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

     /*
      * 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
     * $FreeBSD: releng/5.2/sys/sys/sysctl.h 122707 2003-11-14 21:37:35Z trhodes $
     */
    
    #ifndef _SYS_SYSCTL_H_
    #define _SYS_SYSCTL_H_
    
    #include <sys/queue.h>
    
    struct thread;
    /*
     * 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(8) 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 CTLTYPE_UINT    6       /* name describes an unsigned integer */
    #define CTLTYPE_LONG    7       /* name describes a long */
    #define CTLTYPE_ULONG   8       /* name describes an unsigned long */
    
    #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_PRISON  0x04000000      /* Prisoned roots can fiddle */
    #define CTLFLAG_DYN     0x02000000      /* Dynamic oid - can be freed */
    #define CTLFLAG_SKIP    0x01000000      /* Skip this sysctl when listing */
    #define CTLMASK_SECURE  0x00F00000      /* Secure level */
    #define CTLFLAG_TUN     0x00080000      /* Tunable variable */
    #define CTLFLAG_RDTUN   (CTLFLAG_RD|CTLFLAG_TUN)
    
    /*
     * Secure level.   Note that CTLFLAG_SECURE == CTLFLAG_SECURE1.  
     *
     * Secure when the securelevel is raised to at least N.
     */
    #define CTLSHIFT_SECURE 20
    #define CTLFLAG_SECURE1 (CTLFLAG_SECURE | (0 << CTLSHIFT_SECURE))
   #define CTLFLAG_SECURE2 (CTLFLAG_SECURE | (1 << CTLSHIFT_SECURE))
   #define CTLFLAG_SECURE3 (CTLFLAG_SECURE | (2 << CTLSHIFT_SECURE))
   
   /*
    * 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)
   
   /*
    * The starting number for dynamically-assigned entries.  WARNING!
    * ALL static sysctl entries should have numbers LESS than this!
    */
   #define CTL_AUTO_START  0x100
   
   #ifdef _KERNEL
   #define SYSCTL_HANDLER_ARGS struct sysctl_oid *oidp, void *arg1, int arg2, \
           struct sysctl_req *req
   
   /* definitions for sysctl_req 'lock' member */
   #define REQ_UNLOCKED    0       /* not locked and not wired */
   #define REQ_LOCKED      1       /* locked and not wired */
   #define REQ_WIRED       2       /* locked and wired */
   
   /*
    * 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 thread   *td;            /* used for access checking */
           int             lock;           /* locking/wiring state */
           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;
           u_int           oid_kind;
           void            *oid_arg1;
           int             oid_arg2;
           const char      *oid_name;
           int             (*oid_handler)(SYSCTL_HANDLER_ARGS);
           const char      *oid_fmt;
           int             oid_refcnt;
           const char      *descr;
   };
   
   #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_intptr(SYSCTL_HANDLER_ARGS);
   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 a static oid to allow child oids to be added to it. */
   #define SYSCTL_DECL(name)                                       \
           extern struct sysctl_oid_list sysctl_##name##_children
   
   /* Hide these in macros */
   #define SYSCTL_CHILDREN(oid_ptr) (struct sysctl_oid_list *) \
           (oid_ptr)->oid_arg1
   #define SYSCTL_STATIC_CHILDREN(oid_name) \
           (&sysctl_##oid_name##_children)
   
   /* === Structs and macros related to context handling === */
   
   /* All dynamically created sysctls can be tracked in a context list. */
   struct sysctl_ctx_entry {
           struct sysctl_oid *entry;
           TAILQ_ENTRY(sysctl_ctx_entry) link;
   };
   
   TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
   
   #define SYSCTL_NODE_CHILDREN(parent, name) \
           sysctl_##parent##_##name##_children
   
   /* This constructs a "raw" MIB oid. */
   #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
           static struct sysctl_oid sysctl__##parent##_##name = {           \
                   &sysctl_##parent##_children, { 0 },                      \
                   nbr, kind, a1, a2, #name, handler, fmt, 0, descr };      \
           DATA_SET(sysctl_set, sysctl__##parent##_##name)
   
   #define SYSCTL_ADD_OID(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
           sysctl_add_oid(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr)
   
   /* This constructs a node from which other oids can hang. */
   #define SYSCTL_NODE(parent, nbr, name, access, handler, descr)              \
           struct sysctl_oid_list SYSCTL_NODE_CHILDREN(parent, name);          \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|(access),                \
                      (void*)&SYSCTL_NODE_CHILDREN(parent, name), 0, handler, \
                      "N", descr)
   
   #define SYSCTL_ADD_NODE(ctx, parent, nbr, name, access, handler, descr)     \
           sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|(access),       \
           0, 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)
   
   #define SYSCTL_ADD_STRING(ctx, parent, nbr, name, access, arg, len, descr)  \
           sysctl_add_oid(ctx, 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)
   
   #define SYSCTL_ADD_INT(ctx, parent, nbr, name, access, ptr, val, descr)     \
           sysctl_add_oid(ctx, 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_UINT|(access), \
                   ptr, val, sysctl_handle_int, "IU", descr)
   
   #define SYSCTL_ADD_UINT(ctx, parent, nbr, name, access, ptr, val, descr)    \
           sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_UINT|(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, val, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_LONG|(access), \
                   ptr, val, sysctl_handle_long, "L", descr)
   
   #define SYSCTL_ADD_LONG(ctx, parent, nbr, name, access, ptr, descr)         \
           sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_LONG|(access),       \
           ptr, 0, sysctl_handle_long, "L", descr)
   
   /* Oid for an unsigned long.  The pointer must be non NULL. */
   #define SYSCTL_ULONG(parent, nbr, name, access, ptr, val, descr) \
           SYSCTL_OID(parent, nbr, name, CTLTYPE_ULONG|(access), \
                   ptr, val, sysctl_handle_long, "LU", descr)
   
   #define SYSCTL_ADD_ULONG(ctx, parent, nbr, name, access, ptr, descr)        \
           sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_ULONG|(access),      \
           ptr, 0, sysctl_handle_long, "LU", 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)
   
   #define SYSCTL_ADD_OPAQUE(ctx, parent, nbr, name, access, ptr, len, fmt, descr)\
           sysctl_add_oid(ctx, 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)
   
   #define SYSCTL_ADD_STRUCT(ctx, parent, nbr, name, access, ptr, type, descr) \
           sysctl_add_oid(ctx, 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)
   
   #define SYSCTL_ADD_PROC(ctx, parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
           sysctl_add_oid(ctx, parent, nbr, name, (access),                            \
           ptr, arg, handler, fmt, descr)
   
   #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               /* filesystem, 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_P1003_1B    9               /* POSIX 1003.1B */
   #define CTL_MAXID       10              /* 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 }, \
           { "p1003_1b", 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_UPDATEINTERVAL     23      /* int: update process sleep time */
   #define KERN_OSRELDATE          24      /* int: kernel release date */
   #define KERN_NTP_PLL            25      /* node: NTP PLL control */
   #define KERN_BOOTFILE           26      /* string: name of booted kernel */
   #define KERN_MAXFILESPERPROC    27      /* int: max open files per proc */
   #define KERN_MAXPROCPERUID      28      /* int: max processes per uid */
   #define KERN_DUMPDEV            29      /* dev_t: device to dump on */
   #define KERN_IPC                30      /* node: anything related to IPC */
   #define KERN_DUMMY              31      /* unused */
   #define KERN_PS_STRINGS         32      /* int: address of PS_STRINGS */
   #define KERN_USRSTACK           33      /* int: address of USRSTACK */
   #define KERN_LOGSIGEXIT         34      /* int: do we log sigexit procs? */
   #define KERN_IOV_MAX            35      /* int: value of UIO_MAXIOV */
   #define KERN_MAXID              36      /* number of valid kern ids */
   
   #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_UINT }, \
           { "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 }, \
           { "update", CTLTYPE_INT }, \
           { "osreldate", CTLTYPE_INT }, \
           { "ntp_pll", CTLTYPE_NODE }, \
           { "bootfile", CTLTYPE_STRING }, \
           { "maxfilesperproc", CTLTYPE_INT }, \
           { "maxprocperuid", CTLTYPE_INT }, \
           { "ipc", CTLTYPE_NODE }, \
           { "dummy", CTLTYPE_INT }, \
           { "ps_strings", CTLTYPE_INT }, \
           { "usrstack", CTLTYPE_INT }, \
           { "logsigexit", CTLTYPE_INT }, \
           { "iov_max", CTLTYPE_INT }, \
   }
   
   /*
    * 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 */
   #define KERN_PROC_ARGS          7       /* get/set arguments/proctitle */
   #define KERN_PROC_PROC          8       /* only return procs */
   #define KERN_PROC_SV_NAME       9       /* get syscall vector name */
   
   /*
    * 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? */
   
   /*
    * 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_FLOATINGPT   10              /* int: has HW floating point? */
   #define HW_MACHINE_ARCH 11              /* string: machine architecture */
   #define HW_MAXID        12              /* 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_ULONG }, \
           { "usermem", CTLTYPE_ULONG }, \
           { "pagesize", CTLTYPE_INT }, \
           { "disknames", CTLTYPE_STRUCT }, \
           { "diskstats", CTLTYPE_STRUCT }, \
           { "floatingpoint", CTLTYPE_INT }, \
   }
   
   /*
    * 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 }, \
   }
   
   #define CTL_P1003_1B_ASYNCHRONOUS_IO            1       /* boolean */
   #define CTL_P1003_1B_MAPPED_FILES               2       /* boolean */
   #define CTL_P1003_1B_MEMLOCK                    3       /* boolean */
   #define CTL_P1003_1B_MEMLOCK_RANGE              4       /* boolean */
   #define CTL_P1003_1B_MEMORY_PROTECTION          5       /* boolean */
   #define CTL_P1003_1B_MESSAGE_PASSING            6       /* boolean */
   #define CTL_P1003_1B_PRIORITIZED_IO             7       /* boolean */
   #define CTL_P1003_1B_PRIORITY_SCHEDULING        8       /* boolean */
   #define CTL_P1003_1B_REALTIME_SIGNALS           9       /* boolean */
   #define CTL_P1003_1B_SEMAPHORES                 10      /* boolean */
   #define CTL_P1003_1B_FSYNC                      11      /* boolean */
   #define CTL_P1003_1B_SHARED_MEMORY_OBJECTS      12      /* boolean */
   #define CTL_P1003_1B_SYNCHRONIZED_IO            13      /* boolean */
   #define CTL_P1003_1B_TIMERS                     14      /* boolean */
   #define CTL_P1003_1B_AIO_LISTIO_MAX             15      /* int */
   #define CTL_P1003_1B_AIO_MAX                    16      /* int */
   #define CTL_P1003_1B_AIO_PRIO_DELTA_MAX         17      /* int */
   #define CTL_P1003_1B_DELAYTIMER_MAX             18      /* int */
   #define CTL_P1003_1B_MQ_OPEN_MAX                19      /* int */
   #define CTL_P1003_1B_PAGESIZE                   20      /* int */
   #define CTL_P1003_1B_RTSIG_MAX                  21      /* int */
   #define CTL_P1003_1B_SEM_NSEMS_MAX              22      /* int */
   #define CTL_P1003_1B_SEM_VALUE_MAX              23      /* int */
   #define CTL_P1003_1B_SIGQUEUE_MAX               24      /* int */
   #define CTL_P1003_1B_TIMER_MAX                  25      /* int */
   
   #define CTL_P1003_1B_MAXID              26
   
   #define CTL_P1003_1B_NAMES { \
           { 0, 0 }, \
           { "asynchronous_io", CTLTYPE_INT }, \
           { "mapped_files", CTLTYPE_INT }, \
           { "memlock", CTLTYPE_INT }, \
           { "memlock_range", CTLTYPE_INT }, \
           { "memory_protection", CTLTYPE_INT }, \
           { "message_passing", CTLTYPE_INT }, \
           { "prioritized_io", CTLTYPE_INT }, \
           { "priority_scheduling", CTLTYPE_INT }, \
           { "realtime_signals", CTLTYPE_INT }, \
           { "semaphores", CTLTYPE_INT }, \
           { "fsync", CTLTYPE_INT }, \
           { "shared_memory_objects", CTLTYPE_INT }, \
           { "synchronized_io", CTLTYPE_INT }, \
           { "timers", CTLTYPE_INT }, \
           { "aio_listio_max", CTLTYPE_INT }, \
           { "aio_max", CTLTYPE_INT }, \
           { "aio_prio_delta_max", CTLTYPE_INT }, \
           { "delaytimer_max", CTLTYPE_INT }, \
           { "mq_open_max", CTLTYPE_INT }, \
           { "pagesize", CTLTYPE_INT }, \
           { "rtsig_max", CTLTYPE_INT }, \
           { "nsems_max", CTLTYPE_INT }, \
           { "sem_value_max", CTLTYPE_INT }, \
           { "sigqueue_max", CTLTYPE_INT }, \
           { "timer_max", CTLTYPE_INT }, \
   }
   
   #ifdef _KERNEL
   
   /*
    * Declare some common oids.
    */
   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(_debug_sizeof);
   SYSCTL_DECL(_hw);
   SYSCTL_DECL(_machdep);
   SYSCTL_DECL(_user);
   SYSCTL_DECL(_compat);
   
   extern char     machine[];
   extern char     osrelease[];
   extern char     ostype[];
   extern char     kern_ident[];
   
   /* Dynamic oid handling */
   struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist,
                   struct sysctl_oid_list *parent, int nbr, const char *name,
                   int kind, void *arg1, int arg2,
                   int (*handler) (SYSCTL_HANDLER_ARGS),
                   const char *fmt, const char *descr);
   int     sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse);
   int     sysctl_ctx_init(struct sysctl_ctx_list *clist);
   int     sysctl_ctx_free(struct sysctl_ctx_list *clist);
   struct  sysctl_ctx_entry *sysctl_ctx_entry_add(struct sysctl_ctx_list *clist,
                   struct sysctl_oid *oidp);
   struct  sysctl_ctx_entry *sysctl_ctx_entry_find(struct sysctl_ctx_list *clist,
                   struct sysctl_oid *oidp);
   int     sysctl_ctx_entry_del(struct sysctl_ctx_list *clist,
                   struct sysctl_oid *oidp);
   
   int     kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
                         size_t *oldlenp, void *new, size_t newlen,
                         size_t *retval);
   int     kernel_sysctlbyname(struct thread *td, char *name,
                   void *old, size_t *oldlenp, void *new, size_t newlen,
                   size_t *retval);
   int     userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
                           size_t *oldlenp, int inkernel, void *new, size_t newlen,
                           size_t *retval);
   int     sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
                           int *nindx, struct sysctl_req *req);
   void    sysctl_wire_old_buffer(struct sysctl_req *req, size_t len);
   
   #else   /* !_KERNEL */
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int     sysctl(int *, u_int, void *, size_t *, void *, size_t);
   int     sysctlbyname(const char *, void *, size_t *, void *, size_t);
   int     sysctlnametomib(const char *, int *, size_t *);
   __END_DECLS
   #endif  /* _KERNEL */
   
   #endif  /* !_SYS_SYSCTL_H_ */

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