FreeBSD/Linux Kernel Cross Reference
sys/bsd/sys/sysctl.h

     /*
      * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * 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. 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_LICENSE_HEADER_END@
     */
    /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
    /*
     * Copyright (c) 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.
     *
     *      @(#)sysctl.h    8.1 (Berkeley) 6/2/93
     */
    
    #ifndef _SYS_SYSCTL_H_
    #define _SYS_SYSCTL_H_
    
    /*
     * These are for the eproc structure defined below.
     */
    #include <sys/appleapiopts.h>
    #ifndef KERNEL
    #include <sys/time.h>
    #include <sys/ucred.h>
    #endif
    
    #include <sys/vm.h>
    #include <sys/proc.h>
    #include <sys/linker_set.h>
    
    /*
     * Definitions for sysctl call.  The sysctl call uses a hierarchical name
     * for objects that can be examined or modified.  The name is expressed as
     * a sequence of integers.  Like a file path name, the meaning of each
     * component depends on its place in the hierarchy.  The top-level and kern
     * identifiers are defined here, and other identifiers are defined in the
     * respective subsystem header files.
     */
    
    #define CTL_MAXNAME     12      /* largest number of components supported */
    
    /*
     * Each subsystem defined by sysctl defines a list of variables
     * for that subsystem. Each name is either a node with further 
     * levels defined below it, or it is a leaf of some particular
     * type given below. Each sysctl level defines a set of name/type
     * pairs to be used by sysctl(1) in manipulating the subsystem.
     */
    struct ctlname {
            char    *ctl_name;      /* subsystem name */
           int     ctl_type;       /* type of name */
   };
   
   #define CTLTYPE         0xf     /* Mask for the type */
   #define CTLTYPE_NODE    1       /* name is a node */
   #define CTLTYPE_INT     2       /* name describes an integer */
   #define CTLTYPE_STRING  3       /* name describes a string */
   #define CTLTYPE_QUAD    4       /* name describes a 64-bit number */
   #define CTLTYPE_OPAQUE  5       /* name describes a structure */
   #define CTLTYPE_STRUCT  CTLTYPE_OPAQUE  /* name describes a structure */
   
   #define CTLFLAG_RD      0x80000000      /* Allow reads of variable */
   #define CTLFLAG_WR      0x40000000      /* Allow writes to the variable */
   #define CTLFLAG_RW      (CTLFLAG_RD|CTLFLAG_WR)
   #define CTLFLAG_NOLOCK  0x20000000      /* XXX Don't Lock */
   #define CTLFLAG_ANYBODY 0x10000000      /* All users can set this var */
   #define CTLFLAG_SECURE  0x08000000      /* Permit set only if securelevel<=0 */
   #define CTLFLAG_MASKED  0x04000000      /* deprecated variable, do not display */
   #define CTLFLAG_NOAUTO  0x02000000      /* do not auto-register */
   #define CTLFLAG_KERN    0x01000000      /* valid inside the kernel */
   
   /*
    * USE THIS instead of a hardwired number from the categories below
    * to get dynamically assigned sysctl entries using the linker-set
    * technology. This is the way nearly all new sysctl variables should
    * be implemented.
    * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
    */ 
   #define OID_AUTO        (-1)
   
   #ifdef KERNEL
   #ifdef __APPLE_API_UNSTABLE
   #define SYSCTL_HANDLER_ARGS (struct sysctl_oid *oidp, void *arg1, int arg2, \
           struct sysctl_req *req)
   
   /*
    * This describes the access space for a sysctl request.  This is needed
    * so that we can use the interface from the kernel or from user-space.
    */
   struct sysctl_req {
           struct proc     *p;
           int             lock;
           void            *oldptr;
           size_t          oldlen;
           size_t          oldidx;
           int             (*oldfunc)(struct sysctl_req *, const void *, size_t);
           void            *newptr;
           size_t          newlen;
           size_t          newidx;
           int             (*newfunc)(struct sysctl_req *, void *, size_t);
   };
   
   SLIST_HEAD(sysctl_oid_list, sysctl_oid);
   
   /*
    * This describes one "oid" in the MIB tree.  Potentially more nodes can
    * be hidden behind it, expanded by the handler.
    */
   struct sysctl_oid {
           struct sysctl_oid_list *oid_parent;
           SLIST_ENTRY(sysctl_oid) oid_link;
           int             oid_number;
           int             oid_kind;
           void            *oid_arg1;
           int             oid_arg2;
           const char      *oid_name;
           int             (*oid_handler) SYSCTL_HANDLER_ARGS;
           const char      *oid_fmt;
   };
   
   #define SYSCTL_IN(r, p, l) (r->newfunc)(r, p, l)
   #define SYSCTL_OUT(r, p, l) (r->oldfunc)(r, p, l)
   
   int sysctl_handle_int SYSCTL_HANDLER_ARGS;
   int sysctl_handle_long SYSCTL_HANDLER_ARGS;
   int sysctl_handle_quad SYSCTL_HANDLER_ARGS;
   int sysctl_handle_int2quad SYSCTL_HANDLER_ARGS;
   /*int sysctl_handle_intptr SYSCTL_HANDLER_ARGS; XXX not implemented */
   int sysctl_handle_string SYSCTL_HANDLER_ARGS;
   int sysctl_handle_opaque SYSCTL_HANDLER_ARGS;
   
   /*
    * These functions are used to add/remove an oid from the mib.
    */
   void sysctl_register_oid(struct sysctl_oid *oidp);
   void sysctl_unregister_oid(struct sysctl_oid *oidp);
   
   /* Declare an oid to allow child oids to be added to it. */
   #define SYSCTL_DECL(name)                                       \
           extern struct sysctl_oid_list sysctl_##name##_children
   
   /* This constructs a "raw" MIB oid. */
   #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
           struct sysctl_oid sysctl_##parent##_##name = {           \
                   &sysctl_##parent##_children, { 0 },                      \
                   nbr, kind, a1, a2, #name, handler, fmt };
   
   
   /* This constructs a node from which other oids can hang. */
   #define SYSCTL_NODE(parent, nbr, name, access, handler, descr)              \
           struct sysctl_oid_list sysctl_##parent##_##name##_children;         \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|access,                  \
                      (void*)&sysctl_##parent##_##name##_children, 0, handler, \
                      "N", descr);
   
   /* Oid for a string.  len can be 0 to indicate '\0' termination. */
   #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|access, \
                   arg, len, sysctl_handle_string, "A", descr)
   
   /* Oid for an int.  If ptr is NULL, val is returned. */
   #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|access, \
                   ptr, val, sysctl_handle_int, "I", descr)
   
   /* Oid for an unsigned int.  If ptr is NULL, val is returned. */
   #define SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|access, \
                   ptr, val, sysctl_handle_int, "IU", descr)
   
   /* Oid for a long.  The pointer must be non NULL. */
   #define SYSCTL_LONG(parent, nbr, name, access, ptr, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|access, \
                   ptr, 0, sysctl_handle_long, "L", descr)
   
   /* Oid for a quad.  The pointer must be non NULL. */
   #define SYSCTL_QUAD(parent, nbr, name, access, ptr, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_QUAD|access, \
                   ptr, 0, sysctl_handle_quad, "Q", descr)
   
   /* Oid for a int returned as quad.  The pointer must be non NULL. */
   #define SYSCTL_INT2QUAD(parent, nbr, name, access, ptr, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_QUAD|access, \
                   ptr, 0, sysctl_handle_int2quad, "Q", descr)
   
   /* Oid for an opaque object.  Specified by a pointer and a length. */
   #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|access, \
                   ptr, len, sysctl_handle_opaque, fmt, descr)
   
   /* Oid for a struct.  Specified by a pointer and a type. */
   #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|access, \
                   ptr, sizeof(struct type), sysctl_handle_opaque, \
                   "S," #type, descr)
   
   /* Oid for a procedure.  Specified by a pointer and an arg. */
   #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
           SYSCTL_OID(parent, nbr, name, access, \
                   ptr, arg, handler, fmt, descr)
   #endif /* __APPLE_API_UNSTABLE */
   #endif /* KERNEL */
   
   /*
    * Top-level identifiers
    */
   #define CTL_UNSPEC      0               /* unused */
   #define CTL_KERN        1               /* "high kernel": proc, limits */
   #define CTL_VM          2               /* virtual memory */
   #define CTL_VFS         3               /* file system, mount type is next */
   #define CTL_NET         4               /* network, see socket.h */
   #define CTL_DEBUG       5               /* debugging parameters */
   #define CTL_HW          6               /* generic cpu/io */
   #define CTL_MACHDEP     7               /* machine dependent */
   #define CTL_USER        8               /* user-level */
   #define CTL_MAXID       9               /* number of valid top-level ids */
   
   #define CTL_NAMES { \
           { 0, 0 }, \
           { "kern", CTLTYPE_NODE }, \
           { "vm", CTLTYPE_NODE }, \
           { "vfs", CTLTYPE_NODE }, \
           { "net", CTLTYPE_NODE }, \
           { "debug", CTLTYPE_NODE }, \
           { "hw", CTLTYPE_NODE }, \
           { "machdep", CTLTYPE_NODE }, \
           { "user", CTLTYPE_NODE }, \
   }
   
   /*
    * CTL_KERN identifiers
    */
   #define KERN_OSTYPE              1      /* string: system version */
   #define KERN_OSRELEASE           2      /* string: system release */
   #define KERN_OSREV               3      /* int: system revision */
   #define KERN_VERSION             4      /* string: compile time info */
   #define KERN_MAXVNODES           5      /* int: max vnodes */
   #define KERN_MAXPROC             6      /* int: max processes */
   #define KERN_MAXFILES            7      /* int: max open files */
   #define KERN_ARGMAX              8      /* int: max arguments to exec */
   #define KERN_SECURELVL           9      /* int: system security level */
   #define KERN_HOSTNAME           10      /* string: hostname */
   #define KERN_HOSTID             11      /* int: host identifier */
   #define KERN_CLOCKRATE          12      /* struct: struct clockrate */
   #define KERN_VNODE              13      /* struct: vnode structures */
   #define KERN_PROC               14      /* struct: process entries */
   #define KERN_FILE               15      /* struct: file entries */
   #define KERN_PROF               16      /* node: kernel profiling info */
   #define KERN_POSIX1             17      /* int: POSIX.1 version */
   #define KERN_NGROUPS            18      /* int: # of supplemental group ids */
   #define KERN_JOB_CONTROL        19      /* int: is job control available */
   #define KERN_SAVED_IDS          20      /* int: saved set-user/group-ID */
   #define KERN_BOOTTIME           21      /* struct: time kernel was booted */
   #define KERN_NISDOMAINNAME      22      /* string: YP domain name */
   #define KERN_DOMAINNAME         KERN_NISDOMAINNAME
   #define KERN_MAXPARTITIONS      23      /* int: number of partitions/disk */
   #define KERN_KDEBUG                     24      /* int: kernel trace points */
   #define KERN_UPDATEINTERVAL     25      /* int: update process sleep time */
   #define KERN_OSRELDATE          26      /* int: OS release date */
   #define KERN_NTP_PLL            27      /* node: NTP PLL control */
   #define KERN_BOOTFILE           28      /* string: name of booted kernel */
   #define KERN_MAXFILESPERPROC    29      /* int: max open files per proc */
   #define KERN_MAXPROCPERUID      30      /* int: max processes per uid */
   #define KERN_DUMPDEV            31      /* dev_t: device to dump on */
   #define KERN_IPC                        32      /* node: anything related to IPC */
   #define KERN_DUMMY                      33      /* unused */
   #define KERN_PS_STRINGS         34      /* int: address of PS_STRINGS */
   #define KERN_USRSTACK           35      /* int: address of USRSTACK */
   #define KERN_LOGSIGEXIT         36      /* int: do we log sigexit procs? */
   #define KERN_SYMFILE            37      /* string: kernel symbol filename */
   #define KERN_PROCARGS           38
   #define KERN_PCSAMPLES          39      /* node: pc sampling */
   #define KERN_NETBOOT            40      /* int: are we netbooted? 1=yes,0=no */
   #define KERN_PANICINFO          41      /* node: panic UI information */
   #define KERN_SYSV                       42      /* node: panic UI information */
   #define KERN_AFFINITY           43      /* xxx */
   #define KERN_CLASSIC            44      /* xxx */
   #define KERN_CLASSICHANDLER     45      /* xxx */
   #define KERN_AIOMAX                     46      /* int: max aio requests */
   #define KERN_AIOPROCMAX         47      /* int: max aio requests per process */
   #define KERN_AIOTHREADS         48      /* int: max aio worker threads */
   #ifdef __APPLE_API_UNSTABLE
   #define KERN_PROCARGS2                  49      /* number of valid kern ids */
   #endif /* __APPLE_API_UNSTABLE */
   #define KERN_MAXID                      50      /* number of valid kern ids */
   
   
   /* KERN_KDEBUG types */
   #define KERN_KDEFLAGS           1
   #define KERN_KDDFLAGS           2
   #define KERN_KDENABLE           3
   #define KERN_KDSETBUF           4
   #define KERN_KDGETBUF           5
   #define KERN_KDSETUP            6
   #define KERN_KDREMOVE           7
   #define KERN_KDSETREG           8
   #define KERN_KDGETREG           9
   #define KERN_KDREADTR           10
   #define KERN_KDPIDTR        11
   #define KERN_KDTHRMAP           12
   /* Don't use 13 as it is overloaded with KERN_VNODE */
   #define KERN_KDPIDEX            14
   #define KERN_KDSETRTCDEC        15
   #define KERN_KDGETENTROPY       16
   
   /* KERN_PCSAMPLES types */
   #define KERN_PCDISABLE          1
   #define KERN_PCSETBUF           2
   #define KERN_PCGETBUF           3
   #define KERN_PCSETUP            4
   #define KERN_PCREMOVE           5
   #define KERN_PCREADBUF          6
   #define KERN_PCSETREG           7
   #define KERN_PCCOMM             8
   
   /* KERN_PANICINFO types */
   #define KERN_PANICINFO_MAXSIZE  1       /* quad: panic UI image size limit */
   #define KERN_PANICINFO_IMAGE16  2       /* string: path to the panic UI (16 bit) */
   #define KERN_PANICINFO_IMAGE32  3       /* string: path to the panic UI (32 bit) */
   
   /*
    * KERN_SYSV identifiers
    */
   #define KSYSV_SHMMAX            1       /* int: max shared memory segment size (bytes) */
   #define KSYSV_SHMMIN            2       /* int: min shared memory segment size (bytes) */
   #define KSYSV_SHMMNI            3       /* int: max number of shared memory identifiers */
   #define KSYSV_SHMSEG            4       /* int: max shared memory segments per process */
   #define KSYSV_SHMALL            5       /* int: max amount of shared memory (pages) */
   #define KSYSV_SEMMNI            6       /* int: max num of semaphore identifiers  */
   #define KSYSV_SEMMNS            7       /* int: max num of semaphores in system */
   #define KSYSV_SEMMNU            8       /* int: max num of undo structures in system  */
   #define KSYSV_SEMMSL            9       /* int: max num of semaphores per id  */
   #define KSYSV_SEMUNE            10      /* int: max num of undo entries per process */
   
   
   #define CTL_KERN_NAMES { \
           { 0, 0 }, \
           { "ostype", CTLTYPE_STRING }, \
           { "osrelease", CTLTYPE_STRING }, \
           { "osrevision", CTLTYPE_INT }, \
           { "version", CTLTYPE_STRING }, \
           { "maxvnodes", CTLTYPE_INT }, \
           { "maxproc", CTLTYPE_INT }, \
           { "maxfiles", CTLTYPE_INT }, \
           { "argmax", CTLTYPE_INT }, \
           { "securelevel", CTLTYPE_INT }, \
           { "hostname", CTLTYPE_STRING }, \
           { "hostid", CTLTYPE_INT }, \
           { "clockrate", CTLTYPE_STRUCT }, \
           { "vnode", CTLTYPE_STRUCT }, \
           { "proc", CTLTYPE_STRUCT }, \
           { "file", CTLTYPE_STRUCT }, \
           { "profiling", CTLTYPE_NODE }, \
           { "posix1version", CTLTYPE_INT }, \
           { "ngroups", CTLTYPE_INT }, \
           { "job_control", CTLTYPE_INT }, \
           { "saved_ids", CTLTYPE_INT }, \
           { "boottime", CTLTYPE_STRUCT }, \
           { "nisdomainname", CTLTYPE_STRING }, \
           { "maxpartitions", CTLTYPE_INT }, \
           { "kdebug", CTLTYPE_INT }, \
           { "update", CTLTYPE_INT }, \
           { "osreldate", CTLTYPE_INT }, \
           { "ntp_pll", CTLTYPE_NODE }, \
           { "bootfile", CTLTYPE_STRING }, \
           { "maxfilesperproc", CTLTYPE_INT }, \
           { "maxprocperuid", CTLTYPE_INT }, \
           { "dumpdev", CTLTYPE_STRUCT }, /* we lie; don't print as int */ \
           { "ipc", CTLTYPE_NODE }, \
           { "dummy", CTLTYPE_INT }, \
           { "ps_strings", CTLTYPE_INT }, \
           { "usrstack", CTLTYPE_INT }, \
           { "logsigexit", CTLTYPE_INT }, \
           { "symfile",CTLTYPE_STRING },\
           { "procargs",CTLTYPE_STRUCT },\
           { "pcsamples",CTLTYPE_STRUCT },\
           { "netboot", CTLTYPE_INT }, \
           { "panicinfo", CTLTYPE_NODE }, \
           { "sysv", CTLTYPE_NODE }, \
           { "dummy", CTLTYPE_INT }, \
           { "dummy", CTLTYPE_INT }, \
           { "dummy", CTLTYPE_INT }, \
           { "aiomax", CTLTYPE_INT }, \
           { "aioprocmax", CTLTYPE_INT }, \
           { "aiothreads", CTLTYPE_INT }, \
           { "procargs2",CTLTYPE_STRUCT } \
   }
   
   /*
    * CTL_VFS identifiers
    */
   #define CTL_VFS_NAMES { \
           { "vfsconf", CTLTYPE_STRUCT } \
   }
   
   /* 
    * KERN_PROC subtypes
    */
   #define KERN_PROC_ALL           0       /* everything */
   #define KERN_PROC_PID           1       /* by process id */
   #define KERN_PROC_PGRP          2       /* by process group id */
   #define KERN_PROC_SESSION       3       /* by session of pid */
   #define KERN_PROC_TTY           4       /* by controlling tty */
   #define KERN_PROC_UID           5       /* by effective uid */
   #define KERN_PROC_RUID          6       /* by real uid */
   
   /* 
    * KERN_PROC subtype ops return arrays of augmented proc structures:
    */
   #ifdef __APPLE_API_UNSTABLE
   struct kinfo_proc {
           struct  extern_proc kp_proc;                    /* proc structure */
           struct  eproc {
                   struct  proc *e_paddr;          /* address of proc */
                   struct  session *e_sess;        /* session pointer */
                   struct  pcred e_pcred;          /* process credentials */
                   struct  ucred e_ucred;          /* current credentials */
                   struct   vmspace e_vm;          /* address space */
                   pid_t   e_ppid;                 /* parent process id */
                   pid_t   e_pgid;                 /* process group id */
                   short   e_jobc;                 /* job control counter */
                   dev_t   e_tdev;                 /* controlling tty dev */
                   pid_t   e_tpgid;                /* tty process group id */
                   struct  session *e_tsess;       /* tty session pointer */
   #define WMESGLEN        7
                   char    e_wmesg[WMESGLEN+1];    /* wchan message */
                   segsz_t e_xsize;                /* text size */
                   short   e_xrssize;              /* text rss */
                   short   e_xccount;              /* text references */
                   short   e_xswrss;
                   long    e_flag;
   #define EPROC_CTTY      0x01    /* controlling tty vnode active */
   #define EPROC_SLEADER   0x02    /* session leader */
   #define COMAPT_MAXLOGNAME       12
                   char    e_login[COMAPT_MAXLOGNAME];     /* short setlogin() name */
                   long    e_spare[4];
           } kp_eproc;
   };
   #endif /* __APPLE_API_UNSTABLE */
   
   /*
    * KERN_IPC identifiers
    */
   #define KIPC_MAXSOCKBUF         1       /* int: max size of a socket buffer */
   #define KIPC_SOCKBUF_WASTE      2       /* int: wastage factor in sockbuf */
   #define KIPC_SOMAXCONN          3       /* int: max length of connection q */
   #define KIPC_MAX_LINKHDR        4       /* int: max length of link header */
   #define KIPC_MAX_PROTOHDR       5       /* int: max length of network header */
   #define KIPC_MAX_HDR            6       /* int: max total length of headers */
   #define KIPC_MAX_DATALEN        7       /* int: max length of data? */
   #define KIPC_MBSTAT             8       /* struct: mbuf usage statistics */
   #define KIPC_NMBCLUSTERS        9       /* int: maximum mbuf clusters */
   
   /*
    * CTL_VM identifiers
    */
   #define VM_METER        1               /* struct vmmeter */
   #define VM_LOADAVG      2               /* struct loadavg */
   #define VM_MAXID        3               /* number of valid vm ids */
   #define VM_MACHFACTOR   4               /* struct loadavg with mach factor*/
   
   #define CTL_VM_NAMES { \
           { 0, 0 }, \
           { "vmmeter", CTLTYPE_STRUCT }, \
           { "loadavg", CTLTYPE_STRUCT } \
   }
   
   /*
    * CTL_HW identifiers
    */
   #define HW_MACHINE       1              /* string: machine class */
   #define HW_MODEL         2              /* string: specific machine model */
   #define HW_NCPU          3              /* int: number of cpus */
   #define HW_BYTEORDER     4              /* int: machine byte order */
   #define HW_PHYSMEM       5              /* int: total memory */
   #define HW_USERMEM       6              /* int: non-kernel memory */
   #define HW_PAGESIZE      7              /* int: software page size */
   #define HW_DISKNAMES     8              /* strings: disk drive names */
   #define HW_DISKSTATS     9              /* struct: diskstats[] */
   #define HW_EPOCH        10              /* int: 0 for Legacy, else NewWorld */
   #define HW_FLOATINGPT   11              /* int: has HW floating point? */
   #define HW_MACHINE_ARCH 12              /* string: machine architecture */
   #define HW_VECTORUNIT   13              /* int: has HW vector unit? */
   #define HW_BUS_FREQ     14              /* int: Bus Frequency */
   #define HW_CPU_FREQ     15              /* int: CPU Frequency */
   #define HW_CACHELINE    16              /* int: Cache Line Size in Bytes */
   #define HW_L1ICACHESIZE 17              /* int: L1 I Cache Size in Bytes */
   #define HW_L1DCACHESIZE 18              /* int: L1 D Cache Size in Bytes */
   #define HW_L2SETTINGS   19              /* int: L2 Cache Settings */
   #define HW_L2CACHESIZE  20              /* int: L2 Cache Size in Bytes */
   #define HW_L3SETTINGS   21              /* int: L3 Cache Settings */
   #define HW_L3CACHESIZE  22              /* int: L3 Cache Size in Bytes */
   #define HW_TB_FREQ      23              /* int: Bus Frequency */
   #define HW_MEMSIZE      24              /* uint64_t: physical ram size */
   #define HW_AVAILCPU     25              /* int: number of available CPUs */
   #define HW_MAXID        26              /* number of valid hw ids */
   
   #define CTL_HW_NAMES { \
           { 0, 0 }, \
           { "machine", CTLTYPE_STRING }, \
           { "model", CTLTYPE_STRING }, \
           { "ncpu", CTLTYPE_INT }, \
           { "byteorder", CTLTYPE_INT }, \
           { "physmem", CTLTYPE_INT }, \
           { "usermem", CTLTYPE_INT }, \
           { "pagesize", CTLTYPE_INT }, \
           { "disknames", CTLTYPE_STRUCT }, \
           { "diskstats", CTLTYPE_STRUCT }, \
           { "epoch", CTLTYPE_INT }, \
           { "floatingpoint", CTLTYPE_INT }, \
           { "machinearch", CTLTYPE_STRING }, \
           { "vectorunit", CTLTYPE_INT }, \
           { "busfrequency", CTLTYPE_INT }, \
           { "cpufrequency", CTLTYPE_INT }, \
           { "cachelinesize", CTLTYPE_INT }, \
           { "l1icachesize", CTLTYPE_INT }, \
           { "l1dcachesize", CTLTYPE_INT }, \
           { "l2settings", CTLTYPE_INT }, \
           { "l2cachesize", CTLTYPE_INT }, \
           { "l3settings", CTLTYPE_INT }, \
           { "l3cachesize", CTLTYPE_INT }, \
           { "tbfrequency", CTLTYPE_INT }, \
           { "memsize", CTLTYPE_QUAD }, \
           { "availcpu", CTLTYPE_INT } \
   }
   
   /*
    * These are the support HW selectors for sysctlbyname.  Parameters that are byte count or frequencies are 64 bit numbers.
    * All other parameters are 32 bit numbers.
    *
    *   hw.memsize                - The number of bytes of physical memory in the system.
    *
    *   hw.ncpu                   - The number maximum number of processor that could be available this boot.
    *                               Use this value for sizing of static per processor arrays; i.e. processor load statistics.
    *
    *   hw.activecpu              - The number of cpus currently available for executing threads.
    *                               Use this number to determine the number threads to create in SMP aware applications.
    *                               This number can change when power management modes are changed.
    *   
    *   hw.tbfrequency            - This gives the time base frequency used by the OS and is the basis of all timing services.
    *                               In general is is better to use mach's or higher level timing services, but this value
    *                               is needed to convert the PPC Time Base registers to real time.
    *
    *   hw.cpufrequency           - These values provide the current, min and max cpu frequency.  The min and max are for
    *   hw.cpufrequency_max       - all power management modes.  The current frequency is the max frequency in the current mode.
    *   hw.cpufrequency_min       - All frequencies are in Hz.
    *
    *   hw.busfrequency           - These values provide the current, min and max bus frequency.  The min and max are for
    *   hw.busfrequency_max       - all power management modes.  The current frequency is the max frequency in the current mode.
    *   hw.busfrequency_min       - All frequencies are in Hz.
    *
    *   hw.cputype                - These values provide the mach-o cpu type and subtype.  A complete list is in <mach/machine.h>
    *   hw.cpusubtype             - These values should be used to determine what processor family the running cpu is from so that
    *                               the best binary can be chosen, or the best dynamic code generated.  They should not be used
    *                               to determine if a given processor feature is available.
    *
    *   hw.byteorder              - Gives the byte order of the processor.  4321 for big endian, 1234 for little.
    *
    *   hw.pagesize               - Gives the size in bytes of the pages used by the processor and VM system.
    *
    *   hw.cachelinesize          - Gives the size in bytes of the processor's cache lines.
    *                               This value should be use to control the strides of loops that use cache control instructions
    *                               like dcbz, dcbt or dcbst.
    *
    *   hw.l1dcachesize           - These values provide the size in bytes of the L1, L2 and L3 caches.  If a cache is not present
    *   hw.l1icachesize           - then the selector will return and error.
    *   hw.l2cachesize            -
    *   hw.l3cachesize            -
    *
    *
    * These are the selectors for optional processor features.  Selectors that return errors are not support on the system.
    * Supported features will return 1 if they are recommended or 0 if they are supported but are not expected to help performance.
    * Future versions of these selectors may return larger values as necessary so it is best to test for non zero.
    *
    *   hw.optional.floatingpoint - Floating Point Instructions
    *   hw.optional.altivec       - AltiVec Instructions
    *   hw.optional.graphicsops   - Graphics Operations
    *   hw.optional.64bitops      - 64-bit Instructions
    *   hw.optional.fsqrt         - HW Floating Point Square Root Instruction
    *   hw.optional.stfiwx        - Store Floating Point as Integer Word Indexed Instructions
    *   hw.optional.dcba          - Data Cache Block Allocate Instruction
    *   hw.optional.datastreams   - Data Streams Instructions
    *   hw.optional.dcbtstreams   - Data Cache Block Touch Steams Instruction Form
    *
    */
   
   
   /*
    * CTL_USER definitions
    */
   #define USER_CS_PATH             1      /* string: _CS_PATH */
   #define USER_BC_BASE_MAX         2      /* int: BC_BASE_MAX */
   #define USER_BC_DIM_MAX          3      /* int: BC_DIM_MAX */
   #define USER_BC_SCALE_MAX        4      /* int: BC_SCALE_MAX */
   #define USER_BC_STRING_MAX       5      /* int: BC_STRING_MAX */
   #define USER_COLL_WEIGHTS_MAX    6      /* int: COLL_WEIGHTS_MAX */
   #define USER_EXPR_NEST_MAX       7      /* int: EXPR_NEST_MAX */
   #define USER_LINE_MAX            8      /* int: LINE_MAX */
   #define USER_RE_DUP_MAX          9      /* int: RE_DUP_MAX */
   #define USER_POSIX2_VERSION     10      /* int: POSIX2_VERSION */
   #define USER_POSIX2_C_BIND      11      /* int: POSIX2_C_BIND */
   #define USER_POSIX2_C_DEV       12      /* int: POSIX2_C_DEV */
   #define USER_POSIX2_CHAR_TERM   13      /* int: POSIX2_CHAR_TERM */
   #define USER_POSIX2_FORT_DEV    14      /* int: POSIX2_FORT_DEV */
   #define USER_POSIX2_FORT_RUN    15      /* int: POSIX2_FORT_RUN */
   #define USER_POSIX2_LOCALEDEF   16      /* int: POSIX2_LOCALEDEF */
   #define USER_POSIX2_SW_DEV      17      /* int: POSIX2_SW_DEV */
   #define USER_POSIX2_UPE         18      /* int: POSIX2_UPE */
   #define USER_STREAM_MAX         19      /* int: POSIX2_STREAM_MAX */
   #define USER_TZNAME_MAX         20      /* int: POSIX2_TZNAME_MAX */
   #define USER_MAXID              21      /* number of valid user ids */
   
   #define CTL_USER_NAMES { \
           { 0, 0 }, \
           { "cs_path", CTLTYPE_STRING }, \
           { "bc_base_max", CTLTYPE_INT }, \
           { "bc_dim_max", CTLTYPE_INT }, \
           { "bc_scale_max", CTLTYPE_INT }, \
           { "bc_string_max", CTLTYPE_INT }, \
           { "coll_weights_max", CTLTYPE_INT }, \
           { "expr_nest_max", CTLTYPE_INT }, \
           { "line_max", CTLTYPE_INT }, \
           { "re_dup_max", CTLTYPE_INT }, \
           { "posix2_version", CTLTYPE_INT }, \
           { "posix2_c_bind", CTLTYPE_INT }, \
           { "posix2_c_dev", CTLTYPE_INT }, \
           { "posix2_char_term", CTLTYPE_INT }, \
           { "posix2_fort_dev", CTLTYPE_INT }, \
           { "posix2_fort_run", CTLTYPE_INT }, \
           { "posix2_localedef", CTLTYPE_INT }, \
           { "posix2_sw_dev", CTLTYPE_INT }, \
           { "posix2_upe", CTLTYPE_INT }, \
           { "stream_max", CTLTYPE_INT }, \
           { "tzname_max", CTLTYPE_INT } \
   }
   
   
   
   /*
    * CTL_DEBUG definitions
    *
    * Second level identifier specifies which debug variable.
    * Third level identifier specifies which stucture component.
    */
   #define CTL_DEBUG_NAME          0       /* string: variable name */
   #define CTL_DEBUG_VALUE         1       /* int: variable value */
   #define CTL_DEBUG_MAXID         20
   
   #ifdef  KERNEL
   #ifdef __APPLE_API_UNSTABLE
   
   extern struct sysctl_oid_list sysctl__children;
   SYSCTL_DECL(_kern);
   SYSCTL_DECL(_sysctl);
   SYSCTL_DECL(_vm);
   SYSCTL_DECL(_vfs);
   SYSCTL_DECL(_net);
   SYSCTL_DECL(_debug);
   SYSCTL_DECL(_hw);
   SYSCTL_DECL(_machdep);
   SYSCTL_DECL(_user);
   
   
   #ifdef DEBUG
   /*
    * CTL_DEBUG variables.
    *
    * These are declared as separate variables so that they can be
    * individually initialized at the location of their associated
    * variable. The loader prevents multiple use by issuing errors
    * if a variable is initialized in more than one place. They are
    * aggregated into an array in debug_sysctl(), so that it can
    * conveniently locate them when querried. If more debugging
    * variables are added, they must also be declared here and also
    * entered into the array.
    */
   struct ctldebug {
           char    *debugname;     /* name of debugging variable */
           int     *debugvar;      /* pointer to debugging variable */
   };
   extern struct ctldebug debug0, debug1, debug2, debug3, debug4;
   extern struct ctldebug debug5, debug6, debug7, debug8, debug9;
   extern struct ctldebug debug10, debug11, debug12, debug13, debug14;
   extern struct ctldebug debug15, debug16, debug17, debug18, debug19;
   #endif  /* DEBUG */
   
   extern char     machine[];
   extern char     osrelease[];
   extern char     ostype[];
   
   struct linker_set;
   
   void    sysctl_register_set(struct linker_set *lsp);
   void    sysctl_unregister_set(struct linker_set *lsp);
   void    sysctl_mib_init(void);
   int     kernel_sysctl(struct proc *p, int *name, u_int namelen, void *old,
                         size_t *oldlenp, void *newp, size_t newlen);
   int     userland_sysctl(struct proc *p, int *name, u_int namelen, void *old,
                           size_t *oldlenp, int inkernel, void *newp, size_t newlen,
                           size_t *retval);
   
   /*
    * Sysctl handling within the kernel.
    *
    * May be called with either or no funnel held; will take and
    * switch funnels as required.
    */
   int     sysctlbyname __P((const char *, void *, size_t *, void *, size_t));
   
   /*
    * Internal sysctl function calling convention:
    *
    *      (*sysctlfn)(name, namelen, oldval, oldlenp, newval, newlen);
    *
    * The name parameter points at the next component of the name to be
    * interpreted.  The namelen parameter is the number of integers in
    * the name.
    */
   typedef int (sysctlfn)
       __P((int *, u_int, void *, size_t *, void *, size_t, struct proc *));
   
   int sysctl_int __P((void *, size_t *, void *, size_t, int *));
   int sysctl_rdint __P((void *, size_t *, void *, int));
   int sysctl_quad __P((void *, size_t *, void *, size_t, quad_t *));
   int sysctl_rdquad __P((void *, size_t *, void *, quad_t));
   int sysctl_string __P((void *, size_t *, void *, size_t, char *, int));
   int sysctl_rdstring __P((void *, size_t *, void *, char *));
   int sysctl_rdstruct __P((void *, size_t *, void *, void *, int));
   
   #endif /* __APPLE_API_UNSTABLE */
   #else   /* !KERNEL */
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int     sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
   int     sysctlbyname __P((const char *, void *, size_t *, void *, size_t));
   int     sysctlnametomib __P((const char *, int *, size_t *));
   __END_DECLS
   #endif  /* KERNEL */
   #endif  /* !_SYS_SYSCTL_H_ */

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