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 &&
513 (oidp->oid_kind & CTLFLAG_TUN) != 0 &&
514 (oidp->oid_kind & CTLFLAG_NOFETCH) == 0) {
515 /* only fetch value once */
516 oidp->oid_kind |= CTLFLAG_NOFETCH;
517 /* try to fetch value from kernel environment */
518 sysctl_load_tunable_by_oid_locked(oidp);
523 sysctl_register_disabled_oid(struct sysctl_oid *oidp)
527 * Mark the leaf as dormant if it's not to be immediately enabled.
528 * We do not disable nodes as they can be shared between modules
529 * and it is always safe to access a node.
531 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) == 0,
532 ("internal flag is set in oid_kind"));
533 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
534 oidp->oid_kind |= CTLFLAG_DORMANT;
535 sysctl_register_oid(oidp);
539 sysctl_enable_oid(struct sysctl_oid *oidp)
542 SYSCTL_ASSERT_WLOCKED();
543 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
544 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) == 0,
545 ("sysctl node is marked as dormant"));
548 KASSERT((oidp->oid_kind & CTLFLAG_DORMANT) != 0,
549 ("enabling already enabled sysctl oid"));
550 oidp->oid_kind &= ~CTLFLAG_DORMANT;
554 sysctl_unregister_oid(struct sysctl_oid *oidp)
558 SYSCTL_ASSERT_WLOCKED();
559 if (oidp->oid_number == OID_AUTO) {
563 if (RB_REMOVE(sysctl_oid_list, oidp->oid_parent, oidp))
568 * This can happen when a module fails to register and is
569 * being unloaded afterwards. It should not be a panic()
573 printf("%s: failed(%d) to unregister sysctl(%s)\n",
574 __func__, error, oidp->oid_name);
578 /* Initialize a new context to keep track of dynamically added sysctls. */
580 sysctl_ctx_init(struct sysctl_ctx_list *c)
588 * No locking here, the caller is responsible for not adding
589 * new nodes to a context until after this function has
596 /* Free the context, and destroy all dynamic oids registered in this context */
598 sysctl_ctx_free(struct sysctl_ctx_list *clist)
600 struct sysctl_ctx_entry *e, *e1;
605 * First perform a "dry run" to check if it's ok to remove oids.
607 * XXX This algorithm is a hack. But I don't know any
608 * XXX better solution for now...
611 TAILQ_FOREACH(e, clist, link) {
612 error = sysctl_remove_oid_locked(e->entry, 0, 0);
617 * Restore deregistered entries, either from the end,
618 * or from the place where error occurred.
619 * e contains the entry that was not unregistered
622 e1 = TAILQ_PREV(e, sysctl_ctx_list, link);
624 e1 = TAILQ_LAST(clist, sysctl_ctx_list);
626 sysctl_register_oid(e1->entry);
627 e1 = TAILQ_PREV(e1, sysctl_ctx_list, link);
633 /* Now really delete the entries */
634 e = TAILQ_FIRST(clist);
636 e1 = TAILQ_NEXT(e, link);
637 error = sysctl_remove_oid_locked(e->entry, 1, 0);
639 panic("sysctl_remove_oid: corrupt tree, entry: %s",
641 free(e, M_SYSCTLOID);
648 /* Add an entry to the context */
649 struct sysctl_ctx_entry *
650 sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
652 struct sysctl_ctx_entry *e;
654 SYSCTL_ASSERT_WLOCKED();
655 if (clist == NULL || oidp == NULL)
657 e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK);
659 TAILQ_INSERT_HEAD(clist, e, link);
663 /* Find an entry in the context */
664 struct sysctl_ctx_entry *
665 sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
667 struct sysctl_ctx_entry *e;
669 SYSCTL_ASSERT_WLOCKED();
670 if (clist == NULL || oidp == NULL)
672 TAILQ_FOREACH(e, clist, link) {
673 if (e->entry == oidp)
680 * Delete an entry from the context.
681 * NOTE: this function doesn't free oidp! You have to remove it
682 * with sysctl_remove_oid().
685 sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
687 struct sysctl_ctx_entry *e;
689 if (clist == NULL || oidp == NULL)
692 e = sysctl_ctx_entry_find(clist, oidp);
694 TAILQ_REMOVE(clist, e, link);
696 free(e, M_SYSCTLOID);
705 * Remove dynamically created sysctl trees.
706 * oidp - top of the tree to be removed
707 * del - if 0 - just deregister, otherwise free up entries as well
708 * recurse - if != 0 traverse the subtree to be deleted
711 sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse)
716 error = sysctl_remove_oid_locked(oidp, del, recurse);
722 sysctl_remove_name(struct sysctl_oid *parent, const char *name,
723 int del, int recurse)
725 struct sysctl_oid *p;
730 p = sysctl_find_oidname(name, &parent->oid_children);
732 error = sysctl_remove_oid_locked(p, del, recurse);
739 * Duplicate the provided string, escaping any illegal characters. The result
740 * must be freed when no longer in use.
742 * The list of illegal characters is ".".
745 sysctl_escape_name(const char* orig)
747 int i, s = 0, d = 0, nillegals = 0;
750 /* First count the number of illegal characters */
751 for (i = 0; orig[i] != '\0'; i++) {
756 /* Allocate storage for new string */
757 new = malloc(i + 2 * nillegals + 1, M_SYSCTLOID, M_WAITOK);
759 /* Copy the name, escaping characters as we go */
760 while (orig[s] != '\0') {
761 if (orig[s] == '.') {
762 /* %25 is the hexadecimal representation of '.' */
768 new[d++] = orig[s++];
772 /* Finally, nul-terminate */
779 sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, int recurse)
781 struct sysctl_oid *p, *tmp;
784 SYSCTL_ASSERT_WLOCKED();
787 if ((oidp->oid_kind & CTLFLAG_DYN) == 0) {
788 printf("Warning: can't remove non-dynamic nodes (%s)!\n",
793 * WARNING: normal method to do this should be through
794 * sysctl_ctx_free(). Use recursing as the last resort
795 * method to purge your sysctl tree of leftovers...
796 * However, if some other code still references these nodes,
799 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
800 if (oidp->oid_refcnt == 1) {
801 for(p = RB_MIN(sysctl_oid_list, &oidp->oid_children);
802 p != NULL; p = tmp) {
804 printf("Warning: failed attempt to "
805 "remove oid %s with child %s\n",
806 oidp->oid_name, p->oid_name);
809 tmp = RB_NEXT(sysctl_oid_list,
810 &oidp->oid_children, p);
811 error = sysctl_remove_oid_locked(p, del,
818 if (oidp->oid_refcnt > 1 ) {
821 if (oidp->oid_refcnt == 0) {
822 printf("Warning: bad oid_refcnt=%u (%s)!\n",
823 oidp->oid_refcnt, oidp->oid_name);
826 sysctl_unregister_oid(oidp);
829 * Wait for all threads running the handler to drain.
830 * This preserves the previous behavior when the
831 * sysctl lock was held across a handler invocation,
832 * and is necessary for module unload correctness.
834 while (oidp->oid_running > 0) {
835 oidp->oid_kind |= CTLFLAG_DYING;
836 SYSCTL_SLEEP(&oidp->oid_running, "oidrm", 0);
839 free(__DECONST(char *, oidp->oid_descr),
842 free(__DECONST(char *, oidp->oid_label),
844 free(__DECONST(char *, oidp->oid_name), M_SYSCTLOID);
845 free(oidp, M_SYSCTLOID);
851 * Create new sysctls at run time.
852 * clist may point to a valid context initialized with sysctl_ctx_init().
855 sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent,
856 int number, const char *name, int kind, void *arg1, intmax_t arg2,
857 int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr,
860 struct sysctl_oid *oidp;
863 /* You have to hook up somewhere.. */
866 escaped = sysctl_escape_name(name);
867 /* Check if the node already exists, otherwise create it */
869 oidp = sysctl_find_oidname(escaped, parent);
871 free(escaped, M_SYSCTLOID);
872 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
874 /* Update the context */
876 sysctl_ctx_entry_add(clist, oidp);
880 sysctl_warn_reuse(__func__, oidp);
885 oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO);
886 oidp->oid_parent = parent;
887 RB_INIT(&oidp->oid_children);
888 oidp->oid_number = number;
889 oidp->oid_refcnt = 1;
890 oidp->oid_name = escaped;
891 oidp->oid_handler = handler;
892 oidp->oid_kind = CTLFLAG_DYN | kind;
893 oidp->oid_arg1 = arg1;
894 oidp->oid_arg2 = arg2;
897 oidp->oid_descr = strdup(descr, M_SYSCTLOID);
899 oidp->oid_label = strdup(label, M_SYSCTLOID);
900 /* Update the context, if used */
902 sysctl_ctx_entry_add(clist, oidp);
903 /* Register this oid */
904 sysctl_register_oid(oidp);
910 * Rename an existing oid.
913 sysctl_rename_oid(struct sysctl_oid *oidp, const char *name)
918 newname = strdup(name, M_SYSCTLOID);
920 oldname = __DECONST(char *, oidp->oid_name);
921 oidp->oid_name = newname;
923 free(oldname, M_SYSCTLOID);
927 * Reparent an existing oid.
930 sysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent)
932 struct sysctl_oid *oidp;
935 if (oid->oid_parent == parent) {
939 oidp = sysctl_find_oidname(oid->oid_name, parent);
944 sysctl_unregister_oid(oid);
945 oid->oid_parent = parent;
946 oid->oid_number = OID_AUTO;
947 sysctl_register_oid(oid);
953 * Register the kernel's oids on startup.
955 SET_DECLARE(sysctl_set, struct sysctl_oid);
958 sysctl_register_all(void *arg)
960 struct sysctl_oid **oidp;
962 sx_init(&sysctlmemlock, "sysctl mem");
963 sx_init(&sysctlstringlock, "sysctl string handler");
966 SET_FOREACH(oidp, sysctl_set)
967 sysctl_register_oid(*oidp);
970 SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_FIRST, sysctl_register_all, NULL);
975 * These functions implement a presently undocumented interface
976 * used by the sysctl program to walk the tree, and get the type
977 * so it can print the value.
978 * This interface is under work and consideration, and should probably
979 * be killed with a big axe by the first person who can find the time.
980 * (be aware though, that the proper interface isn't as obvious as it
981 * may seem, there are various conflicting requirements.
983 * {CTL_SYSCTL, CTL_SYSCTL_DEBUG} printf the entire MIB-tree.
984 * {CTL_SYSCTL, CTL_SYSCTL_NAME, ...} return the name of the "..."
986 * {CTL_SYSCTL, CTL_SYSCTL_NEXT, ...} return the next OID, honoring
988 * {CTL_SYSCTL, CTL_SYSCTL_NAME2OID} return the OID of the name in
990 * {CTL_SYSCTL, CTL_SYSCTL_OIDFMT, ...} return the kind & format info
992 * {CTL_SYSCTL, CTL_SYSCTL_OIDDESCR, ...} return the description of the
994 * {CTL_SYSCTL, CTL_SYSCTL_OIDLABEL, ...} return the aggregation label of
996 * {CTL_SYSCTL, CTL_SYSCTL_NEXTNOSKIP, ...} return the next OID, ignoring
1002 sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i)
1005 struct sysctl_oid *oidp;
1007 SYSCTL_ASSERT_LOCKED();
1008 SYSCTL_FOREACH(oidp, l) {
1012 printf("%d %s ", oidp->oid_number, oidp->oid_name);
1015 oidp->oid_kind & CTLFLAG_RD ? 'R':' ',
1016 oidp->oid_kind & CTLFLAG_WR ? 'W':' ');
1018 if (oidp->oid_handler)
1019 printf(" *Handler");
1021 switch (oidp->oid_kind & CTLTYPE) {
1024 if (!oidp->oid_handler) {
1025 sysctl_sysctl_debug_dump_node(
1026 SYSCTL_CHILDREN(oidp), i + 2);
1029 case CTLTYPE_INT: printf(" Int\n"); break;
1030 case CTLTYPE_UINT: printf(" u_int\n"); break;
1031 case CTLTYPE_LONG: printf(" Long\n"); break;
1032 case CTLTYPE_ULONG: printf(" u_long\n"); break;
1033 case CTLTYPE_STRING: printf(" String\n"); break;
1034 case CTLTYPE_S8: printf(" int8_t\n"); break;
1035 case CTLTYPE_S16: printf(" int16_t\n"); break;
1036 case CTLTYPE_S32: printf(" int32_t\n"); break;
1037 case CTLTYPE_S64: printf(" int64_t\n"); break;
1038 case CTLTYPE_U8: printf(" uint8_t\n"); break;
1039 case CTLTYPE_U16: printf(" uint16_t\n"); break;
1040 case CTLTYPE_U32: printf(" uint32_t\n"); break;
1041 case CTLTYPE_U64: printf(" uint64_t\n"); break;
1042 case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
1043 default: printf("\n");
1049 sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS)
1051 struct rm_priotracker tracker;
1054 error = priv_check(req->td, PRIV_SYSCTL_DEBUG);
1057 SYSCTL_RLOCK(&tracker);
1058 sysctl_sysctl_debug_dump_node(&sysctl__children, 0);
1059 SYSCTL_RUNLOCK(&tracker);
1063 SYSCTL_PROC(_sysctl, CTL_SYSCTL_DEBUG, debug, CTLTYPE_STRING | CTLFLAG_RD |
1064 CTLFLAG_MPSAFE, 0, 0, sysctl_sysctl_debug, "-", "");
1068 sysctl_sysctl_name(SYSCTL_HANDLER_ARGS)
1070 int *name = (int *) arg1;
1071 u_int namelen = arg2;
1073 struct sysctl_oid *oid, key;
1074 struct sysctl_oid_list *lsp = &sysctl__children, *lsp2;
1075 struct rm_priotracker tracker;
1078 error = sysctl_wire_old_buffer(req, 0);
1082 SYSCTL_RLOCK(&tracker);
1085 snprintf(buf,sizeof(buf),"%d",*name);
1087 error = SYSCTL_OUT(req, ".", 1);
1089 error = SYSCTL_OUT(req, buf, strlen(buf));
1097 key.oid_number = *name;
1098 oid = RB_FIND(sysctl_oid_list, lsp, &key);
1101 error = SYSCTL_OUT(req, ".", 1);
1103 error = SYSCTL_OUT(req, oid->oid_name,
1104 strlen(oid->oid_name));
1111 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE &&
1113 lsp2 = SYSCTL_CHILDREN(oid);
1117 error = SYSCTL_OUT(req, "", 1);
1119 SYSCTL_RUNLOCK(&tracker);
1124 * XXXRW/JA: Shouldn't return name data for nodes that we don't permit in
1127 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NAME, name, CTLFLAG_RD |
1128 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_name, "");
1130 enum sysctl_iter_action {
1131 ITER_SIBLINGS, /* Not matched, continue iterating siblings */
1132 ITER_CHILDREN, /* Node has children we need to iterate over them */
1133 ITER_FOUND, /* Matching node was found */
1137 * Tries to find the next node for @name and @namelen.
1139 * Returns next action to take.
1141 static enum sysctl_iter_action
1142 sysctl_sysctl_next_node(struct sysctl_oid *oidp, int *name, unsigned int namelen,
1146 if ((oidp->oid_kind & CTLFLAG_DORMANT) != 0)
1147 return (ITER_SIBLINGS);
1149 if (honor_skip && (oidp->oid_kind & CTLFLAG_SKIP) != 0)
1150 return (ITER_SIBLINGS);
1154 * We have reached a node with a full name match and are
1155 * looking for the next oid in its children.
1157 * For CTL_SYSCTL_NEXTNOSKIP we are done.
1159 * For CTL_SYSCTL_NEXT we skip CTLTYPE_NODE (unless it
1160 * has a handler) and move on to the children.
1163 return (ITER_FOUND);
1164 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1165 return (ITER_FOUND);
1166 /* If node does not have an iterator, treat it as leaf */
1167 if (oidp->oid_handler)
1168 return (ITER_FOUND);
1170 /* Report oid as a node to iterate */
1171 return (ITER_CHILDREN);
1175 * No match yet. Continue seeking the given name.
1177 * We are iterating in order by oid_number, so skip oids lower
1178 * than the one we are looking for.
1180 * When the current oid_number is higher than the one we seek,
1181 * that means we have reached the next oid in the sequence and
1184 * If the oid_number matches the name at this level then we
1185 * have to find a node to continue searching at the next level.
1187 if (oidp->oid_number < *name)
1188 return (ITER_SIBLINGS);
1189 if (oidp->oid_number > *name) {
1191 * We have reached the next oid.
1193 * For CTL_SYSCTL_NEXTNOSKIP we are done.
1195 * For CTL_SYSCTL_NEXT we skip CTLTYPE_NODE (unless it
1196 * has a handler) and move on to the children.
1199 return (ITER_FOUND);
1200 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1201 return (ITER_FOUND);
1202 /* If node does not have an iterator, treat it as leaf */
1203 if (oidp->oid_handler)
1204 return (ITER_FOUND);
1205 return (ITER_CHILDREN);
1208 /* match at a current level */
1209 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1210 return (ITER_SIBLINGS);
1211 if (oidp->oid_handler)
1212 return (ITER_SIBLINGS);
1214 return (ITER_CHILDREN);
1218 * Recursively walk the sysctl subtree at lsp until we find the given name.
1219 * Returns true and fills in next oid data in @next and @len if oid is found.
1222 sysctl_sysctl_next_action(struct sysctl_oid_list *lsp, int *name, u_int namelen,
1223 int *next, int *len, int level, bool honor_skip)
1225 struct sysctl_oid_list *next_lsp;
1226 struct sysctl_oid *oidp = NULL, key;
1227 bool success = false;
1228 enum sysctl_iter_action action;
1230 SYSCTL_ASSERT_LOCKED();
1232 * Start the search at the requested oid. But if not found, then scan
1233 * through all children.
1236 key.oid_number = *name;
1237 oidp = RB_FIND(sysctl_oid_list, lsp, &key);
1240 oidp = RB_MIN(sysctl_oid_list, lsp);
1241 for(; oidp != NULL; oidp = RB_NEXT(sysctl_oid_list, lsp, oidp)) {
1242 action = sysctl_sysctl_next_node(oidp, name, namelen,
1244 if (action == ITER_SIBLINGS)
1246 if (action == ITER_FOUND) {
1250 KASSERT((action== ITER_CHILDREN), ("ret(%d)!=ITER_CHILDREN", action));
1252 next_lsp = SYSCTL_CHILDREN(oidp);
1254 success = sysctl_sysctl_next_action(next_lsp, NULL, 0,
1255 next + 1, len, level + 1, honor_skip);
1257 success = sysctl_sysctl_next_action(next_lsp, name + 1,
1258 namelen - 1, next + 1, len, level + 1, honor_skip);
1262 * We maintain the invariant that current node oid
1263 * is >= the oid provided in @name.
1264 * As there are no usable children at this node,
1265 * current node oid is strictly > than the requested
1267 * Hence, reduce namelen to 0 to allow for picking first
1268 * nodes/leafs in the next node in list.
1278 *next = oidp->oid_number;
1287 sysctl_sysctl_next(SYSCTL_HANDLER_ARGS)
1289 int *name = (int *) arg1;
1290 u_int namelen = arg2;
1293 struct sysctl_oid_list *lsp = &sysctl__children;
1294 struct rm_priotracker tracker;
1295 int next[CTL_MAXNAME];
1298 SYSCTL_RLOCK(&tracker);
1299 success = sysctl_sysctl_next_action(lsp, name, namelen, next, &len, 1,
1300 oidp->oid_number == CTL_SYSCTL_NEXT);
1301 SYSCTL_RUNLOCK(&tracker);
1304 error = SYSCTL_OUT(req, next, len * sizeof (int));
1309 * XXXRW/JA: Shouldn't return next data for nodes that we don't permit in
1312 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NEXT, next, CTLFLAG_RD |
1313 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_next, "");
1315 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_NEXTNOSKIP, nextnoskip, CTLFLAG_RD |
1316 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_next, "");
1319 name2oid(char *name, int *oid, int *len, struct sysctl_oid **oidpp)
1321 struct sysctl_oid *oidp;
1322 struct sysctl_oid_list *lsp = &sysctl__children;
1324 SYSCTL_ASSERT_LOCKED();
1326 for (*len = 0; *len < CTL_MAXNAME;) {
1327 oidp = sysctl_find_oidname(strsep(&name, "."), lsp);
1330 *oid++ = oidp->oid_number;
1333 if (name == NULL || *name == '\0') {
1339 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
1342 if (oidp->oid_handler)
1345 lsp = SYSCTL_CHILDREN(oidp);
1351 sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS)
1354 int error, oid[CTL_MAXNAME], len = 0;
1355 struct sysctl_oid *op = NULL;
1356 struct rm_priotracker tracker;
1361 if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */
1362 return (ENAMETOOLONG);
1365 if (req->newlen >= sizeof(buf))
1366 p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK);
1368 error = SYSCTL_IN(req, p, req->newlen);
1375 p [req->newlen] = '\0';
1377 SYSCTL_RLOCK(&tracker);
1378 error = name2oid(p, oid, &len, &op);
1379 SYSCTL_RUNLOCK(&tracker);
1387 error = SYSCTL_OUT(req, oid, len * sizeof *oid);
1392 * XXXRW/JA: Shouldn't return name2oid data for nodes that we don't permit in
1395 SYSCTL_PROC(_sysctl, CTL_SYSCTL_NAME2OID, name2oid, CTLTYPE_INT | CTLFLAG_RW |
1396 CTLFLAG_ANYBODY | CTLFLAG_MPSAFE | CTLFLAG_CAPRW, 0, 0,
1397 sysctl_sysctl_name2oid, "I", "");
1400 sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS)
1402 struct sysctl_oid *oid;
1403 struct rm_priotracker tracker;
1406 error = sysctl_wire_old_buffer(req, 0);
1410 SYSCTL_RLOCK(&tracker);
1411 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
1415 if (oid->oid_fmt == NULL) {
1419 error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind));
1422 error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1);
1424 SYSCTL_RUNLOCK(&tracker);
1428 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDFMT, oidfmt, CTLFLAG_RD |
1429 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidfmt, "");
1432 sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS)
1434 struct sysctl_oid *oid;
1435 struct rm_priotracker tracker;
1438 error = sysctl_wire_old_buffer(req, 0);
1442 SYSCTL_RLOCK(&tracker);
1443 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
1447 if (oid->oid_descr == NULL) {
1451 error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1);
1453 SYSCTL_RUNLOCK(&tracker);
1457 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDDESCR, oiddescr, CTLFLAG_RD |
1458 CTLFLAG_MPSAFE|CTLFLAG_CAPRD, sysctl_sysctl_oiddescr, "");
1461 sysctl_sysctl_oidlabel(SYSCTL_HANDLER_ARGS)
1463 struct sysctl_oid *oid;
1464 struct rm_priotracker tracker;
1467 error = sysctl_wire_old_buffer(req, 0);
1471 SYSCTL_RLOCK(&tracker);
1472 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
1476 if (oid->oid_label == NULL) {
1480 error = SYSCTL_OUT(req, oid->oid_label, strlen(oid->oid_label) + 1);
1482 SYSCTL_RUNLOCK(&tracker);
1486 static SYSCTL_NODE(_sysctl, CTL_SYSCTL_OIDLABEL, oidlabel, CTLFLAG_RD |
1487 CTLFLAG_MPSAFE | CTLFLAG_CAPRD, sysctl_sysctl_oidlabel, "");
1490 * Default "handler" functions.
1496 * a variable: point arg1 at it.
1497 * a constant: pass it in arg2.
1501 sysctl_handle_bool(SYSCTL_HANDLER_ARGS)
1507 * Attempt to get a coherent snapshot by making a copy of the data.
1510 temp = *(bool *)arg1 ? 1 : 0;
1512 temp = arg2 ? 1 : 0;
1514 error = SYSCTL_OUT(req, &temp, sizeof(temp));
1515 if (error || !req->newptr)
1521 error = SYSCTL_IN(req, &temp, sizeof(temp));
1523 *(bool *)arg1 = temp ? 1 : 0;
1529 * Handle an int8_t, signed or unsigned.
1531 * a variable: point arg1 at it.
1532 * a constant: pass it in arg2.
1536 sysctl_handle_8(SYSCTL_HANDLER_ARGS)
1542 * Attempt to get a coherent snapshot by making a copy of the data.
1545 tmpout = *(int8_t *)arg1;
1548 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout));
1550 if (error || !req->newptr)
1556 error = SYSCTL_IN(req, arg1, sizeof(tmpout));
1561 * Handle an int16_t, signed or unsigned.
1563 * a variable: point arg1 at it.
1564 * a constant: pass it in arg2.
1568 sysctl_handle_16(SYSCTL_HANDLER_ARGS)
1574 * Attempt to get a coherent snapshot by making a copy of the data.
1577 tmpout = *(int16_t *)arg1;
1580 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout));
1582 if (error || !req->newptr)
1588 error = SYSCTL_IN(req, arg1, sizeof(tmpout));
1593 * Handle an int32_t, signed or unsigned.
1595 * a variable: point arg1 at it.
1596 * a constant: pass it in arg2.
1600 sysctl_handle_32(SYSCTL_HANDLER_ARGS)
1606 * Attempt to get a coherent snapshot by making a copy of the data.
1609 tmpout = *(int32_t *)arg1;
1612 error = SYSCTL_OUT(req, &tmpout, sizeof(tmpout));
1614 if (error || !req->newptr)
1620 error = SYSCTL_IN(req, arg1, sizeof(tmpout));
1625 * Handle an int, signed or unsigned.
1627 * a variable: point arg1 at it.
1628 * a constant: pass it in arg2.
1632 sysctl_handle_int(SYSCTL_HANDLER_ARGS)
1634 int tmpout, error = 0;
1637 * Attempt to get a coherent snapshot by making a copy of the data.
1640 tmpout = *(int *)arg1;
1643 error = SYSCTL_OUT(req, &tmpout, sizeof(int));
1645 if (error || !req->newptr)
1651 error = SYSCTL_IN(req, arg1, sizeof(int));
1656 * Based on sysctl_handle_int() convert milliseconds into ticks.
1657 * Note: this is used by TCP.
1661 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS)
1666 s = (int)((int64_t)tt * 1000 / hz);
1668 error = sysctl_handle_int(oidp, &s, 0, req);
1669 if (error || !req->newptr)
1672 tt = (int)((int64_t)s * hz / 1000);
1681 * Handle a long, signed or unsigned.
1683 * a variable: point arg1 at it.
1684 * a constant: pass it in arg2.
1688 sysctl_handle_long(SYSCTL_HANDLER_ARGS)
1697 * Attempt to get a coherent snapshot by making a copy of the data.
1700 tmplong = *(long *)arg1;
1704 if (req->flags & SCTL_MASK32) {
1706 error = SYSCTL_OUT(req, &tmpint, sizeof(int));
1709 error = SYSCTL_OUT(req, &tmplong, sizeof(long));
1711 if (error || !req->newptr)
1717 else if (req->flags & SCTL_MASK32) {
1718 error = SYSCTL_IN(req, &tmpint, sizeof(int));
1719 *(long *)arg1 = (long)tmpint;
1723 error = SYSCTL_IN(req, arg1, sizeof(long));
1728 * Handle a 64 bit int, signed or unsigned.
1730 * a variable: point arg1 at it.
1731 * a constant: pass it in arg2.
1734 sysctl_handle_64(SYSCTL_HANDLER_ARGS)
1740 * Attempt to get a coherent snapshot by making a copy of the data.
1743 tmpout = *(uint64_t *)arg1;
1746 error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t));
1748 if (error || !req->newptr)
1754 error = SYSCTL_IN(req, arg1, sizeof(uint64_t));
1759 * Handle our generic '\0' terminated 'C' string.
1761 * a variable string: point arg1 at it, arg2 is max length.
1762 * a constant string: point arg1 at it, arg2 is zero.
1766 sysctl_handle_string(SYSCTL_HANDLER_ARGS)
1770 int error = 0, ro_string = 0;
1773 * If the sysctl isn't writable and isn't a preallocated tunable that
1774 * can be modified by kenv(2), microoptimise and treat it as a
1776 * A zero-length buffer indicates a fixed size read-only
1777 * string. In ddb, don't worry about trying to make a malloced
1780 if ((oidp->oid_kind & (CTLFLAG_WR | CTLFLAG_TUN)) == 0 ||
1781 arg2 == 0 || kdb_active) {
1782 arg2 = strlen((char *)arg1) + 1;
1786 if (req->oldptr != NULL) {
1789 outlen = strlen(tmparg) + 1;
1791 tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK);
1792 sx_slock(&sysctlstringlock);
1793 memcpy(tmparg, arg1, arg2);
1794 sx_sunlock(&sysctlstringlock);
1795 outlen = strlen(tmparg) + 1;
1798 error = SYSCTL_OUT(req, tmparg, outlen);
1801 free(tmparg, M_SYSCTLTMP);
1804 sx_slock(&sysctlstringlock);
1805 outlen = strlen((char *)arg1) + 1;
1807 sx_sunlock(&sysctlstringlock);
1808 error = SYSCTL_OUT(req, NULL, outlen);
1810 if (error || !req->newptr)
1813 if (req->newlen - req->newidx >= arg2 ||
1814 req->newlen - req->newidx < 0) {
1816 } else if (req->newlen - req->newidx == 0) {
1817 sx_xlock(&sysctlstringlock);
1818 ((char *)arg1)[0] = '\0';
1819 sx_xunlock(&sysctlstringlock);
1820 } else if (req->newfunc == sysctl_new_kernel) {
1821 arg2 = req->newlen - req->newidx;
1822 sx_xlock(&sysctlstringlock);
1823 error = SYSCTL_IN(req, arg1, arg2);
1825 ((char *)arg1)[arg2] = '\0';
1826 req->newidx += arg2;
1828 sx_xunlock(&sysctlstringlock);
1830 arg2 = req->newlen - req->newidx;
1831 tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK);
1833 error = SYSCTL_IN(req, tmparg, arg2);
1835 free(tmparg, M_SYSCTLTMP);
1839 sx_xlock(&sysctlstringlock);
1840 memcpy(arg1, tmparg, arg2);
1841 ((char *)arg1)[arg2] = '\0';
1842 sx_xunlock(&sysctlstringlock);
1843 free(tmparg, M_SYSCTLTMP);
1844 req->newidx += arg2;
1850 * Handle any kind of opaque data.
1851 * arg1 points to it, arg2 is the size.
1855 sysctl_handle_opaque(SYSCTL_HANDLER_ARGS)
1859 struct sysctl_req req2;
1862 * Attempt to get a coherent snapshot, by using the thread
1863 * pre-emption counter updated from within mi_switch() to
1864 * determine if we were pre-empted during a bcopy() or
1865 * copyout(). Make 3 attempts at doing this before giving up.
1866 * If we encounter an error, stop immediately.
1871 generation = curthread->td_generation;
1872 error = SYSCTL_OUT(req, arg1, arg2);
1876 if (generation != curthread->td_generation && tries < 3) {
1881 error = SYSCTL_IN(req, arg1, arg2);
1887 * Based on sysctl_handle_64() convert microseconds to a sbintime.
1890 sysctl_usec_to_sbintime(SYSCTL_HANDLER_ARGS)
1895 usec = sbttous(*(sbintime_t *)arg1);
1897 error = sysctl_handle_64(oidp, &usec, 0, req);
1898 if (error || !req->newptr)
1901 *(sbintime_t *)arg1 = ustosbt(usec);
1907 * Based on sysctl_handle_64() convert milliseconds to a sbintime.
1910 sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS)
1915 msec = sbttoms(*(sbintime_t *)arg1);
1917 error = sysctl_handle_64(oidp, &msec, 0, req);
1918 if (error || !req->newptr)
1921 *(sbintime_t *)arg1 = mstosbt(msec);
1927 * Convert seconds to a struct timeval. Intended for use with
1928 * intervals and thus does not permit negative seconds.
1931 sysctl_sec_to_timeval(SYSCTL_HANDLER_ARGS)
1939 error = sysctl_handle_int(oidp, &secs, 0, req);
1940 if (error || req->newptr == NULL)
1951 * Transfer functions to/from kernel space.
1952 * XXX: rather untested at this point
1955 sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l)
1961 if (req->oldlen <= req->oldidx)
1964 if (i > req->oldlen - req->oldidx)
1965 i = req->oldlen - req->oldidx;
1967 bcopy(p, (char *)req->oldptr + req->oldidx, i);
1970 if (req->oldptr && i != l)
1976 sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l)
1980 if (req->newlen - req->newidx < l)
1982 bcopy((const char *)req->newptr + req->newidx, p, l);
1988 kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
1989 size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags)
1992 struct sysctl_req req;
1994 bzero(&req, sizeof req);
2000 req.oldlen = *oldlenp;
2002 req.validlen = req.oldlen;
2009 req.newlen = newlen;
2013 req.oldfunc = sysctl_old_kernel;
2014 req.newfunc = sysctl_new_kernel;
2015 req.lock = REQ_UNWIRED;
2017 error = sysctl_root(0, name, namelen, &req);
2019 if (req.lock == REQ_WIRED && req.validlen > 0)
2020 vsunlock(req.oldptr, req.validlen);
2022 if (error && error != ENOMEM)
2026 if (req.oldptr && req.oldidx > req.validlen)
2027 *retval = req.validlen;
2029 *retval = req.oldidx;
2035 kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp,
2036 void *new, size_t newlen, size_t *retval, int flags)
2038 int oid[CTL_MAXNAME];
2039 size_t oidlen, plen;
2042 oid[0] = CTL_SYSCTL;
2043 oid[1] = CTL_SYSCTL_NAME2OID;
2044 oidlen = sizeof(oid);
2046 error = kernel_sysctl(td, oid, 2, oid, &oidlen,
2047 (void *)name, strlen(name), &plen, flags);
2051 error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp,
2052 new, newlen, retval, flags);
2057 * Transfer function to/from user space.
2060 sysctl_old_user(struct sysctl_req *req, const void *p, size_t l)
2062 size_t i, len, origidx;
2065 origidx = req->oldidx;
2067 if (req->oldptr == NULL)
2070 * If we have not wired the user supplied buffer and we are currently
2071 * holding locks, drop a witness warning, as it's possible that
2072 * write operations to the user page can sleep.
2074 if (req->lock != REQ_WIRED)
2075 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
2076 "sysctl_old_user()");
2078 len = req->validlen;
2082 if (i > len - origidx)
2084 if (req->lock == REQ_WIRED) {
2085 error = copyout_nofault(p, (char *)req->oldptr +
2088 error = copyout(p, (char *)req->oldptr + origidx, i);
2098 sysctl_new_user(struct sysctl_req *req, void *p, size_t l)
2104 if (req->newlen - req->newidx < l)
2106 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
2107 "sysctl_new_user()");
2108 error = copyin((const char *)req->newptr + req->newidx, p, l);
2114 * Wire the user space destination buffer. If set to a value greater than
2115 * zero, the len parameter limits the maximum amount of wired memory.
2118 sysctl_wire_old_buffer(struct sysctl_req *req, size_t len)
2123 wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen;
2125 if (req->lock != REQ_WIRED && req->oldptr &&
2126 req->oldfunc == sysctl_old_user) {
2127 if (wiredlen != 0) {
2128 ret = vslock(req->oldptr, wiredlen);
2135 req->lock = REQ_WIRED;
2136 req->validlen = wiredlen;
2142 sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
2143 int *nindx, struct sysctl_req *req)
2145 struct sysctl_oid_list *lsp;
2146 struct sysctl_oid *oid;
2147 struct sysctl_oid key;
2150 SYSCTL_ASSERT_LOCKED();
2151 lsp = &sysctl__children;
2153 while (indx < CTL_MAXNAME) {
2154 key.oid_number = name[indx];
2155 oid = RB_FIND(sysctl_oid_list, lsp, &key);
2160 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2161 if (oid->oid_handler != NULL || indx == namelen) {
2165 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0,
2166 ("%s found DYING node %p", __func__, oid));
2169 lsp = SYSCTL_CHILDREN(oid);
2170 } else if (indx == namelen) {
2171 if ((oid->oid_kind & CTLFLAG_DORMANT) != 0)
2176 KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0,
2177 ("%s found DYING node %p", __func__, oid));
2187 * Traverse our tree, and find the right node, execute whatever it points
2188 * to, and return the resulting error code.
2192 sysctl_root(SYSCTL_HANDLER_ARGS)
2194 struct sysctl_oid *oid;
2195 struct rm_priotracker tracker;
2196 int error, indx, lvl;
2198 SYSCTL_RLOCK(&tracker);
2200 error = sysctl_find_oid(arg1, arg2, &oid, &indx, req);
2204 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2206 * You can't call a sysctl when it's a node, but has
2207 * no handler. Inform the user that it's a node.
2208 * The indx may or may not be the same as namelen.
2210 if (oid->oid_handler == NULL) {
2216 /* Is this sysctl writable? */
2217 if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) {
2222 KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL"));
2224 #ifdef CAPABILITY_MODE
2226 * If the process is in capability mode, then don't permit reading or
2227 * writing unless specifically granted for the node.
2229 if (IN_CAPABILITY_MODE(req->td)) {
2230 if ((req->oldptr && !(oid->oid_kind & CTLFLAG_CAPRD)) ||
2231 (req->newptr && !(oid->oid_kind & CTLFLAG_CAPWR))) {
2238 /* Is this sysctl sensitive to securelevels? */
2239 if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) {
2240 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE;
2241 error = securelevel_gt(req->td->td_ucred, lvl);
2246 /* Is this sysctl writable by only privileged users? */
2247 if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) {
2250 if (oid->oid_kind & CTLFLAG_PRISON)
2251 priv = PRIV_SYSCTL_WRITEJAIL;
2253 else if ((oid->oid_kind & CTLFLAG_VNET) &&
2254 prison_owns_vnet(req->td->td_ucred))
2255 priv = PRIV_SYSCTL_WRITEJAIL;
2258 priv = PRIV_SYSCTL_WRITE;
2259 error = priv_check(req->td, priv);
2264 if (!oid->oid_handler) {
2269 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2270 arg1 = (int *)arg1 + indx;
2273 arg1 = oid->oid_arg1;
2274 arg2 = oid->oid_arg2;
2277 error = mac_system_check_sysctl(req->td->td_ucred, oid, arg1, arg2,
2283 if ((oid->oid_kind & CTLFLAG_VNET) && arg1 != NULL)
2284 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
2286 error = sysctl_root_handler_locked(oid, arg1, arg2, req, &tracker);
2289 SYSCTL_RUNLOCK(&tracker);
2293 #ifndef _SYS_SYSPROTO_H_
2294 struct __sysctl_args {
2304 sys___sysctl(struct thread *td, struct __sysctl_args *uap)
2306 int error, i, name[CTL_MAXNAME];
2309 if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
2312 error = copyin(uap->name, &name, uap->namelen * sizeof(int));
2316 error = userland_sysctl(td, name, uap->namelen,
2317 uap->old, uap->oldlenp, 0,
2318 uap->new, uap->newlen, &j, 0);
2319 if (error && error != ENOMEM)
2322 i = copyout(&j, uap->oldlenp, sizeof(j));
2330 kern___sysctlbyname(struct thread *td, const char *oname, size_t namelen,
2331 void *old, size_t *oldlenp, void *new, size_t newlen, size_t *retval,
2332 int flags, bool inkernel)
2334 int oid[CTL_MAXNAME];
2340 if (namelen > MAXPATHLEN || namelen == 0)
2343 if (namelen > sizeof(namebuf))
2344 name = malloc(namelen, M_SYSCTL, M_WAITOK);
2345 error = copyin(oname, name, namelen);
2349 oid[0] = CTL_SYSCTL;
2350 oid[1] = CTL_SYSCTL_NAME2OID;
2351 oidlen = sizeof(oid);
2352 error = kernel_sysctl(td, oid, 2, oid, &oidlen, (void *)name, namelen,
2356 error = userland_sysctl(td, oid, *retval / sizeof(int), old, oldlenp,
2357 inkernel, new, newlen, retval, flags);
2360 if (namelen > sizeof(namebuf))
2361 free(name, M_SYSCTL);
2365 #ifndef _SYS_SYSPROTO_H_
2366 struct __sysctlbyname_args {
2376 sys___sysctlbyname(struct thread *td, struct __sysctlbyname_args *uap)
2381 error = kern___sysctlbyname(td, uap->name, uap->namelen, uap->old,
2382 uap->oldlenp, uap->new, uap->newlen, &rv, 0, 0);
2385 if (uap->oldlenp != NULL)
2386 error = copyout(&rv, uap->oldlenp, sizeof(rv));
2392 * This is used from various compatibility syscalls too. That's why name
2393 * must be in kernel space.
2396 userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
2397 size_t *oldlenp, int inkernel, const void *new, size_t newlen,
2398 size_t *retval, int flags)
2400 int error = 0, memlocked;
2401 struct sysctl_req req;
2403 bzero(&req, sizeof req);
2410 req.oldlen = *oldlenp;
2412 error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp));
2417 req.validlen = req.oldlen;
2421 req.newlen = newlen;
2425 req.oldfunc = sysctl_old_user;
2426 req.newfunc = sysctl_new_user;
2427 req.lock = REQ_UNWIRED;
2430 if (KTRPOINT(curthread, KTR_SYSCTL))
2431 ktrsysctl(name, namelen);
2434 if (req.oldptr && req.oldlen > 4 * PAGE_SIZE) {
2436 sx_xlock(&sysctlmemlock);
2438 CURVNET_SET(TD_TO_VNET(td));
2443 error = sysctl_root(0, name, namelen, &req);
2444 if (error != EAGAIN)
2446 kern_yield(PRI_USER);
2451 if (req.lock == REQ_WIRED && req.validlen > 0)
2452 vsunlock(req.oldptr, req.validlen);
2454 sx_xunlock(&sysctlmemlock);
2456 if (error && error != ENOMEM)
2460 if (req.oldptr && req.oldidx > req.validlen)
2461 *retval = req.validlen;
2463 *retval = req.oldidx;
2469 * Drain into a sysctl struct. The user buffer should be wired if a page
2470 * fault would cause issue.
2473 sbuf_sysctl_drain(void *arg, const char *data, int len)
2475 struct sysctl_req *req = arg;
2478 error = SYSCTL_OUT(req, data, len);
2479 KASSERT(error >= 0, ("Got unexpected negative value %d", error));
2480 return (error == 0 ? len : -error);
2484 sbuf_new_for_sysctl(struct sbuf *s, char *buf, int length,
2485 struct sysctl_req *req)
2488 /* Supply a default buffer size if none given. */
2489 if (buf == NULL && length == 0)
2491 s = sbuf_new(s, buf, length, SBUF_FIXEDLEN | SBUF_INCLUDENUL);
2492 sbuf_set_drain(s, sbuf_sysctl_drain, req);
2498 /* The current OID the debugger is working with */
2499 static struct sysctl_oid *g_ddb_oid;
2501 /* The current flags specified by the user */
2502 static int g_ddb_sysctl_flags;
2504 /* Check to see if the last sysctl printed */
2505 static int g_ddb_sysctl_printed;
2507 static const int ctl_sign[CTLTYPE+1] = {
2516 static const int ctl_size[CTLTYPE+1] = {
2517 [CTLTYPE_INT] = sizeof(int),
2518 [CTLTYPE_UINT] = sizeof(u_int),
2519 [CTLTYPE_LONG] = sizeof(long),
2520 [CTLTYPE_ULONG] = sizeof(u_long),
2521 [CTLTYPE_S8] = sizeof(int8_t),
2522 [CTLTYPE_S16] = sizeof(int16_t),
2523 [CTLTYPE_S32] = sizeof(int32_t),
2524 [CTLTYPE_S64] = sizeof(int64_t),
2525 [CTLTYPE_U8] = sizeof(uint8_t),
2526 [CTLTYPE_U16] = sizeof(uint16_t),
2527 [CTLTYPE_U32] = sizeof(uint32_t),
2528 [CTLTYPE_U64] = sizeof(uint64_t),
2531 #define DB_SYSCTL_NAME_ONLY 0x001 /* Compare with -N */
2532 #define DB_SYSCTL_VALUE_ONLY 0x002 /* Compare with -n */
2533 #define DB_SYSCTL_OPAQUE 0x004 /* Compare with -o */
2534 #define DB_SYSCTL_HEX 0x008 /* Compare with -x */
2536 #define DB_SYSCTL_SAFE_ONLY 0x100 /* Only simple types */
2538 static const char db_sysctl_modifs[] = {
2542 static const int db_sysctl_modif_values[] = {
2543 DB_SYSCTL_NAME_ONLY, DB_SYSCTL_VALUE_ONLY,
2544 DB_SYSCTL_OPAQUE, DB_SYSCTL_HEX,
2547 /* Handlers considered safe to print while recursing */
2548 static int (* const db_safe_handlers[])(SYSCTL_HANDLER_ARGS) = {
2556 sysctl_handle_string,
2557 sysctl_handle_opaque,
2561 * Use in place of sysctl_old_kernel to print sysctl values.
2563 * Compare to the output handling in show_var from sbin/sysctl/sysctl.c
2566 sysctl_old_ddb(struct sysctl_req *req, const void *ptr, size_t len)
2568 const u_char *val, *p;
2570 size_t intlen, slen;
2573 int sign, ctltype, hexlen, xflag, error;
2575 /* Suppress false-positive GCC uninitialized variable warnings */
2587 /* We are going to print */
2588 g_ddb_sysctl_printed = 1;
2590 xflag = g_ddb_sysctl_flags & DB_SYSCTL_HEX;
2592 ctltype = (g_ddb_oid->oid_kind & CTLTYPE);
2593 sign = ctl_sign[ctltype];
2594 intlen = ctl_size[ctltype];
2598 case CTLTYPE_STRING:
2599 db_printf("%.*s", (int) len, (const char *) p);
2615 hexlen = 2 + (intlen * CHAR_BIT + 3) / 4;
2617 while (len >= intlen) {
2621 umv = *(const u_int *)p;
2622 mv = *(const int *)p;
2626 umv = *(const u_long *)p;
2627 mv = *(const long *)p;
2631 umv = *(const uint8_t *)p;
2632 mv = *(const int8_t *)p;
2636 umv = *(const uint16_t *)p;
2637 mv = *(const int16_t *)p;
2641 umv = *(const uint32_t *)p;
2642 mv = *(const int32_t *)p;
2646 umv = *(const uint64_t *)p;
2647 mv = *(const int64_t *)p;
2651 db_printf("%s", sep1);
2653 db_printf("%#0*jx", hexlen, umv);
2655 db_printf("%ju", umv);
2656 else if (g_ddb_oid->oid_fmt[1] == 'K') {
2657 /* Kelvins are currently unsupported. */
2661 db_printf("%jd", mv);
2670 case CTLTYPE_OPAQUE:
2671 /* TODO: Support struct functions. */
2675 db_printf("Format:%s Length:%zu Dump:0x",
2676 g_ddb_oid->oid_fmt, len);
2677 while (len-- && (xflag || p < val + 16))
2678 db_printf("%02x", *p++);
2679 if (!xflag && len > 16)
2686 req->oldidx += slen;
2691 * Avoid setting new sysctl values from the debugger
2694 sysctl_new_ddb(struct sysctl_req *req, void *p, size_t l)
2700 /* Changing sysctls from the debugger is currently unsupported */
2705 * Run a sysctl handler with the DDB oldfunc and newfunc attached.
2706 * Instead of copying any output to a buffer we'll dump it right to
2710 db_sysctl(struct sysctl_oid *oidp, int *name, u_int namelen,
2711 void *old, size_t *oldlenp, size_t *retval, int flags)
2713 struct sysctl_req req;
2716 /* Setup the request */
2717 bzero(&req, sizeof req);
2718 req.td = kdb_thread;
2719 req.oldfunc = sysctl_old_ddb;
2720 req.newfunc = sysctl_new_ddb;
2721 req.lock = REQ_UNWIRED;
2723 req.oldlen = *oldlenp;
2725 req.validlen = req.oldlen;
2730 /* Setup our globals for sysctl_old_ddb */
2732 g_ddb_sysctl_flags = flags;
2733 g_ddb_sysctl_printed = 0;
2735 error = sysctl_root(0, name, namelen, &req);
2739 g_ddb_sysctl_flags = 0;
2742 if (req.oldptr && req.oldidx > req.validlen)
2743 *retval = req.validlen;
2745 *retval = req.oldidx;
2751 * Show a sysctl's name
2754 db_show_oid_name(int *oid, size_t nlen)
2756 struct sysctl_oid *oidp;
2757 int qoid[CTL_MAXNAME + 2];
2760 qoid[0] = CTL_SYSCTL;
2761 qoid[1] = CTL_SYSCTL_NAME;
2762 memcpy(qoid + 2, oid, nlen * sizeof(int));
2764 error = sysctl_find_oid(qoid, nlen + 2, &oidp, NULL, NULL);
2766 db_error("sysctl name oid");
2768 error = db_sysctl(oidp, qoid, nlen + 2, NULL, NULL, NULL, 0);
2770 db_error("sysctl name");
2774 * Check to see if an OID is safe to print from ddb.
2777 db_oid_safe(const struct sysctl_oid *oidp)
2779 for (unsigned int i = 0; i < nitems(db_safe_handlers); ++i) {
2780 if (oidp->oid_handler == db_safe_handlers[i])
2788 * Show a sysctl at a specific OID
2789 * Compare to the input handling in show_var from sbin/sysctl/sysctl.c
2792 db_show_oid(struct sysctl_oid *oidp, int *oid, size_t nlen, int flags)
2794 int error, xflag, oflag, Nflag, nflag;
2797 xflag = flags & DB_SYSCTL_HEX;
2798 oflag = flags & DB_SYSCTL_OPAQUE;
2799 nflag = flags & DB_SYSCTL_VALUE_ONLY;
2800 Nflag = flags & DB_SYSCTL_NAME_ONLY;
2802 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_OPAQUE &&
2807 db_show_oid_name(oid, nlen);
2813 db_show_oid_name(oid, nlen);
2817 if ((flags & DB_SYSCTL_SAFE_ONLY) && !db_oid_safe(oidp)) {
2818 db_printf("Skipping, unsafe to print while recursing.");
2823 /* Try once, and ask about the size */
2825 error = db_sysctl(oidp, oid, nlen,
2826 NULL, NULL, &len, flags);
2830 if (!g_ddb_sysctl_printed)
2831 /* Lie about the size */
2832 error = db_sysctl(oidp, oid, nlen,
2833 (void *) 1, &len, NULL, flags);
2841 * Show all sysctls under a specific OID
2842 * Compare to sysctl_all from sbin/sysctl/sysctl.c
2845 db_show_sysctl_all(int *oid, size_t len, int flags)
2847 struct sysctl_oid *oidp;
2848 int qoid[CTL_MAXNAME + 2], next[CTL_MAXNAME];
2851 qoid[0] = CTL_SYSCTL;
2852 qoid[1] = CTL_SYSCTL_NEXT;
2855 memcpy(&qoid[2], oid, nlen * sizeof(int));
2862 size_t nextsize = sizeof(next);
2864 error = kernel_sysctl(kdb_thread, qoid, nlen + 2,
2865 next, &nextsize, NULL, 0, &nlen, 0);
2867 if (error == ENOENT)
2870 db_error("sysctl(next)");
2873 nlen /= sizeof(int);
2875 if (nlen < (unsigned int)len)
2878 if (memcmp(&oid[0], &next[0], len * sizeof(int)) != 0)
2881 /* Find the OID in question */
2882 error = sysctl_find_oid(next, nlen, &oidp, NULL, NULL);
2886 (void)db_show_oid(oidp, next, nlen, flags | DB_SYSCTL_SAFE_ONLY);
2891 memcpy(&qoid[2 + len], &next[len], (nlen - len) * sizeof(int));
2896 * Show a sysctl by its user facing string
2899 db_sysctlbyname(char *name, int flags)
2901 struct sysctl_oid *oidp;
2902 int oid[CTL_MAXNAME];
2905 error = name2oid(name, oid, &nlen, &oidp);
2910 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
2911 db_show_sysctl_all(oid, nlen, flags);
2913 error = db_show_oid(oidp, oid, nlen, flags);
2920 db_sysctl_cmd_usage(void)
2923 " sysctl [/Nnox] <sysctl> \n"
2925 " <sysctl> The name of the sysctl to show. \n"
2927 " Show a sysctl by hooking into SYSCTL_IN and SYSCTL_OUT. \n"
2928 " This will work for most sysctls, but should not be used \n"
2929 " with sysctls that are known to malloc. \n"
2931 " While recursing any \"unsafe\" sysctls will be skipped. \n"
2932 " Call sysctl directly on the sysctl to try printing the \n"
2933 " skipped sysctl. This is unsafe and may make the ddb \n"
2934 " session unusable. \n"
2937 " /N Display only the name of the sysctl. \n"
2938 " /n Display only the value of the sysctl. \n"
2939 " /o Display opaque values. \n"
2940 " /x Display the sysctl in hex. \n"
2943 "sysctl vm.v_free_min \n"
2944 "vn.v_free_min: 12669 \n"
2949 * Show a specific sysctl similar to sysctl (8).
2951 DB_COMMAND_FLAGS(sysctl, db_sysctl_cmd, CS_OWN)
2953 char name[TOK_STRING_SIZE];
2954 int error, i, t, flags;
2956 /* Parse the modifiers */
2957 t = db_read_token();
2958 if (t == tSLASH || t == tMINUS) {
2959 t = db_read_token();
2961 db_printf("Bad modifier\n");
2965 db_strcpy(modif, db_tok_string);
2973 for (i = 0; i < nitems(db_sysctl_modifs); i++) {
2974 if (strchr(modif, db_sysctl_modifs[i])) {
2975 flags |= db_sysctl_modif_values[i];
2979 /* Parse the sysctl names */
2980 t = db_read_token();
2982 db_printf("Need sysctl name\n");
2987 /* Copy the name into a temporary buffer */
2988 db_strcpy(name, db_tok_string);
2990 /* Ensure there is no trailing cruft */
2991 t = db_read_token();
2993 db_printf("Unexpected sysctl argument\n");
2998 error = db_sysctlbyname(name, flags);
2999 if (error == ENOENT) {
3000 db_printf("unknown oid: '%s'\n", db_tok_string);
3003 db_printf("%s: error: %d\n", db_tok_string, error);
3008 /* Ensure we eat all of our text */
3011 if (error == EINVAL) {
3012 db_sysctl_cmd_usage();