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306e6b8393
sysctl_sysctl_next() to skip this sysctl. The sysctl is still available, but doesn't appear in a "sysctl -a". This is especially useful when you want to deprecate a sysctl, and add a warning into it to warn users that they are using an old interface. Without this flag, the warning would get echoed when running "sysctl -a" (which happens at boot).
1479 lines
33 KiB
C
1479 lines
33 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Karels at Berkeley Software Design, Inc.
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*
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* Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
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* project, to make these variables more userfriendly.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/sysproto.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic");
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static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids");
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static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer");
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/*
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* Locking - this locks the sysctl tree in memory.
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*/
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static struct sx sysctllock;
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#define SYSCTL_LOCK() sx_xlock(&sysctllock)
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#define SYSCTL_UNLOCK() sx_xunlock(&sysctllock)
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#define SYSCTL_INIT() sx_init(&sysctllock, "sysctl sysctllock")
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static int sysctl_root(SYSCTL_HANDLER_ARGS);
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struct sysctl_oid_list sysctl__children; /* root list */
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static struct sysctl_oid *
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sysctl_find_oidname(const char *name, struct sysctl_oid_list *list)
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{
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struct sysctl_oid *oidp;
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SLIST_FOREACH(oidp, list, oid_link) {
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if (strcmp(oidp->oid_name, name) == 0) {
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return (oidp);
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}
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}
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return (NULL);
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}
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/*
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* Initialization of the MIB tree.
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*
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* Order by number in each list.
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*/
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void
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sysctl_register_oid(struct sysctl_oid *oidp)
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{
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struct sysctl_oid_list *parent = oidp->oid_parent;
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struct sysctl_oid *p;
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struct sysctl_oid *q;
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/*
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* First check if another oid with the same name already
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* exists in the parent's list.
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*/
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p = sysctl_find_oidname(oidp->oid_name, parent);
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if (p != NULL) {
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if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
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p->oid_refcnt++;
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return;
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} else {
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printf("can't re-use a leaf (%s)!\n", p->oid_name);
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return;
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}
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}
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/*
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* If this oid has a number OID_AUTO, give it a number which
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* is greater than any current oid.
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* NOTE: DO NOT change the starting value here, change it in
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* <sys/sysctl.h>, and make sure it is at least 256 to
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* accomodate e.g. net.inet.raw as a static sysctl node.
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*/
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if (oidp->oid_number == OID_AUTO) {
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static int newoid = CTL_AUTO_START;
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oidp->oid_number = newoid++;
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if (newoid == 0x7fffffff)
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panic("out of oids");
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}
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#if 0
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else if (oidp->oid_number >= CTL_AUTO_START) {
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/* do not panic; this happens when unregistering sysctl sets */
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printf("static sysctl oid too high: %d", oidp->oid_number);
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}
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#endif
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/*
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* Insert the oid into the parent's list in order.
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*/
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q = NULL;
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SLIST_FOREACH(p, parent, oid_link) {
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if (oidp->oid_number < p->oid_number)
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break;
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q = p;
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}
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if (q)
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SLIST_INSERT_AFTER(q, oidp, oid_link);
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else
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SLIST_INSERT_HEAD(parent, oidp, oid_link);
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}
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void
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sysctl_unregister_oid(struct sysctl_oid *oidp)
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{
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SLIST_REMOVE(oidp->oid_parent, oidp, sysctl_oid, oid_link);
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}
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/* Initialize a new context to keep track of dynamically added sysctls. */
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int
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sysctl_ctx_init(struct sysctl_ctx_list *c)
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{
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if (c == NULL) {
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return (EINVAL);
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}
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TAILQ_INIT(c);
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return (0);
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}
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/* Free the context, and destroy all dynamic oids registered in this context */
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int
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sysctl_ctx_free(struct sysctl_ctx_list *clist)
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{
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struct sysctl_ctx_entry *e, *e1;
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int error;
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error = 0;
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/*
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* First perform a "dry run" to check if it's ok to remove oids.
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* XXX FIXME
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* XXX This algorithm is a hack. But I don't know any
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* XXX better solution for now...
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*/
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TAILQ_FOREACH(e, clist, link) {
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error = sysctl_remove_oid(e->entry, 0, 0);
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if (error)
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break;
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}
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/*
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* Restore deregistered entries, either from the end,
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* or from the place where error occured.
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* e contains the entry that was not unregistered
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*/
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if (error)
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e1 = TAILQ_PREV(e, sysctl_ctx_list, link);
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else
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e1 = TAILQ_LAST(clist, sysctl_ctx_list);
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while (e1 != NULL) {
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sysctl_register_oid(e1->entry);
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e1 = TAILQ_PREV(e1, sysctl_ctx_list, link);
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}
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if (error)
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return(EBUSY);
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/* Now really delete the entries */
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e = TAILQ_FIRST(clist);
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while (e != NULL) {
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e1 = TAILQ_NEXT(e, link);
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error = sysctl_remove_oid(e->entry, 1, 0);
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if (error)
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panic("sysctl_remove_oid: corrupt tree, entry: %s",
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e->entry->oid_name);
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free(e, M_SYSCTLOID);
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e = e1;
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}
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return (error);
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}
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/* Add an entry to the context */
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struct sysctl_ctx_entry *
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sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
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{
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struct sysctl_ctx_entry *e;
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if (clist == NULL || oidp == NULL)
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return(NULL);
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e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK);
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e->entry = oidp;
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TAILQ_INSERT_HEAD(clist, e, link);
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return (e);
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}
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/* Find an entry in the context */
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struct sysctl_ctx_entry *
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sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
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{
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struct sysctl_ctx_entry *e;
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if (clist == NULL || oidp == NULL)
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return(NULL);
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TAILQ_FOREACH(e, clist, link) {
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if(e->entry == oidp)
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return(e);
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}
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return (e);
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}
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/*
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* Delete an entry from the context.
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* NOTE: this function doesn't free oidp! You have to remove it
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* with sysctl_remove_oid().
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*/
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int
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sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp)
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{
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struct sysctl_ctx_entry *e;
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if (clist == NULL || oidp == NULL)
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return (EINVAL);
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e = sysctl_ctx_entry_find(clist, oidp);
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if (e != NULL) {
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TAILQ_REMOVE(clist, e, link);
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free(e, M_SYSCTLOID);
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return (0);
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} else
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return (ENOENT);
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}
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/*
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* Remove dynamically created sysctl trees.
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* oidp - top of the tree to be removed
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* del - if 0 - just deregister, otherwise free up entries as well
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* recurse - if != 0 traverse the subtree to be deleted
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*/
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int
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sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse)
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{
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struct sysctl_oid *p;
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int error;
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if (oidp == NULL)
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return(EINVAL);
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if ((oidp->oid_kind & CTLFLAG_DYN) == 0) {
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printf("can't remove non-dynamic nodes!\n");
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return (EINVAL);
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}
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/*
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* WARNING: normal method to do this should be through
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* sysctl_ctx_free(). Use recursing as the last resort
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* method to purge your sysctl tree of leftovers...
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* However, if some other code still references these nodes,
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* it will panic.
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*/
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if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
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if (oidp->oid_refcnt == 1) {
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SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) {
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if (!recurse)
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return (ENOTEMPTY);
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error = sysctl_remove_oid(p, del, recurse);
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if (error)
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return (error);
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}
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if (del)
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free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID);
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}
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}
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if (oidp->oid_refcnt > 1 ) {
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oidp->oid_refcnt--;
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} else {
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if (oidp->oid_refcnt == 0) {
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printf("Warning: bad oid_refcnt=%u (%s)!\n",
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oidp->oid_refcnt, oidp->oid_name);
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return (EINVAL);
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}
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sysctl_unregister_oid(oidp);
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if (del) {
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if (oidp->descr)
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free((void *)(uintptr_t)(const void *)oidp->descr, M_SYSCTLOID);
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free((void *)(uintptr_t)(const void *)oidp->oid_name,
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M_SYSCTLOID);
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free(oidp, M_SYSCTLOID);
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}
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}
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return (0);
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}
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/*
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* Create new sysctls at run time.
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* clist may point to a valid context initialized with sysctl_ctx_init().
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*/
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struct sysctl_oid *
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sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent,
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int number, const char *name, int kind, void *arg1, int arg2,
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int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr)
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{
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struct sysctl_oid *oidp;
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ssize_t len;
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char *newname;
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/* You have to hook up somewhere.. */
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if (parent == NULL)
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return(NULL);
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/* Check if the node already exists, otherwise create it */
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oidp = sysctl_find_oidname(name, parent);
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if (oidp != NULL) {
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if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
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oidp->oid_refcnt++;
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/* Update the context */
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if (clist != NULL)
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sysctl_ctx_entry_add(clist, oidp);
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return (oidp);
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} else {
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printf("can't re-use a leaf (%s)!\n", name);
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return (NULL);
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}
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}
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oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO);
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oidp->oid_parent = parent;
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SLIST_NEXT(oidp, oid_link) = NULL;
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oidp->oid_number = number;
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oidp->oid_refcnt = 1;
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len = strlen(name);
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newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK);
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bcopy(name, newname, len + 1);
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newname[len] = '\0';
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oidp->oid_name = newname;
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oidp->oid_handler = handler;
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oidp->oid_kind = CTLFLAG_DYN | kind;
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if ((kind & CTLTYPE) == CTLTYPE_NODE) {
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/* Allocate space for children */
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SYSCTL_CHILDREN(oidp) = malloc(sizeof(struct sysctl_oid_list),
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M_SYSCTLOID, M_WAITOK);
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SLIST_INIT(SYSCTL_CHILDREN(oidp));
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} else {
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oidp->oid_arg1 = arg1;
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oidp->oid_arg2 = arg2;
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}
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oidp->oid_fmt = fmt;
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if (descr) {
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int len = strlen(descr) + 1;
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oidp->descr = malloc(len, M_SYSCTLOID, M_WAITOK);
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if (oidp->descr)
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strcpy((char *)(uintptr_t)(const void *)oidp->descr, descr);
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}
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/* Update the context, if used */
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if (clist != NULL)
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sysctl_ctx_entry_add(clist, oidp);
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/* Register this oid */
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sysctl_register_oid(oidp);
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return (oidp);
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}
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/*
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* Register the kernel's oids on startup.
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*/
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SET_DECLARE(sysctl_set, struct sysctl_oid);
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static void
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sysctl_register_all(void *arg)
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{
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struct sysctl_oid **oidp;
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SYSCTL_INIT();
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SET_FOREACH(oidp, sysctl_set)
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sysctl_register_oid(*oidp);
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}
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SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0);
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/*
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* "Staff-functions"
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*
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* These functions implement a presently undocumented interface
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* used by the sysctl program to walk the tree, and get the type
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* so it can print the value.
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* This interface is under work and consideration, and should probably
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* be killed with a big axe by the first person who can find the time.
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* (be aware though, that the proper interface isn't as obvious as it
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* may seem, there are various conflicting requirements.
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*
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* {0,0} printf the entire MIB-tree.
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* {0,1,...} return the name of the "..." OID.
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* {0,2,...} return the next OID.
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* {0,3} return the OID of the name in "new"
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* {0,4,...} return the kind & format info for the "..." OID.
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* {0,5,...} return the description the "..." OID.
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*/
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static void
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sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i)
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{
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int k;
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struct sysctl_oid *oidp;
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SLIST_FOREACH(oidp, l, oid_link) {
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for (k=0; k<i; k++)
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printf(" ");
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printf("%d %s ", oidp->oid_number, oidp->oid_name);
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printf("%c%c",
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oidp->oid_kind & CTLFLAG_RD ? 'R':' ',
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oidp->oid_kind & CTLFLAG_WR ? 'W':' ');
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if (oidp->oid_handler)
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printf(" *Handler");
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switch (oidp->oid_kind & CTLTYPE) {
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case CTLTYPE_NODE:
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printf(" Node\n");
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if (!oidp->oid_handler) {
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sysctl_sysctl_debug_dump_node(
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oidp->oid_arg1, i+2);
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}
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break;
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case CTLTYPE_INT: printf(" Int\n"); break;
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case CTLTYPE_STRING: printf(" String\n"); break;
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case CTLTYPE_QUAD: printf(" Quad\n"); break;
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case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
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default: printf("\n");
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}
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|
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}
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}
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|
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static int
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sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS)
|
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{
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int error;
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|
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error = suser(req->td);
|
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if (error)
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return error;
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sysctl_sysctl_debug_dump_node(&sysctl__children, 0);
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return ENOENT;
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}
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|
|
SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_sysctl_debug, "-", "");
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|
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static int
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sysctl_sysctl_name(SYSCTL_HANDLER_ARGS)
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{
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int *name = (int *) arg1;
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u_int namelen = arg2;
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int error = 0;
|
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struct sysctl_oid *oid;
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struct sysctl_oid_list *lsp = &sysctl__children, *lsp2;
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char buf[10];
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|
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while (namelen) {
|
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if (!lsp) {
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snprintf(buf,sizeof(buf),"%d",*name);
|
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if (req->oldidx)
|
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error = SYSCTL_OUT(req, ".", 1);
|
|
if (!error)
|
|
error = SYSCTL_OUT(req, buf, strlen(buf));
|
|
if (error)
|
|
return (error);
|
|
namelen--;
|
|
name++;
|
|
continue;
|
|
}
|
|
lsp2 = 0;
|
|
SLIST_FOREACH(oid, lsp, oid_link) {
|
|
if (oid->oid_number != *name)
|
|
continue;
|
|
|
|
if (req->oldidx)
|
|
error = SYSCTL_OUT(req, ".", 1);
|
|
if (!error)
|
|
error = SYSCTL_OUT(req, oid->oid_name,
|
|
strlen(oid->oid_name));
|
|
if (error)
|
|
return (error);
|
|
|
|
namelen--;
|
|
name++;
|
|
|
|
if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE)
|
|
break;
|
|
|
|
if (oid->oid_handler)
|
|
break;
|
|
|
|
lsp2 = (struct sysctl_oid_list *)oid->oid_arg1;
|
|
break;
|
|
}
|
|
lsp = lsp2;
|
|
}
|
|
return (SYSCTL_OUT(req, "", 1));
|
|
}
|
|
|
|
SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, "");
|
|
|
|
static int
|
|
sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen,
|
|
int *next, int *len, int level, struct sysctl_oid **oidpp)
|
|
{
|
|
struct sysctl_oid *oidp;
|
|
|
|
*len = level;
|
|
SLIST_FOREACH(oidp, lsp, oid_link) {
|
|
*next = oidp->oid_number;
|
|
*oidpp = oidp;
|
|
|
|
if (oidp->oid_kind & CTLFLAG_SKIP)
|
|
continue;
|
|
|
|
if (!namelen) {
|
|
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
|
|
return 0;
|
|
if (oidp->oid_handler)
|
|
/* We really should call the handler here...*/
|
|
return 0;
|
|
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
|
|
if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1,
|
|
len, level+1, oidpp))
|
|
return 0;
|
|
goto next;
|
|
}
|
|
|
|
if (oidp->oid_number < *name)
|
|
continue;
|
|
|
|
if (oidp->oid_number > *name) {
|
|
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
|
|
return 0;
|
|
if (oidp->oid_handler)
|
|
return 0;
|
|
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
|
|
if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1,
|
|
next+1, len, level+1, oidpp))
|
|
return (0);
|
|
goto next;
|
|
}
|
|
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
|
|
continue;
|
|
|
|
if (oidp->oid_handler)
|
|
continue;
|
|
|
|
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
|
|
if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1,
|
|
len, level+1, oidpp))
|
|
return (0);
|
|
next:
|
|
namelen = 1;
|
|
*len = level;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
sysctl_sysctl_next(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int *name = (int *) arg1;
|
|
u_int namelen = arg2;
|
|
int i, j, error;
|
|
struct sysctl_oid *oid;
|
|
struct sysctl_oid_list *lsp = &sysctl__children;
|
|
int newoid[CTL_MAXNAME];
|
|
|
|
i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid);
|
|
if (i)
|
|
return ENOENT;
|
|
error = SYSCTL_OUT(req, newoid, j * sizeof (int));
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, "");
|
|
|
|
static int
|
|
name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidpp)
|
|
{
|
|
int i;
|
|
struct sysctl_oid *oidp;
|
|
struct sysctl_oid_list *lsp = &sysctl__children;
|
|
char *p;
|
|
|
|
if (!*name)
|
|
return ENOENT;
|
|
|
|
p = name + strlen(name) - 1 ;
|
|
if (*p == '.')
|
|
*p = '\0';
|
|
|
|
*len = 0;
|
|
|
|
for (p = name; *p && *p != '.'; p++)
|
|
;
|
|
i = *p;
|
|
if (i == '.')
|
|
*p = '\0';
|
|
|
|
oidp = SLIST_FIRST(lsp);
|
|
|
|
while (oidp && *len < CTL_MAXNAME) {
|
|
if (strcmp(name, oidp->oid_name)) {
|
|
oidp = SLIST_NEXT(oidp, oid_link);
|
|
continue;
|
|
}
|
|
*oid++ = oidp->oid_number;
|
|
(*len)++;
|
|
|
|
if (!i) {
|
|
if (oidpp)
|
|
*oidpp = oidp;
|
|
return (0);
|
|
}
|
|
|
|
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
|
|
break;
|
|
|
|
if (oidp->oid_handler)
|
|
break;
|
|
|
|
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
|
|
oidp = SLIST_FIRST(lsp);
|
|
name = p+1;
|
|
for (p = name; *p && *p != '.'; p++)
|
|
;
|
|
i = *p;
|
|
if (i == '.')
|
|
*p = '\0';
|
|
}
|
|
return ENOENT;
|
|
}
|
|
|
|
static int
|
|
sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char *p;
|
|
int error, oid[CTL_MAXNAME], len;
|
|
struct sysctl_oid *op = 0;
|
|
|
|
if (!req->newlen)
|
|
return ENOENT;
|
|
if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */
|
|
return (ENAMETOOLONG);
|
|
|
|
p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK);
|
|
|
|
error = SYSCTL_IN(req, p, req->newlen);
|
|
if (error) {
|
|
free(p, M_SYSCTL);
|
|
return (error);
|
|
}
|
|
|
|
p [req->newlen] = '\0';
|
|
|
|
error = name2oid(p, oid, &len, &op);
|
|
|
|
free(p, M_SYSCTL);
|
|
|
|
if (error)
|
|
return (error);
|
|
|
|
error = SYSCTL_OUT(req, oid, len * sizeof *oid);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0,
|
|
sysctl_sysctl_name2oid, "I", "");
|
|
|
|
static int
|
|
sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sysctl_oid *oid;
|
|
int error;
|
|
|
|
error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (!oid->oid_fmt)
|
|
return (ENOENT);
|
|
error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind));
|
|
if (error)
|
|
return (error);
|
|
error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1);
|
|
return (error);
|
|
}
|
|
|
|
|
|
SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, "");
|
|
|
|
static int
|
|
sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sysctl_oid *oid;
|
|
int error;
|
|
|
|
error = sysctl_find_oid(arg1, arg2, &oid, NULL, req);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (!oid->descr)
|
|
return (ENOENT);
|
|
error = SYSCTL_OUT(req, oid->descr, strlen(oid->descr) + 1);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, "");
|
|
|
|
/*
|
|
* Default "handler" functions.
|
|
*/
|
|
|
|
/*
|
|
* Handle an int, signed or unsigned.
|
|
* Two cases:
|
|
* a variable: point arg1 at it.
|
|
* a constant: pass it in arg2.
|
|
*/
|
|
|
|
int
|
|
sysctl_handle_int(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int tmpout, error = 0;
|
|
|
|
/*
|
|
* Attempt to get a coherent snapshot by making a copy of the data.
|
|
*/
|
|
if (arg1)
|
|
tmpout = *(int *)arg1;
|
|
else
|
|
tmpout = arg2;
|
|
error = SYSCTL_OUT(req, &tmpout, sizeof(int));
|
|
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
if (!arg1)
|
|
error = EPERM;
|
|
else
|
|
error = SYSCTL_IN(req, arg1, sizeof(int));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Handle a long, signed or unsigned. arg1 points to it.
|
|
*/
|
|
|
|
int
|
|
sysctl_handle_long(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error = 0;
|
|
long tmpout;
|
|
|
|
/*
|
|
* Attempt to get a coherent snapshot by making a copy of the data.
|
|
*/
|
|
if (!arg1)
|
|
return (EINVAL);
|
|
tmpout = *(long *)arg1;
|
|
error = SYSCTL_OUT(req, &tmpout, sizeof(long));
|
|
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
error = SYSCTL_IN(req, arg1, sizeof(long));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Handle our generic '\0' terminated 'C' string.
|
|
* Two cases:
|
|
* a variable string: point arg1 at it, arg2 is max length.
|
|
* a constant string: point arg1 at it, arg2 is zero.
|
|
*/
|
|
|
|
int
|
|
sysctl_handle_string(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error=0;
|
|
char *tmparg;
|
|
size_t outlen;
|
|
|
|
/*
|
|
* Attempt to get a coherent snapshot by copying to a
|
|
* temporary kernel buffer.
|
|
*/
|
|
retry:
|
|
outlen = strlen((char *)arg1)+1;
|
|
tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK);
|
|
strncpy(tmparg, (char *)arg1, outlen);
|
|
if (tmparg[outlen-1] != '\0') {
|
|
free(tmparg, M_SYSCTLTMP);
|
|
goto retry;
|
|
}
|
|
error = SYSCTL_OUT(req, tmparg, outlen);
|
|
free(tmparg, M_SYSCTLTMP);
|
|
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
if ((req->newlen - req->newidx) >= arg2) {
|
|
error = EINVAL;
|
|
} else {
|
|
arg2 = (req->newlen - req->newidx);
|
|
error = SYSCTL_IN(req, arg1, arg2);
|
|
((char *)arg1)[arg2] = '\0';
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Handle any kind of opaque data.
|
|
* arg1 points to it, arg2 is the size.
|
|
*/
|
|
|
|
int
|
|
sysctl_handle_opaque(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
void *tmparg;
|
|
|
|
/*
|
|
* Attempt to get a coherent snapshot, either by wiring the
|
|
* user space buffer or copying to a temporary kernel buffer
|
|
* depending on the size of the data.
|
|
*/
|
|
if (arg2 > PAGE_SIZE) {
|
|
sysctl_wire_old_buffer(req, arg2);
|
|
error = SYSCTL_OUT(req, arg1, arg2);
|
|
} else {
|
|
tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK);
|
|
bcopy(arg1, tmparg, arg2);
|
|
error = SYSCTL_OUT(req, tmparg, arg2);
|
|
free(tmparg, M_SYSCTLTMP);
|
|
}
|
|
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
error = SYSCTL_IN(req, arg1, arg2);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Transfer functions to/from kernel space.
|
|
* XXX: rather untested at this point
|
|
*/
|
|
static int
|
|
sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l)
|
|
{
|
|
size_t i = 0;
|
|
|
|
if (req->oldptr) {
|
|
i = l;
|
|
if (req->oldlen <= req->oldidx)
|
|
i = 0;
|
|
else
|
|
if (i > req->oldlen - req->oldidx)
|
|
i = req->oldlen - req->oldidx;
|
|
if (i > 0)
|
|
bcopy(p, (char *)req->oldptr + req->oldidx, i);
|
|
}
|
|
req->oldidx += l;
|
|
if (req->oldptr && i != l)
|
|
return (ENOMEM);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l)
|
|
{
|
|
if (!req->newptr)
|
|
return 0;
|
|
if (req->newlen - req->newidx < l)
|
|
return (EINVAL);
|
|
bcopy((char *)req->newptr + req->newidx, p, l);
|
|
req->newidx += l;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
|
|
size_t *oldlenp, void *new, size_t newlen, size_t *retval)
|
|
{
|
|
int error = 0;
|
|
struct sysctl_req req;
|
|
|
|
bzero(&req, sizeof req);
|
|
|
|
req.td = td;
|
|
|
|
if (oldlenp) {
|
|
req.oldlen = *oldlenp;
|
|
}
|
|
|
|
if (old) {
|
|
req.oldptr= old;
|
|
}
|
|
|
|
if (new != NULL) {
|
|
req.newlen = newlen;
|
|
req.newptr = new;
|
|
}
|
|
|
|
req.oldfunc = sysctl_old_kernel;
|
|
req.newfunc = sysctl_new_kernel;
|
|
req.lock = 1;
|
|
|
|
SYSCTL_LOCK();
|
|
|
|
error = sysctl_root(0, name, namelen, &req);
|
|
|
|
if (req.lock == 2)
|
|
vsunlock(req.oldptr, req.oldlen);
|
|
|
|
SYSCTL_UNLOCK();
|
|
|
|
if (error && error != ENOMEM)
|
|
return (error);
|
|
|
|
if (retval) {
|
|
if (req.oldptr && req.oldidx > req.oldlen)
|
|
*retval = req.oldlen;
|
|
else
|
|
*retval = req.oldidx;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp,
|
|
void *new, size_t newlen, size_t *retval)
|
|
{
|
|
int oid[CTL_MAXNAME];
|
|
size_t oidlen, plen;
|
|
int error;
|
|
|
|
oid[0] = 0; /* sysctl internal magic */
|
|
oid[1] = 3; /* name2oid */
|
|
oidlen = sizeof(oid);
|
|
|
|
error = kernel_sysctl(td, oid, 2, oid, &oidlen,
|
|
(void *)name, strlen(name), &plen);
|
|
if (error)
|
|
return (error);
|
|
|
|
error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp,
|
|
new, newlen, retval);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Transfer function to/from user space.
|
|
*/
|
|
static int
|
|
sysctl_old_user(struct sysctl_req *req, const void *p, size_t l)
|
|
{
|
|
int error = 0;
|
|
size_t i = 0;
|
|
|
|
if (req->lock == 1 && req->oldptr)
|
|
WITNESS_SLEEP(1, NULL);
|
|
if (req->oldptr) {
|
|
i = l;
|
|
if (req->oldlen <= req->oldidx)
|
|
i = 0;
|
|
else
|
|
if (i > req->oldlen - req->oldidx)
|
|
i = req->oldlen - req->oldidx;
|
|
if (i > 0)
|
|
error = copyout(p, (char *)req->oldptr + req->oldidx,
|
|
i);
|
|
}
|
|
req->oldidx += l;
|
|
if (error)
|
|
return (error);
|
|
if (req->oldptr && i < l)
|
|
return (ENOMEM);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
sysctl_new_user(struct sysctl_req *req, void *p, size_t l)
|
|
{
|
|
int error;
|
|
|
|
if (!req->newptr)
|
|
return 0;
|
|
if (req->newlen - req->newidx < l)
|
|
return (EINVAL);
|
|
error = copyin((char *)req->newptr + req->newidx, p, l);
|
|
req->newidx += l;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Wire the user space destination buffer. If set to a value greater than
|
|
* zero, the len parameter limits the maximum amount of wired memory.
|
|
*
|
|
* XXX - The len parameter is currently ignored due to the lack of
|
|
* a place to save it in the sysctl_req structure so that the matching
|
|
* amount of memory can be unwired in the sysctl exit code.
|
|
*/
|
|
void
|
|
sysctl_wire_old_buffer(struct sysctl_req *req, size_t len)
|
|
{
|
|
if (req->lock == 1 && req->oldptr && req->oldfunc == sysctl_old_user) {
|
|
vslock(req->oldptr, req->oldlen);
|
|
req->lock = 2;
|
|
}
|
|
}
|
|
|
|
int
|
|
sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
|
|
int *nindx, struct sysctl_req *req)
|
|
{
|
|
struct sysctl_oid *oid;
|
|
int indx;
|
|
|
|
oid = SLIST_FIRST(&sysctl__children);
|
|
indx = 0;
|
|
while (oid && indx < CTL_MAXNAME) {
|
|
if (oid->oid_number == name[indx]) {
|
|
indx++;
|
|
if (oid->oid_kind & CTLFLAG_NOLOCK)
|
|
req->lock = 0;
|
|
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
|
|
if (oid->oid_handler != NULL ||
|
|
indx == namelen) {
|
|
*noid = oid;
|
|
if (nindx != NULL)
|
|
*nindx = indx;
|
|
return (0);
|
|
}
|
|
oid = SLIST_FIRST(
|
|
(struct sysctl_oid_list *)oid->oid_arg1);
|
|
} else if (indx == namelen) {
|
|
*noid = oid;
|
|
if (nindx != NULL)
|
|
*nindx = indx;
|
|
return (0);
|
|
} else {
|
|
return (ENOTDIR);
|
|
}
|
|
} else {
|
|
oid = SLIST_NEXT(oid, oid_link);
|
|
}
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
/*
|
|
* Traverse our tree, and find the right node, execute whatever it points
|
|
* to, and return the resulting error code.
|
|
*/
|
|
|
|
int
|
|
sysctl_root(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sysctl_oid *oid;
|
|
int error, indx;
|
|
|
|
error = sysctl_find_oid(arg1, arg2, &oid, &indx, req);
|
|
if (error)
|
|
return (error);
|
|
|
|
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
|
|
/*
|
|
* You can't call a sysctl when it's a node, but has
|
|
* no handler. Inform the user that it's a node.
|
|
* The indx may or may not be the same as namelen.
|
|
*/
|
|
if (oid->oid_handler == NULL)
|
|
return (EISDIR);
|
|
}
|
|
|
|
/* Is this sysctl writable? */
|
|
if (req->newptr && !(oid->oid_kind & CTLFLAG_WR))
|
|
return (EPERM);
|
|
|
|
KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL"));
|
|
|
|
/* Is this sysctl sensitive to securelevels? */
|
|
if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) {
|
|
error = securelevel_gt(req->td->td_ucred, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/* Is this sysctl writable by only privileged users? */
|
|
if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) {
|
|
int flags;
|
|
|
|
if (oid->oid_kind & CTLFLAG_PRISON)
|
|
flags = PRISON_ROOT;
|
|
else
|
|
flags = 0;
|
|
error = suser_cred(req->td->td_ucred, flags);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
if (!oid->oid_handler)
|
|
return EINVAL;
|
|
|
|
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE)
|
|
error = oid->oid_handler(oid, (int *)arg1 + indx, arg2 - indx,
|
|
req);
|
|
else
|
|
error = oid->oid_handler(oid, oid->oid_arg1, oid->oid_arg2,
|
|
req);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sysctl_args {
|
|
int *name;
|
|
u_int namelen;
|
|
void *old;
|
|
size_t *oldlenp;
|
|
void *new;
|
|
size_t newlen;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
__sysctl(struct thread *td, struct sysctl_args *uap)
|
|
{
|
|
int error, name[CTL_MAXNAME];
|
|
size_t j;
|
|
|
|
if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
|
|
return (EINVAL);
|
|
|
|
error = copyin(uap->name, &name, uap->namelen * sizeof(int));
|
|
if (error)
|
|
return (error);
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
error = userland_sysctl(td, name, uap->namelen,
|
|
uap->old, uap->oldlenp, 0,
|
|
uap->new, uap->newlen, &j);
|
|
if (error && error != ENOMEM)
|
|
goto done2;
|
|
if (uap->oldlenp) {
|
|
int i = copyout(&j, uap->oldlenp, sizeof(j));
|
|
if (i)
|
|
error = i;
|
|
}
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* This is used from various compatibility syscalls too. That's why name
|
|
* must be in kernel space.
|
|
*/
|
|
int
|
|
userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
|
|
size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval)
|
|
{
|
|
int error = 0;
|
|
struct sysctl_req req, req2;
|
|
|
|
bzero(&req, sizeof req);
|
|
|
|
req.td = td;
|
|
|
|
if (oldlenp) {
|
|
if (inkernel) {
|
|
req.oldlen = *oldlenp;
|
|
} else {
|
|
error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp));
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
if (old) {
|
|
if (!useracc(old, req.oldlen, VM_PROT_WRITE))
|
|
return (EFAULT);
|
|
req.oldptr= old;
|
|
}
|
|
|
|
if (new != NULL) {
|
|
if (!useracc(new, req.newlen, VM_PROT_READ))
|
|
return (EFAULT);
|
|
req.newlen = newlen;
|
|
req.newptr = new;
|
|
}
|
|
|
|
req.oldfunc = sysctl_old_user;
|
|
req.newfunc = sysctl_new_user;
|
|
req.lock = 1;
|
|
|
|
SYSCTL_LOCK();
|
|
|
|
do {
|
|
req2 = req;
|
|
error = sysctl_root(0, name, namelen, &req2);
|
|
} while (error == EAGAIN);
|
|
|
|
req = req2;
|
|
if (req.lock == 2)
|
|
vsunlock(req.oldptr, req.oldlen);
|
|
|
|
SYSCTL_UNLOCK();
|
|
|
|
if (error && error != ENOMEM)
|
|
return (error);
|
|
|
|
if (retval) {
|
|
if (req.oldptr && req.oldidx > req.oldlen)
|
|
*retval = req.oldlen;
|
|
else
|
|
*retval = req.oldidx;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#ifdef COMPAT_43
|
|
#include <sys/socket.h>
|
|
#include <vm/vm_param.h>
|
|
|
|
#define KINFO_PROC (0<<8)
|
|
#define KINFO_RT (1<<8)
|
|
#define KINFO_VNODE (2<<8)
|
|
#define KINFO_FILE (3<<8)
|
|
#define KINFO_METER (4<<8)
|
|
#define KINFO_LOADAVG (5<<8)
|
|
#define KINFO_CLOCKRATE (6<<8)
|
|
|
|
/* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
|
|
#define KINFO_BSDI_SYSINFO (101<<8)
|
|
|
|
/*
|
|
* XXX this is bloat, but I hope it's better here than on the potentially
|
|
* limited kernel stack... -Peter
|
|
*/
|
|
|
|
static struct {
|
|
int bsdi_machine; /* "i386" on BSD/386 */
|
|
/* ^^^ this is an offset to the string, relative to the struct start */
|
|
char *pad0;
|
|
long pad1;
|
|
long pad2;
|
|
long pad3;
|
|
u_long pad4;
|
|
u_long pad5;
|
|
u_long pad6;
|
|
|
|
int bsdi_ostype; /* "BSD/386" on BSD/386 */
|
|
int bsdi_osrelease; /* "1.1" on BSD/386 */
|
|
long pad7;
|
|
long pad8;
|
|
char *pad9;
|
|
|
|
long pad10;
|
|
long pad11;
|
|
int pad12;
|
|
long pad13;
|
|
quad_t pad14;
|
|
long pad15;
|
|
|
|
struct timeval pad16;
|
|
/* we dont set this, because BSDI's uname used gethostname() instead */
|
|
int bsdi_hostname; /* hostname on BSD/386 */
|
|
|
|
/* the actual string data is appended here */
|
|
|
|
} bsdi_si;
|
|
/*
|
|
* this data is appended to the end of the bsdi_si structure during copyout.
|
|
* The "char *" offsets are relative to the base of the bsdi_si struct.
|
|
* This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
|
|
* should not exceed the length of the buffer here... (or else!! :-)
|
|
*/
|
|
static char bsdi_strings[80]; /* It had better be less than this! */
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getkerninfo_args {
|
|
int op;
|
|
char *where;
|
|
size_t *size;
|
|
int arg;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
ogetkerninfo(struct thread *td, struct getkerninfo_args *uap)
|
|
{
|
|
int error, name[6];
|
|
size_t size;
|
|
u_int needed = 0;
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
switch (uap->op & 0xff00) {
|
|
|
|
case KINFO_RT:
|
|
name[0] = CTL_NET;
|
|
name[1] = PF_ROUTE;
|
|
name[2] = 0;
|
|
name[3] = (uap->op & 0xff0000) >> 16;
|
|
name[4] = uap->op & 0xff;
|
|
name[5] = uap->arg;
|
|
error = userland_sysctl(td, name, 6, uap->where, uap->size,
|
|
0, 0, 0, &size);
|
|
break;
|
|
|
|
case KINFO_VNODE:
|
|
name[0] = CTL_KERN;
|
|
name[1] = KERN_VNODE;
|
|
error = userland_sysctl(td, name, 2, uap->where, uap->size,
|
|
0, 0, 0, &size);
|
|
break;
|
|
|
|
case KINFO_PROC:
|
|
name[0] = CTL_KERN;
|
|
name[1] = KERN_PROC;
|
|
name[2] = uap->op & 0xff;
|
|
name[3] = uap->arg;
|
|
error = userland_sysctl(td, name, 4, uap->where, uap->size,
|
|
0, 0, 0, &size);
|
|
break;
|
|
|
|
case KINFO_FILE:
|
|
name[0] = CTL_KERN;
|
|
name[1] = KERN_FILE;
|
|
error = userland_sysctl(td, name, 2, uap->where, uap->size,
|
|
0, 0, 0, &size);
|
|
break;
|
|
|
|
case KINFO_METER:
|
|
name[0] = CTL_VM;
|
|
name[1] = VM_METER;
|
|
error = userland_sysctl(td, name, 2, uap->where, uap->size,
|
|
0, 0, 0, &size);
|
|
break;
|
|
|
|
case KINFO_LOADAVG:
|
|
name[0] = CTL_VM;
|
|
name[1] = VM_LOADAVG;
|
|
error = userland_sysctl(td, name, 2, uap->where, uap->size,
|
|
0, 0, 0, &size);
|
|
break;
|
|
|
|
case KINFO_CLOCKRATE:
|
|
name[0] = CTL_KERN;
|
|
name[1] = KERN_CLOCKRATE;
|
|
error = userland_sysctl(td, name, 2, uap->where, uap->size,
|
|
0, 0, 0, &size);
|
|
break;
|
|
|
|
case KINFO_BSDI_SYSINFO: {
|
|
/*
|
|
* this is pretty crude, but it's just enough for uname()
|
|
* from BSDI's 1.x libc to work.
|
|
*
|
|
* *size gives the size of the buffer before the call, and
|
|
* the amount of data copied after a successful call.
|
|
* If successful, the return value is the amount of data
|
|
* available, which can be larger than *size.
|
|
*
|
|
* BSDI's 2.x product apparently fails with ENOMEM if *size
|
|
* is too small.
|
|
*/
|
|
|
|
u_int left;
|
|
char *s;
|
|
|
|
bzero((char *)&bsdi_si, sizeof(bsdi_si));
|
|
bzero(bsdi_strings, sizeof(bsdi_strings));
|
|
|
|
s = bsdi_strings;
|
|
|
|
bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
|
|
strcpy(s, ostype);
|
|
s += strlen(s) + 1;
|
|
|
|
bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
|
|
strcpy(s, osrelease);
|
|
s += strlen(s) + 1;
|
|
|
|
bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
|
|
strcpy(s, machine);
|
|
s += strlen(s) + 1;
|
|
|
|
needed = sizeof(bsdi_si) + (s - bsdi_strings);
|
|
|
|
if ((uap->where == NULL) || (uap->size == NULL)) {
|
|
/* process is asking how much buffer to supply.. */
|
|
size = needed;
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
|
|
break;
|
|
|
|
/* if too much buffer supplied, trim it down */
|
|
if (size > needed)
|
|
size = needed;
|
|
|
|
/* how much of the buffer is remaining */
|
|
left = size;
|
|
|
|
if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
|
|
break;
|
|
|
|
/* is there any point in continuing? */
|
|
if (left > sizeof(bsdi_si)) {
|
|
left -= sizeof(bsdi_si);
|
|
error = copyout(&bsdi_strings,
|
|
uap->where + sizeof(bsdi_si), left);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if (error == 0) {
|
|
td->td_retval[0] = needed ? needed : size;
|
|
if (uap->size) {
|
|
error = copyout(&size, uap->size, sizeof(size));
|
|
}
|
|
}
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 */
|