[apple/xnu.git] / bsd / kern / kern_sysctl.c

/*
 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*-
 * Copyright (c) 1982, 1986, 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Mike Karels at Berkeley Software Design, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)kern_sysctl.c       8.4 (Berkeley) 4/14/94
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */

/*
* DEPRECATED sysctl system call code
 *
 * Everything in this file is deprecated. Sysctls should be handled
 * by the code in kern_newsysctl.c.
 * The remaining "case" sections are supposed to be converted into
 * SYSCTL_*-style definitions, and as soon as all of them are gone,
 * this source file is supposed to die.
 *
 * DO NOT ADD ANY MORE "case" SECTIONS TO THIS FILE, instead define
 * your sysctl with SYSCTL_INT, SYSCTL_PROC etc. in your source file.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/file_internal.h>
#include <sys/vnode_internal.h>
#include <sys/unistd.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/namei.h>
#include <sys/tty.h>
#include <sys/disklabel.h>
#include <sys/vm.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <sys/aio_kern.h>
#include <sys/reboot.h>

#include <security/audit/audit.h>
#include <kern/kalloc.h>

#include <mach/machine.h>
#include <mach/mach_types.h>
#include <mach/vm_param.h>
#include <kern/mach_param.h>
#include <kern/task.h>
#include <kern/lock.h>
#include <kern/debug.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <mach/host_info.h>

#include <sys/mount_internal.h>
#include <sys/kdebug.h>
#include <sys/sysproto.h>

#include <IOKit/IOPlatformExpert.h>
#include <pexpert/pexpert.h>

#include <machine/machine_routines.h>
#include <machine/exec.h>

#include <vm/vm_protos.h>

#if defined(__i386__) || defined(__x86_64__)
#include <i386/cpuid.h>
#endif

sysctlfn kern_sysctl;
#if DEBUG
sysctlfn debug_sysctl;
#endif
extern sysctlfn net_sysctl;
extern sysctlfn cpu_sysctl;
extern int aio_max_requests;                            
extern int aio_max_requests_per_process;        
extern int aio_worker_threads;                          
extern int lowpri_IO_window_msecs;
extern int lowpri_IO_delay_msecs;
extern int nx_enabled;
extern int speculative_reads_disabled;
extern unsigned int preheat_pages_max;
extern unsigned int preheat_pages_min;
extern unsigned int preheat_pages_mult;
extern long numvnodes;

static void
fill_user32_eproc(proc_t p, struct user32_eproc *ep);
static void
fill_user32_externproc(proc_t p, struct user32_extern_proc *exp);
static void
fill_user64_eproc(proc_t p, struct user64_eproc *ep);
static void
fill_user64_proc(proc_t p, struct user64_kinfo_proc *kp);
static void
fill_user64_externproc(proc_t p, struct user64_extern_proc *exp);
extern int 
kdbg_control(int *name, u_int namelen, user_addr_t where, size_t * sizep);
int
kdebug_ops(int *name, u_int namelen, user_addr_t where, size_t *sizep, proc_t p);
#if NFSCLIENT
extern int 
netboot_root(void);
#endif
int
pcsamples_ops(int *name, u_int namelen, user_addr_t where, size_t *sizep, 
              proc_t p);
__private_extern__ kern_return_t
reset_vmobjectcache(unsigned int val1, unsigned int val2);
int
sysctl_doproc(int *name, u_int namelen, user_addr_t where, size_t *sizep);
int 
sysctl_doprof(int *name, u_int namelen, user_addr_t oldp, size_t *oldlenp, 
                          user_addr_t newp, size_t newlen);
static void
fill_user32_proc(proc_t p, struct user32_kinfo_proc *kp);
int
sysctl_procargs(int *name, u_int namelen, user_addr_t where, 
                                size_t *sizep, proc_t cur_proc);
static int
sysctl_procargs2(int *name, u_int namelen, user_addr_t where, size_t *sizep, 
                 proc_t cur_proc);
static int
sysctl_procargsx(int *name, u_int namelen, user_addr_t where, size_t *sizep, 
                 proc_t cur_proc, int argc_yes);
int
sysctl_struct(user_addr_t oldp, size_t *oldlenp, user_addr_t newp, 
              size_t newlen, void *sp, int len);

static int sysdoproc_filt_KERN_PROC_PID(proc_t p, void * arg);
static int sysdoproc_filt_KERN_PROC_PGRP(proc_t p, void * arg);
static int sysdoproc_filt_KERN_PROC_TTY(proc_t p, void * arg);
static int  sysdoproc_filt_KERN_PROC_UID(proc_t p, void * arg);
static int  sysdoproc_filt_KERN_PROC_RUID(proc_t p, void * arg);
#if CONFIG_LCTX
static int  sysdoproc_filt_KERN_PROC_LCID(proc_t p, void * arg);
#endif
int sysdoproc_callback(proc_t p, void *arg);

static int __sysctl_funneled(proc_t p, struct __sysctl_args *uap, int32_t *retval);

extern void IORegistrySetOSBuildVersion(char * build_version); 

static void
fill_loadavg64(struct loadavg *la, struct user64_loadavg *la64)
{
        la64->ldavg[0]  = la->ldavg[0];
        la64->ldavg[1]  = la->ldavg[1];
        la64->ldavg[2]  = la->ldavg[2];
        la64->fscale    = (user64_long_t)la->fscale;
}

static void
fill_loadavg32(struct loadavg *la, struct user32_loadavg *la32)
{
        la32->ldavg[0]  = la->ldavg[0];
        la32->ldavg[1]  = la->ldavg[1];
        la32->ldavg[2]  = la->ldavg[2];
        la32->fscale    = (user32_long_t)la->fscale;
}

/*
 * Locking and stats
 */
static struct sysctl_lock memlock;

/* sysctl() syscall */
int
__sysctl(proc_t p, struct __sysctl_args *uap, int32_t *retval)
{
        boolean_t funnel_state;
        int error;

        funnel_state = thread_funnel_set(kernel_flock, TRUE);
        error = __sysctl_funneled(p, uap, retval);
        thread_funnel_set(kernel_flock, funnel_state);
        return(error);
}

static int
__sysctl_funneled(proc_t p, struct __sysctl_args *uap, __unused int32_t *retval)
{
        int error, dolock = 1;
        size_t savelen = 0, oldlen = 0, newlen;
        sysctlfn *fnp = NULL;
        int name[CTL_MAXNAME];
        int error1;
        boolean_t memlock_taken = FALSE;
        boolean_t vslock_taken = FALSE;
#if CONFIG_MACF
        kauth_cred_t my_cred;
#endif

        /*
         * all top-level sysctl names are non-terminal
         */
        if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
                return (EINVAL);
        error = copyin(uap->name, &name[0], uap->namelen * sizeof(int));
        if (error)
                return (error);
                
        AUDIT_ARG(ctlname, name, uap->namelen);

        if (proc_is64bit(p)) {
                /* uap->newlen is a size_t value which grows to 64 bits 
                 * when coming from a 64-bit process.  since it's doubtful we'll 
                 * have a sysctl newp buffer greater than 4GB we shrink it to size_t
                 */
                newlen = CAST_DOWN(size_t, uap->newlen);
        }
        else {
                newlen = uap->newlen;
        }
        
        /* CTL_UNSPEC is used to get oid to AUTO_OID */
        if (uap->new != USER_ADDR_NULL
            && ((name[0] == CTL_KERN
                && !(name[1] == KERN_IPC || name[1] == KERN_PANICINFO || name[1] == KERN_PROCDELAYTERM || 
                     name[1] == KERN_PROCNAME || name[1] == KERN_RAGEVNODE || name[1] == KERN_CHECKOPENEVT || name[1] == KERN_THREADNAME))
            || (name[0] == CTL_HW)
            || (name[0] == CTL_VM))
            && (error = suser(kauth_cred_get(), &p->p_acflag)))
                return (error);

/* XXX: KERN, VFS and DEBUG are handled by their respective functions,
 * but there is a fallback for all sysctls other than VFS to
 * userland_sysctl() - KILL THIS! */
        switch (name[0]) {
        case CTL_KERN:
                fnp = kern_sysctl;
                if ((name[1] != KERN_VNODE) && (name[1] != KERN_FILE) 
                        && (name[1] != KERN_PROC))
                        dolock = 0;
                break;
        case CTL_VFS:
                fnp = vfs_sysctl;
                break;
#if DEBUG
        case CTL_DEBUG:
                fnp = debug_sysctl;
                break;
#endif
        default:
                fnp = NULL;
        }

        if (uap->oldlenp != USER_ADDR_NULL) {
                uint64_t        oldlen64 = fuulong(uap->oldlenp);

                oldlen = CAST_DOWN(size_t, oldlen64);
                /*
                 * If more than 4G, clamp to 4G - useracc() below will catch
                 * with an EFAULT, if it's actually necessary.
                 */
                if (oldlen64 > 0x00000000ffffffffULL)
                        oldlen = 0xffffffffUL;
        }

        if (uap->old != USER_ADDR_NULL) {
                if (!useracc(uap->old, (user_size_t)oldlen, B_WRITE))
                        return (EFAULT);
                /*
                 * The kernel debug mechanism does not need to take this lock, and
                 * we don't grab the memlock around calls to KERN_PROC because it is reentrant.
                 * Grabbing the lock for a KERN_PROC sysctl makes a deadlock possible 5024049.
                 */
                if (!((name[1] == KERN_KDEBUG) && (name[2] == KERN_KDGETENTROPY)) &&
                    !(name[1] == KERN_PROC)) {
                        MEMLOCK_LOCK();
                        memlock_taken = TRUE;
                }

                if (dolock && oldlen) {
                        if ((error = vslock(uap->old, (user_size_t)oldlen))) {
                                if (memlock_taken == TRUE)
                                        MEMLOCK_UNLOCK();
                                return(error);
                        }
                        savelen = oldlen;
                        vslock_taken = TRUE;
                }
        }

#if CONFIG_MACF
        my_cred = kauth_cred_proc_ref(p);
        error = mac_system_check_sysctl(
            my_cred, 
            (int *) name,
            uap->namelen,
            uap->old,
            uap->oldlenp,
            fnp == kern_sysctl ? 1 : 0,
            uap->new,
            newlen
        );
        kauth_cred_unref(&my_cred);
        if (!error) {
#endif
        if (fnp) {
                error = (*fnp)(name + 1, uap->namelen - 1, uap->old,
                       &oldlen, uap->new, newlen, p);
        }
        else
                error = ENOTSUP;
#if CONFIG_MACF
        }
#endif

        if (vslock_taken == TRUE) {
                error1 = vsunlock(uap->old, (user_size_t)savelen, B_WRITE);
                if (!error)
                        error = error1;
        }
        if (memlock_taken == TRUE)
                MEMLOCK_UNLOCK();

        if ( (name[0] != CTL_VFS) && (error == ENOTSUP)) {
                size_t  tmp = oldlen;
                boolean_t funnel_state;

                /*
                 * Drop the funnel when calling new sysctl code, which will conditionally
                 * grab the funnel if it really needs to.
                 */
                funnel_state = thread_funnel_set(kernel_flock, FALSE);
                
                error = userland_sysctl(p, name, uap->namelen, uap->old, &tmp, 
                                        uap->new, newlen, &oldlen);

                thread_funnel_set(kernel_flock, funnel_state);
        }

        if ((error) && (error != ENOMEM))
                return (error);

        if (uap->oldlenp != USER_ADDR_NULL)
                error = suulong(uap->oldlenp, oldlen);

        return (error);
}

/*
 * Attributes stored in the kernel.
 */
__private_extern__ char corefilename[MAXPATHLEN+1];
__private_extern__ int do_coredump;
__private_extern__ int sugid_coredump;

#if COUNT_SYSCALLS
__private_extern__ int do_count_syscalls;
#endif

#ifdef INSECURE
int securelevel = -1;
#else
int securelevel;
#endif

static int
sysctl_affinity(
        int *name,
        u_int namelen,
        user_addr_t oldBuf,
        size_t *oldSize,
        user_addr_t newBuf,
        __unused size_t newSize,
        proc_t cur_proc)
{
        if (namelen < 1)
                return (ENOTSUP);

        if (name[0] == 0 && 1 == namelen) {
                return sysctl_rdint(oldBuf, oldSize, newBuf,
                                        (cur_proc->p_flag & P_AFFINITY) ? 1 : 0);
        } else if (name[0] == 1 && 2 == namelen) {
                if (name[1] == 0) {
                        OSBitAndAtomic(~((uint32_t)P_AFFINITY), &cur_proc->p_flag);
                } else {
                        OSBitOrAtomic(P_AFFINITY, &cur_proc->p_flag);
                }
                return 0;
        }
        return (ENOTSUP);
}

static int
sysctl_translate(
        int *name,
        u_int namelen,
        user_addr_t oldBuf,
        size_t *oldSize,
        user_addr_t newBuf,
        __unused size_t newSize,
        proc_t cur_proc)
{
        proc_t p;
        int istranslated = 0;
        kauth_cred_t my_cred;
        uid_t uid;

        if (namelen != 1)
                return (ENOTSUP);

        p = proc_find(name[0]);
        if (p == NULL)
                return (EINVAL);

        my_cred = kauth_cred_proc_ref(p);
        uid = kauth_cred_getuid(my_cred);
        kauth_cred_unref(&my_cred);
        if ((uid != kauth_cred_getuid(kauth_cred_get())) 
                && suser(kauth_cred_get(), &cur_proc->p_acflag)) {
                proc_rele(p);
                return (EPERM);
        }

        istranslated = (p->p_flag & P_TRANSLATED);
        proc_rele(p);
        return sysctl_rdint(oldBuf, oldSize, newBuf,
                                (istranslated != 0) ? 1 : 0);
}

int
set_archhandler(__unused proc_t p, int arch)
{
        int error;
        struct nameidata nd;
        struct vnode_attr va;
        vfs_context_t ctx = vfs_context_current();
        struct exec_archhandler *archhandler;

        switch(arch) {
        case CPU_TYPE_POWERPC:
                archhandler = &exec_archhandler_ppc;
                break;
        default:
                return (EBADARCH);
        }

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
                   CAST_USER_ADDR_T(archhandler->path), ctx);
        error = namei(&nd);
        if (error)
                return (error);
        nameidone(&nd);
        
        /* Check mount point */
        if ((nd.ni_vp->v_mount->mnt_flag & MNT_NOEXEC) ||
                (nd.ni_vp->v_type != VREG)) {
                vnode_put(nd.ni_vp);
                return (EACCES);
        }
        
        VATTR_INIT(&va);
        VATTR_WANTED(&va, va_fsid);
        VATTR_WANTED(&va, va_fileid);
        error = vnode_getattr(nd.ni_vp, &va, ctx);
        if (error) {
                vnode_put(nd.ni_vp);
                return (error);
        }
        vnode_put(nd.ni_vp);
        
        archhandler->fsid = va.va_fsid;
        archhandler->fileid = (u_int32_t)va.va_fileid;
        return 0;
}

/* XXX remove once Rosetta is rev'ed */
/*****************************************************************************/
static int
sysctl_exec_archhandler_ppc(
        __unused int *name,
        __unused u_int namelen,
        user_addr_t oldBuf,
        size_t *oldSize,
        user_addr_t newBuf,
        size_t newSize,
        proc_t p)
{
        int error;
        size_t len;
        char handler[sizeof(exec_archhandler_ppc.path)];
        vfs_context_t ctx = vfs_context_current();

        if (oldSize) {
                len = strlen(exec_archhandler_ppc.path) + 1;
                if (oldBuf) {
                        if (*oldSize < len)
                                return (ENOMEM);
                        error = copyout(exec_archhandler_ppc.path, oldBuf, len);
                        if (error)
                                return (error);
                }
                *oldSize = len - 1;
        }
        if (newBuf) {
                error = suser(vfs_context_ucred(ctx), &p->p_acflag);
                if (error)
                        return (error);
                if (newSize >= sizeof(exec_archhandler_ppc.path))
                        return (ENAMETOOLONG);
                error = copyin(newBuf, handler, newSize);
                if (error)
                        return (error);
                handler[newSize] = 0;
                strlcpy(exec_archhandler_ppc.path, handler, MAXPATHLEN);
                error = set_archhandler(p, CPU_TYPE_POWERPC);
                if (error)
                        return (error);
        }
        return 0;
}
/*****************************************************************************/

static int
sysctl_handle_exec_archhandler_ppc(struct sysctl_oid *oidp, void *arg1,
                int arg2, struct sysctl_req *req)
{
        int error = 0;

        error = sysctl_handle_string(oidp, arg1, arg2, req);

        if (error)
                goto done;

        if (req->newptr)
                error = set_archhandler(req->p, CPU_TYPE_POWERPC);

done:
        return error;

}

static int
sysctl_handle_kern_threadname(  __unused struct sysctl_oid *oidp, __unused void *arg1,
              __unused int arg2, struct sysctl_req *req)
{
        int error;
        struct uthread *ut = get_bsdthread_info(current_thread());
        user_addr_t oldp=0, newp=0;
        size_t *oldlenp=NULL;
        size_t newlen=0;

        oldp = req->oldptr;
        oldlenp = &(req->oldlen);
        newp = req->newptr;
        newlen = req->newlen;

        /* We want the current length, and maybe the string itself */
        if(oldlenp) {
                /* if we have no thread name yet tell'em we want MAXTHREADNAMESIZE - 1 */
                size_t currlen = MAXTHREADNAMESIZE - 1;
                
                if(ut->pth_name)
                        /* use length of current thread name */
                        currlen = strlen(ut->pth_name);
                if(oldp) {
                        if(*oldlenp < currlen)
                                return ENOMEM;
                        /* NOTE - we do not copy the NULL terminator */
                        if(ut->pth_name) {
                                error = copyout(ut->pth_name,oldp,currlen);
                                if(error)
                                        return error;
                        }
                }       
                /* return length of thread name minus NULL terminator (just like strlen)  */
                req->oldidx = currlen;
        }

        /* We want to set the name to something */
        if(newp) 
        {
                if(newlen > (MAXTHREADNAMESIZE - 1))
                        return ENAMETOOLONG;
                if(!ut->pth_name)
                {
                        ut->pth_name = (char*)kalloc( MAXTHREADNAMESIZE );
                        if(!ut->pth_name)
                                return ENOMEM;
                }
                bzero(ut->pth_name, MAXTHREADNAMESIZE);
                error = copyin(newp, ut->pth_name, newlen);
                if(error)
                        return error;
        }
                
        return 0;
}

SYSCTL_PROC(_kern, KERN_THREADNAME, threadname, CTLFLAG_ANYBODY | CTLTYPE_STRING | CTLFLAG_RW, 0, 0, sysctl_handle_kern_threadname,"A","");

SYSCTL_NODE(_kern, KERN_EXEC, exec, CTLFLAG_RD|CTLFLAG_LOCKED, 0, "");

SYSCTL_NODE(_kern_exec, OID_AUTO, archhandler, CTLFLAG_RD|CTLFLAG_LOCKED, 0, "");

SYSCTL_PROC(_kern_exec_archhandler, OID_AUTO, powerpc,
            CTLTYPE_STRING | CTLFLAG_RW, exec_archhandler_ppc.path, 0,
            sysctl_handle_exec_archhandler_ppc, "A", "");

extern int get_kernel_symfile(proc_t, char **);
__private_extern__ int 
sysctl_dopanicinfo(int *, u_int, user_addr_t, size_t *, user_addr_t, 
                   size_t, proc_t);

/*
 * kernel related system variables.
 */
int
kern_sysctl(int *name, u_int namelen, user_addr_t oldp, size_t *oldlenp, 
            user_addr_t newp, size_t newlen, proc_t p)
{
        /* all sysctl names not listed below are terminal at this level */
        if (namelen != 1
                && !(name[0] == KERN_PROC
                        || name[0] == KERN_PROF 
                        || name[0] == KERN_KDEBUG
#if !CONFIG_EMBEDDED
                        || name[0] == KERN_PROCARGS
#endif
                        || name[0] == KERN_PROCARGS2
                        || name[0] == KERN_IPC
                        || name[0] == KERN_SYSV
                        || name[0] == KERN_AFFINITY
                        || name[0] == KERN_TRANSLATE
                        || name[0] == KERN_EXEC
                        || name[0] == KERN_PANICINFO
                        || name[0] == KERN_POSIX
                        || name[0] == KERN_TFP
                        || name[0] == KERN_TTY
#if CONFIG_LCTX
                        || name[0] == KERN_LCTX
#endif
                                                )
                )
                return (ENOTDIR);               /* overloaded */

        switch (name[0]) {
        case KERN_PROC:
                return (sysctl_doproc(name + 1, namelen - 1, oldp, oldlenp));
#ifdef GPROF
        case KERN_PROF:
                return (sysctl_doprof(name + 1, namelen - 1, oldp, oldlenp,
                    newp, newlen));
#endif
        case KERN_KDEBUG:
                return (kdebug_ops(name + 1, namelen - 1, oldp, oldlenp, p));
#if !CONFIG_EMBEDDED
        case KERN_PROCARGS:
                /* new one as it does not use kinfo_proc */
                return (sysctl_procargs(name + 1, namelen - 1, oldp, oldlenp, p));
#endif
        case KERN_PROCARGS2:
                /* new one as it does not use kinfo_proc */
                return (sysctl_procargs2(name + 1, namelen - 1, oldp, oldlenp, p));
#if PANIC_INFO
        case KERN_PANICINFO:
                return(sysctl_dopanicinfo(name + 1, namelen - 1, oldp, oldlenp,
                        newp, newlen, p));
#endif
        case KERN_AFFINITY:
                return sysctl_affinity(name+1, namelen-1, oldp, oldlenp,
                                                                        newp, newlen, p);
        case KERN_TRANSLATE:
                return sysctl_translate(name+1, namelen-1, oldp, oldlenp, newp,
                                      newlen, p);

                /* XXX remove once Rosetta has rev'ed */
        case KERN_EXEC:
                return sysctl_exec_archhandler_ppc(name+1, namelen-1, oldp,
                                                   oldlenp, newp, newlen, p);
#if COUNT_SYSCALLS
        case KERN_COUNT_SYSCALLS:
        {
                /* valid values passed in:
                 * = 0 means don't keep called counts for each bsd syscall
                 * > 0 means keep called counts for each bsd syscall
                 * = 2 means dump current counts to the system log
                 * = 3 means reset all counts
                 * for example, to dump current counts:  
                 *              sysctl -w kern.count_calls=2
                 */
                error = sysctl_int(oldp, oldlenp, newp, newlen, &tmp);
                if ( error != 0 ) {
                        return (error);
                }
                        
                if ( tmp == 1 ) {
                        do_count_syscalls = 1;
                }
                else if ( tmp == 0 || tmp == 2 || tmp == 3 ) {
                        extern int                      nsysent;
                        extern int                      syscalls_log[];
                        extern const char *     syscallnames[];
                        int                     i;
                        for ( i = 0; i < nsysent; i++ ) {
                                if ( syscalls_log[i] != 0 ) {
                                        if ( tmp == 2 ) {
                                                printf("%d calls - name %s \n", syscalls_log[i], syscallnames[i]);
                                        }
                                        else {
                                                syscalls_log[i] = 0;
                                        }
                                }
                        }
                        if ( tmp != 0 ) {
                                do_count_syscalls = 1;
                        }
                }
                return (0);
        }
#endif
        default:
                return (ENOTSUP);
        }
        /* NOTREACHED */
}

#if DEBUG
/*
 * Debugging related system variables.
 */
#if DIAGNOSTIC
extern
#endif /* DIAGNOSTIC */
struct ctldebug debug0, debug1;
struct ctldebug debug2, debug3, debug4;
struct ctldebug debug5, debug6, debug7, debug8, debug9;
struct ctldebug debug10, debug11, debug12, debug13, debug14;
struct ctldebug debug15, debug16, debug17, debug18, debug19;
static struct ctldebug *debugvars[CTL_DEBUG_MAXID] = {
        &debug0, &debug1, &debug2, &debug3, &debug4,
        &debug5, &debug6, &debug7, &debug8, &debug9,
        &debug10, &debug11, &debug12, &debug13, &debug14,
        &debug15, &debug16, &debug17, &debug18, &debug19,
};
int
debug_sysctl(int *name, u_int namelen, user_addr_t oldp, size_t *oldlenp, 
             user_addr_t newp, size_t newlen, __unused proc_t p)
{
        struct ctldebug *cdp;

        /* all sysctl names at this level are name and field */
        if (namelen != 2)
                return (ENOTSUP);               /* overloaded */
        if (name[0] < 0 || name[0] >= CTL_DEBUG_MAXID)
                return (ENOTSUP);
        cdp = debugvars[name[0]];
        if (cdp->debugname == 0)
                return (ENOTSUP);
        switch (name[1]) {
        case CTL_DEBUG_NAME:
                return (sysctl_rdstring(oldp, oldlenp, newp, cdp->debugname));
        case CTL_DEBUG_VALUE:
                return (sysctl_int(oldp, oldlenp, newp, newlen, cdp->debugvar));
        default:
                return (ENOTSUP);
        }
        /* NOTREACHED */
}
#endif /* DEBUG */

/*
 * The following sysctl_* functions should not be used
 * any more, as they can only cope with callers in
 * user mode: Use new-style
 *  sysctl_io_number()
 *  sysctl_io_string()
 *  sysctl_io_opaque()
 * instead.
 */

/*
 * Validate parameters and get old / set new parameters
 * for an integer-valued sysctl function.
 */
int
sysctl_int(user_addr_t oldp, size_t *oldlenp, 
           user_addr_t newp, size_t newlen, int *valp)
{
        int error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        if (oldp && *oldlenp < sizeof(int))
                return (ENOMEM);
        if (newp && newlen != sizeof(int))
                return (EINVAL);
        *oldlenp = sizeof(int);
        if (oldp)
                error = copyout(valp, oldp, sizeof(int));
        if (error == 0 && newp) {
                error = copyin(newp, valp, sizeof(int));
                AUDIT_ARG(value32, *valp);
        }
        return (error);
}

/*
 * As above, but read-only.
 */
int
sysctl_rdint(user_addr_t oldp, size_t *oldlenp, user_addr_t newp, int val)
{
        int error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        if (oldp && *oldlenp < sizeof(int))
                return (ENOMEM);
        if (newp)
                return (EPERM);
        *oldlenp = sizeof(int);
        if (oldp)
                error = copyout((caddr_t)&val, oldp, sizeof(int));
        return (error);
}

/*
 * Validate parameters and get old / set new parameters
 * for an quad(64bit)-valued sysctl function.
 */
int
sysctl_quad(user_addr_t oldp, size_t *oldlenp, 
            user_addr_t newp, size_t newlen, quad_t *valp)
{
        int error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        if (oldp && *oldlenp < sizeof(quad_t))
                return (ENOMEM);
        if (newp && newlen != sizeof(quad_t))
                return (EINVAL);
        *oldlenp = sizeof(quad_t);
        if (oldp)
                error = copyout(valp, oldp, sizeof(quad_t));
        if (error == 0 && newp)
                error = copyin(newp, valp, sizeof(quad_t));
        return (error);
}

/*
 * As above, but read-only.
 */
int
sysctl_rdquad(user_addr_t oldp, size_t *oldlenp, user_addr_t newp, quad_t val)
{
        int error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        if (oldp && *oldlenp < sizeof(quad_t))
                return (ENOMEM);
        if (newp)
                return (EPERM);
        *oldlenp = sizeof(quad_t);
        if (oldp)
                error = copyout((caddr_t)&val, oldp, sizeof(quad_t));
        return (error);
}

/*
 * Validate parameters and get old / set new parameters
 * for a string-valued sysctl function.  Unlike sysctl_string, if you
 * give it a too small (but larger than 0 bytes) buffer, instead of
 * returning ENOMEM, it truncates the returned string to the buffer
 * size.  This preserves the semantics of some library routines
 * implemented via sysctl, which truncate their returned data, rather
 * than simply returning an error. The returned string is always NUL
 * terminated.
 */
int
sysctl_trstring(user_addr_t oldp, size_t *oldlenp, 
              user_addr_t newp, size_t newlen, char *str, int maxlen)
{
        int len, copylen, error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        copylen = len = strlen(str) + 1;
        if (oldp && (len < 0 || *oldlenp < 1))
                return (ENOMEM);
        if (oldp && (*oldlenp < (size_t)len))
                copylen = *oldlenp + 1;
        if (newp && (maxlen < 0 || newlen >= (size_t)maxlen))
                return (EINVAL);
        *oldlenp = copylen - 1; /* deal with NULL strings correctly */
        if (oldp) {
                error = copyout(str, oldp, copylen);
                if (!error) {
                        unsigned char c = 0;
                        /* NUL terminate */
                        oldp += *oldlenp;
                        error = copyout((void *)&c, oldp, sizeof(char));
                }
        }
        if (error == 0 && newp) {
                error = copyin(newp, str, newlen);
                str[newlen] = 0;
                AUDIT_ARG(text, (char *)str);
        }
        return (error);
}

/*
 * Validate parameters and get old / set new parameters
 * for a string-valued sysctl function.
 */
int
sysctl_string(user_addr_t oldp, size_t *oldlenp, 
              user_addr_t newp, size_t newlen, char *str, int maxlen)
{
        int len, error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        len = strlen(str) + 1;
        if (oldp && (len < 0 || *oldlenp < (size_t)len))
                return (ENOMEM);
        if (newp && (maxlen < 0 || newlen >= (size_t)maxlen))
                return (EINVAL);
        *oldlenp = len -1; /* deal with NULL strings correctly */
        if (oldp) {
                error = copyout(str, oldp, len);
        }
        if (error == 0 && newp) {
                error = copyin(newp, str, newlen);
                str[newlen] = 0;
                AUDIT_ARG(text, (char *)str);
        }
        return (error);
}

/*
 * As above, but read-only.
 */
int
sysctl_rdstring(user_addr_t oldp, size_t *oldlenp, 
                user_addr_t newp, char *str)
{
        int len, error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        len = strlen(str) + 1;
        if (oldp && *oldlenp < (size_t)len)
                return (ENOMEM);
        if (newp)
                return (EPERM);
        *oldlenp = len;
        if (oldp)
                error = copyout(str, oldp, len);
        return (error);
}

/*
 * Validate parameters and get old / set new parameters
 * for a structure oriented sysctl function.
 */
int
sysctl_struct(user_addr_t oldp, size_t *oldlenp, 
              user_addr_t newp, size_t newlen, void *sp, int len)
{
        int error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        if (oldp && (len < 0 || *oldlenp < (size_t)len))
                return (ENOMEM);
        if (newp && (len < 0 || newlen > (size_t)len))
                return (EINVAL);
        if (oldp) {
                *oldlenp = len;
                error = copyout(sp, oldp, len);
        }
        if (error == 0 && newp)
                error = copyin(newp, sp, len);
        return (error);
}

/*
 * Validate parameters and get old parameters
 * for a structure oriented sysctl function.
 */
int
sysctl_rdstruct(user_addr_t oldp, size_t *oldlenp, 
                user_addr_t newp, void *sp, int len)
{
        int error = 0;

        if (oldp != USER_ADDR_NULL && oldlenp == NULL)
                return (EFAULT);
        if (oldp && (len < 0 || *oldlenp < (size_t)len))
                return (ENOMEM);
        if (newp)
                return (EPERM);
        *oldlenp = len;
        if (oldp)
                error = copyout(sp, oldp, len);
        return (error);
}

/*
 * Get file structures.
 */
static int
sysctl_file
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int error;
        struct fileglob *fg;
        struct extern_file nef;

        if (req->oldptr == USER_ADDR_NULL) {
                /*
                 * overestimate by 10 files
                 */
                req->oldidx = sizeof(filehead) + (nfiles + 10) * sizeof(struct extern_file);
                return (0);
        }

        /*
         * first copyout filehead
         */
        error = SYSCTL_OUT(req, &filehead, sizeof(filehead));
        if (error)
                return (error);

        /*
         * followed by an array of file structures
         */
        for (fg = filehead.lh_first; fg != 0; fg = fg->f_list.le_next) {
        nef.f_list.le_next =  (struct extern_file *)fg->f_list.le_next;
        nef.f_list.le_prev =  (struct extern_file **)fg->f_list.le_prev;
                nef.f_flag = (fg->fg_flag & FMASK);
                nef.f_type = fg->fg_type;
                nef.f_count = fg->fg_count;
                nef.f_msgcount = fg->fg_msgcount;
                nef.f_cred = fg->fg_cred;
                nef.f_ops = fg->fg_ops;
                nef.f_offset = fg->fg_offset;
                nef.f_data = fg->fg_data;
                error = SYSCTL_OUT(req, &nef, sizeof(nef));
                if (error)
                        return (error);
        }
        return (0);
}

SYSCTL_PROC(_kern, KERN_FILE, file,
                CTLTYPE_STRUCT | CTLFLAG_RW,
                0, 0, sysctl_file, "S,filehead", "");

static int
sysdoproc_filt_KERN_PROC_PID(proc_t p, void * arg)
{
        if (p->p_pid != (pid_t)*(int*)arg)
                return(0);
        else
                return(1);
}

static int
sysdoproc_filt_KERN_PROC_PGRP(proc_t p, void * arg)
{
        if (p->p_pgrpid != (pid_t)*(int*)arg)
                return(0);
        else
          return(1);
}

static int
sysdoproc_filt_KERN_PROC_TTY(proc_t p, void * arg)
{
        boolean_t funnel_state;
        int retval;
        struct tty *tp;

        
        funnel_state = thread_funnel_set(kernel_flock, TRUE);
        /* This is very racy but list lock is held.. Hmmm. */
        if ((p->p_flag & P_CONTROLT) == 0 ||
                (p->p_pgrp == NULL) || (p->p_pgrp->pg_session == NULL) ||
                        (tp = SESSION_TP(p->p_pgrp->pg_session)) == TTY_NULL ||
                        tp->t_dev != (dev_t)*(int*)arg)
                                retval = 0;
        else
                retval = 1;

        thread_funnel_set(kernel_flock, funnel_state);

        return(retval);
}

static int
sysdoproc_filt_KERN_PROC_UID(proc_t p, void * arg)
{
        kauth_cred_t my_cred;
        uid_t uid;

        if (p->p_ucred == NULL)
                return(0);
        my_cred = kauth_cred_proc_ref(p);
        uid = kauth_cred_getuid(my_cred);
        kauth_cred_unref(&my_cred);

        if (uid != (uid_t)*(int*)arg)
                return(0);
        else
                return(1);
}


static int
sysdoproc_filt_KERN_PROC_RUID(proc_t p, void * arg)
{
        kauth_cred_t my_cred;
        uid_t ruid;

        if (p->p_ucred == NULL)
                return(0);
        my_cred = kauth_cred_proc_ref(p);
        ruid = my_cred->cr_ruid;
        kauth_cred_unref(&my_cred);

        if (ruid != (uid_t)*(int*)arg)
                return(0);
        else
                return(1);
}

#if CONFIG_LCTX
static int
sysdoproc_filt_KERN_PROC_LCID(proc_t p, void * arg)
{
        if ((p->p_lctx == NULL) ||
                (p->p_lctx->lc_id != (pid_t)*(int*)arg))
                return(0);
        else
                return(1);
}
#endif

/*
 * try over estimating by 5 procs
 */
#define KERN_PROCSLOP   (5 * sizeof (struct kinfo_proc))
struct sysdoproc_args {
        int     buflen;
        caddr_t kprocp;
        boolean_t is_64_bit;
        user_addr_t     dp;
        size_t needed;
        int sizeof_kproc;
        int * errorp;
        int uidcheck;
        int ruidcheck;
        int ttycheck;
        int uidval;
};

int
sysdoproc_callback(proc_t p, void * arg)
{
        struct sysdoproc_args * args = (struct sysdoproc_args *)arg;
        int error=0;

        if (args->buflen >= args->sizeof_kproc) {
                if ((args->ruidcheck != 0)  && (sysdoproc_filt_KERN_PROC_RUID(p, &args->uidval) == 0))
                        return(PROC_RETURNED);
                if ((args->uidcheck != 0)  && (sysdoproc_filt_KERN_PROC_UID(p, &args->uidval) == 0))
                        return(PROC_RETURNED);
                if ((args->ttycheck != 0)  && (sysdoproc_filt_KERN_PROC_TTY(p, &args->uidval) == 0))
                        return(PROC_RETURNED);

                bzero(args->kprocp, args->sizeof_kproc);
                if (args->is_64_bit) {
                        fill_user64_proc(p, (struct user64_kinfo_proc *) args->kprocp);
                }
                else {
                        fill_user32_proc(p, (struct user32_kinfo_proc *) args->kprocp);
                }
                error = copyout(args->kprocp, args->dp, args->sizeof_kproc);
                if (error) {
                        *args->errorp = error;
                        return(PROC_RETURNED_DONE);
                        return (error);
                }
                args->dp += args->sizeof_kproc;
                args->buflen -= args->sizeof_kproc;
        }
        args->needed += args->sizeof_kproc;
        return(PROC_RETURNED);
}

int
sysctl_doproc(int *name, u_int namelen, user_addr_t where, size_t *sizep)
{
        user_addr_t dp = where;
        size_t needed = 0;
        int buflen = where != USER_ADDR_NULL ? *sizep : 0;
        int error = 0;
        boolean_t is_64_bit = FALSE;
        struct user32_kinfo_proc  user32_kproc;
        struct user64_kinfo_proc  user_kproc;
        int sizeof_kproc;
        caddr_t kprocp;
        int (*filterfn)(proc_t, void *) = 0;
        struct sysdoproc_args args;
        int uidcheck = 0;
        int ruidcheck = 0;
        int ttycheck = 0;

        if (namelen != 2 && !(namelen == 1 && name[0] == KERN_PROC_ALL))
                return (EINVAL);
        is_64_bit = proc_is64bit(current_proc()); 
        if (is_64_bit) {
                sizeof_kproc = sizeof(user_kproc);
                kprocp = (caddr_t) &user_kproc;
        }
        else {
                sizeof_kproc = sizeof(user32_kproc);
                kprocp = (caddr_t) &user32_kproc;
        }


        switch (name[0]) {

                case KERN_PROC_PID:
                        filterfn = sysdoproc_filt_KERN_PROC_PID;
                        break;

                case KERN_PROC_PGRP:
                        filterfn = sysdoproc_filt_KERN_PROC_PGRP;
                        break;
        
                case KERN_PROC_TTY:
                        ttycheck = 1;
                        break;

                case KERN_PROC_UID:
                        uidcheck = 1;
                        break;

                case KERN_PROC_RUID:
                        ruidcheck = 1;
                        break;

#if CONFIG_LCTX
                case KERN_PROC_LCID:
                        filterfn = sysdoproc_filt_KERN_PROC_LCID;
                        break;
#endif
        }

        error = 0;
        args.buflen = buflen;
        args.kprocp = kprocp;
        args.is_64_bit = is_64_bit;
        args.dp = dp;
        args.needed = needed;
        args.errorp = &error;
        args.uidcheck = uidcheck;
        args.ruidcheck = ruidcheck;
        args.ttycheck = ttycheck;
        args.sizeof_kproc = sizeof_kproc;
        args.uidval = name[1];

        proc_iterate((PROC_ALLPROCLIST | PROC_ZOMBPROCLIST), sysdoproc_callback, &args, filterfn, &name[1]);

        if (error)
                return(error);

        dp = args.dp;
        needed = args.needed;
        
        if (where != USER_ADDR_NULL) {
                *sizep = dp - where;
                if (needed > *sizep)
                        return (ENOMEM);
        } else {
                needed += KERN_PROCSLOP;
                *sizep = needed;
        }
        return (0);
}

/*
 * Fill in an eproc structure for the specified process.
 */
static void
fill_user32_eproc(proc_t p, struct user32_eproc *ep)
{
        struct tty *tp;
        kauth_cred_t my_cred;
        struct pgrp * pg;
        struct session * sessp;

        pg = proc_pgrp(p);
        sessp = proc_session(p);

        ep->e_paddr = CAST_DOWN_EXPLICIT(uint32_t,p);

        if (pg != PGRP_NULL) {
                ep->e_sess = CAST_DOWN_EXPLICIT(uint32_t,sessp);
                ep->e_pgid = p->p_pgrpid;
                ep->e_jobc = pg->pg_jobc;
                if ((sessp != SESSION_NULL) && sessp->s_ttyvp)
                        ep->e_flag = EPROC_CTTY;
        } else {
                ep->e_sess = 0;
                ep->e_pgid = 0;
                ep->e_jobc = 0;
        }
#if CONFIG_LCTX
        if (p->p_lctx) {
                ep->e_lcid = p->p_lctx->lc_id;
        } else {
                ep->e_lcid = 0;
        }
#endif
        ep->e_ppid = p->p_ppid;
        /* Pre-zero the fake historical pcred */
        bzero(&ep->e_pcred, sizeof(ep->e_pcred));
        if (p->p_ucred) {
                my_cred = kauth_cred_proc_ref(p);

                /* A fake historical pcred */
                ep->e_pcred.p_ruid = my_cred->cr_ruid;
                ep->e_pcred.p_svuid = my_cred->cr_svuid;
                ep->e_pcred.p_rgid = my_cred->cr_rgid;
                ep->e_pcred.p_svgid = my_cred->cr_svgid;
                /* A fake historical *kauth_cred_t */
                ep->e_ucred.cr_ref = my_cred->cr_ref;
                ep->e_ucred.cr_uid = kauth_cred_getuid(my_cred);
                ep->e_ucred.cr_ngroups = my_cred->cr_ngroups;
                bcopy(my_cred->cr_groups, ep->e_ucred.cr_groups, NGROUPS*sizeof(gid_t));

                kauth_cred_unref(&my_cred);
        }
        if (p->p_stat == SIDL || p->p_stat == SZOMB) {
                ep->e_vm.vm_tsize = 0;
                ep->e_vm.vm_dsize = 0;
                ep->e_vm.vm_ssize = 0;
        }
        ep->e_vm.vm_rssize = 0;

        if ((p->p_flag & P_CONTROLT) && (sessp != SESSION_NULL) &&
             (tp = SESSION_TP(sessp))) {
                ep->e_tdev = tp->t_dev;
                ep->e_tpgid = sessp->s_ttypgrpid;
                ep->e_tsess = CAST_DOWN_EXPLICIT(uint32_t,tp->t_session);
        } else
                ep->e_tdev = NODEV;

        if (SESS_LEADER(p, sessp))
                ep->e_flag |= EPROC_SLEADER;
        bzero(&ep->e_wmesg[0], WMESGLEN+1);
        ep->e_xsize = ep->e_xrssize = 0;
        ep->e_xccount = ep->e_xswrss = 0;
        if (sessp != SESSION_NULL)
                session_rele(sessp);
        if(pg != PGRP_NULL)
                pg_rele(pg);
}

/*
 * Fill in an LP64 version of eproc structure for the specified process.
 */
static void
fill_user64_eproc(proc_t p, struct user64_eproc *ep)
{
        struct tty *tp;
        struct  session *sessp = NULL;
        struct pgrp * pg;
        kauth_cred_t my_cred;
        
        pg = proc_pgrp(p);
        sessp = proc_session(p);

        ep->e_paddr = CAST_USER_ADDR_T(p);
        if (pg != PGRP_NULL) {
                ep->e_sess = CAST_USER_ADDR_T(sessp);
                ep->e_pgid = p->p_pgrpid;
                ep->e_jobc = pg->pg_jobc;
                if (sessp != SESSION_NULL) {
                        if (sessp->s_ttyvp)
                            ep->e_flag = EPROC_CTTY;
                }
        } else {
                ep->e_sess = USER_ADDR_NULL;
                ep->e_pgid = 0;
                ep->e_jobc = 0;
        }
#if CONFIG_LCTX
        if (p->p_lctx) {
                ep->e_lcid = p->p_lctx->lc_id;
        } else {
                ep->e_lcid = 0;
        }
#endif
        ep->e_ppid = p->p_ppid;
        /* Pre-zero the fake historical pcred */
        bzero(&ep->e_pcred, sizeof(ep->e_pcred));
        if (p->p_ucred) {
                my_cred = kauth_cred_proc_ref(p);

                /* A fake historical pcred */
                ep->e_pcred.p_ruid = my_cred->cr_ruid;
                ep->e_pcred.p_svuid = my_cred->cr_svuid;
                ep->e_pcred.p_rgid = my_cred->cr_rgid;
                ep->e_pcred.p_svgid = my_cred->cr_svgid;

                /* A fake historical *kauth_cred_t */
                ep->e_ucred.cr_ref = my_cred->cr_ref;
                ep->e_ucred.cr_uid = kauth_cred_getuid(my_cred);
                ep->e_ucred.cr_ngroups = my_cred->cr_ngroups;
                bcopy(my_cred->cr_groups, ep->e_ucred.cr_groups, NGROUPS*sizeof(gid_t));

                kauth_cred_unref(&my_cred);
        }
        if (p->p_stat == SIDL || p->p_stat == SZOMB) {
                ep->e_vm.vm_tsize = 0;
                ep->e_vm.vm_dsize = 0;
                ep->e_vm.vm_ssize = 0;
        }
        ep->e_vm.vm_rssize = 0;

        if ((p->p_flag & P_CONTROLT) && (sessp != SESSION_NULL) &&
             (tp = SESSION_TP(sessp))) {
                ep->e_tdev = tp->t_dev;
                ep->e_tpgid = sessp->s_ttypgrpid;
                ep->e_tsess = CAST_USER_ADDR_T(tp->t_session);
        } else
                ep->e_tdev = NODEV;

        if (SESS_LEADER(p, sessp))
                ep->e_flag |= EPROC_SLEADER;
        bzero(&ep->e_wmesg[0], WMESGLEN+1);
        ep->e_xsize = ep->e_xrssize = 0;
        ep->e_xccount = ep->e_xswrss = 0;
        if (sessp != SESSION_NULL)
                session_rele(sessp);
        if (pg != PGRP_NULL)
                pg_rele(pg);
}

/*
 * Fill in an eproc structure for the specified process.
 */
static void
fill_user32_externproc(proc_t p, struct user32_extern_proc *exp)
{
        exp->p_forw = exp->p_back = 0;
        exp->p_starttime.tv_sec = p->p_start.tv_sec;
        exp->p_starttime.tv_usec = p->p_start.tv_usec;
        exp->p_vmspace = 0;
        exp->p_sigacts = CAST_DOWN_EXPLICIT(uint32_t,p->p_sigacts);
        exp->p_flag  = p->p_flag;
        if (p->p_lflag & P_LTRACED)
                exp->p_flag |= P_TRACED;
        if (p->p_lflag & P_LPPWAIT)
                exp->p_flag |= P_PPWAIT;
        if (p->p_lflag & P_LEXIT)
                exp->p_flag |= P_WEXIT;
        exp->p_stat  = p->p_stat ;
        exp->p_pid  = p->p_pid ;
        exp->p_oppid  = p->p_oppid ;
        /* Mach related  */
        exp->user_stack  = p->user_stack;
        exp->exit_thread  = CAST_DOWN_EXPLICIT(uint32_t,p->exit_thread);
        exp->p_debugger  = p->p_debugger ;
        exp->sigwait  = p->sigwait ;
        /* scheduling */
#ifdef _PROC_HAS_SCHEDINFO_
        exp->p_estcpu  = p->p_estcpu ;
        exp->p_pctcpu  = p->p_pctcpu ;
        exp->p_slptime  = p->p_slptime ;
#else
        exp->p_estcpu  = 0 ;
        exp->p_pctcpu  = 0 ;
        exp->p_slptime = 0 ;
#endif
        exp->p_cpticks  = 0 ;
        exp->p_wchan  = 0 ;
        exp->p_wmesg  = 0 ;
        exp->p_swtime  = 0 ;
        bcopy(&p->p_realtimer, &exp->p_realtimer,sizeof(struct itimerval));
        bcopy(&p->p_rtime, &exp->p_rtime,sizeof(struct timeval));
        exp->p_uticks  = 0 ;
        exp->p_sticks  = 0 ;
        exp->p_iticks  = 0 ;
        exp->p_traceflag  = 0;
        exp->p_tracep  = 0 ;
        exp->p_siglist  = 0 ;   /* No longer relevant */
        exp->p_textvp  = CAST_DOWN_EXPLICIT(uint32_t,p->p_textvp) ;
        exp->p_holdcnt = 0 ;
        exp->p_sigmask  = 0 ;   /* no longer avaialable */
        exp->p_sigignore  = p->p_sigignore ;
        exp->p_sigcatch  = p->p_sigcatch ;
        exp->p_priority  = p->p_priority ;
        exp->p_usrpri  = 0 ;
        exp->p_nice  = p->p_nice ;
        bcopy(&p->p_comm, &exp->p_comm,MAXCOMLEN);
        exp->p_comm[MAXCOMLEN] = '\0';
        exp->p_pgrp  = CAST_DOWN_EXPLICIT(uint32_t,p->p_pgrp) ;
        exp->p_addr  = 0;
        exp->p_xstat  = p->p_xstat ;
        exp->p_acflag  = p->p_acflag ;
        exp->p_ru  = CAST_DOWN_EXPLICIT(uint32_t,p->p_ru) ;             /* XXX may be NULL */
}

/*
 * Fill in an LP64 version of extern_proc structure for the specified process.
 */
static void
fill_user64_externproc(proc_t p, struct user64_extern_proc *exp)
{
        exp->p_forw = exp->p_back = USER_ADDR_NULL;
        exp->p_starttime.tv_sec = p->p_start.tv_sec;
        exp->p_starttime.tv_usec = p->p_start.tv_usec;
        exp->p_vmspace = USER_ADDR_NULL;
        exp->p_sigacts = CAST_USER_ADDR_T(p->p_sigacts);
        exp->p_flag  = p->p_flag;
        if (p->p_lflag & P_LTRACED)
                exp->p_flag |= P_TRACED;
        if (p->p_lflag & P_LPPWAIT)
                exp->p_flag |= P_PPWAIT;
        if (p->p_lflag & P_LEXIT)
                exp->p_flag |= P_WEXIT;
        exp->p_stat  = p->p_stat ;
        exp->p_pid  = p->p_pid ;
        exp->p_oppid  = p->p_oppid ;
        /* Mach related  */
        exp->user_stack  = p->user_stack;
        exp->exit_thread  = CAST_USER_ADDR_T(p->exit_thread);
        exp->p_debugger  = p->p_debugger ;
        exp->sigwait  = p->sigwait ;
        /* scheduling */
#ifdef _PROC_HAS_SCHEDINFO_
        exp->p_estcpu  = p->p_estcpu ;
        exp->p_pctcpu  = p->p_pctcpu ;
        exp->p_slptime  = p->p_slptime ;
#else
        exp->p_estcpu  = 0 ;
        exp->p_pctcpu  = 0 ;
        exp->p_slptime = 0 ;
#endif
        exp->p_cpticks  = 0 ;
        exp->p_wchan  = 0;
        exp->p_wmesg  = 0;
        exp->p_swtime  = 0 ;
        exp->p_realtimer.it_interval.tv_sec = p->p_realtimer.it_interval.tv_sec;
        exp->p_realtimer.it_interval.tv_usec = p->p_realtimer.it_interval.tv_usec;
        exp->p_realtimer.it_value.tv_sec = p->p_realtimer.it_value.tv_sec;
        exp->p_realtimer.it_value.tv_usec = p->p_realtimer.it_value.tv_usec;
        exp->p_rtime.tv_sec = p->p_rtime.tv_sec;
        exp->p_rtime.tv_usec = p->p_rtime.tv_usec;
        exp->p_uticks  = 0 ;
        exp->p_sticks  = 0 ;
        exp->p_iticks  = 0 ;
        exp->p_traceflag  = 0 ;
        exp->p_tracep  = 0;
        exp->p_siglist  = 0 ;   /* No longer relevant */
        exp->p_textvp  = CAST_USER_ADDR_T(p->p_textvp);
        exp->p_holdcnt = 0 ;
        exp->p_sigmask  = 0 ;   /* no longer avaialable */
        exp->p_sigignore  = p->p_sigignore ;
        exp->p_sigcatch  = p->p_sigcatch ;
        exp->p_priority  = p->p_priority ;
        exp->p_usrpri  = 0 ;
        exp->p_nice  = p->p_nice ;
        bcopy(&p->p_comm, &exp->p_comm,MAXCOMLEN);
        exp->p_comm[MAXCOMLEN] = '\0';
        exp->p_pgrp  = CAST_USER_ADDR_T(p->p_pgrp);
        exp->p_addr  = USER_ADDR_NULL;
        exp->p_xstat  = p->p_xstat ;
        exp->p_acflag  = p->p_acflag ;
        exp->p_ru  = CAST_USER_ADDR_T(p->p_ru);         /* XXX may be NULL */
}

static void
fill_user32_proc(proc_t p, struct user32_kinfo_proc *kp)
{
        /* on a 64 bit kernel, 32 bit users will get some truncated information */
        fill_user32_externproc(p, &kp->kp_proc);
        fill_user32_eproc(p, &kp->kp_eproc);
}

static void
fill_user64_proc(proc_t p, struct user64_kinfo_proc *kp)
{
        fill_user64_externproc(p, &kp->kp_proc);
        fill_user64_eproc(p, &kp->kp_eproc);
}

int
kdebug_ops(int *name, u_int namelen, user_addr_t where, 
           size_t *sizep, proc_t p)
{
        int ret=0;

        if (namelen == 0)
                return(ENOTSUP);
        
    ret = suser(kauth_cred_get(), &p->p_acflag);
        if (ret)
                return(ret);
        
        switch(name[0]) {
        case KERN_KDEFLAGS:
        case KERN_KDDFLAGS:
        case KERN_KDENABLE:
        case KERN_KDGETBUF:
        case KERN_KDSETUP:
        case KERN_KDREMOVE:
        case KERN_KDSETREG:
        case KERN_KDGETREG:
        case KERN_KDREADTR:
        case KERN_KDPIDTR:
        case KERN_KDTHRMAP:
        case KERN_KDPIDEX:
        case KERN_KDSETRTCDEC:
        case KERN_KDSETBUF:
        case KERN_KDGETENTROPY:
                ret = kdbg_control(name, namelen, where, sizep);
                break;
        default:
                ret= ENOTSUP;
                break;
        }
        return(ret);
}


/*
 * Return the top *sizep bytes of the user stack, or the entire area of the
 * user stack down through the saved exec_path, whichever is smaller.
 */
int
sysctl_procargs(int *name, u_int namelen, user_addr_t where, 
                size_t *sizep, proc_t cur_proc)
{
        return sysctl_procargsx( name, namelen, where, sizep, cur_proc, 0);
}

static int
sysctl_procargs2(int *name, u_int namelen, user_addr_t where, 
                 size_t *sizep, proc_t cur_proc)
{
        return sysctl_procargsx( name, namelen, where, sizep, cur_proc, 1);
}

static int
sysctl_procargsx(int *name, u_int namelen, user_addr_t where, 
                 size_t *sizep, proc_t cur_proc, int argc_yes)
{
        proc_t p;
        int buflen = where != USER_ADDR_NULL ? *sizep : 0;
        int error = 0;
        struct _vm_map *proc_map;
        struct task * task;
        vm_map_copy_t   tmp;
        user_addr_t     arg_addr;
        size_t          arg_size;
        caddr_t data;
        size_t argslen=0;
        int size;
        vm_offset_t     copy_start, copy_end;
        kern_return_t ret;
        int pid;
        kauth_cred_t my_cred;
        uid_t uid;

        if ( namelen < 1 )
                return(EINVAL);
        
        if (argc_yes)
                buflen -= sizeof(int);          /* reserve first word to return argc */

        /* we only care about buflen when where (oldp from sysctl) is not NULL. */
        /* when where (oldp from sysctl) is NULL and sizep (oldlenp from sysctl */
        /* is not NULL then the caller wants us to return the length needed to */
        /* hold the data we would return */ 
        if (where != USER_ADDR_NULL && (buflen <= 0 || buflen > ARG_MAX)) {
                return(EINVAL);
        }
        arg_size = buflen;

        /*
         *      Lookup process by pid
         */
        pid = name[0];
        p = proc_find(pid);
        if (p == NULL) {
                return(EINVAL);
        }

        /*
         *      Copy the top N bytes of the stack.
         *      On all machines we have so far, the stack grows
         *      downwards.
         *
         *      If the user expects no more than N bytes of
         *      argument list, use that as a guess for the
         *      size.
         */

        if (!p->user_stack) {
                proc_rele(p);
                return(EINVAL);
        }

        if (where == USER_ADDR_NULL) {
                /* caller only wants to know length of proc args data */
                if (sizep == NULL) {
                        proc_rele(p);
                        return(EFAULT);
                }
                        
                 size = p->p_argslen;
                proc_rele(p);
                 if (argc_yes) {
                        size += sizeof(int);
                 }
                 else {
                        /*
                         * old PROCARGS will return the executable's path and plus some
                         * extra space for work alignment and data tags
                         */
                        size += PATH_MAX + (6 * sizeof(int));
                 }
                size += (size & (sizeof(int) - 1)) ? (sizeof(int) - (size & (sizeof(int) - 1))) : 0;
                *sizep = size;
                return (0);
        }
        
        my_cred = kauth_cred_proc_ref(p);
        uid = kauth_cred_getuid(my_cred);
        kauth_cred_unref(&my_cred);

        if ((uid != kauth_cred_getuid(kauth_cred_get())) 
                && suser(kauth_cred_get(), &cur_proc->p_acflag)) {
                proc_rele(p);
                return (EINVAL);
        }

        if ((u_int)arg_size > p->p_argslen)
                arg_size = round_page(p->p_argslen);

        arg_addr = p->user_stack - arg_size;


        /*
         *      Before we can block (any VM code), make another
         *      reference to the map to keep it alive.  We do
         *      that by getting a reference on the task itself.
         */
        task = p->task;
        if (task == NULL) {
                proc_rele(p);
                return(EINVAL);
        }
        
        argslen = p->p_argslen;
        /*
         * Once we have a task reference we can convert that into a
         * map reference, which we will use in the calls below.  The
         * task/process may change its map after we take this reference
         * (see execve), but the worst that will happen then is a return
         * of stale info (which is always a possibility).
         */
        task_reference(task);
        proc_rele(p);
        proc_map = get_task_map_reference(task);
        task_deallocate(task);
        
        if (proc_map == NULL)
                return(EINVAL);


        ret = kmem_alloc(kernel_map, &copy_start, round_page(arg_size));
        if (ret != KERN_SUCCESS) {
                vm_map_deallocate(proc_map);
                return(ENOMEM);
        }

        copy_end = round_page(copy_start + arg_size);

        if( vm_map_copyin(proc_map, (vm_map_address_t)arg_addr, 
                          (vm_map_size_t)arg_size, FALSE, &tmp) != KERN_SUCCESS) {
                        vm_map_deallocate(proc_map);
                        kmem_free(kernel_map, copy_start,
                                        round_page(arg_size));
                        return (EIO);
        }

        /*
         *      Now that we've done the copyin from the process'
         *      map, we can release the reference to it.
         */
        vm_map_deallocate(proc_map);

        if( vm_map_copy_overwrite(kernel_map, 
                                  (vm_map_address_t)copy_start, 
                                  tmp, FALSE) != KERN_SUCCESS) {
                        kmem_free(kernel_map, copy_start,
                                        round_page(arg_size));
                        return (EIO);
        }

        if (arg_size > argslen) {
                data = (caddr_t) (copy_end - argslen);
                size = argslen;
        } else {
                data = (caddr_t) (copy_end - arg_size);
                size = arg_size;
        }

        if (argc_yes) {
                /* Put processes argc as the first word in the copyout buffer */
                suword(where, p->p_argc);
                error = copyout(data, (where + sizeof(int)), size);
                size += sizeof(int);
        } else {
                error = copyout(data, where, size);

                /*
                 * Make the old PROCARGS work to return the executable's path
                 * But, only if there is enough space in the provided buffer
                 *
                 * on entry: data [possibily] points to the beginning of the path 
                 * 
                 * Note: we keep all pointers&sizes aligned to word boundries
                 */
                if ( (! error) && (buflen > 0 && (u_int)buflen > argslen) )
                {
                        int binPath_sz, alignedBinPath_sz = 0;
                        int extraSpaceNeeded, addThis;
                        user_addr_t placeHere;
                        char * str = (char *) data;
                        int max_len = size;

                        /* Some apps are really bad about messing up their stacks
                           So, we have to be extra careful about getting the length
                           of the executing binary.  If we encounter an error, we bail.
                        */

                        /* Limit ourselves to PATH_MAX paths */
                        if ( max_len > PATH_MAX ) max_len = PATH_MAX;

                        binPath_sz = 0;

                        while ( (binPath_sz < max_len-1) && (*str++ != 0) )
                                binPath_sz++;

                        /* If we have a NUL terminator, copy it, too */
                        if (binPath_sz < max_len-1) binPath_sz += 1;

                        /* Pre-Flight the space requiremnts */

                        /* Account for the padding that fills out binPath to the next word */
                        alignedBinPath_sz += (binPath_sz & (sizeof(int)-1)) ? (sizeof(int)-(binPath_sz & (sizeof(int)-1))) : 0;

                        placeHere = where + size;

                        /* Account for the bytes needed to keep placeHere word aligned */ 
                        addThis = (placeHere & (sizeof(int)-1)) ? (sizeof(int)-(placeHere & (sizeof(int)-1))) : 0;

                        /* Add up all the space that is needed */
                        extraSpaceNeeded = alignedBinPath_sz + addThis + binPath_sz + (4 * sizeof(int));

                        /* is there is room to tack on argv[0]? */
                        if ( (buflen & ~(sizeof(int)-1)) >= ( argslen + extraSpaceNeeded ))
                        {
                                placeHere += addThis;
                                suword(placeHere, 0);
                                placeHere += sizeof(int);
                                suword(placeHere, 0xBFFF0000);
                                placeHere += sizeof(int);
                                suword(placeHere, 0);
                                placeHere += sizeof(int);
                                error = copyout(data, placeHere, binPath_sz);
                                if ( ! error )
                                {
                                        placeHere += binPath_sz;
                                        suword(placeHere, 0);
                                        size += extraSpaceNeeded;
                                }
                        }
                }
        }

        if (copy_start != (vm_offset_t) 0) {
                kmem_free(kernel_map, copy_start, copy_end - copy_start);
        }
        if (error) {
                return(error);
        }

        if (where != USER_ADDR_NULL)
                *sizep = size;
        return (0);
}


/*
 * Max number of concurrent aio requests
 */
static int
sysctl_aiomax
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int new_value, changed;
        int error = sysctl_io_number(req, aio_max_requests, sizeof(int), &new_value, &changed);
        if (changed) {
                 /* make sure the system-wide limit is greater than the per process limit */
                if (new_value >= aio_max_requests_per_process)
                        aio_max_requests = new_value;
                else
                        error = EINVAL;
        }
        return(error);
}


/*
 * Max number of concurrent aio requests per process
 */
static int
sysctl_aioprocmax
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int new_value, changed;
        int error = sysctl_io_number(req, aio_max_requests_per_process, sizeof(int), &new_value, &changed);
        if (changed) {
                /* make sure per process limit is less than the system-wide limit */
                if (new_value <= aio_max_requests && new_value >= AIO_LISTIO_MAX)
                        aio_max_requests_per_process = new_value;
                else
                        error = EINVAL;
        }
        return(error);
}


/*
 * Max number of async IO worker threads
 */
static int
sysctl_aiothreads
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int new_value, changed;
        int error = sysctl_io_number(req, aio_worker_threads, sizeof(int), &new_value, &changed);
        if (changed) {
                /* we only allow an increase in the number of worker threads */
                if (new_value > aio_worker_threads ) {
                        _aio_create_worker_threads((new_value - aio_worker_threads));
                        aio_worker_threads = new_value;
                }
                else
                        error = EINVAL;
        }
        return(error);
}


/*
 * System-wide limit on the max number of processes
 */
static int
sysctl_maxproc
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int new_value, changed;
        int error = sysctl_io_number(req, maxproc, sizeof(int), &new_value, &changed);
        if (changed) {
                AUDIT_ARG(value32, new_value);
                /* make sure the system-wide limit is less than the configured hard
                   limit set at kernel compilation */
                if (new_value <= hard_maxproc && new_value > 0)
                        maxproc = new_value;
                else
                        error = EINVAL;
        }
        return(error);
}

SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                ostype, 0, "");
SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                osrelease, 0, "");
SYSCTL_INT(_kern, KERN_OSREV, osrevision, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                (int *)NULL, BSD, "");
SYSCTL_STRING(_kern, KERN_VERSION, version, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                version, 0, "");

#if DEBUG
int debug_kprint_syscall = 0;
char debug_kprint_syscall_process[MAXCOMLEN+1];

SYSCTL_INT (_debug, OID_AUTO, kprint_syscall,
            CTLFLAG_RW, &debug_kprint_syscall, 0, "kprintf syscall tracing");
SYSCTL_STRING(_debug, OID_AUTO, kprint_syscall_process, 
                          CTLFLAG_RW, debug_kprint_syscall_process, sizeof(debug_kprint_syscall_process),
                          "name of process for kprintf syscall tracing");

int debug_kprint_current_process(const char **namep)
{
        struct proc *p = current_proc();

        if (p == NULL) {
                return 0;
        }

        if (debug_kprint_syscall_process[0]) {
                /* user asked to scope tracing to a particular process name */
                if(0 == strncmp(debug_kprint_syscall_process,
                                                p->p_comm, sizeof(debug_kprint_syscall_process))) {
                        /* no value in telling the user that we traced what they asked */
                        if(namep) *namep = NULL;

                        return 1;
                } else {
                        return 0;
                }
        }

        /* trace all processes. Tell user what we traced */
        if (namep) {
                *namep = p->p_comm;
        }

        return 1;
}
#endif

/* PR-5293665: need to use a callback function for kern.osversion to set
 * osversion in IORegistry */

static int
sysctl_osversion(__unused struct sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
{
    int rval = 0;

    rval = sysctl_handle_string(oidp, arg1, arg2, req);

    if (req->newptr) {
        IORegistrySetOSBuildVersion((char *)arg1); 
    }

    return rval;
}

SYSCTL_PROC(_kern, KERN_OSVERSION, osversion,
        CTLFLAG_RW | CTLFLAG_KERN | CTLTYPE_STRING,
        osversion, 256 /* OSVERSIZE*/, 
        sysctl_osversion, "A", "");

static int
sysctl_sysctl_bootargs
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int error;
        char buf[256];

        strlcpy(buf, PE_boot_args(), 256);
        error = sysctl_io_string(req, buf, 256, 0, NULL);
        return(error);
}

SYSCTL_PROC(_kern, OID_AUTO, bootargs,
        CTLFLAG_LOCKED | CTLFLAG_RD | CTLFLAG_KERN | CTLTYPE_STRING,
        NULL, 0,
        sysctl_sysctl_bootargs, "A", "bootargs");

SYSCTL_INT(_kern, KERN_MAXFILES, maxfiles, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                &maxfiles, 0, "");
SYSCTL_INT(_kern, KERN_ARGMAX, argmax, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                (int *)NULL, ARG_MAX, "");
SYSCTL_INT(_kern, KERN_POSIX1, posix1version, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                (int *)NULL, _POSIX_VERSION, "");
SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                (int *)NULL, NGROUPS_MAX, "");
SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                (int *)NULL, 1, "");
#if 1   /* _POSIX_SAVED_IDS from <unistd.h> */
SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                (int *)NULL, 1, "");
#else
SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, 
                CTLFLAG_RD | CTLFLAG_KERN, 
                NULL, 0, "");
#endif
SYSCTL_INT(_kern, OID_AUTO, num_files, 
                CTLFLAG_RD, 
                &nfiles, 0, "");
SYSCTL_COMPAT_INT(_kern, OID_AUTO, num_vnodes, 
                CTLFLAG_RD, 
                &numvnodes, 0, "");
SYSCTL_INT(_kern, OID_AUTO, num_tasks, 
                CTLFLAG_RD, 
                &task_max, 0, "");
SYSCTL_INT(_kern, OID_AUTO, num_threads, 
                CTLFLAG_RD, 
                &thread_max, 0, "");
SYSCTL_INT(_kern, OID_AUTO, num_taskthreads, 
                CTLFLAG_RD, 
                &task_threadmax, 0, "");

static int
sysctl_maxvnodes (__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int oldval = desiredvnodes;
        int error = sysctl_io_number(req, desiredvnodes, sizeof(int), &desiredvnodes, NULL);

        if (oldval != desiredvnodes) {
                reset_vmobjectcache(oldval, desiredvnodes);
                resize_namecache(desiredvnodes);
        }

        return(error);
}

SYSCTL_PROC(_kern, KERN_MAXVNODES, maxvnodes,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_maxvnodes, "I", "");

SYSCTL_PROC(_kern, KERN_MAXPROC, maxproc,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_maxproc, "I", "");

SYSCTL_PROC(_kern, KERN_AIOMAX, aiomax,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_aiomax, "I", "");

SYSCTL_PROC(_kern, KERN_AIOPROCMAX, aioprocmax,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_aioprocmax, "I", "");

SYSCTL_PROC(_kern, KERN_AIOTHREADS, aiothreads,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_aiothreads, "I", "");

static int
sysctl_securelvl
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int new_value, changed;
        int error = sysctl_io_number(req, securelevel, sizeof(int), &new_value, &changed);
        if (changed) {
                if (!(new_value < securelevel && req->p->p_pid != 1)) {
                        proc_list_lock();
                        securelevel = new_value;
                        proc_list_unlock();
                } else {
                        error = EPERM;
                }
        }
        return(error);
}

SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_securelvl, "I", "");


static int
sysctl_domainname
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int error, changed;
        error = sysctl_io_string(req, domainname, sizeof(domainname), 0, &changed);
        if (changed) {
                domainnamelen = strlen(domainname);
        }
        return(error);
}

SYSCTL_PROC(_kern, KERN_DOMAINNAME, nisdomainname,
                CTLTYPE_STRING | CTLFLAG_RW,
                0, 0, sysctl_domainname, "A", "");

SYSCTL_COMPAT_INT(_kern, KERN_HOSTID, hostid, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                &hostid, 0, "");

static int
sysctl_hostname
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        int error, changed;
        error = sysctl_io_string(req, hostname, sizeof(hostname), 1, &changed);
        if (changed) {
                hostnamelen = req->newlen;
        }
        return(error);
}


SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
                CTLTYPE_STRING | CTLFLAG_RW,
                0, 0, sysctl_hostname, "A", "");

static int
sysctl_procname
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        /* Original code allowed writing, I'm copying this, although this all makes
           no sense to me. Besides, this sysctl is never used. */
        return sysctl_io_string(req, &req->p->p_name[0], (2*MAXCOMLEN+1), 1, NULL);
}

SYSCTL_PROC(_kern, KERN_PROCNAME, procname,
                CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_ANYBODY,
                0, 0, sysctl_procname, "A", "");

SYSCTL_INT(_kern, KERN_SPECULATIVE_READS, speculative_reads_disabled, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                &speculative_reads_disabled, 0, "");

SYSCTL_UINT(_kern, OID_AUTO, preheat_pages_max, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                &preheat_pages_max, 0, "");

SYSCTL_UINT(_kern, OID_AUTO, preheat_pages_min, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                &preheat_pages_min, 0, "");

SYSCTL_UINT(_kern, OID_AUTO, preheat_pages_mult, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                &preheat_pages_mult, 0, "");

static int
sysctl_boottime
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        time_t tv_sec = boottime_sec();
        struct proc *p = req->p;

        if (proc_is64bit(p)) {
                struct user64_timeval t;
                t.tv_sec = tv_sec;
                t.tv_usec = 0;
                return sysctl_io_opaque(req, &t, sizeof(t), NULL);
        } else {
                struct user32_timeval t;
                t.tv_sec = tv_sec;
                t.tv_usec = 0;
                return sysctl_io_opaque(req, &t, sizeof(t), NULL);
        }
}

SYSCTL_PROC(_kern, KERN_BOOTTIME, boottime,
                CTLTYPE_STRUCT | CTLFLAG_RD,
                0, 0, sysctl_boottime, "S,timeval", "");

static int
sysctl_symfile
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        char *str;
        int error = get_kernel_symfile(req->p, &str);
        if (error)
                return (error);
        return sysctl_io_string(req, str, 0, 0, NULL);
}


SYSCTL_PROC(_kern, KERN_SYMFILE, symfile,
                CTLTYPE_STRING | CTLFLAG_RD,
                0, 0, sysctl_symfile, "A", "");

#if NFSCLIENT
static int
sysctl_netboot
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        return sysctl_io_number(req, netboot_root(), sizeof(int), NULL, NULL);
}

SYSCTL_PROC(_kern, KERN_NETBOOT, netboot,
                CTLTYPE_INT | CTLFLAG_RD,
                0, 0, sysctl_netboot, "I", "");
#endif

#ifdef CONFIG_IMGSRC_ACCESS
static int
sysctl_imgsrcdev 
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        vfs_context_t ctx = vfs_context_current();
        vnode_t devvp;
        int result;

        if (!vfs_context_issuser(ctx)) {
                return EPERM;
        }    

        if (imgsrc_rootvnode == NULL) {
                return ENOENT;
        }    

        result = vnode_getwithref(imgsrc_rootvnode);
        if (result != 0) {
                return result;
        }
        
        devvp = vnode_mount(imgsrc_rootvnode)->mnt_devvp;
        result = vnode_getwithref(devvp);
        if (result != 0) {
                goto out;
        }

        result = sysctl_io_number(req, vnode_specrdev(devvp), sizeof(dev_t), NULL, NULL);

        vnode_put(devvp);
out:
        vnode_put(imgsrc_rootvnode);
        return result;
}

SYSCTL_PROC(_kern, OID_AUTO, imgsrcdev,
                CTLTYPE_INT | CTLFLAG_RD,
                0, 0, sysctl_imgsrcdev, "I", ""); 
#endif /* CONFIG_IMGSRC_ACCESS */

static int
sysctl_usrstack
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        return sysctl_io_number(req, (int)req->p->user_stack, sizeof(int), NULL, NULL);
}

SYSCTL_PROC(_kern, KERN_USRSTACK32, usrstack,
                CTLTYPE_INT | CTLFLAG_RD,
                0, 0, sysctl_usrstack, "I", "");

static int
sysctl_usrstack64
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        return sysctl_io_number(req, req->p->user_stack, sizeof(req->p->user_stack), NULL, NULL);
}

SYSCTL_PROC(_kern, KERN_USRSTACK64, usrstack64,
                CTLTYPE_QUAD | CTLFLAG_RD,
                0, 0, sysctl_usrstack64, "Q", "");

SYSCTL_STRING(_kern, KERN_COREFILE, corefile, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                corefilename, sizeof(corefilename), "");

static int
sysctl_coredump
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
#ifdef SECURE_KERNEL
        return (ENOTSUP);
#endif
        int new_value, changed;
        int error = sysctl_io_number(req, do_coredump, sizeof(int), &new_value, &changed);
        if (changed) {
                if ((new_value == 0) || (new_value == 1))
                        do_coredump = new_value;
                else
                        error = EINVAL;
        }
        return(error);
}

SYSCTL_PROC(_kern, KERN_COREDUMP, coredump,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_coredump, "I", "");

static int
sysctl_suid_coredump
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
#ifdef SECURE_KERNEL
        return (ENOTSUP);
#endif
        int new_value, changed;
        int error = sysctl_io_number(req, sugid_coredump, sizeof(int), &new_value, &changed);
        if (changed) {
                if ((new_value == 0) || (new_value == 1))
                        sugid_coredump = new_value;
                else
                        error = EINVAL;
        }
        return(error);
}

SYSCTL_PROC(_kern, KERN_SUGID_COREDUMP, sugid_coredump,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_suid_coredump, "I", "");

static int
sysctl_delayterm
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        struct proc *p = req->p;
        int new_value, changed;
        int error = sysctl_io_number(req, (req->p->p_lflag & P_LDELAYTERM)? 1: 0, sizeof(int), &new_value, &changed);
        if (changed) {
                proc_lock(p);
                if (new_value)
                        req->p->p_lflag |=  P_LDELAYTERM;
                else
                        req->p->p_lflag &=  ~P_LDELAYTERM;
                proc_unlock(p);
        }
        return(error);
}

SYSCTL_PROC(_kern, KERN_PROCDELAYTERM, delayterm,
                CTLTYPE_INT | CTLFLAG_RW,
                0, 0, sysctl_delayterm, "I", "");


static int
sysctl_rage_vnode
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        struct proc *p = req->p;
        struct  uthread *ut;
        int new_value, old_value, changed;
        int error;

        ut = get_bsdthread_info(current_thread());

        if (ut->uu_flag & UT_RAGE_VNODES)
                old_value = KERN_RAGE_THREAD;
        else if (p->p_lflag & P_LRAGE_VNODES)
                old_value = KERN_RAGE_PROC;
        else
                old_value = 0;

        error = sysctl_io_number(req, old_value, sizeof(int), &new_value, &changed);

        if (error == 0) {
                switch (new_value) {
                case KERN_RAGE_PROC:
                        proc_lock(p);
                        p->p_lflag |= P_LRAGE_VNODES;
                        proc_unlock(p);
                        break;
                case KERN_UNRAGE_PROC:
                        proc_lock(p);
                        p->p_lflag &= ~P_LRAGE_VNODES;
                        proc_unlock(p);
                        break;

                case KERN_RAGE_THREAD:
                        ut->uu_flag |= UT_RAGE_VNODES;
                        break;
                case KERN_UNRAGE_THREAD:
                        ut = get_bsdthread_info(current_thread());
                        ut->uu_flag &= ~UT_RAGE_VNODES;
                        break;
                }
        }
        return(error);
}

SYSCTL_PROC(_kern, KERN_RAGEVNODE, rage_vnode,
                CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
                0, 0, sysctl_rage_vnode, "I", "");


static int
sysctl_kern_check_openevt
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        struct proc *p = req->p;
        int new_value, old_value, changed;
        int error;

        if (p->p_flag & P_CHECKOPENEVT) {
                old_value = KERN_OPENEVT_PROC;
        } else {
                old_value = 0;
        }

        error = sysctl_io_number(req, old_value, sizeof(int), &new_value, &changed);

        if (error == 0) {
                switch (new_value) {
                case KERN_OPENEVT_PROC:
                        OSBitOrAtomic(P_CHECKOPENEVT, &p->p_flag);
                        break;

                case KERN_UNOPENEVT_PROC:
                        OSBitAndAtomic(~((uint32_t)P_CHECKOPENEVT), &p->p_flag);
                        break;

                default:
                        error = EINVAL;
                }
        }
        return(error);
}

SYSCTL_PROC(_kern, KERN_CHECKOPENEVT, check_openevt, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
            0, 0, sysctl_kern_check_openevt, "I", "set the per-process check-open-evt flag");



static int
sysctl_nx
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
#ifdef SECURE_KERNEL
        return ENOTSUP;
#endif
        int new_value, changed;
        int error;

        error = sysctl_io_number(req, nx_enabled, sizeof(nx_enabled), &new_value, &changed);
        if (error)
                return error;

        if (changed) {
#if defined(__i386__) || defined(__x86_64__)
                /*
                 * Only allow setting if NX is supported on the chip
                 */
                if (!(cpuid_extfeatures() & CPUID_EXTFEATURE_XD))
                        return ENOTSUP;
#endif
                nx_enabled = new_value;
        }
        return(error);
}



SYSCTL_PROC(_kern, KERN_NX_PROTECTION, nx, 
                CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_KERN, 
                0, 0, sysctl_nx, "I", "");

static int
sysctl_loadavg
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
                if (proc_is64bit(req->p)) {
                        struct user64_loadavg loadinfo64;
                        fill_loadavg64(&averunnable, &loadinfo64);
                        return sysctl_io_opaque(req, &loadinfo64, sizeof(loadinfo64), NULL);
                } else {
                        struct user32_loadavg loadinfo32;
                        fill_loadavg32(&averunnable, &loadinfo32);
                        return sysctl_io_opaque(req, &loadinfo32, sizeof(loadinfo32), NULL);
                }
}

SYSCTL_PROC(_vm, VM_LOADAVG, loadavg,
                CTLTYPE_STRUCT | CTLFLAG_RD,
                0, 0, sysctl_loadavg, "S,loadavg", "");

static int
sysctl_swapusage
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
                int                     error;
                uint64_t                swap_total;
                uint64_t                swap_avail;
                vm_size_t               swap_pagesize;
                boolean_t               swap_encrypted;
                struct xsw_usage        xsu;

                error = macx_swapinfo(&swap_total,
                                      &swap_avail,
                                      &swap_pagesize,
                                      &swap_encrypted);
                if (error)
                        return error;

                xsu.xsu_total = swap_total;
                xsu.xsu_avail = swap_avail;
                xsu.xsu_used = swap_total - swap_avail;
                xsu.xsu_pagesize = swap_pagesize;
                xsu.xsu_encrypted = swap_encrypted;
                return sysctl_io_opaque(req, &xsu, sizeof(xsu), NULL);
}



SYSCTL_PROC(_vm, VM_SWAPUSAGE, swapusage,
                CTLTYPE_STRUCT | CTLFLAG_RD,
                0, 0, sysctl_swapusage, "S,xsw_usage", "");


/* this kernel does NOT implement shared_region_make_private_np() */
SYSCTL_INT(_kern, KERN_SHREG_PRIVATIZABLE, shreg_private, 
                CTLFLAG_RD, 
                (int *)NULL, 0, "");

#if defined(__i386__) || defined(__x86_64__)
static int
sysctl_sysctl_exec_affinity(__unused struct sysctl_oid *oidp,
                           __unused void *arg1, __unused int arg2,
                           struct sysctl_req *req)
{
        proc_t cur_proc = req->p;
        int error;
        
        if (req->oldptr != USER_ADDR_NULL) {
                cpu_type_t oldcputype = (cur_proc->p_flag & P_AFFINITY) ? CPU_TYPE_POWERPC : CPU_TYPE_I386;
                if ((error = SYSCTL_OUT(req, &oldcputype, sizeof(oldcputype))))
                        return error;
        }

        if (req->newptr != USER_ADDR_NULL) {
                cpu_type_t newcputype;
                if ((error = SYSCTL_IN(req, &newcputype, sizeof(newcputype))))
                        return error;
                if (newcputype == CPU_TYPE_I386)
                        OSBitAndAtomic(~((uint32_t)P_AFFINITY), &cur_proc->p_flag);
                else if (newcputype == CPU_TYPE_POWERPC)
                        OSBitOrAtomic(P_AFFINITY, &cur_proc->p_flag);
                else
                        return (EINVAL);
        }
        
        return 0;
}
SYSCTL_PROC(_sysctl, OID_AUTO, proc_exec_affinity, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0, sysctl_sysctl_exec_affinity ,"I","proc_exec_affinity");
#endif

static int
fetch_process_cputype(
        proc_t cur_proc,
        int *name,
        u_int namelen,
        cpu_type_t *cputype)
{
        proc_t p = PROC_NULL;
        int refheld = 0;
        cpu_type_t ret = 0;
        int error = 0;
        
        if (namelen == 0)
                p = cur_proc;
        else if (namelen == 1) {
                p = proc_find(name[0]);
                if (p == NULL)
                        return (EINVAL);
                refheld = 1;
        } else {
                error = EINVAL;
                goto out;
        }

#if defined(__i386__) || defined(__x86_64__)
        if (p->p_flag & P_TRANSLATED) {
                ret = CPU_TYPE_POWERPC;
        }
        else
#endif
        {
                ret = cpu_type();
                if (IS_64BIT_PROCESS(p))
                        ret |= CPU_ARCH_ABI64;
        }
        *cputype = ret;
        
        if (refheld != 0)
                proc_rele(p);
out:
        return (error);
}

static int
sysctl_sysctl_native(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
                    struct sysctl_req *req)
{
        int error;
        cpu_type_t proc_cputype = 0;
        if ((error = fetch_process_cputype(req->p, (int *)arg1, arg2, &proc_cputype)) != 0)
                return error;
        int res = 1;
        if ((proc_cputype & ~CPU_ARCH_MASK) != (cpu_type() & ~CPU_ARCH_MASK))
                res = 0;
        return SYSCTL_OUT(req, &res, sizeof(res));
}       
SYSCTL_PROC(_sysctl, OID_AUTO, proc_native, CTLTYPE_NODE|CTLFLAG_RD, 0, 0, sysctl_sysctl_native ,"I","proc_native");

static int
sysctl_sysctl_cputype(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
                     struct sysctl_req *req)
{
        int error;
        cpu_type_t proc_cputype = 0;
        if ((error = fetch_process_cputype(req->p, (int *)arg1, arg2, &proc_cputype)) != 0)
                return error;
        return SYSCTL_OUT(req, &proc_cputype, sizeof(proc_cputype));
}
SYSCTL_PROC(_sysctl, OID_AUTO, proc_cputype, CTLTYPE_NODE|CTLFLAG_RD, 0, 0, sysctl_sysctl_cputype ,"I","proc_cputype");

static int
sysctl_safeboot
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        return sysctl_io_number(req, boothowto & RB_SAFEBOOT ? 1 : 0, sizeof(int), NULL, NULL);
}

SYSCTL_PROC(_kern, KERN_SAFEBOOT, safeboot,
                CTLTYPE_INT | CTLFLAG_RD,
                0, 0, sysctl_safeboot, "I", "");

static int
sysctl_singleuser
(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
{
        return sysctl_io_number(req, boothowto & RB_SINGLE ? 1 : 0, sizeof(int), NULL, NULL);
}

SYSCTL_PROC(_kern, OID_AUTO, singleuser,
                CTLTYPE_INT | CTLFLAG_RD,
                0, 0, sysctl_singleuser, "I", "");

/*
 * Controls for debugging affinity sets - see osfmk/kern/affinity.c
 */
extern boolean_t        affinity_sets_enabled;
extern int              affinity_sets_mapping;

SYSCTL_INT (_kern, OID_AUTO, affinity_sets_enabled,
            CTLFLAG_RW, (int *) &affinity_sets_enabled, 0, "hinting enabled");
SYSCTL_INT (_kern, OID_AUTO, affinity_sets_mapping,
            CTLFLAG_RW, &affinity_sets_mapping, 0, "mapping policy");

/*
 * Limit on total memory users can wire.
 *
 * vm_global_user_wire_limit - system wide limit on wired memory from all processes combined. 
 *
 * vm_user_wire_limit - per address space limit on wired memory.  This puts a cap on the process's rlimit value.
 *
 * These values are initialized to reasonable defaults at boot time based on the available physical memory in
 * kmem_init().
 *
 * All values are in bytes.
 */

vm_map_size_t   vm_global_no_user_wire_amount;
vm_map_size_t   vm_global_user_wire_limit;
vm_map_size_t   vm_user_wire_limit;

/*
 * There needs to be a more automatic/elegant way to do this
 */

SYSCTL_QUAD(_vm, OID_AUTO, global_no_user_wire_amount, CTLFLAG_RW, &vm_global_no_user_wire_amount, "");
SYSCTL_QUAD(_vm, OID_AUTO, global_user_wire_limit, CTLFLAG_RW, &vm_global_user_wire_limit, "");
SYSCTL_QUAD(_vm, OID_AUTO, user_wire_limit, CTLFLAG_RW, &vm_user_wire_limit, "");



/*
 * enable back trace events for thread blocks
 */

extern  uint32_t        kdebug_thread_block;

SYSCTL_INT (_kern, OID_AUTO, kdebug_thread_block,
            CTLFLAG_RW, &kdebug_thread_block, 0, "kdebug thread_block");

/*
 * Kernel stack size and depth
 */
SYSCTL_INT (_kern, OID_AUTO, stack_size,
            CTLFLAG_RD, (int *) &kernel_stack_size, 0, "Kernel stack size");
SYSCTL_INT (_kern, OID_AUTO, stack_depth_max,
            CTLFLAG_RD, (int *) &kernel_stack_depth_max, 0, "Max kernel stack depth at interrupt or context switch");

/*
 * enable back trace for port allocations
 */
extern int ipc_portbt;

SYSCTL_INT(_kern, OID_AUTO, ipc_portbt, 
                CTLFLAG_RW | CTLFLAG_KERN, 
                &ipc_portbt, 0, "");