The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/sysctl.h

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    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  * 4. 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: releng/10.2/sys/sys/sysctl.h 273736 2014-10-27 14:38:00Z hselasky $
   34  */
   35 
   36 #ifndef _SYS_SYSCTL_H_
   37 #define _SYS_SYSCTL_H_
   38 
   39 #include <sys/queue.h>
   40 
   41 struct thread;
   42 /*
   43  * Definitions for sysctl call.  The sysctl call uses a hierarchical name
   44  * for objects that can be examined or modified.  The name is expressed as
   45  * a sequence of integers.  Like a file path name, the meaning of each
   46  * component depends on its place in the hierarchy.  The top-level and kern
   47  * identifiers are defined here, and other identifiers are defined in the
   48  * respective subsystem header files.
   49  */
   50 
   51 #define CTL_MAXNAME     24      /* largest number of components supported */
   52 
   53 /*
   54  * Each subsystem defined by sysctl defines a list of variables
   55  * for that subsystem. Each name is either a node with further
   56  * levels defined below it, or it is a leaf of some particular
   57  * type given below. Each sysctl level defines a set of name/type
   58  * pairs to be used by sysctl(8) in manipulating the subsystem.
   59  */
   60 struct ctlname {
   61         char    *ctl_name;      /* subsystem name */
   62         int      ctl_type;      /* type of name */
   63 };
   64 
   65 #define CTLTYPE         0xf     /* mask for the type */
   66 #define CTLTYPE_NODE    1       /* name is a node */
   67 #define CTLTYPE_INT     2       /* name describes an integer */
   68 #define CTLTYPE_STRING  3       /* name describes a string */
   69 #define CTLTYPE_S64     4       /* name describes a signed 64-bit number */
   70 #define CTLTYPE_OPAQUE  5       /* name describes a structure */
   71 #define CTLTYPE_STRUCT  CTLTYPE_OPAQUE  /* name describes a structure */
   72 #define CTLTYPE_UINT    6       /* name describes an unsigned integer */
   73 #define CTLTYPE_LONG    7       /* name describes a long */
   74 #define CTLTYPE_ULONG   8       /* name describes an unsigned long */
   75 #define CTLTYPE_U64     9       /* name describes an unsigned 64-bit number */
   76 
   77 #define CTLFLAG_RD      0x80000000      /* Allow reads of variable */
   78 #define CTLFLAG_WR      0x40000000      /* Allow writes to the variable */
   79 #define CTLFLAG_RW      (CTLFLAG_RD|CTLFLAG_WR)
   80 #define CTLFLAG_ANYBODY 0x10000000      /* All users can set this var */
   81 #define CTLFLAG_SECURE  0x08000000      /* Permit set only if securelevel<=0 */
   82 #define CTLFLAG_PRISON  0x04000000      /* Prisoned roots can fiddle */
   83 #define CTLFLAG_DYN     0x02000000      /* Dynamic oid - can be freed */
   84 #define CTLFLAG_SKIP    0x01000000      /* Skip this sysctl when listing */
   85 #define CTLMASK_SECURE  0x00F00000      /* Secure level */
   86 #define CTLFLAG_TUN     0x00080000      /* Tunable variable */
   87 #define CTLFLAG_RDTUN   (CTLFLAG_RD|CTLFLAG_TUN)
   88 #define CTLFLAG_RWTUN   (CTLFLAG_RW|CTLFLAG_TUN)
   89 #define CTLFLAG_MPSAFE  0x00040000      /* Handler is MP safe */
   90 #define CTLFLAG_VNET    0x00020000      /* Prisons with vnet can fiddle */
   91 #define CTLFLAG_DYING   0x00010000      /* Oid is being removed */
   92 #define CTLFLAG_CAPRD   0x00008000      /* Can be read in capability mode */
   93 #define CTLFLAG_CAPWR   0x00004000      /* Can be written in capability mode */
   94 #define CTLFLAG_STATS   0x00002000      /* Statistics, not a tuneable */
   95 #define CTLFLAG_NOFETCH 0x00001000      /* Don't fetch tunable from getenv() */
   96 #define CTLFLAG_CAPRW   (CTLFLAG_CAPRD|CTLFLAG_CAPWR)
   97 
   98 /*
   99  * Secure level.   Note that CTLFLAG_SECURE == CTLFLAG_SECURE1.
  100  *
  101  * Secure when the securelevel is raised to at least N.
  102  */
  103 #define CTLSHIFT_SECURE 20
  104 #define CTLFLAG_SECURE1 (CTLFLAG_SECURE | (0 << CTLSHIFT_SECURE))
  105 #define CTLFLAG_SECURE2 (CTLFLAG_SECURE | (1 << CTLSHIFT_SECURE))
  106 #define CTLFLAG_SECURE3 (CTLFLAG_SECURE | (2 << CTLSHIFT_SECURE))
  107 
  108 /*
  109  * USE THIS instead of a hardwired number from the categories below
  110  * to get dynamically assigned sysctl entries using the linker-set
  111  * technology. This is the way nearly all new sysctl variables should
  112  * be implemented.
  113  * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
  114  */
  115 #define OID_AUTO        (-1)
  116 
  117 /*
  118  * The starting number for dynamically-assigned entries.  WARNING!
  119  * ALL static sysctl entries should have numbers LESS than this!
  120  */
  121 #define CTL_AUTO_START  0x100
  122 
  123 #ifdef _KERNEL
  124 #include <sys/linker_set.h>
  125 
  126 #ifdef KLD_MODULE
  127 /* XXX allow overspecification of type in external kernel modules */
  128 #define SYSCTL_CT_ASSERT_MASK CTLTYPE
  129 #else
  130 #define SYSCTL_CT_ASSERT_MASK 0
  131 #endif
  132 
  133 #define SYSCTL_HANDLER_ARGS struct sysctl_oid *oidp, void *arg1,        \
  134         intptr_t arg2, struct sysctl_req *req
  135 
  136 /* definitions for sysctl_req 'lock' member */
  137 #define REQ_UNWIRED     1
  138 #define REQ_WIRED       2
  139 
  140 /* definitions for sysctl_req 'flags' member */
  141 #if defined(__amd64__) || defined(__ia64__) || defined(__powerpc64__) ||\
  142     (defined(__mips__) && defined(__mips_n64))
  143 #define SCTL_MASK32     1       /* 32 bit emulation */
  144 #endif
  145 
  146 /*
  147  * This describes the access space for a sysctl request.  This is needed
  148  * so that we can use the interface from the kernel or from user-space.
  149  */
  150 struct sysctl_req {
  151         struct thread   *td;            /* used for access checking */
  152         int              lock;          /* wiring state */
  153         void            *oldptr;
  154         size_t           oldlen;
  155         size_t           oldidx;
  156         int             (*oldfunc)(struct sysctl_req *, const void *, size_t);
  157         void            *newptr;
  158         size_t           newlen;
  159         size_t           newidx;
  160         int             (*newfunc)(struct sysctl_req *, void *, size_t);
  161         size_t           validlen;
  162         int              flags;
  163 };
  164 
  165 SLIST_HEAD(sysctl_oid_list, sysctl_oid);
  166 
  167 /*
  168  * This describes one "oid" in the MIB tree.  Potentially more nodes can
  169  * be hidden behind it, expanded by the handler.
  170  */
  171 struct sysctl_oid {
  172         struct sysctl_oid_list *oid_parent;
  173         SLIST_ENTRY(sysctl_oid) oid_link;
  174         int              oid_number;
  175         u_int            oid_kind;
  176         void            *oid_arg1;
  177         intptr_t         oid_arg2;
  178         const char      *oid_name;
  179         int             (*oid_handler)(SYSCTL_HANDLER_ARGS);
  180         const char      *oid_fmt;
  181         int              oid_refcnt;
  182         u_int            oid_running;
  183         const char      *oid_descr;
  184 };
  185 
  186 #define SYSCTL_IN(r, p, l)      (r->newfunc)(r, p, l)
  187 #define SYSCTL_OUT(r, p, l)     (r->oldfunc)(r, p, l)
  188 
  189 int sysctl_handle_int(SYSCTL_HANDLER_ARGS);
  190 int sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS);
  191 int sysctl_handle_long(SYSCTL_HANDLER_ARGS);
  192 int sysctl_handle_64(SYSCTL_HANDLER_ARGS);
  193 int sysctl_handle_string(SYSCTL_HANDLER_ARGS);
  194 int sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
  195 int sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS);
  196 
  197 int sysctl_handle_uma_zone_max(SYSCTL_HANDLER_ARGS);
  198 int sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS);
  199 
  200 int sysctl_dpcpu_int(SYSCTL_HANDLER_ARGS);
  201 int sysctl_dpcpu_long(SYSCTL_HANDLER_ARGS);
  202 int sysctl_dpcpu_quad(SYSCTL_HANDLER_ARGS);
  203 
  204 /*
  205  * These functions are used to add/remove an oid from the mib.
  206  */
  207 void sysctl_register_oid(struct sysctl_oid *oidp);
  208 void sysctl_unregister_oid(struct sysctl_oid *oidp);
  209 
  210 /* Declare a static oid to allow child oids to be added to it. */
  211 #define SYSCTL_DECL(name)                                               \
  212         extern struct sysctl_oid_list sysctl_##name##_children
  213 
  214 /* Hide these in macros. */
  215 #define SYSCTL_CHILDREN(oid_ptr)                                        \
  216         (struct sysctl_oid_list *)(oid_ptr)->oid_arg1
  217 #define SYSCTL_PARENT(oid_ptr)                  NULL    /* not supported */
  218 #define SYSCTL_CHILDREN_SET(oid_ptr, val)       (oid_ptr)->oid_arg1 = (val)
  219 #define SYSCTL_STATIC_CHILDREN(oid_name)        (&sysctl_##oid_name##_children)
  220 
  221 /* === Structs and macros related to context handling. === */
  222 
  223 /* All dynamically created sysctls can be tracked in a context list. */
  224 struct sysctl_ctx_entry {
  225         struct sysctl_oid *entry;
  226         TAILQ_ENTRY(sysctl_ctx_entry) link;
  227 };
  228 
  229 TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
  230 
  231 #define SYSCTL_NODE_CHILDREN(parent, name) \
  232         sysctl_##parent##_##name##_children
  233 
  234 #ifndef NO_SYSCTL_DESCR
  235 #define __DESCR(d) d
  236 #else
  237 #define __DESCR(d) ""
  238 #endif
  239 
  240 /* This constructs a "raw" MIB oid. */
  241 #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr)\
  242         static struct sysctl_oid sysctl__##parent##_##name = {          \
  243                 &sysctl_##parent##_children,                            \
  244                 { NULL },                                               \
  245                 nbr,                                                    \
  246                 kind,                                                   \
  247                 a1,                                                     \
  248                 a2,                                                     \
  249                 #name,                                                  \
  250                 handler,                                                \
  251                 fmt,                                                    \
  252                 0,                                                      \
  253                 0,                                                      \
  254                 __DESCR(descr)                                          \
  255                 };                                                      \
  256         DATA_SET(sysctl_set, sysctl__##parent##_##name)
  257 
  258 #define SYSCTL_ADD_OID(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
  259         sysctl_add_oid(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, __DESCR(descr))
  260 
  261 /* This constructs a root node from which other nodes can hang. */
  262 #define SYSCTL_ROOT_NODE(nbr, name, access, handler, descr)             \
  263         SYSCTL_NODE(, nbr, name, access, handler, descr);               \
  264         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  265             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_NODE)
  266 
  267 /* This constructs a node from which other oids can hang. */
  268 #define SYSCTL_NODE(parent, nbr, name, access, handler, descr)              \
  269         struct sysctl_oid_list SYSCTL_NODE_CHILDREN(parent, name);          \
  270         SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|(access),                \
  271             (void*)&SYSCTL_NODE_CHILDREN(parent, name), 0, handler, "N", descr); \
  272         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  273             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_NODE)
  274 
  275 #define SYSCTL_ADD_ROOT_NODE(ctx, nbr, name, access, handler, descr) \
  276         SYSCTL_ADD_NODE(ctx, SYSCTL_STATIC_CHILDREN(), nbr, name, access, handler, descr)
  277 
  278 #define SYSCTL_ADD_NODE(ctx, parent, nbr, name, access, handler, descr) \
  279 ({                                                                      \
  280         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  281             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_NODE);        \
  282         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|(access),   \
  283             NULL, 0, handler, "N", __DESCR(descr));                     \
  284 })
  285 
  286 /* Oid for a string.  len can be 0 to indicate '\0' termination. */
  287 #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)       \
  288         SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access),          \
  289             arg, len, sysctl_handle_string, "A", descr);                \
  290         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  291             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_STRING)
  292 
  293 #define SYSCTL_ADD_STRING(ctx, parent, nbr, name, access, arg, len, descr) \
  294 ({                                                                      \
  295         char *__arg = (arg);                                            \
  296         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  297             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_STRING);      \
  298         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_STRING|(access), \
  299             __arg, len, sysctl_handle_string, "A", __DESCR(descr));     \
  300 })
  301 
  302 /* Oid for an int.  If ptr is SYSCTL_NULL_INT_PTR, val is returned. */
  303 #define SYSCTL_NULL_INT_PTR ((int *)NULL)
  304 #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)  \
  305         SYSCTL_OID(parent, nbr, name,                           \
  306             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),            \
  307             ptr, val, sysctl_handle_int, "I", descr);           \
  308         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  309             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT); \
  310         CTASSERT(sizeof(int) == sizeof(*(ptr)))
  311 
  312 #define SYSCTL_ADD_INT(ctx, parent, nbr, name, access, ptr, val, descr) \
  313 ({                                                                      \
  314         int *__ptr = (ptr);                                             \
  315         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  316             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT);         \
  317         sysctl_add_oid(ctx, parent, nbr, name,                          \
  318             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),                    \
  319             __ptr, val, sysctl_handle_int, "I", __DESCR(descr));        \
  320 })
  321 
  322 /* Oid for an unsigned int.  If ptr is NULL, val is returned. */
  323 #define SYSCTL_NULL_UINT_PTR ((unsigned *)NULL)
  324 #define SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr) \
  325         SYSCTL_OID(parent, nbr, name,                           \
  326             CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),           \
  327             ptr, val, sysctl_handle_int, "IU", descr);          \
  328         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  329             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_UINT);\
  330         CTASSERT(sizeof(unsigned) == sizeof(*(ptr)))
  331 
  332 #define SYSCTL_ADD_UINT(ctx, parent, nbr, name, access, ptr, val, descr) \
  333 ({                                                                      \
  334         unsigned *__ptr = (ptr);                                        \
  335         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  336             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_UINT);        \
  337         sysctl_add_oid(ctx, parent, nbr, name,                          \
  338             CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),                   \
  339             __ptr, val, sysctl_handle_int, "IU", __DESCR(descr));       \
  340 })
  341 
  342 /* Oid for a long.  The pointer must be non NULL. */
  343 #define SYSCTL_NULL_LONG_PTR ((long *)NULL)
  344 #define SYSCTL_LONG(parent, nbr, name, access, ptr, val, descr) \
  345         SYSCTL_OID(parent, nbr, name,                           \
  346             CTLTYPE_LONG | CTLFLAG_MPSAFE | (access),           \
  347             ptr, val, sysctl_handle_long, "L", descr);          \
  348         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  349             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_LONG);\
  350         CTASSERT(sizeof(long) == sizeof(*(ptr)))
  351 
  352 #define SYSCTL_ADD_LONG(ctx, parent, nbr, name, access, ptr, descr)     \
  353 ({                                                                      \
  354         long *__ptr = (ptr);                                            \
  355         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  356             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_LONG);        \
  357         sysctl_add_oid(ctx, parent, nbr, name,                          \
  358             CTLTYPE_LONG | CTLFLAG_MPSAFE | (access),                   \
  359             __ptr, 0, sysctl_handle_long, "L", __DESCR(descr));         \
  360 })
  361 
  362 /* Oid for an unsigned long.  The pointer must be non NULL. */
  363 #define SYSCTL_NULL_ULONG_PTR ((unsigned long *)NULL)
  364 #define SYSCTL_ULONG(parent, nbr, name, access, ptr, val, descr)        \
  365         SYSCTL_OID(parent, nbr, name,                                   \
  366             CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access),                  \
  367             ptr, val, sysctl_handle_long, "LU", descr);                 \
  368         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  369             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_ULONG);       \
  370         CTASSERT(sizeof(unsigned long) == sizeof(*(ptr)))
  371 
  372 #define SYSCTL_ADD_ULONG(ctx, parent, nbr, name, access, ptr, descr)    \
  373 ({                                                                      \
  374         unsigned long *__ptr = (ptr);                                   \
  375         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  376             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_ULONG);       \
  377         sysctl_add_oid(ctx, parent, nbr, name,                          \
  378             CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access),                  \
  379             __ptr, 0, sysctl_handle_long, "LU", __DESCR(descr));        \
  380 })
  381 
  382 /* Oid for a quad.  The pointer must be non NULL. */
  383 #define SYSCTL_NULL_QUAD_PTR ((int64_t *)NULL)
  384 #define SYSCTL_QUAD(parent, nbr, name, access, ptr, val, descr) \
  385         SYSCTL_OID(parent, nbr, name,                           \
  386             CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),            \
  387             ptr, val, sysctl_handle_64, "Q", descr);            \
  388         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  389             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64); \
  390         CTASSERT(sizeof(int64_t) == sizeof(*(ptr)))
  391 
  392 #define SYSCTL_ADD_QUAD(ctx, parent, nbr, name, access, ptr, descr)     \
  393 ({                                                                      \
  394         int64_t *__ptr = (ptr);                                         \
  395         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  396             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64);         \
  397         sysctl_add_oid(ctx, parent, nbr, name,                          \
  398             CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),                    \
  399             __ptr, 0, sysctl_handle_64, "Q", __DESCR(descr));           \
  400 })
  401 
  402 #define SYSCTL_NULL_UQUAD_PTR ((uint64_t *)NULL)
  403 #define SYSCTL_UQUAD(parent, nbr, name, access, ptr, val, descr)        \
  404         SYSCTL_OID(parent, nbr, name,                                   \
  405             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  406              ptr, val, sysctl_handle_64, "QU", descr);                  \
  407         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  408             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64);         \
  409         CTASSERT(sizeof(uint64_t) == sizeof(*(ptr)))
  410 
  411 #define SYSCTL_ADD_UQUAD(ctx, parent, nbr, name, access, ptr, descr)    \
  412 ({                                                                      \
  413         uint64_t *__ptr = (ptr);                                        \
  414         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  415             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64);         \
  416         sysctl_add_oid(ctx, parent, nbr, name,                          \
  417             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  418             __ptr, 0, sysctl_handle_64, "QU", __DESCR(descr));          \
  419 })
  420 
  421 /* Oid for a CPU dependant variable */
  422 #define SYSCTL_ADD_UAUTO(ctx, parent, nbr, name, access, ptr, descr)    \
  423 ({                                                                      \
  424         struct sysctl_oid *__ret;                                       \
  425         CTASSERT(sizeof(uint64_t) == sizeof(*(ptr)) ||                  \
  426             sizeof(unsigned) == sizeof(*(ptr)));                        \
  427         CTASSERT(((access) & CTLTYPE) == 0);                            \
  428         if (sizeof(uint64_t) == sizeof(*(ptr))) {                       \
  429                 __ret = sysctl_add_oid(ctx, parent, nbr, name,          \
  430                     CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),            \
  431                     (ptr), 0, sysctl_handle_64, "QU",                   \
  432                     __DESCR(descr));                                    \
  433         } else {                                                        \
  434                 __ret = sysctl_add_oid(ctx, parent, nbr, name,          \
  435                     CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),           \
  436                     (ptr), 0, sysctl_handle_int, "IU",                  \
  437                     __DESCR(descr));                                    \
  438         }                                                               \
  439         __ret;                                                          \
  440 })
  441 
  442 /* Oid for a 64-bit unsigned counter(9).  The pointer must be non NULL. */
  443 #define SYSCTL_COUNTER_U64(parent, nbr, name, access, ptr, descr)       \
  444         SYSCTL_OID(parent, nbr, name,                                   \
  445             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  446             (ptr), 0, sysctl_handle_counter_u64, "QU", descr);          \
  447         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  448             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64);         \
  449         CTASSERT(sizeof(counter_u64_t) == sizeof(*(ptr)));              \
  450         CTASSERT(sizeof(uint64_t) == sizeof(**(ptr)))
  451 
  452 #define SYSCTL_ADD_COUNTER_U64(ctx, parent, nbr, name, access, ptr, descr) \
  453 ({                                                                      \
  454         counter_u64_t *__ptr = (ptr);                                   \
  455         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  456             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64);         \
  457         sysctl_add_oid(ctx, parent, nbr, name,                          \
  458             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  459             __ptr, 0, sysctl_handle_counter_u64, "QU", __DESCR(descr)); \
  460 })
  461 
  462 /* Oid for an opaque object.  Specified by a pointer and a length. */
  463 #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr)  \
  464         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access),          \
  465             ptr, len, sysctl_handle_opaque, fmt, descr);                \
  466         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  467             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE)
  468 
  469 #define SYSCTL_ADD_OPAQUE(ctx, parent, nbr, name, access, ptr, len, fmt, descr) \
  470 ({                                                                      \
  471         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  472             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE);      \
  473         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \
  474             ptr, len, sysctl_handle_opaque, fmt, __DESCR(descr));       \
  475 })
  476 
  477 /* Oid for a struct.  Specified by a pointer and a type. */
  478 #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)      \
  479         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access),          \
  480             ptr, sizeof(struct type), sysctl_handle_opaque,             \
  481             "S," #type, descr);                                         \
  482         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  483             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE)
  484 
  485 #define SYSCTL_ADD_STRUCT(ctx, parent, nbr, name, access, ptr, type, descr) \
  486 ({                                                                      \
  487         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  488             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE);      \
  489         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \
  490             (ptr), sizeof(struct type),                                 \
  491             sysctl_handle_opaque, "S," #type, __DESCR(descr));          \
  492 })
  493 
  494 /* Oid for a procedure.  Specified by a pointer and an arg. */
  495 #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
  496         SYSCTL_OID(parent, nbr, name, (access),                         \
  497             ptr, arg, handler, fmt, descr);                             \
  498         CTASSERT(((access) & CTLTYPE) != 0)
  499 
  500 #define SYSCTL_ADD_PROC(ctx, parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
  501 ({                                                                      \
  502         CTASSERT(((access) & CTLTYPE) != 0);                            \
  503         sysctl_add_oid(ctx, parent, nbr, name, (access),                \
  504             (ptr), (arg), (handler), (fmt), __DESCR(descr));            \
  505 })
  506 
  507 /* Oid to handle limits on uma(9) zone specified by pointer. */
  508 #define SYSCTL_UMA_MAX(parent, nbr, name, access, ptr, descr)   \
  509         SYSCTL_OID(parent, nbr, name,                           \
  510             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),            \
  511             (ptr), 0, sysctl_handle_uma_zone_max, "I", descr);  \
  512         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  513             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT)
  514 
  515 #define SYSCTL_ADD_UMA_MAX(ctx, parent, nbr, name, access, ptr, descr)  \
  516 ({                                                                      \
  517         uma_zone_t __ptr = (ptr);                                       \
  518         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  519             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT);         \
  520         sysctl_add_oid(ctx, parent, nbr, name,                          \
  521             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),                    \
  522             __ptr, 0, sysctl_handle_uma_zone_max, "I", __DESCR(descr)); \
  523 })
  524 
  525 /* Oid to obtain current use of uma(9) zone specified by pointer. */
  526 #define SYSCTL_UMA_CUR(parent, nbr, name, access, ptr, descr)           \
  527         SYSCTL_OID(parent, nbr, name,                                   \
  528             CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),       \
  529             (ptr), 0, sysctl_handle_uma_zone_cur, "I", descr);          \
  530         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  531             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT)
  532 
  533 #define SYSCTL_ADD_UMA_CUR(ctx, parent, nbr, name, access, ptr, descr)  \
  534 ({                                                                      \
  535         uma_zone_t __ptr = (ptr);                                       \
  536         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  537             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT);         \
  538         sysctl_add_oid(ctx, parent, nbr, name,                          \
  539             CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),       \
  540             __ptr, 0, sysctl_handle_uma_zone_cur, "I", __DESCR(descr)); \
  541 })
  542 
  543 /*
  544  * A macro to generate a read-only sysctl to indicate the presense of optional
  545  * kernel features.
  546  */
  547 #define FEATURE(name, desc)                                             \
  548         SYSCTL_INT(_kern_features, OID_AUTO, name, CTLFLAG_RD | CTLFLAG_CAPRD, \
  549             SYSCTL_NULL_INT_PTR, 1, desc)
  550 
  551 #endif /* _KERNEL */
  552 
  553 /*
  554  * Top-level identifiers
  555  */
  556 #define CTL_UNSPEC      0               /* unused */
  557 #define CTL_KERN        1               /* "high kernel": proc, limits */
  558 #define CTL_VM          2               /* virtual memory */
  559 #define CTL_VFS         3               /* filesystem, mount type is next */
  560 #define CTL_NET         4               /* network, see socket.h */
  561 #define CTL_DEBUG       5               /* debugging parameters */
  562 #define CTL_HW          6               /* generic cpu/io */
  563 #define CTL_MACHDEP     7               /* machine dependent */
  564 #define CTL_USER        8               /* user-level */
  565 #define CTL_P1003_1B    9               /* POSIX 1003.1B */
  566 #define CTL_MAXID       10              /* number of valid top-level ids */
  567 
  568 /*
  569  * CTL_KERN identifiers
  570  */
  571 #define KERN_OSTYPE              1      /* string: system version */
  572 #define KERN_OSRELEASE           2      /* string: system release */
  573 #define KERN_OSREV               3      /* int: system revision */
  574 #define KERN_VERSION             4      /* string: compile time info */
  575 #define KERN_MAXVNODES           5      /* int: max vnodes */
  576 #define KERN_MAXPROC             6      /* int: max processes */
  577 #define KERN_MAXFILES            7      /* int: max open files */
  578 #define KERN_ARGMAX              8      /* int: max arguments to exec */
  579 #define KERN_SECURELVL           9      /* int: system security level */
  580 #define KERN_HOSTNAME           10      /* string: hostname */
  581 #define KERN_HOSTID             11      /* int: host identifier */
  582 #define KERN_CLOCKRATE          12      /* struct: struct clockrate */
  583 #define KERN_VNODE              13      /* struct: vnode structures */
  584 #define KERN_PROC               14      /* struct: process entries */
  585 #define KERN_FILE               15      /* struct: file entries */
  586 #define KERN_PROF               16      /* node: kernel profiling info */
  587 #define KERN_POSIX1             17      /* int: POSIX.1 version */
  588 #define KERN_NGROUPS            18      /* int: # of supplemental group ids */
  589 #define KERN_JOB_CONTROL        19      /* int: is job control available */
  590 #define KERN_SAVED_IDS          20      /* int: saved set-user/group-ID */
  591 #define KERN_BOOTTIME           21      /* struct: time kernel was booted */
  592 #define KERN_NISDOMAINNAME      22      /* string: YP domain name */
  593 #define KERN_UPDATEINTERVAL     23      /* int: update process sleep time */
  594 #define KERN_OSRELDATE          24      /* int: kernel release date */
  595 #define KERN_NTP_PLL            25      /* node: NTP PLL control */
  596 #define KERN_BOOTFILE           26      /* string: name of booted kernel */
  597 #define KERN_MAXFILESPERPROC    27      /* int: max open files per proc */
  598 #define KERN_MAXPROCPERUID      28      /* int: max processes per uid */
  599 #define KERN_DUMPDEV            29      /* struct cdev *: device to dump on */
  600 #define KERN_IPC                30      /* node: anything related to IPC */
  601 #define KERN_DUMMY              31      /* unused */
  602 #define KERN_PS_STRINGS         32      /* int: address of PS_STRINGS */
  603 #define KERN_USRSTACK           33      /* int: address of USRSTACK */
  604 #define KERN_LOGSIGEXIT         34      /* int: do we log sigexit procs? */
  605 #define KERN_IOV_MAX            35      /* int: value of UIO_MAXIOV */
  606 #define KERN_HOSTUUID           36      /* string: host UUID identifier */
  607 #define KERN_ARND               37      /* int: from arc4rand() */
  608 #define KERN_MAXID              38      /* number of valid kern ids */
  609 /*
  610  * KERN_PROC subtypes
  611  */
  612 #define KERN_PROC_ALL           0       /* everything */
  613 #define KERN_PROC_PID           1       /* by process id */
  614 #define KERN_PROC_PGRP          2       /* by process group id */
  615 #define KERN_PROC_SESSION       3       /* by session of pid */
  616 #define KERN_PROC_TTY           4       /* by controlling tty */
  617 #define KERN_PROC_UID           5       /* by effective uid */
  618 #define KERN_PROC_RUID          6       /* by real uid */
  619 #define KERN_PROC_ARGS          7       /* get/set arguments/proctitle */
  620 #define KERN_PROC_PROC          8       /* only return procs */
  621 #define KERN_PROC_SV_NAME       9       /* get syscall vector name */
  622 #define KERN_PROC_RGID          10      /* by real group id */
  623 #define KERN_PROC_GID           11      /* by effective group id */
  624 #define KERN_PROC_PATHNAME      12      /* path to executable */
  625 #define KERN_PROC_OVMMAP        13      /* Old VM map entries for process */
  626 #define KERN_PROC_OFILEDESC     14      /* Old file descriptors for process */
  627 #define KERN_PROC_KSTACK        15      /* Kernel stacks for process */
  628 #define KERN_PROC_INC_THREAD    0x10    /*
  629                                          * modifier for pid, pgrp, tty,
  630                                          * uid, ruid, gid, rgid and proc
  631                                          * This effectively uses 16-31
  632                                          */
  633 #define KERN_PROC_VMMAP         32      /* VM map entries for process */
  634 #define KERN_PROC_FILEDESC      33      /* File descriptors for process */
  635 #define KERN_PROC_GROUPS        34      /* process groups */
  636 #define KERN_PROC_ENV           35      /* get environment */
  637 #define KERN_PROC_AUXV          36      /* get ELF auxiliary vector */
  638 #define KERN_PROC_RLIMIT        37      /* process resource limits */
  639 #define KERN_PROC_PS_STRINGS    38      /* get ps_strings location */
  640 #define KERN_PROC_UMASK         39      /* process umask */
  641 #define KERN_PROC_OSREL         40      /* osreldate for process binary */
  642 #define KERN_PROC_SIGTRAMP      41      /* signal trampoline location */
  643 
  644 /*
  645  * KERN_IPC identifiers
  646  */
  647 #define KIPC_MAXSOCKBUF         1       /* int: max size of a socket buffer */
  648 #define KIPC_SOCKBUF_WASTE      2       /* int: wastage factor in sockbuf */
  649 #define KIPC_SOMAXCONN          3       /* int: max length of connection q */
  650 #define KIPC_MAX_LINKHDR        4       /* int: max length of link header */
  651 #define KIPC_MAX_PROTOHDR       5       /* int: max length of network header */
  652 #define KIPC_MAX_HDR            6       /* int: max total length of headers */
  653 #define KIPC_MAX_DATALEN        7       /* int: max length of data? */
  654 
  655 /*
  656  * CTL_HW identifiers
  657  */
  658 #define HW_MACHINE       1              /* string: machine class */
  659 #define HW_MODEL         2              /* string: specific machine model */
  660 #define HW_NCPU          3              /* int: number of cpus */
  661 #define HW_BYTEORDER     4              /* int: machine byte order */
  662 #define HW_PHYSMEM       5              /* int: total memory */
  663 #define HW_USERMEM       6              /* int: non-kernel memory */
  664 #define HW_PAGESIZE      7              /* int: software page size */
  665 #define HW_DISKNAMES     8              /* strings: disk drive names */
  666 #define HW_DISKSTATS     9              /* struct: diskstats[] */
  667 #define HW_FLOATINGPT   10              /* int: has HW floating point? */
  668 #define HW_MACHINE_ARCH 11              /* string: machine architecture */
  669 #define HW_REALMEM      12              /* int: 'real' memory */
  670 #define HW_MAXID        13              /* number of valid hw ids */
  671 
  672 /*
  673  * CTL_USER definitions
  674  */
  675 #define USER_CS_PATH             1      /* string: _CS_PATH */
  676 #define USER_BC_BASE_MAX         2      /* int: BC_BASE_MAX */
  677 #define USER_BC_DIM_MAX          3      /* int: BC_DIM_MAX */
  678 #define USER_BC_SCALE_MAX        4      /* int: BC_SCALE_MAX */
  679 #define USER_BC_STRING_MAX       5      /* int: BC_STRING_MAX */
  680 #define USER_COLL_WEIGHTS_MAX    6      /* int: COLL_WEIGHTS_MAX */
  681 #define USER_EXPR_NEST_MAX       7      /* int: EXPR_NEST_MAX */
  682 #define USER_LINE_MAX            8      /* int: LINE_MAX */
  683 #define USER_RE_DUP_MAX          9      /* int: RE_DUP_MAX */
  684 #define USER_POSIX2_VERSION     10      /* int: POSIX2_VERSION */
  685 #define USER_POSIX2_C_BIND      11      /* int: POSIX2_C_BIND */
  686 #define USER_POSIX2_C_DEV       12      /* int: POSIX2_C_DEV */
  687 #define USER_POSIX2_CHAR_TERM   13      /* int: POSIX2_CHAR_TERM */
  688 #define USER_POSIX2_FORT_DEV    14      /* int: POSIX2_FORT_DEV */
  689 #define USER_POSIX2_FORT_RUN    15      /* int: POSIX2_FORT_RUN */
  690 #define USER_POSIX2_LOCALEDEF   16      /* int: POSIX2_LOCALEDEF */
  691 #define USER_POSIX2_SW_DEV      17      /* int: POSIX2_SW_DEV */
  692 #define USER_POSIX2_UPE         18      /* int: POSIX2_UPE */
  693 #define USER_STREAM_MAX         19      /* int: POSIX2_STREAM_MAX */
  694 #define USER_TZNAME_MAX         20      /* int: POSIX2_TZNAME_MAX */
  695 #define USER_MAXID              21      /* number of valid user ids */
  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_MQ_OPEN_MAX                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_SEM_VALUE_MAX              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 #ifdef _KERNEL
  726 
  727 /*
  728  * Declare some common oids.
  729  */
  730 extern struct sysctl_oid_list sysctl__children;
  731 SYSCTL_DECL(_kern);
  732 SYSCTL_DECL(_kern_features);
  733 SYSCTL_DECL(_kern_ipc);
  734 SYSCTL_DECL(_kern_proc);
  735 SYSCTL_DECL(_kern_sched);
  736 SYSCTL_DECL(_kern_sched_stats);
  737 SYSCTL_DECL(_sysctl);
  738 SYSCTL_DECL(_vm);
  739 SYSCTL_DECL(_vm_stats);
  740 SYSCTL_DECL(_vm_stats_misc);
  741 SYSCTL_DECL(_vfs);
  742 SYSCTL_DECL(_net);
  743 SYSCTL_DECL(_debug);
  744 SYSCTL_DECL(_debug_sizeof);
  745 SYSCTL_DECL(_dev);
  746 SYSCTL_DECL(_hw);
  747 SYSCTL_DECL(_hw_bus);
  748 SYSCTL_DECL(_hw_bus_devices);
  749 SYSCTL_DECL(_hw_bus_info);
  750 SYSCTL_DECL(_machdep);
  751 SYSCTL_DECL(_user);
  752 SYSCTL_DECL(_compat);
  753 SYSCTL_DECL(_regression);
  754 SYSCTL_DECL(_security);
  755 SYSCTL_DECL(_security_bsd);
  756 
  757 extern char     machine[];
  758 extern char     osrelease[];
  759 extern char     ostype[];
  760 extern char     kern_ident[];
  761 
  762 /* Dynamic oid handling */
  763 struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist,
  764             struct sysctl_oid_list *parent, int nbr, const char *name, int kind,
  765             void *arg1, intptr_t arg2, int (*handler)(SYSCTL_HANDLER_ARGS),
  766             const char *fmt, const char *descr);
  767 int     sysctl_remove_name(struct sysctl_oid *parent, const char *name, int del,
  768             int recurse);
  769 void    sysctl_rename_oid(struct sysctl_oid *oidp, const char *name);
  770 int     sysctl_move_oid(struct sysctl_oid *oidp,
  771             struct sysctl_oid_list *parent);
  772 int     sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse);
  773 int     sysctl_ctx_init(struct sysctl_ctx_list *clist);
  774 int     sysctl_ctx_free(struct sysctl_ctx_list *clist);
  775 struct  sysctl_ctx_entry *sysctl_ctx_entry_add(struct sysctl_ctx_list *clist,
  776             struct sysctl_oid *oidp);
  777 struct  sysctl_ctx_entry *sysctl_ctx_entry_find(struct sysctl_ctx_list *clist,
  778             struct sysctl_oid *oidp);
  779 int     sysctl_ctx_entry_del(struct sysctl_ctx_list *clist,
  780             struct sysctl_oid *oidp);
  781 
  782 int     kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
  783             size_t *oldlenp, void *new, size_t newlen, size_t *retval,
  784             int flags);
  785 int     kernel_sysctlbyname(struct thread *td, char *name, void *old,
  786             size_t *oldlenp, void *new, size_t newlen, size_t *retval,
  787             int flags);
  788 int     userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
  789             size_t *oldlenp, int inkernel, void *new, size_t newlen,
  790             size_t *retval, int flags);
  791 int     sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
  792             int *nindx, struct sysctl_req *req);
  793 void    sysctl_lock(void);
  794 void    sysctl_unlock(void);
  795 int     sysctl_wire_old_buffer(struct sysctl_req *req, size_t len);
  796 
  797 struct sbuf;
  798 struct sbuf *sbuf_new_for_sysctl(struct sbuf *, char *, int,
  799             struct sysctl_req *);
  800 #else   /* !_KERNEL */
  801 #include <sys/cdefs.h>
  802 
  803 __BEGIN_DECLS
  804 int     sysctl(const int *, u_int, void *, size_t *, const void *, size_t);
  805 int     sysctlbyname(const char *, void *, size_t *, const void *, size_t);
  806 int     sysctlnametomib(const char *, int *, size_t *);
  807 __END_DECLS
  808 #endif  /* _KERNEL */
  809 
  810 #endif  /* !_SYS_SYSCTL_H_ */

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