retval = req.oldlen; 1295 else 1296 *retval = req.oldidx; 1297 } 1298 return (error); 1299 } 1300 1301 #ifdef COMPAT_43 1302 #include <sys/socket.h> 1303 #include <vm/vm_param.h> 1304 1305 #define KINFO_PROC (0<<8) 1306 #define KINFO_RT (1<<8) 1307 #define KINFO_VNODE (2<<8) 1308 #define KINFO_FILE (3<<8) 1309 #define KINFO_METER (4<<8) 1310 #define KINFO_LOADAVG (5<<8) 1311 #define KINFO_CLOCKRATE (6<<8) 1312 1313 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */ 1314 #define KINFO_BSDI_SYSINFO (101<<8) 1315 1316 /* 1317 * XXX this is bloat, but I hope it's better here than on the potentially 1318 * limited kernel stack... -Peter 1319 */ 1320 1321 static struct { 1322 int bsdi_machine; /* "i386" on BSD/386 */ 1323 /* ^^^ this is an offset to the string, relative to the struct start */ 1324 char *pad0; 1325 long pad1; 1326 long pad2; 1327 long pad3; 1328 u_long pad4; 1329 u_long pad5; 1330 u_long pad6; 1331 1332 int bsdi_ostype; /* "BSD/386" on BSD/386 */ 1333 int bsdi_osrelease; /* "1.1" on BSD/386 */ 1334 long pad7; 1335 long pad8; 1336 char *pad9; 1337 1338 long pad10; 1339 long pad11; 1340 int pad12; 1341 long pad13; 1342 quad_t pad14; 1343 long pad15; 1344 1345 struct timeval pad16; 1346 /* we dont set this, because BSDI's uname used gethostname() instead */ 1347 int bsdi_hostname; /* hostname on BSD/386 */ 1348 1349 /* the actual string data is appended here */ 1350 1351 } bsdi_si; 1352 /* 1353 * this data is appended to the end of the bsdi_si structure during copyout. 1354 * The "char *" offsets are relative to the base of the bsdi_si struct. 1355 * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings 1356 * should not exceed the length of the buffer here... (or else!! :-) 1357 */ 1358 static char bsdi_strings[80]; /* It had better be less than this! */ 1359 1360 #ifndef _SYS_SYSPROTO_H_ 1361 struct getkerninfo_args { 1362 int op; 1363 char *where; 1364 size_t *size; 1365 int arg; 1366 }; 1367 #endif 1368 1369 /* 1370 * MPSAFE 1371 */ 1372 int 1373 ogetkerninfo(struct thread *td, struct getkerninfo_args *uap) 1374 { 1375 int error, name[6]; 1376 size_t size; 1377 u_int needed = 0; 1378 1379 mtx_lock(&Giant); 1380 1381 switch (uap->op & 0xff00) { 1382 1383 case KINFO_RT: 1384 name[0] = CTL_NET; 1385 name[1] = PF_ROUTE; 1386 name[2] = 0; 1387 name[3] = (uap->op & 0xff0000) >> 16; 1388 name[4] = uap->op & 0xff; 1389 name[5] = uap->arg; 1390 error = userland_sysctl(td, name, 6, uap->where, uap->size, 1391 0, 0, 0, &size); 1392 break; 1393 1394 case KINFO_VNODE: 1395 name[0] = CTL_KERN; 1396 name[1] = KERN_VNODE; 1397 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1398 0, 0, 0, &size); 1399 break; 1400 1401 case KINFO_PROC: 1402 name[0] = CTL_KERN; 1403 name[1] = KERN_PROC; 1404 name[2] = uap->op & 0xff; 1405 name[3] = uap->arg; 1406 error = userland_sysctl(td, name, 4, uap->where, uap->size, 1407 0, 0, 0, &size); 1408 break; 1409 1410 case KINFO_FILE: 1411 name[0] = CTL_KERN; 1412 name[1] = KERN_FILE; 1413 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1414 0, 0, 0, &size); 1415 break; 1416 1417 case KINFO_METER: 1418 name[0] = CTL_VM; 1419 name[1] = VM_TOTAL; 1420 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1421 0, 0, 0, &size); 1422 break; 1423 1424 case KINFO_LOADAVG: 1425 name[0] = CTL_VM; 1426 name[1] = VM_LOADAVG; 1427 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1428 0, 0, 0, &size); 1429 break; 1430 1431 case KINFO_CLOCKRATE: 1432 name[0] = CTL_KERN; 1433 name[1] = KERN_CLOCKRATE; 1434 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1435 0, 0, 0, &size); 1436 break; 1437 1438 case KINFO_BSDI_SYSINFO: { 1439 /* 1440 * this is pretty crude, but it's just enough for uname() 1441 * from BSDI's 1.x libc to work. 1442 * 1443 * *size gives the size of the buffer before the call, and 1444 * the amount of data copied after a successful call. 1445 * If successful, the return value is the amount of data 1446 * available, which can be larger than *size. 1447 * 1448 * BSDI's 2.x product apparently fails with ENOMEM if *size 1449 * is too small. 1450 */ 1451 1452 u_int left; 1453 char *s; 1454 1455 bzero((char *)&bsdi_si, sizeof(bsdi_si)); 1456 bzero(bsdi_strings, sizeof(bsdi_strings)); 1457 1458 s = bsdi_strings; 1459 1460 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si); 1461 strcpy(s, ostype); 1462 s += strlen(s) + 1; 1463 1464 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si); 1465 strcpy(s, osrelease); 1466 s += strlen(s) + 1; 1467 1468 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si); 1469 strcpy(s, machine); 1470 s += strlen(s) + 1; 1471 1472 needed = sizeof(bsdi_si) + (s - bsdi_strings); 1473 1474 if ((uap->where == NULL) || (uap->size == NULL)) { 1475 /* process is asking how much buffer to supply.. */ 1476 size = needed; 1477 error = 0; 1478 break; 1479 } 1480 1481 if ((error = copyin(uap->size, &size, sizeof(size))) != 0) 1482 break; 1483 1484 /* if too much buffer supplied, trim it down */ 1485 if (size > needed) 1486 size = needed; 1487 1488 /* how much of the buffer is remaining */ 1489 left = size; 1490 1491 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0) 1492 break; 1493 1494 /* is there any point in continuing? */ 1495 if (left > sizeof(bsdi_si)) { 1496 left -= sizeof(bsdi_si); 1497 error = copyout(&bsdi_strings, 1498 uap->where + sizeof(bsdi_si), left); 1499 } 1500 break; 1501 } 1502 1503 default: 1504 error = EOPNOTSUPP; 1505 break; 1506 } 1507 if (error == 0) { 1508 td->td_retval[0] = needed ? needed : size; 1509 if (uap->size) { 1510 error = copyout(&size, uap->size, sizeof(size)); 1511 } 1512 } 1513 mtx_unlock(&Giant); 1514 return (error); 1515 } 1516 #endif /* COMPAT_43 */
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