sys/sys/sysctl.h

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Mike Karels at Berkeley Software Design, Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)sysctl.h    8.1 (Berkeley) 6/2/93
  33  * $FreeBSD: head/sys/sys/sysctl.h 204170 2010-02-21 13:57:02Z ed $
  34  */
  35
  36 #ifndef _SYS_SYSCTL_H_
  37 #define _SYS_SYSCTL_H_
  38
  39 #ifndef _SYS_TYPES_H_
  40 #include <sys/types.h>
  41 #endif
  42 #ifndef _SYS_QUEUE_H_
  43 #include <sys/queue.h>
  44 #endif
  45
  46 /*
  47  * Definitions for sysctl call.  The sysctl call uses a hierarchical name
  48  * for objects that can be examined or modified.  The name is expressed as
  49  * a sequence of integers.  Like a file path name, the meaning of each
  50  * component depends on its place in the hierarchy.  The top-level and kern
  51  * identifiers are defined here, and other identifiers are defined in the
  52  * respective subsystem header files.
  53  */
  54
  55 #define CTL_MAXNAME     12      /* largest number of components supported */
  56
  57 /*
  58  * Each subsystem defined by sysctl defines a list of variables
  59  * for that subsystem. Each name is either a node with further
  60  * levels defined below it, or it is a leaf of some particular
  61  * type given below. Each sysctl level defines a set of name/type
  62  * pairs to be used by sysctl(1) in manipulating the subsystem.
  63  */
  64 struct ctlname {
  65         char    *ctl_name;      /* subsystem name */
  66         int     ctl_type;       /* type of name */
  67 };
  68
  69 #define CTLTYPE         0x1f    /* Mask for the type */
  70 #define CTLTYPE_NODE    0x01    /* name is a node */
  71 #define CTLTYPE_INT     0x02    /* name describes an integer */
  72 #define CTLTYPE_STRING  0x03    /* name describes a string */
  73 #define CTLTYPE_S64     0x04    /* name describes a signed 64-bit number */
  74 #define CTLTYPE_QUAD    CTLTYPE_S64 /* name describes a signed 64-bit number */
  75 #define CTLTYPE_OPAQUE  0x05    /* name describes a structure */
  76 #define CTLTYPE_STRUCT  CTLTYPE_OPAQUE  /* name describes a structure */
  77 #define CTLTYPE_UINT    0x06    /* name describes an unsigned integer */
  78 #define CTLTYPE_LONG    0x07    /* name describes a long */
  79 #define CTLTYPE_ULONG   0x08    /* name describes an unsigned long */
  80 #define CTLTYPE_U64     0x09    /* name describes an unsigned 64-bit number */
  81 #define CTLTYPE_UQUAD   CTLTYPE_U64 /* name describes an unsgn 64-bit number */
  82 #define CTLTYPE_U8      0x0a    /* name describes an unsigned 8-bit number */
  83 #define CTLTYPE_U16     0x0b    /* name describes an unsigned 16-bit number */
  84 #define CTLTYPE_S8      0x0c    /* name describes a signed 8-bit number */
  85 #define CTLTYPE_S16     0x0d    /* name describes a signed 16-bit number */
  86 #define CTLTYPE_S32     0x0e    /* name describes a signed 32-bit number */
  87 #define CTLTYPE_U32     0x0f    /* name describes an unsigned 32-bit number */
  88
  89 #define CTLTYPE_BIT32(n) (0x10 | ((n) << CTLSHIFT_BITFLD))
  90 #define CTLTYPE_BIT64(n) (0x11 | ((n) << CTLSHIFT_BITFLD))
  91
  92 #define CTLFLAG_RD      0x80000000      /* Allow reads of variable */
  93 #define CTLFLAG_WR      0x40000000      /* Allow writes to the variable */
  94 #define CTLFLAG_RW      (CTLFLAG_RD|CTLFLAG_WR)
  95 #define CTLFLAG_ANYBODY 0x10000000      /* All users can set this var */
  96 #define CTLFLAG_SECURE  0x08000000      /* Permit set only if securelevel<=0 */
  97 #define CTLFLAG_PRISON  0x04000000      /* Prisoned roots can fiddle */
  98 #define CTLFLAG_DYN     0x02000000      /* Dynamic oid - can be freed */
  99 #define CTLFLAG_SKIP    0x01000000      /* Skip this sysctl when listing */
 100 #define CTLMASK_SECURE  0x00F00000      /* Secure level */
 101 #define CTLFLAG_DYING   0x00010000      /* Oid is being removed */
 102 #define CTLFLAG_SHLOCK  0x00008000      /* shlock on write (def is exlock) */
 103 #define CTLFLAG_EXLOCK  0x00004000      /* exlock on read (def is shlock) */
 104 #define CTLFLAG_NOLOCK  0x00002000      /* no lock required */
 105 #define CTLFLAG_RSV12   0x00001000
 106 #define CTLMASK_BITFLD  0x00000FC0      /* bitfield extension */
 107 #define CTLFLAG_RSV5    0x00000020
 108 #define CTLMASK_TYPE    0x0000001F      /* type field */
 109
 110 #define CTLSHIFT_BITFLD 6
 111 #define CTLINFO_MAXBITN 64
 112
 113 /*
 114  * USE THIS instead of a hardwired number from the categories below
 115  * to get dynamically assigned sysctl entries using the linker-set
 116  * technology. This is the way nearly all new sysctl variables should
 117  * be implemented.
 118  * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
 119  */
 120 #define OID_AUTO        (-1)
 121
 122 #ifdef _KERNEL
 123
 124 #include <sys/kernel.h>                 /* for DATA_SET */
 125 #ifndef _SYS_LOCK_H_
 126 #include <sys/lock.h>
 127 #endif
 128
 129 #define SYSCTL_HANDLER_ARGS struct sysctl_oid *oidp, void *arg1, int arg2, \
 130         struct sysctl_req *req
 131
 132 /*
 133  * This describes the access space for a sysctl request.  This is needed
 134  * so that we can use the interface from the kernel or from user-space.
 135  */
 136 struct sysctl_req {
 137         struct thread   *td;            /* used for access checking */
 138         int              lock;          /* wiring state */
 139         void            *oldptr;
 140         size_t           oldlen;
 141         size_t           oldidx;
 142         int             (*oldfunc)(struct sysctl_req *, const void *, size_t);
 143         void            *newptr;
 144         size_t           newlen;
 145         size_t           newidx;
 146         int             (*newfunc)(struct sysctl_req *, void *, size_t);
 147         size_t           validlen;
 148         int              flags;
 149 };
 150
 151 SLIST_HEAD(sysctl_oid_list, sysctl_oid);
 152
 153 /*
 154  * This describes one "oid" in the MIB tree.  Potentially more nodes can
 155  * be hidden behind it, expanded by the handler.
 156  */
 157 struct sysctl_oid {
 158         struct sysctl_oid_list *oid_parent;
 159         SLIST_ENTRY(sysctl_oid) oid_link;
 160         int             oid_number;
 161         int             oid_kind;
 162         void            *oid_arg1;
 163         int             oid_arg2;
 164         const char      *oid_name;
 165         int             (*oid_handler)(SYSCTL_HANDLER_ARGS);
 166         const char      *oid_fmt;
 167         int             oid_refcnt;
 168         u_int            oid_running;
 169         const char      *oid_descr;
 170         struct lock     oid_lock;       /* per-node lock */
 171 };
 172
 173 #define SYSCTL_IN(r, p, l)      (r->newfunc)(r, p, l)
 174 #define SYSCTL_OUT(r, p, l)     (r->oldfunc)(r, p, l)
 175 #define SYSCTL_OUT_STR(r, p)    (r->oldfunc)(r, p, strlen(p) + 1)
 176
 177 int sysctl_handle_8(SYSCTL_HANDLER_ARGS);
 178 int sysctl_handle_16(SYSCTL_HANDLER_ARGS);
 179 int sysctl_handle_32(SYSCTL_HANDLER_ARGS);
 180 int sysctl_handle_64(SYSCTL_HANDLER_ARGS);
 181 int sysctl_handle_int(SYSCTL_HANDLER_ARGS);
 182 int sysctl_handle_long(SYSCTL_HANDLER_ARGS);
 183 int sysctl_handle_quad(SYSCTL_HANDLER_ARGS);
 184 int sysctl_handle_bit32(SYSCTL_HANDLER_ARGS);
 185 int sysctl_handle_bit64(SYSCTL_HANDLER_ARGS);
 186 int sysctl_handle_intptr(SYSCTL_HANDLER_ARGS);
 187 int sysctl_handle_string(SYSCTL_HANDLER_ARGS);
 188 int sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
 189
 190 extern struct lock sysctllock;
 191
 192 #define SYSCTL_XLOCK()          _sysctl_xlock()
 193 #define SYSCTL_XUNLOCK()        _sysctl_xunlock()
 194 #define SYSCTL_SLOCK()          lockmgr(&mycpu->gd_sysctllock, LK_SHARED)
 195 #define SYSCTL_SUNLOCK()        lockmgr(&mycpu->gd_sysctllock, LK_RELEASE)
 196 #define SYSCTL_ASSERT_LOCKED() \
 197         KKASSERT(lockstatus(&mycpu->gd_sysctllock, curthread) != 0)
 198
 199 /*
 200  * These functions are used to add/remove an oid from the mib.
 201  */
 202 void sysctl_register_oid(struct sysctl_oid *oidp);
 203 void sysctl_unregister_oid(struct sysctl_oid *oidp);
 204
 205 /* Declare a static oid to allow child oids to be added to it. */
 206 #define SYSCTL_DECL(name)                                       \
 207         extern struct sysctl_oid_list sysctl_##name##_children
 208
 209 /* Hide these in macros */
 210 #define SYSCTL_SET_CHILDREN(oid_ptr, children) do {                     \
 211         (oid_ptr)->oid_arg1 = (children);                               \
 212 } while(0)
 213 #define SYSCTL_CHILDREN(oid_ptr) (struct sysctl_oid_list *) \
 214         (oid_ptr)->oid_arg1
 215 #define SYSCTL_STATIC_CHILDREN(oid_name) \
 216         (&sysctl_##oid_name##_children)
 217
 218 /* === Structs and macros related to context handling === */
 219
 220 /* All dynamically created sysctls can be tracked in a context list. */
 221 struct sysctl_ctx_entry {
 222         struct sysctl_oid *entry;
 223         TAILQ_ENTRY(sysctl_ctx_entry) link;
 224 };
 225
 226 TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
 227
 228 #define SYSCTL_NODE_CHILDREN(parent, name) \
 229         sysctl_##parent##_##name##_children
 230
 231 #ifndef NO_SYSCTL_DESCR
 232 #define __DESCR(d) d
 233 #else
 234 #define __DESCR(d) ""
 235 #endif
 236
 237 /* This constructs a "raw" MIB oid. */
 238 #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr)\
 239         static struct sysctl_oid sysctl__##parent##_##name = {          \
 240                 &sysctl_##parent##_children,                            \
 241                 { NULL },                                               \
 242                 nbr,                                                    \
 243                 kind,                                                   \
 244                 a1,                                                     \
 245                 a2,                                                     \
 246                 #name,                                                  \
 247                 handler,                                                \
 248                 fmt,                                                    \
 249                 0,                                                      \
 250                 0,                                                      \
 251                 __DESCR(descr)                                          \
 252                 };                                                      \
 253         DATA_SET(sysctl_set, sysctl__##parent##_##name)
 254
 255 #define SYSCTL_ADD_OID(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
 256         sysctl_add_oid(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr);
 257
 258 /* This constructs a node from which other oids can hang. */
 259 #define SYSCTL_NODE(parent, nbr, name, access, handler, descr)          \
 260         struct sysctl_oid_list SYSCTL_NODE_CHILDREN(parent, name);      \
 261         SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|(access),            \
 262             (void*)&SYSCTL_NODE_CHILDREN(parent, name), 0, handler, "N", descr)
 263
 264 #define SYSCTL_ADD_NODE(ctx, parent, nbr, name, access, handler, descr) \
 265         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|(access),   \
 266         0, 0, handler, "N", descr)
 267
 268 /* Oid for a string.  len can be 0 to indicate '\0' termination. */
 269 #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)       \
 270         SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access),          \
 271                 arg, len, sysctl_handle_string, "A", descr)
 272
 273 #define SYSCTL_ADD_STRING(ctx, parent, nbr, name, access, arg, len, descr) \
 274         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_STRING|(access), \
 275         arg, len, sysctl_handle_string, "A", descr)
 276
 277 /* Oid for an int.  If ptr is NULL, val is returned. */
 278 #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)          \
 279         SYSCTL_OID(parent, nbr, name,                                   \
 280                 CTLTYPE_INT|CTLFLAG_NOLOCK|(access),                    \
 281                 ptr, val, sysctl_handle_int, "I", descr)
 282
 283 #define SYSCTL_ADD_INT(ctx, parent, nbr, name, access, ptr, val, descr) \
 284         sysctl_add_oid(ctx, parent, nbr, name,                          \
 285                 CTLTYPE_INT|CTLFLAG_NOLOCK|(access),                    \
 286         ptr, val, sysctl_handle_int, "I", descr)
 287
 288 /* Oid for a quad.  If ptr is NULL, val is returned. */
 289 #define SYSCTL_QUAD(parent, nbr, name, access, ptr, val, descr)         \
 290         SYSCTL_OID(parent, nbr, name,                                   \
 291                 CTLTYPE_QUAD|CTLFLAG_NOLOCK|(access),                   \
 292                 ptr, val, sysctl_handle_quad, "Q", descr)
 293
 294 #define SYSCTL_ADD_QUAD(ctx, parent, nbr, name, access, ptr, val, descr) \
 295         sysctl_add_oid(ctx, parent, nbr, name,                          \
 296                 CTLTYPE_QUAD|CTLFLAG_NOLOCK|(access),                   \
 297                 ptr, val, sysctl_handle_quad, "Q", descr)
 298
 299 /* Oid for an unsigned quad.  If ptr is NULL, val is returned. */
 300 #define SYSCTL_UQUAD(parent, nbr, name, access, ptr, val, descr)        \
 301         SYSCTL_OID(parent, nbr, name,                                   \
 302                 CTLTYPE_UQUAD|CTLFLAG_NOLOCK|(access),                  \
 303                 ptr, val, sysctl_handle_quad, "QU", descr)
 304
 305 #define SYSCTL_ADD_UQUAD(ctx, parent, nbr, name, access, ptr, val, descr) \
 306         sysctl_add_oid(ctx, parent, nbr, name,                          \
 307                 CTLTYPE_UQUAD|CTLFLAG_NOLOCK|(access),                  \
 308                 ptr, val, sysctl_handle_quad, "QU", descr)
 309
 310 /* Oid for an unsigned int.  If ptr is NULL, val is returned. */
 311 #define SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr)         \
 312         SYSCTL_OID(parent, nbr, name,                                   \
 313                 CTLTYPE_UINT|CTLFLAG_NOLOCK|(access),                   \
 314                 ptr, val, sysctl_handle_int, "IU", descr)
 315
 316 #define SYSCTL_ADD_UINT(ctx, parent, nbr, name, access, ptr, val, descr) \
 317         sysctl_add_oid(ctx, parent, nbr, name,                          \
 318                 CTLTYPE_UINT|CTLFLAG_NOLOCK|(access),                   \
 319                 ptr, val, sysctl_handle_int, "IU", descr)
 320
 321 /* Oid for a long.  The pointer must be non NULL. */
 322 #define SYSCTL_LONG(parent, nbr, name, access, ptr, val, descr)         \
 323         SYSCTL_OID(parent, nbr, name,                                   \
 324                 CTLTYPE_LONG|CTLFLAG_NOLOCK|(access),                   \
 325                 ptr, val, sysctl_handle_long, "L", descr)
 326
 327 #define SYSCTL_ADD_LONG(ctx, parent, nbr, name, access, ptr, descr)     \
 328         sysctl_add_oid(ctx, parent, nbr, name,                          \
 329                 CTLTYPE_LONG|CTLFLAG_NOLOCK|(access),                   \
 330                 ptr, 0, sysctl_handle_long, "L", descr)
 331
 332 /* Oid for a long.  The pointer must be non NULL. */
 333 #define SYSCTL_ULONG(parent, nbr, name, access, ptr, val, descr)        \
 334         SYSCTL_OID(parent, nbr, name,                                   \
 335                 CTLTYPE_ULONG|CTLFLAG_NOLOCK|(access),                  \
 336                 ptr, val, sysctl_handle_long, "LU", descr)
 337
 338 #define SYSCTL_ADD_ULONG(ctx, parent, nbr, name, access, ptr, descr)    \
 339         sysctl_add_oid(ctx, parent, nbr, name,                          \
 340                 CTLTYPE_ULONG|CTLFLAG_NOLOCK|(access),                  \
 341                 ptr, 0, sysctl_handle_long, "LU", descr)
 342
 343 /* Oid for a signed 8-bit int.  The pointer must be non NULL. */
 344 #define SYSCTL_S8(parent, nbr, name, access, ptr, val, descr)   \
 345         SYSCTL_OID(parent, nbr, name, CTLTYPE_S8|(access),              \
 346                 ptr, val, sysctl_handle_8, "C", descr)
 347
 348 #define SYSCTL_ADD_S8(ctx, parent, nbr, name, access, ptr, descr)       \
 349         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_S8|(access),     \
 350         ptr, 0, sysctl_handle_8, "C", descr)
 351
 352 /* Oid for a signed 16-bit int.  The pointer must be non NULL. */
 353 #define SYSCTL_S16(parent, nbr, name, access, ptr, val, descr)  \
 354         SYSCTL_OID(parent, nbr, name, CTLTYPE_S16|(access),             \
 355                 ptr, val, sysctl_handle_16, "S", descr)
 356
 357 #define SYSCTL_ADD_S16(ctx, parent, nbr, name, access, ptr, descr)      \
 358         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_S16|(access),    \
 359         ptr, 0, sysctl_handle_16, "S", descr)
 360
 361 /* Oid for a signed 32-bit int.  The pointer must be non NULL. */
 362 #define SYSCTL_S32(parent, nbr, name, access, ptr, val, descr)  \
 363         SYSCTL_OID(parent, nbr, name, CTLTYPE_S32|(access),             \
 364                 ptr, val, sysctl_handle_32, "I", descr)
 365
 366 #define SYSCTL_ADD_S32(ctx, parent, nbr, name, access, ptr, descr)      \
 367         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_S32|(access),    \
 368         ptr, 0, sysctl_handle_32, "I", descr)
 369
 370 /* Oid for a signed 64-bit int.  The pointer must be non NULL. */
 371 #define SYSCTL_S64(parent, nbr, name, access, ptr, val, descr)  \
 372         SYSCTL_OID(parent, nbr, name, CTLTYPE_S64|(access),             \
 373                 ptr, val, sysctl_handle_64, "Q", descr)
 374
 375 #define SYSCTL_ADD_S64(ctx, parent, nbr, name, access, ptr, descr)      \
 376         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_S64|(access),    \
 377         ptr, 0, sysctl_handle_64, "Q", descr)
 378
 379 /* Oid for an unsigned 8-bit int.  The pointer must be non NULL. */
 380 #define SYSCTL_U8(parent, nbr, name, access, ptr, val, descr)   \
 381         SYSCTL_OID(parent, nbr, name, CTLTYPE_U8|(access),              \
 382                 ptr, val, sysctl_handle_8, "CU", descr)
 383
 384 #define SYSCTL_ADD_U8(ctx, parent, nbr, name, access, ptr, descr)       \
 385         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_U8|(access),     \
 386         ptr, 0, sysctl_handle_8, "CU", descr)
 387
 388 /* Oid for an unsigned 16-bit int.  The pointer must be non NULL. */
 389 #define SYSCTL_U16(parent, nbr, name, access, ptr, val, descr)  \
 390         SYSCTL_OID(parent, nbr, name, CTLTYPE_U16|(access),             \
 391                 ptr, val, sysctl_handle_16, "SU", descr)
 392
 393 #define SYSCTL_ADD_U16(ctx, parent, nbr, name, access, ptr, descr)      \
 394         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_U16|(access),    \
 395         ptr, 0, sysctl_handle_16, "SU", descr)
 396
 397 /* Oid for an unsigned 32-bit int.  The pointer must be non NULL. */
 398 #define SYSCTL_U32(parent, nbr, name, access, ptr, val, descr)  \
 399         SYSCTL_OID(parent, nbr, name, CTLTYPE_U32|(access),             \
 400                 ptr, val, sysctl_handle_32, "IU", descr)
 401
 402 #define SYSCTL_ADD_U32(ctx, parent, nbr, name, access, ptr, descr)      \
 403         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_U32|(access),    \
 404         ptr, 0, sysctl_handle_32, "IU", descr)
 405
 406 /* Oid for an unsigned 64-bit int.  The pointer must be non NULL. */
 407 #define SYSCTL_U64(parent, nbr, name, access, ptr, val, descr)  \
 408         SYSCTL_OID(parent, nbr, name, CTLTYPE_U64|(access),             \
 409                 ptr, val, sysctl_handle_64, "QU", descr)
 410
 411 #define SYSCTL_ADD_U64(ctx, parent, nbr, name, access, ptr, descr)      \
 412         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_U64|(access),    \
 413         ptr, 0, sysctl_handle_64, "QU", descr)
 414
 415 /* Oid for a bit in a uint32_t.  If ptr is NULL, val is returned. */
 416 /* API passes and returns an integer */
 417 #define SYSCTL_BIT32(parent, nbr, name, access, ptr, val, bit, descr)   \
 418         SYSCTL_OID(parent, nbr, name,                                   \
 419                 CTLTYPE_BIT32(bit)|CTLFLAG_NOLOCK|(access),             \
 420                 ptr, val, sysctl_handle_bit32, "I", descr)
 421
 422 #define SYSCTL_ADD_BIT32(ctx, parent, nbr, name, access, ptr, val, bit, descr) \
 423         sysctl_add_oid(ctx, parent, nbr, name,                          \
 424             CTLTYPE_BIT32(bit)|CTLFLAG_NOLOCK|(access),                 \
 425             ptr, val, sysctl_handle_bit32, "I", descr)
 426
 427 /* Oid for a bit in a uint64_t.  If ptr is NULL, val is returned. */
 428 /* API passes and returns an integer */
 429 #define SYSCTL_BIT64(parent, nbr, name, access, ptr, val, bit, descr)   \
 430         SYSCTL_OID(parent, nbr, name,                                   \
 431                 CTLTYPE_BIT64(bit)|CTLFLAG_NOLOCK|(access),             \
 432                 ptr, val, sysctl_handle_bit64, "I", descr)
 433
 434 #define SYSCTL_ADD_BIT64(ctx, parent, nbr, name, access, ptr, val, bit, descr) \
 435         sysctl_add_oid(ctx, parent, nbr, name,                          \
 436             CTLTYPE_BIT64(bit)|CTLFLAG_NOLOCK|(access),                 \
 437             ptr, val, sysctl_handle_bit64, "I", descr)
 438
 439 /* Oid for an opaque object.  Specified by a pointer and a length. */
 440 #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr)  \
 441         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access),          \
 442                 ptr, len, sysctl_handle_opaque, fmt, descr)
 443
 444 #define SYSCTL_ADD_OPAQUE(ctx, parent, nbr, name, access, ptr, len, fmt, descr) \
 445         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \
 446         ptr, len, sysctl_handle_opaque, fmt, descr)
 447
 448 /* Oid for a struct.  Specified by a pointer and a type. */
 449 #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)      \
 450         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access),          \
 451                 ptr, sizeof(struct type), sysctl_handle_opaque,         \
 452                 "S," #type, descr)
 453
 454 #define SYSCTL_ADD_STRUCT(ctx, parent, nbr, name, access, ptr, type, descr) \
 455         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \
 456         ptr, sizeof(struct type), sysctl_handle_opaque, "S," #type, descr)
 457
 458 /* Oid for a procedure.  Specified by a pointer and an arg. */
 459 #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
 460         SYSCTL_OID(parent, nbr, name, (access),                         \
 461                 ptr, arg, handler, fmt, descr)
 462
 463 #define SYSCTL_ADD_PROC(ctx, parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
 464         sysctl_add_oid(ctx, parent, nbr, name, (access),                \
 465         ptr, arg, handler, fmt, descr)
 466
 467 #endif /* _KERNEL */
 468
 469 /*
 470  * Top-level identifiers
 471  */
 472 #define CTL_SYSCTL      0               /* "magic" numbers */
 473 #define CTL_KERN        1               /* "high kernel": proc, limits */
 474 #define CTL_VM          2               /* virtual memory */
 475 #define CTL_VFS         3               /* file system, mount type is next */
 476 #define CTL_NET         4               /* network, see socket.h */
 477 #define CTL_DEBUG       5               /* debugging parameters */
 478 #define CTL_HW          6               /* generic cpu/io */
 479 #define CTL_MACHDEP     7               /* machine dependent */
 480 #define CTL_USER        8               /* user-level */
 481 #define CTL_P1003_1B    9               /* POSIX 1003.1B */
 482 #define CTL_LWKT        10              /* light weight kernel threads */
 483 #define CTL_MAXID       11              /* number of valid top-level ids */
 484
 485 #define CTL_NAMES { \
 486         { 0, 0 }, \
 487         { "kern", CTLTYPE_NODE }, \
 488         { "vm", CTLTYPE_NODE }, \
 489         { "vfs", CTLTYPE_NODE }, \
 490         { "net", CTLTYPE_NODE }, \
 491         { "debug", CTLTYPE_NODE }, \
 492         { "hw", CTLTYPE_NODE }, \
 493         { "machdep", CTLTYPE_NODE }, \
 494         { "user", CTLTYPE_NODE }, \
 495         { "p1003_1b", CTLTYPE_NODE }, \
 496         { "lwkt", CTLTYPE_NODE }, \
 497 }
 498
 499 /*
 500  * CTL_SYSCTL identifiers
 501  */
 502 #define CTL_SYSCTL_DEBUG        0       /* printf all nodes */
 503 #define CTL_SYSCTL_NAME         1       /* string name of OID */
 504 #define CTL_SYSCTL_NEXT         2       /* next OID */
 505 #define CTL_SYSCTL_NAME2OID     3       /* int array of name */
 506 #define CTL_SYSCTL_OIDFMT       4       /* OID's kind and format */
 507 #define CTL_SYSCTL_OIDDESCR     5       /* OID's description */
 508
 509 /*
 510  * CTL_KERN identifiers
 511  */
 512 #define KERN_OSTYPE              1      /* string: system version */
 513 #define KERN_OSRELEASE           2      /* string: system release */
 514 #define KERN_OSREV               3      /* int: system revision */
 515 #define KERN_VERSION             4      /* string: compile time info */
 516 #define KERN_MAXVNODES           5      /* int: max vnodes */
 517 #define KERN_MAXPROC             6      /* int: max processes */
 518 #define KERN_MAXFILES            7      /* int: max open files */
 519 #define KERN_ARGMAX              8      /* int: max arguments to exec */
 520 #define KERN_SECURELVL           9      /* int: system security level */
 521 #define KERN_HOSTNAME           10      /* string: hostname */
 522 #define KERN_HOSTID             11      /* int: host identifier */
 523 #define KERN_CLOCKRATE          12      /* struct: struct clockrate */
 524 #define KERN_VNODE              13      /* struct: vnode structures */
 525 #define KERN_PROC               14      /* struct: process entries */
 526 #define KERN_FILE               15      /* struct: file entries */
 527 #define KERN_UNUSED16           16      /* was: node: kernel profiling info */
 528 #define KERN_POSIX1             17      /* int: POSIX.1 version */
 529 #define KERN_NGROUPS            18      /* int: # of supplemental group ids */
 530 #define KERN_JOB_CONTROL        19      /* int: is job control available */
 531 #define KERN_SAVED_IDS          20      /* int: saved set-user/group-ID */
 532 #define KERN_BOOTTIME           21      /* struct: time kernel was booted */
 533 #define KERN_NISDOMAINNAME      22      /* string: YP domain name */
 534 #define KERN_UPDATEINTERVAL     23      /* int: update process sleep time */
 535 #define KERN_OSRELDATE          24      /* int: OS release date */
 536 #define KERN_NTP_PLL            25      /* node: NTP PLL control */
 537 #define KERN_BOOTFILE           26      /* string: name of booted kernel */
 538 #define KERN_MAXFILESPERPROC    27      /* int: max open files per proc */
 539 #define KERN_MAXPROCPERUID      28      /* int: max processes per uid */
 540 #define KERN_DUMPDEV            29      /* dev_t: device to dump on */
 541 #define KERN_IPC                30      /* node: anything related to IPC */
 542 #define KERN_DUMMY              31      /* unused */
 543 #define KERN_PS_STRINGS         32      /* int: address of PS_STRINGS */
 544 #define KERN_USRSTACK           33      /* int: address of USRSTACK */
 545 #define KERN_LOGSIGEXIT         34      /* int: do we log sigexit procs? */
 546 #define KERN_IOV_MAX            35      /* int: value of UIO_MAXIOV */
 547 #define KERN_MAXPOSIXLOCKSPERUID 36     /* int: max POSIX locks per uid */
 548 #define KERN_STATIC_TLS_EXTRA   37      /* int: extra tls space for rtld */
 549 #define KERN_MAXID              38      /* number of valid kern ids */
 550
 551 #define CTL_KERN_NAMES { \
 552         { 0, 0 }, \
 553         { "ostype", CTLTYPE_STRING }, \
 554         { "osrelease", CTLTYPE_STRING }, \
 555         { "osrevision", CTLTYPE_INT }, \
 556         { "version", CTLTYPE_STRING }, \
 557         { "maxvnodes", CTLTYPE_INT }, \
 558         { "maxproc", CTLTYPE_INT }, \
 559         { "maxfiles", CTLTYPE_INT }, \
 560         { "argmax", CTLTYPE_INT }, \
 561         { "securelevel", CTLTYPE_INT }, \
 562         { "hostname", CTLTYPE_STRING }, \
 563         { "hostid", CTLTYPE_UINT }, \
 564         { "clockrate", CTLTYPE_STRUCT }, \
 565         { "vnode", CTLTYPE_STRUCT }, \
 566         { "proc", CTLTYPE_STRUCT }, \
 567         { "file", CTLTYPE_STRUCT }, \
 568         { "profiling", CTLTYPE_NODE }, \
 569         { "posix1version", CTLTYPE_INT }, \
 570         { "ngroups", CTLTYPE_INT }, \
 571         { "job_control", CTLTYPE_INT }, \
 572         { "saved_ids", CTLTYPE_INT }, \
 573         { "boottime", CTLTYPE_STRUCT }, \
 574         { "nisdomainname", CTLTYPE_STRING }, \
 575         { "update", CTLTYPE_INT }, \
 576         { "osreldate", CTLTYPE_INT }, \
 577         { "ntp_pll", CTLTYPE_NODE }, \
 578         { "bootfile", CTLTYPE_STRING }, \
 579         { "maxfilesperproc", CTLTYPE_INT }, \
 580         { "maxprocperuid", CTLTYPE_INT }, \
 581         { "dumpdev", CTLTYPE_STRUCT }, /* we lie; don't print as int */ \
 582         { "ipc", CTLTYPE_NODE }, \
 583         { "dummy", CTLTYPE_INT }, \
 584         { "ps_strings", CTLTYPE_INT }, \
 585         { "usrstack", CTLTYPE_INT }, \
 586         { "logsigexit", CTLTYPE_INT }, \
 587         { "iov_max", CTLTYPE_INT }, \
 588         { "maxposixlocksperuid", CTLTYPE_INT }, \
 589 }
 590
 591 /*
 592  * CTL_VFS identifiers
 593  */
 594 #define CTL_VFS_NAMES { \
 595         { "vfsconf", CTLTYPE_STRUCT }, \
 596 }
 597
 598 /*
 599  * KERN_PROC subtypes
 600  */
 601 #define KERN_PROC_ALL           0       /* everything */
 602 #define KERN_PROC_PID           1       /* by process id */
 603 #define KERN_PROC_PGRP          2       /* by process group id */
 604 #define KERN_PROC_SESSION       3       /* by session of pid */
 605 #define KERN_PROC_TTY           4       /* by controlling tty */
 606 #define KERN_PROC_UID           5       /* by effective uid */
 607 #define KERN_PROC_RUID          6       /* by real uid */
 608 #define KERN_PROC_ARGS          7       /* get/set arguments/proctitle */
 609 #define KERN_PROC_CWD           8       /* get cwd */
 610 #define KERN_PROC_PATHNAME      9       /* path to executable */
 611 #define KERN_PROC_SIGTRAMP      10      /* addr[2]: sigtramp addr range */
 612
 613 #define KERN_PROC_FLAGMASK      0xF0
 614 #define KERN_PROC_FLAG_LWP      0x10
 615 #define KERN_PROC_FLAG_LWKT     0x20
 616
 617 /*
 618  * KERN_IPC identifiers
 619  */
 620 #define KIPC_MAXSOCKBUF         1       /* int: max size of a socket buffer */
 621 #define KIPC_SOCKBUF_WASTE      2       /* int: wastage factor in sockbuf */
 622 #define KIPC_SOMAXCONN          3       /* int: max length of connection q */
 623 #define KIPC_MAX_LINKHDR        4       /* int: max length of link header */
 624 #define KIPC_MAX_PROTOHDR       5       /* int: max length of network header */
 625 #define KIPC_MAX_HDR            6       /* int: max total length of headers */
 626 #define KIPC_MAX_DATALEN        7       /* int: max length of data? */
 627 #define KIPC_MBSTAT             8       /* struct: mbuf usage statistics */
 628 #define KIPC_NMBCLUSTERS        9       /* int: maximum mbuf clusters */
 629
 630 /*
 631  * CTL_HW identifiers
 632  */
 633 #define HW_MACHINE       1              /* string: machine class */
 634 #define HW_MODEL         2              /* string: specific machine model */
 635 #define HW_NCPU          3              /* int: number of cpus */
 636 #define HW_BYTEORDER     4              /* int: machine byte order */
 637 #define HW_PHYSMEM       5              /* int: total memory */
 638 #define HW_USERMEM       6              /* int: non-kernel memory */
 639 #define HW_PAGESIZE      7              /* int: software page size */
 640 #define HW_DISKNAMES     8              /* strings: disk drive names */
 641 #define HW_DISKSTATS     9              /* struct: diskstats[] */
 642 #define HW_FLOATINGPT   10              /* int: has HW floating point? */
 643 #define HW_MACHINE_ARCH 11              /* string: machine architecture */
 644 #define HW_MACHINE_PLATFORM 12          /* string: platform architecture */
 645 #define HW_SENSORS      13              /* node: hardware sensors */
 646 #define HW_MAXID        14              /* number of valid hw ids */
 647
 648 /*
 649  * CTL_USER definitions
 650  */
 651 #define USER_CS_PATH             1      /* string: _CS_PATH */
 652 #define USER_BC_BASE_MAX         2      /* int: BC_BASE_MAX */
 653 #define USER_BC_DIM_MAX          3      /* int: BC_DIM_MAX */
 654 #define USER_BC_SCALE_MAX        4      /* int: BC_SCALE_MAX */
 655 #define USER_BC_STRING_MAX       5      /* int: BC_STRING_MAX */
 656 #define USER_COLL_WEIGHTS_MAX    6      /* int: COLL_WEIGHTS_MAX */
 657 #define USER_EXPR_NEST_MAX       7      /* int: EXPR_NEST_MAX */
 658 #define USER_LINE_MAX            8      /* int: LINE_MAX */
 659 #define USER_RE_DUP_MAX          9      /* int: RE_DUP_MAX */
 660 #define USER_POSIX2_VERSION     10      /* int: _POSIX2_VERSION */
 661 #define USER_POSIX2_C_BIND      11      /* int: _POSIX2_C_BIND */
 662 #define USER_POSIX2_C_DEV       12      /* int: _POSIX2_C_DEV */
 663 #define USER_POSIX2_CHAR_TERM   13      /* int: _POSIX2_CHAR_TERM */
 664 #define USER_POSIX2_FORT_DEV    14      /* int: _POSIX2_FORT_DEV */
 665 #define USER_POSIX2_FORT_RUN    15      /* int: _POSIX2_FORT_RUN */
 666 #define USER_POSIX2_LOCALEDEF   16      /* int: _POSIX2_LOCALEDEF */
 667 #define USER_POSIX2_SW_DEV      17      /* int: _POSIX2_SW_DEV */
 668 #define USER_POSIX2_UPE         18      /* int: _POSIX2_UPE */
 669 #define USER_STREAM_MAX         19      /* int: _POSIX2_STREAM_MAX */
 670 #define USER_TZNAME_MAX         20      /* int: _POSIX2_TZNAME_MAX */
 671 #define USER_MAXID              21      /* number of valid user ids */
 672
 673 #define CTL_USER_NAMES { \
 674         { 0, 0 }, \
 675         { "cs_path", CTLTYPE_STRING }, \
 676         { "bc_base_max", CTLTYPE_INT }, \
 677         { "bc_dim_max", CTLTYPE_INT }, \
 678         { "bc_scale_max", CTLTYPE_INT }, \
 679         { "bc_string_max", CTLTYPE_INT }, \
 680         { "coll_weights_max", CTLTYPE_INT }, \
 681         { "expr_nest_max", CTLTYPE_INT }, \
 682         { "line_max", CTLTYPE_INT }, \
 683         { "re_dup_max", CTLTYPE_INT }, \
 684         { "posix2_version", CTLTYPE_INT }, \
 685         { "posix2_c_bind", CTLTYPE_INT }, \
 686         { "posix2_c_dev", CTLTYPE_INT }, \
 687         { "posix2_char_term", CTLTYPE_INT }, \
 688         { "posix2_fort_dev", CTLTYPE_INT }, \
 689         { "posix2_fort_run", CTLTYPE_INT }, \
 690         { "posix2_localedef", CTLTYPE_INT }, \
 691         { "posix2_sw_dev", CTLTYPE_INT }, \
 692         { "posix2_upe", CTLTYPE_INT }, \
 693         { "stream_max", CTLTYPE_INT }, \
 694         { "tzname_max", CTLTYPE_INT }, \
 695 }
 696
 697 #define CTL_P1003_1B_ASYNCHRONOUS_IO            1       /* boolean */
 698 #define CTL_P1003_1B_MAPPED_FILES               2       /* boolean */
 699 #define CTL_P1003_1B_MEMLOCK                    3       /* boolean */
 700 #define CTL_P1003_1B_MEMLOCK_RANGE              4       /* boolean */
 701 #define CTL_P1003_1B_MEMORY_PROTECTION          5       /* boolean */
 702 #define CTL_P1003_1B_MESSAGE_PASSING            6       /* boolean */
 703 #define CTL_P1003_1B_PRIORITIZED_IO             7       /* boolean */
 704 #define CTL_P1003_1B_PRIORITY_SCHEDULING        8       /* boolean */
 705 #define CTL_P1003_1B_REALTIME_SIGNALS           9       /* boolean */
 706 #define CTL_P1003_1B_SEMAPHORES                 10      /* boolean */
 707 #define CTL_P1003_1B_FSYNC                      11      /* boolean */
 708 #define CTL_P1003_1B_SHARED_MEMORY_OBJECTS      12      /* boolean */
 709 #define CTL_P1003_1B_SYNCHRONIZED_IO            13      /* boolean */
 710 #define CTL_P1003_1B_TIMERS                     14      /* boolean */
 711 #define CTL_P1003_1B_AIO_LISTIO_MAX             15      /* int */
 712 #define CTL_P1003_1B_AIO_MAX                    16      /* int */
 713 #define CTL_P1003_1B_AIO_PRIO_DELTA_MAX         17      /* int */
 714 #define CTL_P1003_1B_DELAYTIMER_MAX             18      /* int */
 715 #define CTL_P1003_1B_UNUSED19                   19      /* int */
 716 #define CTL_P1003_1B_PAGESIZE                   20      /* int */
 717 #define CTL_P1003_1B_RTSIG_MAX                  21      /* int */
 718 #define CTL_P1003_1B_SEM_NSEMS_MAX              22      /* int */
 719 #define CTL_P1003_1B_UNUSED23                   23      /* int */
 720 #define CTL_P1003_1B_SIGQUEUE_MAX               24      /* int */
 721 #define CTL_P1003_1B_TIMER_MAX                  25      /* int */
 722
 723 #define CTL_P1003_1B_MAXID              26
 724
 725 #define CTL_P1003_1B_NAMES { \
 726         { 0, 0 }, \
 727         { "asynchronous_io", CTLTYPE_INT }, \
 728         { "mapped_files", CTLTYPE_INT }, \
 729         { "memlock", CTLTYPE_INT }, \
 730         { "memlock_range", CTLTYPE_INT }, \
 731         { "memory_protection", CTLTYPE_INT }, \
 732         { "message_passing", CTLTYPE_INT }, \
 733         { "prioritized_io", CTLTYPE_INT }, \
 734         { "priority_scheduling", CTLTYPE_INT }, \
 735         { "realtime_signals", CTLTYPE_INT }, \
 736         { "semaphores", CTLTYPE_INT }, \
 737         { "fsync", CTLTYPE_INT }, \
 738         { "shared_memory_objects", CTLTYPE_INT }, \
 739         { "synchronized_io", CTLTYPE_INT }, \
 740         { "timers", CTLTYPE_INT }, \
 741         { "aio_listio_max", CTLTYPE_INT }, \
 742         { "aio_max", CTLTYPE_INT }, \
 743         { "aio_prio_delta_max", CTLTYPE_INT }, \
 744         { "delaytimer_max", CTLTYPE_INT }, \
 745         { "unused1", CTLTYPE_INT }, \
 746         { "pagesize", CTLTYPE_INT }, \
 747         { "rtsig_max", CTLTYPE_INT }, \
 748         { "nsems_max", CTLTYPE_INT }, \
 749         { "sem_value_max", CTLTYPE_INT }, \
 750         { "sigqueue_max", CTLTYPE_INT }, \
 751         { "timer_max", CTLTYPE_INT }, \
 752 }
 753
 754 #ifdef _KERNEL
 755
 756 /*
 757  * Declare some common oids.
 758  */
 759 extern struct sysctl_oid_list sysctl__children;
 760 SYSCTL_DECL(_kern);
 761 SYSCTL_DECL(_kern_features);
 762 SYSCTL_DECL(_sysctl);
 763 SYSCTL_DECL(_vm);
 764 SYSCTL_DECL(_vfs);
 765 SYSCTL_DECL(_net);
 766 SYSCTL_DECL(_debug);
 767 SYSCTL_DECL(_debug_sizeof);
 768 SYSCTL_DECL(_dev);
 769 SYSCTL_DECL(_hw);
 770 SYSCTL_DECL(_hw_bus);
 771 SYSCTL_DECL(_machdep);
 772 SYSCTL_DECL(_user);
 773 SYSCTL_DECL(_compat);
 774 SYSCTL_DECL(_lwkt);
 775 SYSCTL_DECL(_security);
 776
 777 /*
 778  * Common second-level oids.
 779  */
 780 SYSCTL_DECL(_kern_ipc);
 781
 782 extern char     machine[];
 783 extern char     osrelease[];
 784 extern char     ostype[];
 785 extern char     kern_ident[];
 786
 787 /* Dynamic oid handling */
 788 struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist,
 789                 struct sysctl_oid_list *parent, int nbr, const char *name,
 790                 int kind, void *arg1, int arg2,
 791                 int (*handler) (SYSCTL_HANDLER_ARGS),
 792                 const char *fmt, const char *descr);
 793 void    sysctl_rename_oid(struct sysctl_oid *oidp, const char *name);
 794 int     sysctl_remove_name(struct sysctl_oid *parent, const char *name, int del,
 795             int recurse);
 796 int     sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse);
 797 int     sysctl_ctx_init(struct sysctl_ctx_list *clist);
 798 int     sysctl_ctx_free(struct sysctl_ctx_list *clist);
 799 struct  sysctl_ctx_entry *sysctl_ctx_entry_add(struct sysctl_ctx_list *clist,
 800                 struct sysctl_oid *oidp);
 801 struct  sysctl_ctx_entry *sysctl_ctx_entry_find(struct sysctl_ctx_list *clist,
 802                 struct sysctl_oid *oidp);
 803 int     sysctl_ctx_entry_del(struct sysctl_ctx_list *clist,
 804                 struct sysctl_oid *oidp);
 805
 806 int     kernel_sysctl(int *name, u_int namelen, void *old,
 807                       size_t *oldlenp, void *new, size_t newlen,
 808                       size_t *retval);
 809 int     kernel_sysctlbyname(char *name,
 810                 void *old, size_t *oldlenp, void *new, size_t newlen,
 811                 size_t *retval);
 812 int     userland_sysctl(int *name, u_int namelen, void *old,
 813             size_t *oldlenp, int inkernel, void *new, size_t newlen,
 814             size_t *retval);
 815 int     sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
 816                         int *nindx, struct sysctl_req *req);
 817
 818 int     sysctl_int_range(SYSCTL_HANDLER_ARGS, int low, int high);
 819 void    _sysctl_xlock(void);
 820 void    _sysctl_xunlock(void);
 821
 822 struct sbuf;
 823 struct sbuf *sbuf_new_for_sysctl(struct sbuf *, char *, int,
 824             struct sysctl_req *);
 825
 826 /*
 827  * A macro to generate a read-only sysctl to indicate the presence of optional
 828  * kernel features.
 829  */
 830 #define FEATURE(name, desc)                                             \
 831         SYSCTL_INT(_kern_features, OID_AUTO, name,              \
 832             CTLFLAG_RD, NULL, 1, desc)
 833
 834 #endif  /* _KERNEL */
 835
 836 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
 837
 838 #include <sys/cdefs.h>
 839
 840 __BEGIN_DECLS
 841 int     sysctl(const int *, u_int, void *, size_t *, const void *, size_t);
 842 int     sysctlbyname(const char *, void *, size_t *, const void *, size_t);
 843 int     sysctlnametomib (const char *, int *, size_t *);
 844 __END_DECLS
 845
 846 #endif  /* _KERNEL && _KERNEL_VIRTUAL */
 847
 848 #endif  /* !_SYS_SYSCTL_H_ */