2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Mike Karels at Berkeley Software Design, Inc.
10 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
11 * project, to make these variables more userfriendly.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
40 #include <sys/cdefs.h>
41 #include "opt_capsicum.h"
43 #include "opt_ktrace.h"
44 #include "opt_sysctl.h"
46 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/capsicum.h>
50 #include <sys/kernel.h>
51 #include <sys/limits.h>
52 #include <sys/sysctl.h>
53 #include <sys/malloc.h>
59 #include <sys/mutex.h>
60 #include <sys/rmlock.h>
63 #include <sys/sysproto.h>
66 #include <sys/ktrace.h>
71 #include <ddb/db_lex.h>
76 #include <security/mac/mac_framework.h>
79 #include <vm/vm_extern.h>
81 static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic");
82 static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids");
83 static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer");
85 RB_GENERATE(sysctl_oid_list, sysctl_oid, oid_link, cmp_sysctl_oid);
88 * The sysctllock protects the MIB tree. It also protects sysctl
89 * contexts used with dynamic sysctls. The sysctl_register_oid() and
90 * sysctl_unregister_oid() routines require the sysctllock to already
91 * be held, so the sysctl_wlock() and sysctl_wunlock() routines are
92 * provided for the few places in the kernel which need to use that
93 * API rather than using the dynamic API. Use of the dynamic API is
94 * strongly encouraged for most code.
96 * The sysctlmemlock is used to limit the amount of user memory wired for
97 * sysctl requests. This is implemented by serializing any userland
98 * sysctl requests larger than a single page via an exclusive lock.
100 * The sysctlstringlock is used to protect concurrent access to writable
101 * string nodes in sysctl_handle_string().
103 static struct rmlock sysctllock;
104 static struct sx __exclusive_cache_line sysctlmemlock;
105 static struct sx sysctlstringlock;
107 #define SYSCTL_WLOCK() rm_wlock(&sysctllock)
108 #define SYSCTL_WUNLOCK() rm_wunlock(&sysctllock)
109 #define SYSCTL_RLOCK(tracker) rm_rlock(&sysctllock, (tracker))
110 #define SYSCTL_RUNLOCK(tracker) rm_runlock(&sysctllock, (tracker))
111 #define SYSCTL_WLOCKED() rm_wowned(&sysctllock)
112 #define SYSCTL_ASSERT_LOCKED() rm_assert(&sysctllock, RA_LOCKED)
113 #define SYSCTL_ASSERT_WLOCKED() rm_assert(&sysctllock, RA_WLOCKED)
114 #define SYSCTL_ASSERT_RLOCKED() rm_assert(&sysctllock, RA_RLOCKED)
115 #define SYSCTL_INIT() rm_init_flags(&sysctllock, "sysctl lock", \
117 #define SYSCTL_SLEEP(ch, wmesg, timo) \
118 rm_sleep(ch, &sysctllock, 0, wmesg, timo)
120 static int sysctl_root(SYSCTL_HANDLER_ARGS);
123 struct sysctl_oid_list sysctl__children = RB_INITIALIZER(&sysctl__children);
125 static char* sysctl_escape_name(const char*);
126 static int sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del,
128 static int sysctl_old_kernel(struct sysctl_req *, const void *, size_t);
129 static int sysctl_new_kernel(struct sysctl_req *, void *, size_t);
131 static struct sysctl_oid *
132 sysctl_find_oidname(const char *name, struct sysctl_oid_list *list)
134 struct sysctl_oid *oidp;
136 SYSCTL_ASSERT_LOCKED();
137 SYSCTL_FOREACH(oidp, list) {
138 if (strcmp(oidp->oid_name, name) == 0) {
146 * Initialization of the MIB tree.
148 * Order by number in each list.
165 sysctl_root_handler_locked(struct sysctl_oid *oid, void *arg1, intmax_t arg2,
166 struct sysctl_req *req, struct rm_priotracker *tracker)
170 if (oid->oid_kind & CTLFLAG_DYN)
171 atomic_add_int(&oid->oid_running, 1);
174 SYSCTL_RUNLOCK(tracker);
179 * Treat set CTLFLAG_NEEDGIANT and unset CTLFLAG_MPSAFE flags the same,
180 * untill we're ready to remove all traces of Giant from sysctl(9).
182 if ((oid->oid_kind & CTLFLAG_NEEDGIANT) ||
183 (!(oid->oid_kind & CTLFLAG_MPSAFE)))
185 error = oid->oid_handler(oid, arg1, arg2, req);
186 if ((oid->oid_kind & CTLFLAG_NEEDGIANT) ||
187 (!(oid->oid_kind & CTLFLAG_MPSAFE)))
190 KFAIL_POINT_ERROR(_debug_fail_point, sysctl_running, error);
193 SYSCTL_RLOCK(tracker);
197 if (oid->oid_kind & CTLFLAG_DYN) {
198 if (atomic_fetchadd_int(&oid->oid_running, -1) == 1 &&
199 (oid->oid_kind & CTLFLAG_DYING) != 0)
200 wakeup(&oid->oid_running);
207 sysctl_load_tunable_by_oid_locked(struct sysctl_oid *oidp)
209 struct sysctl_req req;
210 struct sysctl_oid *curr;
213 ssize_t rem = sizeof(path);
215 uint8_t data[512] __aligned(sizeof(uint64_t));
221 for (curr = oidp; curr != NULL; curr = SYSCTL_PARENT(curr)) {
222 len = strlen(curr->oid_name);
227 printf("OID path exceeds %d bytes\n", (int)sizeof(path));
230 memcpy(path + rem, curr->oid_name, len);
232 path[rem + len] = '.';
235 memset(&req, 0, sizeof(req));
238 req.oldfunc = sysctl_old_kernel;
239 req.newfunc = sysctl_new_kernel;
240 req.lock = REQ_UNWIRED;
242 switch (oidp->oid_kind & CTLTYPE) {
244 if (getenv_array(path + rem, data, sizeof(data), &size,
245 sizeof(int), GETENV_SIGNED) == 0)
251 if (getenv_array(path + rem, data, sizeof(data), &size,
252 sizeof(int), GETENV_UNSIGNED) == 0)
258 if (getenv_array(path + rem, data, sizeof(data), &size,
259 sizeof(long), GETENV_SIGNED) == 0)
265 if (getenv_array(path + rem, data, sizeof(data), &size,
266 sizeof(long), GETENV_UNSIGNED) == 0)
272 if (getenv_array(path + rem, data, sizeof(data), &size,
273 sizeof(int8_t), GETENV_SIGNED) == 0)
279 if (getenv_array(path + rem, data, sizeof(data), &size,
280 sizeof(int16_t), GETENV_SIGNED) == 0)
286 if (getenv_array(path + rem, data, sizeof(data), &size,
287 sizeof(int32_t), GETENV_SIGNED) == 0)
293 if (getenv_array(path + rem, data, sizeof(data), &size,
294 sizeof(int64_t), GETENV_SIGNED) == 0)
300 if (getenv_array(path + rem, data, sizeof(data), &size,
301 sizeof(uint8_t), GETENV_UNSIGNED) == 0)
307 if (getenv_array(path + rem, data, sizeof(data), &size,
308 sizeof(uint16_t), GETENV_UNSIGNED) == 0)
314 if (getenv_array(path + rem, data, sizeof(data), &size,
315 sizeof(uint32_t), GETENV_UNSIGNED) == 0)
321 if (getenv_array(path + rem, data, sizeof(data), &size,
322 sizeof(uint64_t), GETENV_UNSIGNED) == 0)
328 penv = kern_getenv(path + rem);
331 req.newlen = strlen(penv);
337 error = sysctl_root_handler_locked(oidp, oidp->oid_arg1,
338 oidp->oid_arg2, &req, NULL);
340 printf("Setting sysctl %s failed: %d\n", path + rem, error);
346 * Locate the path to a given oid. Returns the length of the resulting path,
347 * or -1 if the oid was not found. nodes must have room for CTL_MAXNAME
351 sysctl_search_oid(struct sysctl_oid **nodes, struct sysctl_oid *needle)
355 SYSCTL_ASSERT_LOCKED();
358 * Do a depth-first search of the oid tree, looking for 'needle'. Start
359 * with the first child of the root.
361 nodes[indx] = RB_MIN(sysctl_oid_list, &sysctl__children);
363 if (nodes[indx] == needle)
366 if (nodes[indx] == NULL) {
367 /* Node has no more siblings, so back up to parent. */
369 /* Retreat to root, so give up. */
372 } else if ((nodes[indx]->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
373 /* Node has children. */
374 if (++indx == CTL_MAXNAME) {
375 /* Max search depth reached, so give up. */
378 /* Start with the first child. */
379 nodes[indx] = RB_MIN(sysctl_oid_list,
380 &nodes[indx - 1]->oid_children);
383 /* Consider next sibling. */
384 nodes[indx] = RB_NEXT(sysctl_oid_list, NULL, nodes[indx]);
390 sysctl_warn_reuse(const char *func, struct sysctl_oid *leaf)
392 struct sysctl_oid *nodes[CTL_MAXNAME];
397 (void)sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN | SBUF_INCLUDENUL);
398 sbuf_set_drain(&sb, sbuf_printf_drain, NULL);
400 sbuf_printf(&sb, "%s: can't re-use a leaf (", __func__);
402 rc = sysctl_search_oid(nodes, leaf);
404 for (i = 0; i < rc; i++)
405 sbuf_printf(&sb, "%s%.*s", nodes[i]->oid_name,
408 sbuf_printf(&sb, "%s", leaf->oid_name);
410 sbuf_printf(&sb, ")!\n");
412 (void)sbuf_finish(&sb);
417 sysctl_reuse_test(SYSCTL_HANDLER_ARGS)
419 struct rm_priotracker tracker;
421 SYSCTL_RLOCK(&tracker);
422 sysctl_warn_reuse(__func__, oidp);
423 SYSCTL_RUNLOCK(&tracker);
426 SYSCTL_PROC(_sysctl, OID_AUTO, reuse_test,
427 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, sysctl_reuse_test, "-",
432 sysctl_register_oid(struct sysctl_oid *oidp)
434 struct sysctl_oid_list *parent = oidp->oid_parent;
435 struct sysctl_oid *p, key;
440 * First check if another oid with the same name already
441 * exists in the parent's list.
443 SYSCTL_ASSERT_WLOCKED();
444 p = sysctl_find_oidname(oidp->oid_name, parent);
446 if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
450 sysctl_warn_reuse(__func__, p);
454 /* get current OID number */
455 oid_number = oidp->oid_number;
458 #error "OID_AUTO is expected to be a negative value"
461 * Any negative OID number qualifies as OID_AUTO. Valid OID
462 * numbers should always be positive.
464 * NOTE: DO NOT change the starting value here, change it in
465 * <sys/sysctl.h>, and make sure it is at least 256 to
466 * accommodate e.g. net.inet.raw as a static sysctl node.
468 if (oid_number < 0) {
472 * By decrementing the next OID number we spend less
473 * time inserting the OIDs into a sorted list.
475 if (--newoid < CTL_AUTO_START)
482 * Insert the OID into the parent's list sorted by OID number.
484 key.oid_number = oid_number;
485 p = RB_NFIND(sysctl_oid_list, parent, &key);
486 while (p != NULL && oid_number == p->oid_number) {
487 /* get the next valid OID number */
488 if (oid_number < CTL_AUTO_START ||
489 oid_number == 0x7fffffff) {
490 /* wraparound - restart */
491 oid_number = CTL_AUTO_START;
492 /* don't loop forever */
494 panic("sysctl: Out of OID numbers\n");
495 key.oid_number = oid_number;
496 p = RB_NFIND(sysctl_oid_list, parent, &key);
499 p = RB_NEXT(sysctl_oid_list, NULL, p);
502 /* check for non-auto OID number collision */
503 if (oidp->oid_number >= 0 && oidp->oid_number < CTL_AUTO_START &&
504 oid_number >= CTL_AUTO_START) {
505 printf("sysctl: OID number(%d) is already in use for '%s'\n",
506 oidp->oid_number, oidp->oid_name);
508 /* update the OID number, if any */
509 oidp->oid_number = oid_number;
510 RB_INSERT(sysctl_oid_list, parent, oidp);
512 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE &&
514 (oidp->oid_kind & CTLFLAG_VNET) == 0 &&
516 (oidp->oid_kind & CTLFLAG_TUN) != 0 &&
517 (oidp->oid_kind & CTLFLAG_NOFETCH) == 0) {
518 /* only fetch value once */
519 oidp->oid_kind |= CTLFLAG_NOFETCH;
520 /* try to fetch value from kernel environment */
521 sysctl_load_tunable_by_oid_locked(oidp);
526 sysctl_register_disabled_oid(struct sysctl_oid *oidp)
530 * Mark the leaf as dormant if it's not to be immediately enabled.
531 * We do not disable nodes as they can be shared between modules
532 * and it is always safe to access a node.
534 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) == 0,
535 ("internal flag is set in oid_kind"));
536 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
537 oidp->oid_kind |= CTLFLAG_DORMANT;
538 sysctl_register_oid(oidp);
542 sysctl_enable_oid(struct sysctl_oid *oidp)
545 SYSCTL_ASSERT_WLOCKED();
546 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
547 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) == 0,
548 ("sysctl node is marked as dormant"));
551 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) != 0,
552 ("enabling already enabled sysctl oid"));
553 oidp->oid_kind &= ~CTLFLAG_DORMANT;
557 sysctl_unregister_oid(struct sysctl_oid *oidp)
561 SYSCTL_ASSERT_WLOCKED();
562 if (oidp->oid_number == OID_AUTO) {
566 if (RB_REMOVE(sysctl_oid_list, oidp->oid_parent, oidp))
571 * This can happen when a module fails to register and is
572 * being unloaded afterwards. It should not be a panic()
576 printf("%s: failed(%d) to unregister sysctl(%s)\n",
577 __func__, error, oidp->oid_name);
581 /* Initialize a new context to keep track of dynamically added sysctls. */
583 sysctl_ctx_init(struct sysctl_ctx_list *c)
591 * No locking here, the caller is responsible for not adding
592 * new nodes to a context until after this function has
599 /* Free the context, and destroy all dynamic oids registered in this context */
601 sysctl_ctx_free(struct sysctl_ctx_list *clist)
603 struct sysctl_ctx_entry *e, *e1;
608 * First perform a "dry run" to check if it's ok to remove oids.
610 * XXX This algorithm is a hack. But I don't know any
611 * XXX better solution for now...
614 TAILQ_FOREACH(e, clist, link) {
615 error = sysctl_remove_oid_locked(e->entry, 0, 0);
620 * Restore deregistered entries, either from the end,
621 * or from the place where error occurred.
622 * e contains the entry that was not unregistered
625 e1 = TAILQ_PREV(e, sysctl_ctx_list, link);
627 e1 = TAILQ_LAST(clist, sysctl_ctx_list);
629 sysctl_register_oid(e1->entry);
630 e1 = TAILQ_PREV(e1, sysctl_ctx_list, link);
636 /* Now really delete the entries */
637 e = TAILQ_FIRST(clist);
639 e1 = TAILQ_NEXT(e, link);
640 error = sysctl_remove_oid_locked(e->entry, 1, 0);
642 panic("sysctl_remove_oid: corrupt tree, entry: %s",
644 free(e, M_SYSCTLOID);
651 /* Add an entry to the context */
652 struct sysctl_ctx_entry *
653 sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
655 struct sysctl_ctx_entry *e;
657 SYSCTL_ASSERT_WLOCKED();
658 if (clist == NULL || oidp == NULL)
660 e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK);
662 TAILQ_INSERT_HEAD(clist, e, link);
666 /* Find an entry in the context */
667 struct sysctl_ctx_entry *
668 sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
670 struct sysctl_ctx_entry *e;
672 SYSCTL_ASSERT_WLOCKED();
673 if (clist == NULL || oidp == NULL)
675 TAILQ_FOREACH(e, clist, link) {
676 if (e->entry == oidp)
683 * Delete an entry from the context.
684 * NOTE: this function doesn't free oidp! You have to remove it
685 * with sysctl_remove_oid().
688 sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
690 struct sysctl_ctx_entry *e;
692 if (clist == NULL || oidp == NULL)
695 e = sysctl_ctx_entry_find(clist, oidp);
697 TAILQ_REMOVE(clist, e, link);
699 free(e, M_SYSCTLOID);
708 * Remove dynamically created sysctl trees.
709 * oidp - top of the tree to be removed
710 * del - if 0 - just deregister, otherwise free up entries as well
711 * recurse - if != 0 traverse the subtree to be deleted
714 sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse)
719 error = sysctl_remove_oid_locked(oidp, del, recurse);
725 sysctl_remove_name(struct sysctl_oid *parent, const char *name,
726 int del, int recurse)
728 struct sysctl_oid *p;
733 p = sysctl_find_oidname(name, &parent->oid_children);
735 error = sysctl_remove_oid_locked(p, del, recurse);
742 * Duplicate the provided string, escaping any illegal characters. The result
743 * must be freed when no longer in use.
745 * The list of illegal characters is ".".
748 sysctl_escape_name(const char* orig)
750 int i, s = 0, d = 0, nillegals = 0;
753 /* First count the number of illegal characters */
754 for (i = 0; orig[i] != '\0'; i++) {
759 /* Allocate storage for new string */
760 new = malloc(i + 2 * nillegals + 1, M_SYSCTLOID, M_WAITOK);
762 /* Copy the name, escaping characters as we go */
763 while (orig[s] != '\0') {
764 if (orig[s] == '.') {
765 /* %25 is the hexadecimal representation of '.' */
771 new[d++] = orig[s++];
775 /* Finally, nul-terminate */
782 sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, int recurse)
784 struct sysctl_oid *p, *tmp;
787 SYSCTL_ASSERT_WLOCKED();
790 if ((oidp->oid_kind & CTLFLAG_DYN) == 0) {
791 printf("Warning: can't remove non-dynamic nodes (%s)!\n",
796 * WARNING: normal method to do this should be through
797 * sysctl_ctx_free(). Use recursing as the last resort
798 * method to purge your sysctl tree of leftovers...
799 * However, if some other code still references these nodes,
802 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
803 if (oidp->oid_refcnt == 1) {
804 for(p = RB_MIN(sysctl_oid_list, &oidp->oid_children);
805 p != NULL; p = tmp) {
807 printf("Warning: failed attempt to "
808 "remove oid %s with child %s\n",
809 oidp->oid_name, p->oid_name);
812 tmp = RB_NEXT(sysctl_oid_list,
813 &oidp->oid_children, p);
814 error = sysctl_remove_oid_locked(p, del,
821 if (oidp->oid_refcnt > 1 ) {
824 if (oidp->oid_refcnt == 0) {
825 printf("Warning: bad oid_refcnt=%u (%s)!\n",
826 oidp->oid_refcnt, oidp->oid_name);
829 sysctl_unregister_oid(oidp);
832 * Wait for all threads running the handler to drain.
833 * This preserves the previous behavior when the
834 * sysctl lock was held across a handler invocation,
835 * and is necessary for module unload correctness.
837 while (oidp->oid_running > 0) {
838 oidp->oid_kind |= CTLFLAG_DYING;
839 SYSCTL_SLEEP(&oidp->oid_running, "oidrm", 0);
842 free(__DECONST(char *, oidp->oid_descr),
845 free(__DECONST(char *, oidp->oid_label),
847 free(__DECONST(char *, oidp->oid_name), M_SYSCTLOID);
848 free(oidp, M_SYSCTLOID);
854 * Create new sysctls at run time.
855 * clist may point to a valid context initialized with sysctl_ctx_init().
858 sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent,
859 int number, const char *name, int kind, void *arg1, intmax_t arg2,
860 int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr,
863 struct sysctl_oid *oidp;
866 /* You have to hook up somewhere.. */
869 escaped = sysctl_escape_name(name);
870 /* Check if the node already exists, otherwise create it */
872 oidp = sysctl_find_oidname(escaped, parent);
874 free(escaped, M_SYSCTLOID);
875 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
877 /* Update the context */
879 sysctl_ctx_entry_add(clist, oidp);
883 sysctl_warn_reuse(__func__, oidp);
888 oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO);
889 oidp->oid_parent = parent;
890 RB_INIT(&oidp->oid_children);
891 oidp->oid_number = number;
892 oidp->oid_refcnt = 1;
893 oidp->oid_name = escaped;
894 oidp->oid_handler = handler;
895 oidp->oid_kind = CTLFLAG_DYN | kind;
896 oidp->oid_arg1 = arg1;
897 oidp->oid_arg2 = arg2;
900 oidp->oid_descr = strdup(descr, M_SYSCTLOID);
902 oidp->oid_label = strdup(label, M_SYSCTLOID);
903 /* Update the context, if used */
905 sysctl_ctx_entry_add(clist, oidp);
906 /* Register this oid */
907 sysctl_register_oid(oidp);
913 * Rename an existing oid.
916 sysctl_rename_oid(struct sysctl_oid *oidp, const char *name)
921 newname = strdup(name, M_SYSCTLOID);
923 oldname = __DECONST(char *, oidp->oid_name);
924 oidp->oid_name = newname;
926 free(oldname, M_SYSCTLOID);
930 * Reparent an existing oid.
933 sysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent)
935 struct sysctl_oid *oidp;
938 if (oid->oid_parent == parent) {
942 oidp = sysctl_find_oidname(oid->oid_name, parent);
947 sysctl_unregister_oid(oid);
948 oid->oid_parent = parent;
949 oid->oid_number = OID_AUTO;
950 sysctl_register_oid(oid);
956 * Register the kernel's oids on startup.
958 SET_DECLARE(sysctl_set, struct sysctl_oid);
961 sysctl_register_all(void *arg)
963 struct sysctl_oid **oidp;
965 sx_init(&sysctlmemlock, "sysctl mem");
966 sx_init(&sysctlstringlock, "sysctl string handler");
969 SET_FOREACH(oidp, sysctl_set)
970 sysctl_register_oid(*oidp);
973 SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_FIRST, sysctl_register_all, NULL);
978 * These functions implement a presently undocumented interface
979 * used by the sysctl program to walk the tree, and get the type
980 * so it can print the value.
981 * This interface is under work and consideration, and should probably
982 * be killed with a big axe by the first person who can find the time.
983 * (be aware though, that the proper interface isn't as obvious as it
984 * may seem, there are various conflicting requirements.
986 * {CTL_SYSCTL, CTL_SYSCTL_DEBUG} printf the entire MIB-tree.
987 * {CTL_SYSCTL, CTL_SYSCTL_NAME, ...} return the name of the "..."
989 * {CTL_SYSCTL, CTL_SYSCTL_NEXT, ...} return the next OID, honoring
991 * {CTL_SYSCTL, CTL_SYSCTL_NAME2OID} return the OID of the name in
993 * {CTL_SYSCTL, CTL_SYSCTL_OIDFMT, ...} return the kind & format info
995 * {CTL_SYSCTL, CTL_SYSCTL_OIDDESCR, ...} return the description of the
997 * {CTL_SYSCTL, CTL_SYSCTL_OIDLABEL, ...} return the aggregation label of
999 * {CTL_SYSCTL, CTL_SYSCTL_NEXTNOSKIP, ...} return the next OID, ignoring
1005 sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i)
1008 struct sysctl_oid *oidp;
1010 SYSCTL_ASSERT_LOCKED();
1011 SYSCTL_FOREACH(oidp, l) {
1015 printf("%d %s ", oidp->oid_number, oidp->oid_name);
1018 oidp->oid_kind & CTLFLAG_RD ? 'R':' ',
1019 oidp->oid_kind & CTLFLAG_WR ? 'W':' ');
1021 if (oidp->oid_handler)
1022 printf(" *Handler");
1024 switch (oidp->oid_kind & CTLTYPE) {
1027 if (!oidp->oid_handler) {
1028 sysctl_sysctl_debug_dump_node(
1029 SYSCTL_CHILDREN(oidp), i + 2);
1032 case CTLTYPE_INT: printf(" Int\n"); break;
1033 case CTLTYPE_UINT: printf(" u_int\n"); break;
1034 case CTLTYPE_LONG: printf(" Long\n"); break;
1035 case CTLTYPE_ULONG: printf(" u_long\n"); break;
1036 case CTLTYPE_STRING: printf(" String\n"); break;
1037 case CTLTYPE_S8: printf(" int8_t\n"); break;
1038 case CTLTYPE_S16: printf(" int16_t\n"); break;
1039 case CTLTYPE_S32: printf(" int32_t\n"); break;
1040 case CTLTYPE_S64: printf(" int64_t\n"); break;
1041 case CTLTYPE_U8: printf(" uint8_t\n"); break;
1042 case CTLTYPE_U16: printf(" uint16_t\n"); break;
1043 case CTLTYPE_U32: printf(" uint32_t\n"); break;
1044 case CTLTYPE_U64: printf(" uint64_t\n"); break;
1045 case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
1046 default: printf("\n");
1052 sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS)
1054 struct rm_priotracker tracker;
1057 error = priv_check(req->td, PRIV_SYSCTL_DEBUG);
1060 SYSCTL_RLOCK(&tracker);
1061 sysctl_sysctl_debug_dump_node(&sysctl__children, 0);
1062 SYSCTL_RUNLOCK(&tracker);
1066 SYSCTL_PROC(_sysctl, CTL_SYSCTL_DEBUG, debug, CTLTYPE_STRING | CTLFLAG_RD |
1067 CTLFLAG_MPSAFE, 0, 0, sysctl_sysctl_debug, "-", "");
1071 sysctl_sysctl_name(SYSCTL_HANDLER_ARGS)
1073 int *name = (int *) arg1;
1074 u_int namelen = arg2;
1076 struct sysctl_oid *oid, key;
1077 struct sysctl_oid_list *lsp = &sysctl__children, *lsp2;
1078 struct rm_priotracker tracker;
1081 error = sysctl_wire_old_buffer(req, 0);
1085 SYSCTL_RLOCK(&tracker);
1088 snprintf(buf,sizeof(buf),"%d",*name);
1090 error = SYSCTL_OUT(req, ".", 1);
1092 error = SYSCTL_OUT(req, buf, strlen(buf));
1100 key.oid_number = *name;
1101 oid = RB_FIND(sysctl_oid_list, lsp, &key);
1104 error = SYSCTL_OUT(req, ".", 1);
1106 error = SYSCTL_OUT(req, oid->oid_name,
1107 strlen(oid->oid_name));
1114 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE &&
1116 lsp2 = SYSCTL_CHILDREN(oid);
1120 error = SYSCTL_OUT(req, "", 1);
1122 SYSCTL_RUNLOCK(&tracker);
1127 * XXXRW/JA: Shouldn't return name data for nodes that we don't permit in
1130 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NAME, name, CTLFLAG_RD |
1131 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_name, "");
1133 enum sysctl_iter_action {
1134 ITER_SIBLINGS, /* Not matched, continue iterating siblings */
1135 ITER_CHILDREN, /* Node has children we need to iterate over them */
1136 ITER_FOUND, /* Matching node was found */
1140 * Tries to find the next node for @name and @namelen.
1142 * Returns next action to take.
1144 static enum sysctl_iter_action
1145 sysctl_sysctl_next_node(struct sysctl_oid *oidp, int *name, unsigned int namelen,
1149 if ((oidp->oid_kind & CTLFLAG_DORMANT) != 0)
1150 return (ITER_SIBLINGS);
1152 if (honor_skip && (oidp->oid_kind & CTLFLAG_SKIP) != 0)
1153 return (ITER_SIBLINGS);
1157 * We have reached a node with a full name match and are
1158 * looking for the next oid in its children.
1160 * For CTL_SYSCTL_NEXTNOSKIP we are done.
1162 * For CTL_SYSCTL_NEXT we skip CTLTYPE_NODE (unless it
1163 * has a handler) and move on to the children.
1166 return (ITER_FOUND);
1167 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1168 return (ITER_FOUND);
1169 /* If node does not have an iterator, treat it as leaf */
1170 if (oidp->oid_handler)
1171 return (ITER_FOUND);
1173 /* Report oid as a node to iterate */
1174 return (ITER_CHILDREN);
1178 * No match yet. Continue seeking the given name.
1180 * We are iterating in order by oid_number, so skip oids lower
1181 * than the one we are looking for.
1183 * When the current oid_number is higher than the one we seek,
1184 * that means we have reached the next oid in the sequence and
1187 * If the oid_number matches the name at this level then we
1188 * have to find a node to continue searching at the next level.
1190 if (oidp->oid_number < *name)
1191 return (ITER_SIBLINGS);
1192 if (oidp->oid_number > *name) {
1194 * We have reached the next oid.
1196 * For CTL_SYSCTL_NEXTNOSKIP we are done.
1198 * For CTL_SYSCTL_NEXT we skip CTLTYPE_NODE (unless it
1199 * has a handler) and move on to the children.
1202 return (ITER_FOUND);
1203 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1204 return (ITER_FOUND);
1205 /* If node does not have an iterator, treat it as leaf */
1206 if (oidp->oid_handler)
1207 return (ITER_FOUND);
1208 return (ITER_CHILDREN);
1211 /* match at a current level */
1212 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1213 return (ITER_SIBLINGS);
1214 if (oidp->oid_handler)
1215 return (ITER_SIBLINGS);
1217 return (ITER_CHILDREN);
1221 * Recursively walk the sysctl subtree at lsp until we find the given name.
1222 * Returns true and fills in next oid data in @next and @len if oid is found.
1225 sysctl_sysctl_next_action(struct sysctl_oid_list *lsp, int *name, u_int namelen,
1226 int *next, int *len, int level, bool honor_skip)
1228 struct sysctl_oid_list *next_lsp;
1229 struct sysctl_oid *oidp = NULL, key;
1230 bool success = false;
1231 enum sysctl_iter_action action;
1233 SYSCTL_ASSERT_LOCKED();
1235 * Start the search at the requested oid. But if not found, then scan
1236 * through all children.
1239 key.oid_number = *name;
1240 oidp = RB_FIND(sysctl_oid_list, lsp, &key);
1243 oidp = RB_MIN(sysctl_oid_list, lsp);
1244 for(; oidp != NULL; oidp = RB_NEXT(sysctl_oid_list, lsp, oidp)) {
1245 action = sysctl_sysctl_next_node(oidp, name, namelen,
1247 if (action == ITER_SIBLINGS)
1249 if (action == ITER_FOUND) {
1253 KASSERT((action== ITER_CHILDREN), ("ret(%d)!=ITER_CHILDREN", action));
1255 next_lsp = SYSCTL_CHILDREN(oidp);
1257 success = sysctl_sysctl_next_action(next_lsp, NULL, 0,
1258 next + 1, len, level + 1, honor_skip);
1260 success = sysctl_sysctl_next_action(next_lsp, name + 1,
1261 namelen - 1, next + 1, len, level + 1, honor_skip);
1265 * We maintain the invariant that current node oid
1266 * is >= the oid provided in @name.
1267 * As there are no usable children at this node,
1268 * current node oid is strictly > than the requested
1270 * Hence, reduce namelen to 0 to allow for picking first
1271 * nodes/leafs in the next node in list.
1281 *next = oidp->oid_number;
1290 sysctl_sysctl_next(SYSCTL_HANDLER_ARGS)
1292 int *name = (int *) arg1;
1293 u_int namelen = arg2;
1296 struct sysctl_oid_list *lsp = &sysctl__children;
1297 struct rm_priotracker tracker;
1298 int next[CTL_MAXNAME];
1301 SYSCTL_RLOCK(&tracker);
1302 success = sysctl_sysctl_next_action(lsp, name, namelen, next, &len, 1,
1303 oidp->oid_number == CTL_SYSCTL_NEXT);
1304 SYSCTL_RUNLOCK(&tracker);
1307 error = SYSCTL_OUT(req, next, len * sizeof (int));
1312 * XXXRW/JA: Shouldn't return next data for nodes that we don't permit in
1315 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NEXT, next, CTLFLAG_RD |
1316 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_next, "");
1318 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NEXTNOSKIP, nextnoskip, CTLFLAG_RD |
1319 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_next, "");
1322 name2oid(char *name, int *oid, int *len, struct sysctl_oid **oidpp)
1324 struct sysctl_oid *oidp;
1325 struct sysctl_oid_list *lsp = &sysctl__children;
1327 SYSCTL_ASSERT_LOCKED();
1329 for (*len = 0; *len < CTL_MAXNAME;) {
1330 oidp = sysctl_find_oidname(strsep(&name, "."), lsp);
1333 *oid++ = oidp->oid_number;
1336 if (name == NULL || *name == '\0') {
1342 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1345 if (oidp->oid_handler)
1348 lsp = SYSCTL_CHILDREN(oidp);
1354 sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS)
1357 int error, oid[CTL_MAXNAME], len = 0;
1358 struct sysctl_oid *op = NULL;
1359 struct rm_priotracker tracker;
1364 if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */
1365 return (ENAMETOOLONG);
1368 if (req->newlen >= sizeof(buf))
1369 p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK);
1371 error = SYSCTL_IN(req, p, req->newlen);
1378 p [req->newlen] = '\0';
1380 SYSCTL_RLOCK(&tracker);
1381 error = name2oid(p, oid, &len, &op);
1382 SYSCTL_RUNLOCK(&tracker);
1390 error = SYSCTL_OUT(req, oid, len * sizeof *oid);
1395 * XXXRW/JA: Shouldn't return name2oid data for nodes that we don't permit in
1398 SYSCTL_PROC(_sysctl, CTL_SYSCTL_NAME2OID, name2oid, CTLTYPE_INT | CTLFLAG_RW |
1399 CTLFLAG_ANYBODY | CTLFLAG_MPSAFE | CTLFLAG_CAPRW, 0, 0,
1400 sysctl_sysctl_name2oid, "I", "");
1403 sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS)
1405 struct sysctl_oid *oid;
1406 struct rm_priotracker tracker;
1409 error = sysctl_wire_old_buffer(req, 0);
1413 SYSCTL_RLOCK(&tracker);
1414 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
1418 if (oid->oid_fmt == NULL) {
1422 error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind));
1425 error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1);
1427 SYSCTL_RUNLOCK(&tracker);
1431 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDFMT, oidfmt, CTLFLAG_RD |
1432 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidfmt, "");
1435 sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS)
1437 struct sysctl_oid *oid;
1438 struct rm_priotracker tracker;
1441 error = sysctl_wire_old_buffer(req, 0);
1445 SYSCTL_RLOCK(&tracker);
1446 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
1450 if (oid->oid_descr == NULL) {
1454 error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1);
1456 SYSCTL_RUNLOCK(&tracker);
1460 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDDESCR, oiddescr, CTLFLAG_RD |
1461 CTLFLAG_MPSAFE|CTLFLAG_CAPRD, sysctl_sysctl_oiddescr, "");
1464 sysctl_sysctl_oidlabel(SYSCTL_HANDLER_ARGS)
1466 struct sysctl_oid *oid;
1467 struct rm_priotracker tracker;
1470 error = sysctl_wire_old_buffer(req, 0);
1474 SYSCTL_RLOCK(&tracker);
1475 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
1479 if (oid->oid_label == NULL) {
1483 error = SYSCTL_OUT(req, oid->oid_label, strlen(oid->oid_label) + 1);
1485 SYSCTL_RUNLOCK(&tracker);
1489 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDLABEL, oidlabel, CTLFLAG_RD |
1490 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidlabel, "");
1493 * Default "handler" functions.
1499 * a variable: point arg1 at it.
1500 * a constant: pass it in arg2.
1504 sysctl_handle_bool(SYSCTL_HANDLER_ARGS)
1510 * Attempt to get a coherent snapshot by making a copy of the data.
1513 temp = *(bool *)arg1 ? 1 : 0;
1515 temp = arg2 ? 1 : 0;
1517 error = SYSCTL_OUT(req, &temp, sizeof(temp));
1518 if (error || !req->newptr)
1524 error = SYSCTL_IN(req, &temp, sizeof(temp));
1526 *(bool *)arg1 = temp ? 1 : 0;
1532 * Handle an int8_t, signed or unsigned.
1534 * a variable: point arg1 at it.
1535 * a constant: pass it in arg2.
1539 sysctl_handle_8(SYSCTL_HANDLER_ARGS)
1545 * Attempt to get a coherent snapshot by making a copy of the data.
1548 tmpout = *(int8_t *)arg1;
1551 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout));
1553 if (error || !req->newptr)
1559 error = SYSCTL_IN(req, arg1, sizeof(tmpout));
1564 * Handle an int16_t, signed or unsigned.
1566 * a variable: point arg1 at it.
1567 * a constant: pass it in arg2.
1571 sysctl_handle_16(SYSCTL_HANDLER_ARGS)
1577 * Attempt to get a coherent snapshot by making a copy of the data.
1580 tmpout = *(int16_t *)arg1;
1583 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout));
1585 if (error || !req->newptr)
1591 error = SYSCTL_IN(req, arg1, sizeof(tmpout));
1596 * Handle an int32_t, signed or unsigned.
1598 * a variable: point arg1 at it.
1599 * a constant: pass it in arg2.
1603 sysctl_handle_32(SYSCTL_HANDLER_ARGS)
1609 * Attempt to get a coherent snapshot by making a copy of the data.
1612 tmpout = *(int32_t *)arg1;
1615 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout));
1617 if (error || !req->newptr)
1623 error = SYSCTL_IN(req, arg1, sizeof(tmpout));
1628 * Handle an int, signed or unsigned.
1630 * a variable: point arg1 at it.
1631 * a constant: pass it in arg2.
1635 sysctl_handle_int(SYSCTL_HANDLER_ARGS)
1637 int tmpout, error = 0;
1640 * Attempt to get a coherent snapshot by making a copy of the data.
1643 tmpout = *(int *)arg1;
1646 error = SYSCTL_OUT(req, &tmpout, sizeof(int));
1648 if (error || !req->newptr)
1654 error = SYSCTL_IN(req, arg1, sizeof(int));
1659 * Based on sysctl_handle_int() convert milliseconds into ticks.
1660 * Note: this is used by TCP.
1664 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS)
1669 s = (int)((int64_t)tt * 1000 / hz);
1671 error = sysctl_handle_int(oidp, &s, 0, req);
1672 if (error || !req->newptr)
1675 tt = (int)((int64_t)s * hz / 1000);
1684 * Handle a long, signed or unsigned.
1686 * a variable: point arg1 at it.
1687 * a constant: pass it in arg2.
1691 sysctl_handle_long(SYSCTL_HANDLER_ARGS)
1700 * Attempt to get a coherent snapshot by making a copy of the data.
1703 tmplong = *(long *)arg1;
1707 if (req->flags & SCTL_MASK32) {
1709 error = SYSCTL_OUT(req, &tmpint, sizeof(int));
1712 error = SYSCTL_OUT(req, &tmplong, sizeof(long));
1714 if (error || !req->newptr)
1720 else if (req->flags & SCTL_MASK32) {
1721 error = SYSCTL_IN(req, &tmpint, sizeof(int));
1722 *(long *)arg1 = (long)tmpint;
1726 error = SYSCTL_IN(req, arg1, sizeof(long));
1731 * Handle a 64 bit int, signed or unsigned.
1733 * a variable: point arg1 at it.
1734 * a constant: pass it in arg2.
1737 sysctl_handle_64(SYSCTL_HANDLER_ARGS)
1743 * Attempt to get a coherent snapshot by making a copy of the data.
1746 tmpout = *(uint64_t *)arg1;
1749 error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t));
1751 if (error || !req->newptr)
1757 error = SYSCTL_IN(req, arg1, sizeof(uint64_t));
1762 * Handle our generic '\0' terminated 'C' string.
1764 * a variable string: point arg1 at it, arg2 is max length.
1765 * a constant string: point arg1 at it, arg2 is zero.
1769 sysctl_handle_string(SYSCTL_HANDLER_ARGS)
1773 int error = 0, ro_string = 0;
1776 * If the sysctl isn't writable and isn't a preallocated tunable that
1777 * can be modified by kenv(2), microoptimise and treat it as a
1779 * A zero-length buffer indicates a fixed size read-only
1780 * string. In ddb, don't worry about trying to make a malloced
1783 if ((oidp->oid_kind & (CTLFLAG_WR | CTLFLAG_TUN)) == 0 ||
1784 arg2 == 0 || kdb_active) {
1785 arg2 = strlen((char *)arg1) + 1;
1789 if (req->oldptr != NULL) {
1792 outlen = strlen(tmparg) + 1;
1794 tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK);
1795 sx_slock(&sysctlstringlock);
1796 memcpy(tmparg, arg1, arg2);
1797 sx_sunlock(&sysctlstringlock);
1798 outlen = strlen(tmparg) + 1;
1801 error = SYSCTL_OUT(req, tmparg, outlen);
1804 free(tmparg, M_SYSCTLTMP);
1807 sx_slock(&sysctlstringlock);
1808 outlen = strlen((char *)arg1) + 1;
1810 sx_sunlock(&sysctlstringlock);
1811 error = SYSCTL_OUT(req, NULL, outlen);
1813 if (error || !req->newptr)
1816 if (req->newlen - req->newidx >= arg2 ||
1817 req->newlen - req->newidx < 0) {
1819 } else if (req->newlen - req->newidx == 0) {
1820 sx_xlock(&sysctlstringlock);
1821 ((char *)arg1)[0] = '\0';
1822 sx_xunlock(&sysctlstringlock);
1823 } else if (req->newfunc == sysctl_new_kernel) {
1824 arg2 = req->newlen - req->newidx;
1825 sx_xlock(&sysctlstringlock);
1826 error = SYSCTL_IN(req, arg1, arg2);
1828 ((char *)arg1)[arg2] = '\0';
1829 req->newidx += arg2;
1831 sx_xunlock(&sysctlstringlock);
1833 arg2 = req->newlen - req->newidx;
1834 tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK);
1836 error = SYSCTL_IN(req, tmparg, arg2);
1838 free(tmparg, M_SYSCTLTMP);
1842 sx_xlock(&sysctlstringlock);
1843 memcpy(arg1, tmparg, arg2);
1844 ((char *)arg1)[arg2] = '\0';
1845 sx_xunlock(&sysctlstringlock);
1846 free(tmparg, M_SYSCTLTMP);
1847 req->newidx += arg2;
1853 * Handle any kind of opaque data.
1854 * arg1 points to it, arg2 is the size.
1858 sysctl_handle_opaque(SYSCTL_HANDLER_ARGS)
1862 struct sysctl_req req2;
1865 * Attempt to get a coherent snapshot, by using the thread
1866 * pre-emption counter updated from within mi_switch() to
1867 * determine if we were pre-empted during a bcopy() or
1868 * copyout(). Make 3 attempts at doing this before giving up.
1869 * If we encounter an error, stop immediately.
1874 generation = curthread->td_generation;
1875 error = SYSCTL_OUT(req, arg1, arg2);
1879 if (generation != curthread->td_generation && tries < 3) {
1884 error = SYSCTL_IN(req, arg1, arg2);
1890 * Based on sysctl_handle_64() convert microseconds to a sbintime.
1893 sysctl_usec_to_sbintime(SYSCTL_HANDLER_ARGS)
1898 usec = sbttous(*(sbintime_t *)arg1);
1900 error = sysctl_handle_64(oidp, &usec, 0, req);
1901 if (error || !req->newptr)
1904 *(sbintime_t *)arg1 = ustosbt(usec);
1910 * Based on sysctl_handle_64() convert milliseconds to a sbintime.
1913 sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS)
1918 msec = sbttoms(*(sbintime_t *)arg1);
1920 error = sysctl_handle_64(oidp, &msec, 0, req);
1921 if (error || !req->newptr)
1924 *(sbintime_t *)arg1 = mstosbt(msec);
1930 * Convert seconds to a struct timeval. Intended for use with
1931 * intervals and thus does not permit negative seconds.
1934 sysctl_sec_to_timeval(SYSCTL_HANDLER_ARGS)
1942 error = sysctl_handle_int(oidp, &secs, 0, req);
1943 if (error || req->newptr == NULL)
1954 * Transfer functions to/from kernel space.
1955 * XXX: rather untested at this point
1958 sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l)
1964 if (req->oldlen <= req->oldidx)
1967 if (i > req->oldlen - req->oldidx)
1968 i = req->oldlen - req->oldidx;
1970 bcopy(p, (char *)req->oldptr + req->oldidx, i);
1973 if (req->oldptr && i != l)
1979 sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l)
1983 if (req->newlen - req->newidx < l)
1985 bcopy((const char *)req->newptr + req->newidx, p, l);
1991 kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
1992 size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags)
1995 struct sysctl_req req;
1997 bzero(&req, sizeof req);
2003 req.oldlen = *oldlenp;
2005 req.validlen = req.oldlen;
2012 req.newlen = newlen;
2016 req.oldfunc = sysctl_old_kernel;
2017 req.newfunc = sysctl_new_kernel;
2018 req.lock = REQ_UNWIRED;
2020 error = sysctl_root(0, name, namelen, &req);
2022 if (req.lock == REQ_WIRED && req.validlen > 0)
2023 vsunlock(req.oldptr, req.validlen);
2025 if (error && error != ENOMEM)
2029 if (req.oldptr && req.oldidx > req.validlen)
2030 *retval = req.validlen;
2032 *retval = req.oldidx;
2038 kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp,
2039 void *new, size_t newlen, size_t *retval, int flags)
2041 int oid[CTL_MAXNAME];
2042 size_t oidlen, plen;
2045 oid[0] = CTL_SYSCTL;
2046 oid[1] = CTL_SYSCTL_NAME2OID;
2047 oidlen = sizeof(oid);
2049 error = kernel_sysctl(td, oid, 2, oid, &oidlen,
2050 (void *)name, strlen(name), &plen, flags);
2054 error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp,
2055 new, newlen, retval, flags);
2060 * Transfer function to/from user space.
2063 sysctl_old_user(struct sysctl_req *req, const void *p, size_t l)
2065 size_t i, len, origidx;
2068 origidx = req->oldidx;
2070 if (req->oldptr == NULL)
2073 * If we have not wired the user supplied buffer and we are currently
2074 * holding locks, drop a witness warning, as it's possible that
2075 * write operations to the user page can sleep.
2077 if (req->lock != REQ_WIRED)
2078 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
2079 "sysctl_old_user()");
2081 len = req->validlen;
2085 if (i > len - origidx)
2087 if (req->lock == REQ_WIRED) {
2088 error = copyout_nofault(p, (char *)req->oldptr +
2091 error = copyout(p, (char *)req->oldptr + origidx, i);
2101 sysctl_new_user(struct sysctl_req *req, void *p, size_t l)
2107 if (req->newlen - req->newidx < l)
2109 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
2110 "sysctl_new_user()");
2111 error = copyin((const char *)req->newptr + req->newidx, p, l);
2117 * Wire the user space destination buffer. If set to a value greater than
2118 * zero, the len parameter limits the maximum amount of wired memory.
2121 sysctl_wire_old_buffer(struct sysctl_req *req, size_t len)
2126 wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen;
2128 if (req->lock != REQ_WIRED && req->oldptr &&
2129 req->oldfunc == sysctl_old_user) {
2130 if (wiredlen != 0) {
2131 ret = vslock(req->oldptr, wiredlen);
2138 req->lock = REQ_WIRED;
2139 req->validlen = wiredlen;
2145 sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
2146 int *nindx, struct sysctl_req *req)
2148 struct sysctl_oid_list *lsp;
2149 struct sysctl_oid *oid;
2150 struct sysctl_oid key;
2153 SYSCTL_ASSERT_LOCKED();
2154 lsp = &sysctl__children;
2156 while (indx < CTL_MAXNAME) {
2157 key.oid_number = name[indx];
2158 oid = RB_FIND(sysctl_oid_list, lsp, &key);
2163 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2164 if (oid->oid_handler != NULL || indx == namelen) {
2168 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0,
2169 ("%s found DYING node %p", __func__, oid));
2172 lsp = SYSCTL_CHILDREN(oid);
2173 } else if (indx == namelen) {
2174 if ((oid->oid_kind & CTLFLAG_DORMANT) != 0)
2179 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0,
2180 ("%s found DYING node %p", __func__, oid));
2190 * Traverse our tree, and find the right node, execute whatever it points
2191 * to, and return the resulting error code.
2195 sysctl_root(SYSCTL_HANDLER_ARGS)
2197 struct sysctl_oid *oid;
2198 struct rm_priotracker tracker;
2199 int error, indx, lvl;
2201 SYSCTL_RLOCK(&tracker);
2203 error = sysctl_find_oid(arg1, arg2, &oid, &indx, req);
2207 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2209 * You can't call a sysctl when it's a node, but has
2210 * no handler. Inform the user that it's a node.
2211 * The indx may or may not be the same as namelen.
2213 if (oid->oid_handler == NULL) {
2219 /* Is this sysctl writable? */
2220 if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) {
2225 KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL"));
2227 #ifdef CAPABILITY_MODE
2229 * If the process is in capability mode, then don't permit reading or
2230 * writing unless specifically granted for the node.
2232 if (IN_CAPABILITY_MODE(req->td)) {
2233 if ((req->oldptr && !(oid->oid_kind & CTLFLAG_CAPRD)) ||
2234 (req->newptr && !(oid->oid_kind & CTLFLAG_CAPWR))) {
2241 /* Is this sysctl sensitive to securelevels? */
2242 if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) {
2243 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE;
2244 error = securelevel_gt(req->td->td_ucred, lvl);
2249 /* Is this sysctl writable by only privileged users? */
2250 if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) {
2253 if (oid->oid_kind & CTLFLAG_PRISON)
2254 priv = PRIV_SYSCTL_WRITEJAIL;
2256 else if ((oid->oid_kind & CTLFLAG_VNET) &&
2257 prison_owns_vnet(req->td->td_ucred))
2258 priv = PRIV_SYSCTL_WRITEJAIL;
2261 priv = PRIV_SYSCTL_WRITE;
2262 error = priv_check(req->td, priv);
2267 if (!oid->oid_handler) {
2272 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2273 arg1 = (int *)arg1 + indx;
2276 arg1 = oid->oid_arg1;
2277 arg2 = oid->oid_arg2;
2280 error = mac_system_check_sysctl(req->td->td_ucred, oid, arg1, arg2,
2286 if ((oid->oid_kind & CTLFLAG_VNET) && arg1 != NULL)
2287 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
2289 error = sysctl_root_handler_locked(oid, arg1, arg2, req, &tracker);
2292 SYSCTL_RUNLOCK(&tracker);
2296 #ifndef _SYS_SYSPROTO_H_
2297 struct __sysctl_args {
2307 sys___sysctl(struct thread *td, struct __sysctl_args *uap)
2309 int error, i, name[CTL_MAXNAME];
2312 if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
2315 error = copyin(uap->name, &name, uap->namelen * sizeof(int));
2319 error = userland_sysctl(td, name, uap->namelen,
2320 uap->old, uap->oldlenp, 0,
2321 uap->new, uap->newlen, &j, 0);
2322 if (error && error != ENOMEM)
2325 i = copyout(&j, uap->oldlenp, sizeof(j));
2333 kern___sysctlbyname(struct thread *td, const char *oname, size_t namelen,
2334 void *old, size_t *oldlenp, void *new, size_t newlen, size_t *retval,
2335 int flags, bool inkernel)
2337 int oid[CTL_MAXNAME];
2343 if (namelen > MAXPATHLEN || namelen == 0)
2346 if (namelen > sizeof(namebuf))
2347 name = malloc(namelen, M_SYSCTL, M_WAITOK);
2348 error = copyin(oname, name, namelen);
2352 oid[0] = CTL_SYSCTL;
2353 oid[1] = CTL_SYSCTL_NAME2OID;
2354 oidlen = sizeof(oid);
2355 error = kernel_sysctl(td, oid, 2, oid, &oidlen, (void *)name, namelen,
2359 error = userland_sysctl(td, oid, *retval / sizeof(int), old, oldlenp,
2360 inkernel, new, newlen, retval, flags);
2363 if (namelen > sizeof(namebuf))
2364 free(name, M_SYSCTL);
2368 #ifndef _SYS_SYSPROTO_H_
2369 struct __sysctlbyname_args {
2379 sys___sysctlbyname(struct thread *td, struct __sysctlbyname_args *uap)
2384 error = kern___sysctlbyname(td, uap->name, uap->namelen, uap->old,
2385 uap->oldlenp, uap->new, uap->newlen, &rv, 0, 0);
2388 if (uap->oldlenp != NULL)
2389 error = copyout(&rv, uap->oldlenp, sizeof(rv));
2395 * This is used from various compatibility syscalls too. That's why name
2396 * must be in kernel space.
2399 userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
2400 size_t *oldlenp, int inkernel, const void *new, size_t newlen,
2401 size_t *retval, int flags)
2403 int error = 0, memlocked;
2404 struct sysctl_req req;
2406 bzero(&req, sizeof req);
2413 req.oldlen = *oldlenp;
2415 error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp));
2420 req.validlen = req.oldlen;
2424 req.newlen = newlen;
2428 req.oldfunc = sysctl_old_user;
2429 req.newfunc = sysctl_new_user;
2430 req.lock = REQ_UNWIRED;
2433 if (KTRPOINT(curthread, KTR_SYSCTL))
2434 ktrsysctl(name, namelen);
2437 if (req.oldptr && req.oldlen > 4 * PAGE_SIZE) {
2439 sx_xlock(&sysctlmemlock);
2441 CURVNET_SET(TD_TO_VNET(td));
2446 error = sysctl_root(0, name, namelen, &req);
2447 if (error != EAGAIN)
2449 kern_yield(PRI_USER);
2454 if (req.lock == REQ_WIRED && req.validlen > 0)
2455 vsunlock(req.oldptr, req.validlen);
2457 sx_xunlock(&sysctlmemlock);
2459 if (error && error != ENOMEM)
2463 if (req.oldptr && req.oldidx > req.validlen)
2464 *retval = req.validlen;
2466 *retval = req.oldidx;
2472 * Drain into a sysctl struct. The user buffer should be wired if a page
2473 * fault would cause issue.
2476 sbuf_sysctl_drain(void *arg, const char *data, int len)
2478 struct sysctl_req *req = arg;
2481 error = SYSCTL_OUT(req, data, len);
2482 KASSERT(error >= 0, ("Got unexpected negative value %d", error));
2483 return (error == 0 ? len : -error);
2487 sbuf_new_for_sysctl(struct sbuf *s, char *buf, int length,
2488 struct sysctl_req *req)
2491 /* Supply a default buffer size if none given. */
2492 if (buf == NULL && length == 0)
2494 s = sbuf_new(s, buf, length, SBUF_FIXEDLEN | SBUF_INCLUDENUL);
2495 sbuf_set_drain(s, sbuf_sysctl_drain, req);
2501 /* The current OID the debugger is working with */
2502 static struct sysctl_oid *g_ddb_oid;
2504 /* The current flags specified by the user */
2505 static int g_ddb_sysctl_flags;
2507 /* Check to see if the last sysctl printed */
2508 static int g_ddb_sysctl_printed;
2510 static const int ctl_sign[CTLTYPE+1] = {
2519 static const int ctl_size[CTLTYPE+1] = {
2520 [CTLTYPE_INT] = sizeof(int),
2521 [CTLTYPE_UINT] = sizeof(u_int),
2522 [CTLTYPE_LONG] = sizeof(long),
2523 [CTLTYPE_ULONG] = sizeof(u_long),
2524 [CTLTYPE_S8] = sizeof(int8_t),
2525 [CTLTYPE_S16] = sizeof(int16_t),
2526 [CTLTYPE_S32] = sizeof(int32_t),
2527 [CTLTYPE_S64] = sizeof(int64_t),
2528 [CTLTYPE_U8] = sizeof(uint8_t),
2529 [CTLTYPE_U16] = sizeof(uint16_t),
2530 [CTLTYPE_U32] = sizeof(uint32_t),
2531 [CTLTYPE_U64] = sizeof(uint64_t),
2534 #define DB_SYSCTL_NAME_ONLY 0x001 /* Compare with -N */
2535 #define DB_SYSCTL_VALUE_ONLY 0x002 /* Compare with -n */
2536 #define DB_SYSCTL_OPAQUE 0x004 /* Compare with -o */
2537 #define DB_SYSCTL_HEX 0x008 /* Compare with -x */
2539 #define DB_SYSCTL_SAFE_ONLY 0x100 /* Only simple types */
2541 static const char db_sysctl_modifs[] = {
2545 static const int db_sysctl_modif_values[] = {
2546 DB_SYSCTL_NAME_ONLY, DB_SYSCTL_VALUE_ONLY,
2547 DB_SYSCTL_OPAQUE, DB_SYSCTL_HEX,
2550 /* Handlers considered safe to print while recursing */
2551 static int (* const db_safe_handlers[])(SYSCTL_HANDLER_ARGS) = {
2559 sysctl_handle_string,
2560 sysctl_handle_opaque,
2564 * Use in place of sysctl_old_kernel to print sysctl values.
2566 * Compare to the output handling in show_var from sbin/sysctl/sysctl.c
2569 sysctl_old_ddb(struct sysctl_req *req, const void *ptr, size_t len)
2571 const u_char *val, *p;
2573 size_t intlen, slen;
2576 int sign, ctltype, hexlen, xflag, error;
2578 /* Suppress false-positive GCC uninitialized variable warnings */
2590 /* We are going to print */
2591 g_ddb_sysctl_printed = 1;
2593 xflag = g_ddb_sysctl_flags & DB_SYSCTL_HEX;
2595 ctltype = (g_ddb_oid->oid_kind & CTLTYPE);
2596 sign = ctl_sign[ctltype];
2597 intlen = ctl_size[ctltype];
2601 case CTLTYPE_STRING:
2602 db_printf("%.*s", (int) len, (const char *) p);
2618 hexlen = 2 + (intlen * CHAR_BIT + 3) / 4;
2620 while (len >= intlen) {
2624 umv = *(const u_int *)p;
2625 mv = *(const int *)p;
2629 umv = *(const u_long *)p;
2630 mv = *(const long *)p;
2634 umv = *(const uint8_t *)p;
2635 mv = *(const int8_t *)p;
2639 umv = *(const uint16_t *)p;
2640 mv = *(const int16_t *)p;
2644 umv = *(const uint32_t *)p;
2645 mv = *(const int32_t *)p;
2649 umv = *(const uint64_t *)p;
2650 mv = *(const int64_t *)p;
2654 db_printf("%s", sep1);
2656 db_printf("%#0*jx", hexlen, umv);
2658 db_printf("%ju", umv);
2659 else if (g_ddb_oid->oid_fmt[1] == 'K') {
2660 /* Kelvins are currently unsupported. */
2664 db_printf("%jd", mv);
2673 case CTLTYPE_OPAQUE:
2674 /* TODO: Support struct functions. */
2678 db_printf("Format:%s Length:%zu Dump:0x",
2679 g_ddb_oid->oid_fmt, len);
2680 while (len-- && (xflag || p < val + 16))
2681 db_printf("%02x", *p++);
2682 if (!xflag && len > 16)
2689 req->oldidx += slen;
2694 * Avoid setting new sysctl values from the debugger
2697 sysctl_new_ddb(struct sysctl_req *req, void *p, size_t l)
2703 /* Changing sysctls from the debugger is currently unsupported */
2708 * Run a sysctl handler with the DDB oldfunc and newfunc attached.
2709 * Instead of copying any output to a buffer we'll dump it right to
2713 db_sysctl(struct sysctl_oid *oidp, int *name, u_int namelen,
2714 void *old, size_t *oldlenp, size_t *retval, int flags)
2716 struct sysctl_req req;
2719 /* Setup the request */
2720 bzero(&req, sizeof req);
2721 req.td = kdb_thread;
2722 req.oldfunc = sysctl_old_ddb;
2723 req.newfunc = sysctl_new_ddb;
2724 req.lock = REQ_UNWIRED;
2726 req.oldlen = *oldlenp;
2728 req.validlen = req.oldlen;
2733 /* Setup our globals for sysctl_old_ddb */
2735 g_ddb_sysctl_flags = flags;
2736 g_ddb_sysctl_printed = 0;
2738 error = sysctl_root(0, name, namelen, &req);
2742 g_ddb_sysctl_flags = 0;
2745 if (req.oldptr && req.oldidx > req.validlen)
2746 *retval = req.validlen;
2748 *retval = req.oldidx;
2754 * Show a sysctl's name
2757 db_show_oid_name(int *oid, size_t nlen)
2759 struct sysctl_oid *oidp;
2760 int qoid[CTL_MAXNAME + 2];
2763 qoid[0] = CTL_SYSCTL;
2764 qoid[1] = CTL_SYSCTL_NAME;
2765 memcpy(qoid + 2, oid, nlen * sizeof(int));
2767 error = sysctl_find_oid(qoid, nlen + 2, &oidp, NULL, NULL);
2769 db_error("sysctl name oid");
2771 error = db_sysctl(oidp, qoid, nlen + 2, NULL, NULL, NULL, 0);
2773 db_error("sysctl name");
2777 * Check to see if an OID is safe to print from ddb.
2780 db_oid_safe(const struct sysctl_oid *oidp)
2782 for (unsigned int i = 0; i < nitems(db_safe_handlers); ++i) {
2783 if (oidp->oid_handler == db_safe_handlers[i])
2791 * Show a sysctl at a specific OID
2792 * Compare to the input handling in show_var from sbin/sysctl/sysctl.c
2795 db_show_oid(struct sysctl_oid *oidp, int *oid, size_t nlen, int flags)
2797 int error, xflag, oflag, Nflag, nflag;
2800 xflag = flags & DB_SYSCTL_HEX;
2801 oflag = flags & DB_SYSCTL_OPAQUE;
2802 nflag = flags & DB_SYSCTL_VALUE_ONLY;
2803 Nflag = flags & DB_SYSCTL_NAME_ONLY;
2805 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_OPAQUE &&
2810 db_show_oid_name(oid, nlen);
2816 db_show_oid_name(oid, nlen);
2820 if ((flags & DB_SYSCTL_SAFE_ONLY) && !db_oid_safe(oidp)) {
2821 db_printf("Skipping, unsafe to print while recursing.");
2826 /* Try once, and ask about the size */
2828 error = db_sysctl(oidp, oid, nlen,
2829 NULL, NULL, &len, flags);
2833 if (!g_ddb_sysctl_printed)
2834 /* Lie about the size */
2835 error = db_sysctl(oidp, oid, nlen,
2836 (void *) 1, &len, NULL, flags);
2844 * Show all sysctls under a specific OID
2845 * Compare to sysctl_all from sbin/sysctl/sysctl.c
2848 db_show_sysctl_all(int *oid, size_t len, int flags)
2850 struct sysctl_oid *oidp;
2851 int qoid[CTL_MAXNAME + 2], next[CTL_MAXNAME];
2854 qoid[0] = CTL_SYSCTL;
2855 qoid[1] = CTL_SYSCTL_NEXT;
2858 memcpy(&qoid[2], oid, nlen * sizeof(int));
2865 size_t nextsize = sizeof(next);
2867 error = kernel_sysctl(kdb_thread, qoid, nlen + 2,
2868 next, &nextsize, NULL, 0, &nlen, 0);
2870 if (error == ENOENT)
2873 db_error("sysctl(next)");
2876 nlen /= sizeof(int);
2878 if (nlen < (unsigned int)len)
2881 if (memcmp(&oid[0], &next[0], len * sizeof(int)) != 0)
2884 /* Find the OID in question */
2885 error = sysctl_find_oid(next, nlen, &oidp, NULL, NULL);
2889 (void)db_show_oid(oidp, next, nlen, flags | DB_SYSCTL_SAFE_ONLY);
2894 memcpy(&qoid[2 + len], &next[len], (nlen - len) * sizeof(int));
2899 * Show a sysctl by its user facing string
2902 db_sysctlbyname(char *name, int flags)
2904 struct sysctl_oid *oidp;
2905 int oid[CTL_MAXNAME];
2908 error = name2oid(name, oid, &nlen, &oidp);
2913 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2914 db_show_sysctl_all(oid, nlen, flags);
2916 error = db_show_oid(oidp, oid, nlen, flags);
2923 db_sysctl_cmd_usage(void)
2926 " sysctl [/Nnox] <sysctl> \n"
2928 " <sysctl> The name of the sysctl to show. \n"
2930 " Show a sysctl by hooking into SYSCTL_IN and SYSCTL_OUT. \n"
2931 " This will work for most sysctls, but should not be used \n"
2932 " with sysctls that are known to malloc. \n"
2934 " While recursing any \"unsafe\" sysctls will be skipped. \n"
2935 " Call sysctl directly on the sysctl to try printing the \n"
2936 " skipped sysctl. This is unsafe and may make the ddb \n"
2937 " session unusable. \n"
2940 " /N Display only the name of the sysctl. \n"
2941 " /n Display only the value of the sysctl. \n"
2942 " /o Display opaque values. \n"
2943 " /x Display the sysctl in hex. \n"
2946 "sysctl vm.v_free_min \n"
2947 "vn.v_free_min: 12669 \n"
2952 * Show a specific sysctl similar to sysctl (8).
2954 DB_COMMAND_FLAGS(sysctl, db_sysctl_cmd, CS_OWN)
2956 char name[TOK_STRING_SIZE];
2957 int error, i, t, flags;
2959 /* Parse the modifiers */
2960 t = db_read_token();
2961 if (t == tSLASH || t == tMINUS) {
2962 t = db_read_token();
2964 db_printf("Bad modifier\n");
2968 db_strcpy(modif, db_tok_string);
2976 for (i = 0; i < nitems(db_sysctl_modifs); i++) {
2977 if (strchr(modif, db_sysctl_modifs[i])) {
2978 flags |= db_sysctl_modif_values[i];
2982 /* Parse the sysctl names */
2983 t = db_read_token();
2985 db_printf("Need sysctl name\n");
2990 /* Copy the name into a temporary buffer */
2991 db_strcpy(name, db_tok_string);
2993 /* Ensure there is no trailing cruft */
2994 t = db_read_token();
2996 db_printf("Unexpected sysctl argument\n");
3001 error = db_sysctlbyname(name, flags);
3002 if (error == ENOENT) {
3003 db_printf("unknown oid: '%s'\n", db_tok_string);
3006 db_printf("%s: error: %d\n", db_tok_string, error);
3011 /* Ensure we eat all of our text */
3014 if (error == EINVAL) {
3015 db_sysctl_cmd_usage();