xnu-344.26.tar.gz

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

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_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
 */

/*
 * sysctl system call.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/unistd.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/disklabel.h>
#include <sys/vm.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <mach/machine.h>
#include <mach/mach_types.h>
#include <mach/vm_param.h>
#include <kern/task.h>
#include <vm/vm_kern.h>
#include <mach/host_info.h>

extern vm_map_t bsd_pageable_map;

#include <sys/mount.h>
#include <sys/kdebug.h>

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

#if __ppc__
#include <ppc/machine_routines.h>
#endif

sysctlfn kern_sysctl;
sysctlfn hw_sysctl;
#ifdef DEBUG
sysctlfn debug_sysctl;
#endif
extern sysctlfn vm_sysctl;
extern sysctlfn vfs_sysctl;
extern sysctlfn net_sysctl;
extern sysctlfn cpu_sysctl;


int
userland_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t 
                *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval);

void
fill_proc(struct proc *p,struct kinfo_proc *kp, int doingzomb);

void
fill_externproc(struct proc *p, struct extern_proc *exp);



/*
 * temporary location for vm_sysctl.  This should be machine independant
 */
int
vm_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
        int *name;
        u_int namelen;
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
        struct proc *p;
{
        extern uint32_t mach_factor[3];
        struct loadavg loadinfo;

        switch (name[0]) {
        case VM_LOADAVG:
                return (sysctl_struct(oldp, oldlenp, newp, newlen,
                                        &averunnable, sizeof(struct loadavg)));
        case VM_MACHFACTOR:
                loadinfo.ldavg[0] = mach_factor[0];
                loadinfo.ldavg[1] = mach_factor[1];
                loadinfo.ldavg[2] = mach_factor[2];
                loadinfo.fscale = LSCALE;
                return (sysctl_struct(oldp, oldlenp, newp, newlen,
                                        &loadinfo, sizeof(struct loadavg)));
        case VM_METER:
                return (EOPNOTSUPP);
        case VM_MAXID:
                return (EOPNOTSUPP);
        default:
                return (EOPNOTSUPP);
        }
        /* NOTREACHED */
        return (EOPNOTSUPP);
}

/*
 * Locking and stats
 */
static struct sysctl_lock {
        int     sl_lock;
        int     sl_want;
        int     sl_locked;
} memlock;

struct __sysctl_args {
        int *name;
        u_int namelen;
        void *old;
        size_t *oldlenp;
        void *new;
        size_t newlen;
};
int
__sysctl(p, uap, retval)
        struct proc *p;
        register struct __sysctl_args *uap;
        register_t *retval;
{
        int error, dolock = 1;
        size_t savelen, oldlen = 0;
        sysctlfn *fn;
        int name[CTL_MAXNAME];
        int i;
        int error1;

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

        /* CTL_UNSPEC is used to get oid to AUTO_OID */
        if (uap->new != NULL
                && ((name[0] == CTL_KERN
                                && !(name[1] == KERN_IPC || name[1] == KERN_PANICINFO))
                        || (name[0] == CTL_HW)
                        || (name[0] == CTL_VM)
                        || (name[0] == CTL_VFS))
                && (error = suser(p->p_ucred, &p->p_acflag)))
                return (error);

        switch (name[0]) {
        case CTL_KERN:
                fn = kern_sysctl;
                if ((name[1] != KERN_VNODE) && (name[1] != KERN_FILE) 
                        && (name[1] != KERN_PROC))
                        dolock = 0;
                break;
        case CTL_HW:
                fn = hw_sysctl;
                break;
        case CTL_VM:
                fn = vm_sysctl;
                break;
                
        case CTL_VFS:
                fn = vfs_sysctl;
                break;
#ifdef DEBUG
        case CTL_DEBUG:
                fn = debug_sysctl;
                break;
#endif
        default:
                fn = 0;
        }

        if (uap->oldlenp &&
            (error = copyin(uap->oldlenp, &oldlen, sizeof(oldlen))))
                return (error);

        if (uap->old != NULL) {
                if (!useracc(uap->old, oldlen, B_WRITE))
                        return (EFAULT);

                /* The pc sampling mechanism does not need to take this lock */
                if ((name[1] != KERN_PCSAMPLES) &&
                    (!((name[1] == KERN_KDEBUG) && (name[2] == KERN_KDGETENTROPY)))) {
                  while (memlock.sl_lock) {
                        memlock.sl_want = 1;
                        sleep((caddr_t)&memlock, PRIBIO+1);
                        memlock.sl_locked++;
                  }
                  memlock.sl_lock = 1;
                }

                if (dolock && oldlen && (error = vslock(uap->old, oldlen))) {
                        if ((name[1] != KERN_PCSAMPLES) &&
                           (! ((name[1] == KERN_KDEBUG) && (name[2] == KERN_KDGETENTROPY)))) {
                                memlock.sl_lock = 0;
                                if (memlock.sl_want) {
                                memlock.sl_want = 0;
                                        wakeup((caddr_t)&memlock);
                                }
                        }
                        return(error);
                }
                savelen = oldlen;
        }

        if (fn)
            error = (*fn)(name + 1, uap->namelen - 1, uap->old,
                          &oldlen, uap->new, uap->newlen, p);
        else
            error = EOPNOTSUPP;

        if ( (name[0] != CTL_VFS) && (error == EOPNOTSUPP))
                error = userland_sysctl(p, name, uap->namelen,
                                        uap->old, uap->oldlenp, 0,
                                        uap->new, uap->newlen, &oldlen);

        if (uap->old != NULL) {
                if (dolock && savelen) {
                        error1 = vsunlock(uap->old, savelen, B_WRITE);
                        if (!error &&  error1)
                                error = error1;
                }
                if (name[1] != KERN_PCSAMPLES) {
                  memlock.sl_lock = 0;
                  if (memlock.sl_want) {
                        memlock.sl_want = 0;
                        wakeup((caddr_t)&memlock);
                  }
                }
        }
        if ((error) && (error != ENOMEM))
                return (error);

        if (uap->oldlenp) {
                i = copyout(&oldlen, uap->oldlenp, sizeof(oldlen));
                if (i) 
                    return i;
        }

        return (error);
}

/*
 * Attributes stored in the kernel.
 */
extern char hostname[MAXHOSTNAMELEN]; /* defined in bsd/kern/init_main.c */
extern int hostnamelen;
extern char domainname[MAXHOSTNAMELEN];
extern int domainnamelen;
extern long hostid;
#ifdef INSECURE
int securelevel = -1;
#else
int securelevel;
#endif

extern int get_kernel_symfile( struct proc *, char **);
extern int sysctl_dopanicinfo(int *, u_int, void *, size_t *,
                        void *, size_t, struct proc *);

/*
 * kernel related system variables.
 */
int
kern_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
        int *name;
        u_int namelen;
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
        struct proc *p;
{
        int error, level, inthostid;
        unsigned int oldval=0;
        char *str;
        extern char ostype[], osrelease[], version[];
        extern int netboot_root();

        /* 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
                        || name[0] == KERN_PROCARGS
                        || name[0] == KERN_PCSAMPLES
                        || name[0] == KERN_IPC
                        || name[0] == KERN_SYSV
                        || name[0] == KERN_PANICINFO)
                )
                return (ENOTDIR);               /* overloaded */

        switch (name[0]) {
        case KERN_OSTYPE:
                return (sysctl_rdstring(oldp, oldlenp, newp, ostype));
        case KERN_OSRELEASE:
                return (sysctl_rdstring(oldp, oldlenp, newp, osrelease));
        case KERN_OSREV:
                return (sysctl_rdint(oldp, oldlenp, newp, BSD));
        case KERN_VERSION:
                return (sysctl_rdstring(oldp, oldlenp, newp, version));
        case KERN_MAXVNODES:
                oldval = desiredvnodes;
                error = sysctl_int(oldp, oldlenp, newp, 
                                newlen, &desiredvnodes);
                reset_vmobjectcache(oldval, desiredvnodes);
                return(error);
        case KERN_MAXPROC:
                return (sysctl_int(oldp, oldlenp, newp, newlen, &maxproc));
        case KERN_MAXFILES:
                return (sysctl_int(oldp, oldlenp, newp, newlen, &maxfiles));
        case KERN_ARGMAX:
                return (sysctl_rdint(oldp, oldlenp, newp, ARG_MAX));
        case KERN_SECURELVL:
                level = securelevel;
                if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &level)) ||
                    newp == NULL)
                        return (error);
                if (level < securelevel && p->p_pid != 1)
                        return (EPERM);
                securelevel = level;
                return (0);
        case KERN_HOSTNAME:
                error = sysctl_string(oldp, oldlenp, newp, newlen,
                    hostname, sizeof(hostname));
                if (newp && !error)
                        hostnamelen = newlen;
                return (error);
        case KERN_DOMAINNAME:
                error = sysctl_string(oldp, oldlenp, newp, newlen,
                    domainname, sizeof(domainname));
                if (newp && !error)
                        domainnamelen = newlen;
                return (error);
        case KERN_HOSTID:
                inthostid = hostid;  /* XXX assumes sizeof long <= sizeof int */
                error =  sysctl_int(oldp, oldlenp, newp, newlen, &inthostid);
                hostid = inthostid;
                return (error);
        case KERN_CLOCKRATE:
                return (sysctl_clockrate(oldp, oldlenp));
        case KERN_BOOTTIME:
                return (sysctl_rdstruct(oldp, oldlenp, newp, &boottime,
                    sizeof(struct timeval)));
        case KERN_VNODE:
                return (sysctl_vnode(oldp, oldlenp));
        case KERN_PROC:
                return (sysctl_doproc(name + 1, namelen - 1, oldp, oldlenp));
        case KERN_FILE:
                return (sysctl_file(oldp, oldlenp));
#ifdef GPROF
        case KERN_PROF:
                return (sysctl_doprof(name + 1, namelen - 1, oldp, oldlenp,
                    newp, newlen));
#endif
        case KERN_POSIX1:
                return (sysctl_rdint(oldp, oldlenp, newp, _POSIX_VERSION));
        case KERN_NGROUPS:
                return (sysctl_rdint(oldp, oldlenp, newp, NGROUPS_MAX));
        case KERN_JOB_CONTROL:
                return (sysctl_rdint(oldp, oldlenp, newp, 1));
        case KERN_SAVED_IDS:
#ifdef _POSIX_SAVED_IDS
                return (sysctl_rdint(oldp, oldlenp, newp, 1));
#else
                return (sysctl_rdint(oldp, oldlenp, newp, 0));
#endif
        case KERN_KDEBUG:
                return (kdebug_ops(name + 1, namelen - 1, oldp, oldlenp, p));
        case KERN_PCSAMPLES:
                return (pcsamples_ops(name + 1, namelen - 1, oldp, oldlenp, p));
        case KERN_PROCARGS:
                /* new one as it does not use kinfo_proc */
                return (sysctl_procargs(name + 1, namelen - 1, oldp, oldlenp, p));
        case KERN_SYMFILE:
                error = get_kernel_symfile( p, &str );
                if ( error )
                        return error;
                return (sysctl_rdstring(oldp, oldlenp, newp, str));
        case KERN_NETBOOT:
                return (sysctl_rdint(oldp, oldlenp, newp, netboot_root()));
        case KERN_PANICINFO:
                return(sysctl_dopanicinfo(name + 1, namelen - 1, oldp, oldlenp,
                        newp, newlen, p));
        default:
                return (EOPNOTSUPP);
        }
        /* NOTREACHED */
}

/*
 * hardware related system variables.
 */
hw_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
        int *name;
        u_int namelen;
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
        struct proc *p;
{
        char dummy[65];
        int  epochTemp;
        extern int vm_page_wire_count;
#if __ppc__
        ml_ppc_cpu_info_t cpu_info;

        ml_ppc_get_info(&cpu_info);
#endif

        /* all sysctl names at this level are terminal */
        if (namelen != 1)
                return (ENOTDIR);               /* overloaded */

        switch (name[0]) {
        case HW_MACHINE:
                if(!PEGetMachineName(dummy,64))
                        return(EINVAL);
                return (sysctl_rdstring(oldp, oldlenp, newp, dummy));
        case HW_MODEL:
                if(!PEGetModelName(dummy,64))
                        return(EINVAL);
                return (sysctl_rdstring(oldp, oldlenp, newp, dummy));
        case HW_NCPU:
                {
                int numcpus=1;
                host_basic_info_data_t hinfo;
                kern_return_t kret;
                int count= HOST_BASIC_INFO_COUNT;
#define BSD_HOST 1

                        kret = host_info(BSD_HOST, HOST_BASIC_INFO, &hinfo, &count);
                        if (kret == KERN_SUCCESS) {
                                numcpus = hinfo.avail_cpus;
                                return (sysctl_rdint(oldp, oldlenp, newp, numcpus));
                        } else {
                                return(EINVAL);
                        }
                }
        case HW_BYTEORDER:
                return (sysctl_rdint(oldp, oldlenp, newp, BYTE_ORDER));
        case HW_PHYSMEM:
                return (sysctl_rdint(oldp, oldlenp, newp, mem_size));
        case HW_USERMEM:
                return (sysctl_rdint(oldp, oldlenp, newp,
                    (mem_size - vm_page_wire_count * page_size)));
        case HW_PAGESIZE:
                return (sysctl_rdint(oldp, oldlenp, newp, page_size));
        case HW_EPOCH:
                epochTemp = PEGetPlatformEpoch();
                if (epochTemp == -1) return(EINVAL);
                return (sysctl_rdint(oldp, oldlenp, newp, epochTemp));
        case HW_BUS_FREQ:
                return (sysctl_rdint(oldp, oldlenp, newp, gPEClockFrequencyInfo.bus_clock_rate_hz));
        case HW_CPU_FREQ:
                return (sysctl_rdint(oldp, oldlenp, newp, gPEClockFrequencyInfo.cpu_clock_rate_hz));
        case HW_TB_FREQ:
                return (sysctl_rdint(oldp, oldlenp, newp, gPEClockFrequencyInfo.timebase_frequency_hz));
#if __ppc__
        case HW_VECTORUNIT:
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.vector_unit));
        case HW_CACHELINE:
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.cache_line_size));
        case HW_L1ICACHESIZE:
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.l1_icache_size));
        case HW_L1DCACHESIZE:
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.l1_dcache_size));
        case HW_L2SETTINGS:
                if (cpu_info.l2_cache_size == 0xFFFFFFFF) return(EINVAL);
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.l2_settings));
        case HW_L2CACHESIZE:
                if (cpu_info.l2_cache_size == 0xFFFFFFFF) return(EINVAL);
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.l2_cache_size));
        case HW_L3SETTINGS:
                if (cpu_info.l3_cache_size == 0xFFFFFFFF) return(EINVAL);
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.l3_settings));
        case HW_L3CACHESIZE:
                if (cpu_info.l3_cache_size == 0xFFFFFFFF) return(EINVAL);
                return (sysctl_rdint(oldp, oldlenp, newp, cpu_info.l3_cache_size));
#endif
        default:
                return (EOPNOTSUPP);
        }
}

#ifdef 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(name, namelen, oldp, oldlenp, newp, newlen, p)
        int *name;
        u_int namelen;
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
        struct proc *p;
{
        struct ctldebug *cdp;

        /* all sysctl names at this level are name and field */
        if (namelen != 2)
                return (ENOTDIR);               /* overloaded */
        cdp = debugvars[name[0]];
        if (cdp->debugname == 0)
                return (EOPNOTSUPP);
        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 (EOPNOTSUPP);
        }
        /* NOTREACHED */
}
#endif /* DEBUG */

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

        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));
        return (error);
}

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

        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(oldp, oldlenp, newp, newlen, valp)
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
        quad_t *valp;
{
        int error = 0;

        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(oldp, oldlenp, newp, val)
        void *oldp;
        size_t *oldlenp;
        void *newp;
        quad_t val;
{
        int error = 0;

        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.
 */
int
sysctl_string(oldp, oldlenp, newp, newlen, str, maxlen)
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
        char *str;
        int maxlen;
{
        int len, error = 0;

        len = strlen(str) + 1;
        if (oldp && *oldlenp < len)
                return (ENOMEM);
        if (newp && newlen >= 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;
        }
        return (error);
}

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

        len = strlen(str) + 1;
        if (oldp && *oldlenp < 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(oldp, oldlenp, newp, newlen, sp, len)
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
        void *sp;
        int len;
{
        int error = 0;

        if (oldp && *oldlenp < len)
                return (ENOMEM);
        if (newp && newlen > 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(oldp, oldlenp, newp, sp, len)
        void *oldp;
        size_t *oldlenp;
        void *newp, *sp;
        int len;
{
        int error = 0;

        if (oldp && *oldlenp < len)
                return (ENOMEM);
        if (newp)
                return (EPERM);
        *oldlenp = len;
        if (oldp)
                error = copyout(sp, oldp, len);
        return (error);
}

/*
 * Get file structures.
 */
int
sysctl_file(where, sizep)
        char *where;
        size_t *sizep;
{
        int buflen, error;
        struct file *fp;
        char *start = where;

        buflen = *sizep;
        if (where == NULL) {
                /*
                 * overestimate by 10 files
                 */
                *sizep = sizeof(filehead) + (nfiles + 10) * sizeof(struct file);
                return (0);
        }

        /*
         * first copyout filehead
         */
        if (buflen < sizeof(filehead)) {
                *sizep = 0;
                return (0);
        }
        if (error = copyout((caddr_t)&filehead, where, sizeof(filehead)))
                return (error);
        buflen -= sizeof(filehead);
        where += sizeof(filehead);

        /*
         * followed by an array of file structures
         */
        for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) {
                if (buflen < sizeof(struct file)) {
                        *sizep = where - start;
                        return (ENOMEM);
                }
                if (error = copyout((caddr_t)fp, where, sizeof (struct file)))
                        return (error);
                buflen -= sizeof(struct file);
                where += sizeof(struct file);
        }
        *sizep = where - start;
        return (0);
}

/*
 * try over estimating by 5 procs
 */
#define KERN_PROCSLOP   (5 * sizeof (struct kinfo_proc))

int
sysctl_doproc(name, namelen, where, sizep)
        int *name;
        u_int namelen;
        char *where;
        size_t *sizep;
{
        register struct proc *p;
        register struct kinfo_proc *dp = (struct kinfo_proc *)where;
        register int needed = 0;
        int buflen = where != NULL ? *sizep : 0;
        int doingzomb;
        struct kinfo_proc kproc;
        int error = 0;

        if (namelen != 2 && !(namelen == 1 && name[0] == KERN_PROC_ALL))
                return (EINVAL);
        p = allproc.lh_first;
        doingzomb = 0;
again:
        for (; p != 0; p = p->p_list.le_next) {
                /*
                 * Skip embryonic processes.
                 */
                if (p->p_stat == SIDL)
                        continue;
                /*
                 * TODO - make more efficient (see notes below).
                 * do by session.
                 */
                switch (name[0]) {

                case KERN_PROC_PID:
                        /* could do this with just a lookup */
                        if (p->p_pid != (pid_t)name[1])
                                continue;
                        break;

                case KERN_PROC_PGRP:
                        /* could do this by traversing pgrp */
                        if (p->p_pgrp->pg_id != (pid_t)name[1])
                                continue;
                        break;

                case KERN_PROC_TTY:
                        if ( doingzomb || (p->p_flag & P_CONTROLT) == 0 ||
                            p->p_session->s_ttyp == NULL ||
                            p->p_session->s_ttyp->t_dev != (dev_t)name[1])
                                continue;
                        break;

                case KERN_PROC_UID:
                        if (doingzomb || (p->p_ucred->cr_uid != (uid_t)name[1]))
                                continue;
                        break;

                case KERN_PROC_RUID:
                        if ( doingzomb || (p->p_cred->p_ruid != (uid_t)name[1]))
                                continue;
                        break;
                }
                if (buflen >= sizeof(struct kinfo_proc)) {
                        bzero(&kproc, sizeof(struct kinfo_proc));
                        fill_proc(p, &kproc, doingzomb);
                        if (error = copyout((caddr_t)&kproc, &dp->kp_proc,
                            sizeof(struct kinfo_proc)))
                                return (error);
                        dp++;
                        buflen -= sizeof(struct kinfo_proc);
                }
                needed += sizeof(struct kinfo_proc);
        }
        if (doingzomb == 0) {
                p = zombproc.lh_first;
                doingzomb++;
                goto again;
        }
        if (where != NULL) {
                *sizep = (caddr_t)dp - where;
                if (needed > *sizep)
                        return (ENOMEM);
        } else {
                needed += KERN_PROCSLOP;
                *sizep = needed;
        }
        return (0);
}

void
fill_proc(p,kp, doingzomb)
        register struct proc *p;
        register struct kinfo_proc *kp;
        int doingzomb;
{
        fill_externproc(p, &kp->kp_proc);
        if (!doingzomb)
                fill_eproc(p, &kp->kp_eproc);
}
/*
 * Fill in an eproc structure for the specified process.
 */
void
fill_eproc(p, ep)
        register struct proc *p;
        register struct eproc *ep;
{
        register struct tty *tp;

        /*
         * Skip zombie processes.
         */
        if (p->p_stat == SZOMB)
                return;

        ep->e_paddr = p;
        ep->e_sess = p->p_pgrp->pg_session;
        ep->e_pcred = *p->p_cred;
        ep->e_ucred = *p->p_ucred;
        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_pptr)
                ep->e_ppid = p->p_pptr->p_pid;
        else
                ep->e_ppid = 0;
        ep->e_pgid = p->p_pgrp->pg_id;
        ep->e_jobc = p->p_pgrp->pg_jobc;
        if ((p->p_flag & P_CONTROLT) &&
             (tp = ep->e_sess->s_ttyp)) {
                ep->e_tdev = tp->t_dev;
                ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
                ep->e_tsess = tp->t_session;
        } else
                ep->e_tdev = NODEV;
        ep->e_flag = ep->e_sess->s_ttyvp ? EPROC_CTTY : 0;
        if (SESS_LEADER(p))
                ep->e_flag |= EPROC_SLEADER;
        if (p->p_wmesg)
                strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN);
        ep->e_xsize = ep->e_xrssize = 0;
        ep->e_xccount = ep->e_xswrss = 0;
}
/*
 * Fill in an eproc structure for the specified process.
 */
void
fill_externproc(p, exp)
        register struct proc *p;
        register struct extern_proc *exp;
{
        exp->p_forw = exp->p_back = NULL;
        if (p->p_stats)
                exp->p_starttime = p->p_stats->p_start;
        exp->p_vmspace = NULL;
        exp->p_sigacts = p->p_sigacts;
        exp->p_flag  = p->p_flag;
        exp->p_stat  = p->p_stat ;
        exp->p_pid  = p->p_pid ;
        exp->p_oppid  = p->p_oppid ;
        exp->p_dupfd  = p->p_dupfd ;
        /* Mach related  */
        exp->user_stack  = p->user_stack ;
        exp->exit_thread  = p->exit_thread ;
        exp->p_debugger  = p->p_debugger ;
        exp->sigwait  = p->sigwait ;
        /* scheduling */
        exp->p_estcpu  = p->p_estcpu ;
        exp->p_cpticks  = p->p_cpticks ;
        exp->p_pctcpu  = p->p_pctcpu ;
        exp->p_wchan  = p->p_wchan ;
        exp->p_wmesg  = p->p_wmesg ;
        exp->p_swtime  = p->p_swtime ;
        exp->p_slptime  = p->p_slptime ;
        bcopy(&p->p_realtimer, &exp->p_realtimer,sizeof(struct itimerval));
        bcopy(&p->p_rtime, &exp->p_rtime,sizeof(struct timeval));
        exp->p_uticks  = p->p_uticks ;
        exp->p_sticks  = p->p_sticks ;
        exp->p_iticks  = p->p_iticks ;
        exp->p_traceflag  = p->p_traceflag ;
        exp->p_tracep  = p->p_tracep ;
        exp->p_siglist  = 0 ;   /* No longer relevant */
        exp->p_textvp  = 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  = p->p_usrpri ;
        exp->p_nice  = p->p_nice ;
        bcopy(&p->p_comm, &exp->p_comm,MAXCOMLEN);
        exp->p_comm[MAXCOMLEN] = '\0';
        exp->p_pgrp  = p->p_pgrp ;
        exp->p_addr  = NULL;
        exp->p_xstat  = p->p_xstat ;
        exp->p_acflag  = p->p_acflag ;
        exp->p_ru  = p->p_ru ;
}

int
kdebug_ops(name, namelen, where, sizep, p)
int *name;
u_int namelen;
char *where;
size_t *sizep;
struct proc *p;
{
        int size=*sizep;
        int ret=0;
        extern int kdbg_control(int *name, u_int namelen,
                char * where,size_t * sizep);

        if (ret = suser(p->p_ucred, &p->p_acflag))
                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= EOPNOTSUPP;
                break;
        }
        return(ret);
}

int
pcsamples_ops(name, namelen, where, sizep, p)
int *name;
u_int namelen;
char *where;
size_t *sizep;
struct proc *p;
{
        int ret=0;
        extern int pcsamples_control(int *name, u_int namelen,
                char * where,size_t * sizep);

        if (ret = suser(p->p_ucred, &p->p_acflag))
                return(ret);

        switch(name[0]) {
        case KERN_PCDISABLE:
        case KERN_PCGETBUF:
        case KERN_PCSETUP:
        case KERN_PCREMOVE:
        case KERN_PCREADBUF:
        case KERN_PCSETREG:
        case KERN_PCSETBUF:
        case KERN_PCCOMM:
                ret = pcsamples_control(name, namelen, where, sizep);
                break;
        default:
                ret= EOPNOTSUPP;
                break;
        }
        return(ret);
}

/*
 *      Returns the top N bytes of the user stack, with
 *      everything below the first argument character
 *      zeroed for security reasons.
 *      Odd data structure is for compatibility.
 */
int
sysctl_procargs(name, namelen, where, sizep, cur_proc)
        int *name;
        u_int namelen;
        char *where;
        size_t *sizep;
        struct proc *cur_proc;
{
        register struct proc *p;
        register int needed = 0;
        int buflen = where != NULL ? *sizep : 0;
        int error = 0;
        struct vm_map *proc_map;
        struct task * task;
        vm_map_copy_t   tmp;
        vm_offset_t     arg_addr;
        vm_size_t       arg_size;
        caddr_t data;
        unsigned size;
        vm_offset_t     copy_start, copy_end;
        vm_offset_t     dealloc_start;  /* area to remove from kernel map */
        vm_offset_t     dealloc_end;
        int             *ip;
        kern_return_t ret;
        int pid;


        if ((buflen <= 0) || (buflen > (PAGE_SIZE << 1))) {
                return(EINVAL);
        }
        arg_size = buflen;

        /*
         *      Lookup process by pid
         */
        pid = name[0];

 restart:
        p = pfind(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)
                return(EINVAL);

        if ((p->p_ucred->cr_uid != cur_proc->p_ucred->cr_uid) 
                && suser(cur_proc->p_ucred, &cur_proc->p_acflag))
                return (EINVAL);
        arg_addr = (vm_offset_t)(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)
                return(EINVAL);
        
        /*
         * A regular task_reference call can block, causing the funnel
         * to be dropped and allowing the proc/task to get freed.
         * Instead, we issue a non-blocking attempt at the task reference,
         * and look up the proc/task all over again if that fails.
         */
        if (!task_reference_try(task)) {
                mutex_pause();
                goto restart;
        }

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

        proc_map = get_task_map(task);
        copy_end = round_page(copy_start + arg_size);

        if( vm_map_copyin(proc_map, trunc_page(arg_addr), round_page(arg_size), 
                        FALSE, &tmp) != KERN_SUCCESS) {
                        task_deallocate(task);
                        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.
         */
        task_deallocate(task);

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

        data = (caddr_t) (copy_end - arg_size);
        ip = (int *) copy_end;          
        size = arg_size;

        /*
         *      Now look down the stack for the bottom of the
         *      argument list.  Since this call is otherwise
         *      unprotected, we can't let the nosy user see
         *      anything else on the stack.
         *
         *      The arguments are pushed on the stack by
         *      execve() as:
         *
         *              .long   0
         *              arg 0   (null-terminated)
         *              arg 1
         *              ...
         *              arg N
         *              .long   0
         *
         */

        ip -= 2; /*skip trailing 0 word and assume at least one
                  argument.  The last word of argN may be just
                  the trailing 0, in which case we'd stop
                  there */
        while (*--ip)
                if (ip == (int *)data)
                        break;
        /* 
         *  To account for saved path name and not having a null after that
         *  Run the sweep again. If we have already sweeped entire range skip this
         */
         if (ip != (int *)data) {
                while (*--ip)
                    if (ip == (int *)data)
                            break;
        }
        
        bzero(data, (unsigned) ((int)ip - (int)data));

        dealloc_start = copy_start;
        dealloc_end = copy_end;


        size = MIN(size, buflen);
        error = copyout(data, where, size);

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

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