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/11.1/sys/sys/sysctl.h 300718 2016-05-26 08:41:55Z 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 #define CTLTYPE_U8      0xa     /* name describes an unsigned 8-bit number */
   77 #define CTLTYPE_U16     0xb     /* name describes an unsigned 16-bit number */
   78 #define CTLTYPE_S8      0xc     /* name describes a signed 8-bit number */
   79 #define CTLTYPE_S16     0xd     /* name describes a signed 16-bit number */
   80 #define CTLTYPE_S32     0xe     /* name describes a signed 32-bit number */
   81 #define CTLTYPE_U32     0xf     /* name describes an unsigned 32-bit number */
   82 
   83 #define CTLFLAG_RD      0x80000000      /* Allow reads of variable */
   84 #define CTLFLAG_WR      0x40000000      /* Allow writes to the variable */
   85 #define CTLFLAG_RW      (CTLFLAG_RD|CTLFLAG_WR)
   86 #define CTLFLAG_ANYBODY 0x10000000      /* All users can set this var */
   87 #define CTLFLAG_SECURE  0x08000000      /* Permit set only if securelevel<=0 */
   88 #define CTLFLAG_PRISON  0x04000000      /* Prisoned roots can fiddle */
   89 #define CTLFLAG_DYN     0x02000000      /* Dynamic oid - can be freed */
   90 #define CTLFLAG_SKIP    0x01000000      /* Skip this sysctl when listing */
   91 #define CTLMASK_SECURE  0x00F00000      /* Secure level */
   92 #define CTLFLAG_TUN     0x00080000      /* Default value is loaded from getenv() */
   93 #define CTLFLAG_RDTUN   (CTLFLAG_RD|CTLFLAG_TUN)
   94 #define CTLFLAG_RWTUN   (CTLFLAG_RW|CTLFLAG_TUN)
   95 #define CTLFLAG_MPSAFE  0x00040000      /* Handler is MP safe */
   96 #define CTLFLAG_VNET    0x00020000      /* Prisons with vnet can fiddle */
   97 #define CTLFLAG_DYING   0x00010000      /* Oid is being removed */
   98 #define CTLFLAG_CAPRD   0x00008000      /* Can be read in capability mode */
   99 #define CTLFLAG_CAPWR   0x00004000      /* Can be written in capability mode */
  100 #define CTLFLAG_STATS   0x00002000      /* Statistics, not a tuneable */
  101 #define CTLFLAG_NOFETCH 0x00001000      /* Don't fetch tunable from getenv() */
  102 #define CTLFLAG_CAPRW   (CTLFLAG_CAPRD|CTLFLAG_CAPWR)
  103 
  104 /*
  105  * Secure level.   Note that CTLFLAG_SECURE == CTLFLAG_SECURE1.
  106  *
  107  * Secure when the securelevel is raised to at least N.
  108  */
  109 #define CTLSHIFT_SECURE 20
  110 #define CTLFLAG_SECURE1 (CTLFLAG_SECURE | (0 << CTLSHIFT_SECURE))
  111 #define CTLFLAG_SECURE2 (CTLFLAG_SECURE | (1 << CTLSHIFT_SECURE))
  112 #define CTLFLAG_SECURE3 (CTLFLAG_SECURE | (2 << CTLSHIFT_SECURE))
  113 
  114 /*
  115  * USE THIS instead of a hardwired number from the categories below
  116  * to get dynamically assigned sysctl entries using the linker-set
  117  * technology. This is the way nearly all new sysctl variables should
  118  * be implemented.
  119  * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
  120  */
  121 #define OID_AUTO        (-1)
  122 
  123 /*
  124  * The starting number for dynamically-assigned entries.  WARNING!
  125  * ALL static sysctl entries should have numbers LESS than this!
  126  */
  127 #define CTL_AUTO_START  0x100
  128 
  129 #ifdef _KERNEL
  130 #include <sys/linker_set.h>
  131 
  132 #ifdef KLD_MODULE
  133 /* XXX allow overspecification of type in external kernel modules */
  134 #define SYSCTL_CT_ASSERT_MASK CTLTYPE
  135 #else
  136 #define SYSCTL_CT_ASSERT_MASK 0
  137 #endif
  138 
  139 #define SYSCTL_HANDLER_ARGS struct sysctl_oid *oidp, void *arg1,        \
  140         intmax_t arg2, struct sysctl_req *req
  141 
  142 /* definitions for sysctl_req 'lock' member */
  143 #define REQ_UNWIRED     1
  144 #define REQ_WIRED       2
  145 
  146 /* definitions for sysctl_req 'flags' member */
  147 #if defined(__amd64__) || defined(__powerpc64__) ||\
  148     (defined(__mips__) && defined(__mips_n64))
  149 #define SCTL_MASK32     1       /* 32 bit emulation */
  150 #endif
  151 
  152 /*
  153  * This describes the access space for a sysctl request.  This is needed
  154  * so that we can use the interface from the kernel or from user-space.
  155  */
  156 struct sysctl_req {
  157         struct thread   *td;            /* used for access checking */
  158         int              lock;          /* wiring state */
  159         void            *oldptr;
  160         size_t           oldlen;
  161         size_t           oldidx;
  162         int             (*oldfunc)(struct sysctl_req *, const void *, size_t);
  163         void            *newptr;
  164         size_t           newlen;
  165         size_t           newidx;
  166         int             (*newfunc)(struct sysctl_req *, void *, size_t);
  167         size_t           validlen;
  168         int              flags;
  169 };
  170 
  171 SLIST_HEAD(sysctl_oid_list, sysctl_oid);
  172 
  173 /*
  174  * This describes one "oid" in the MIB tree.  Potentially more nodes can
  175  * be hidden behind it, expanded by the handler.
  176  */
  177 struct sysctl_oid {
  178         struct sysctl_oid_list oid_children;
  179         struct sysctl_oid_list *oid_parent;
  180         SLIST_ENTRY(sysctl_oid) oid_link;
  181         int              oid_number;
  182         u_int            oid_kind;
  183         void            *oid_arg1;
  184         intmax_t         oid_arg2;
  185         const char      *oid_name;
  186         int             (*oid_handler)(SYSCTL_HANDLER_ARGS);
  187         const char      *oid_fmt;
  188         int              oid_refcnt;
  189         u_int            oid_running;
  190         const char      *oid_descr;
  191 };
  192 
  193 #define SYSCTL_IN(r, p, l)      (r->newfunc)(r, p, l)
  194 #define SYSCTL_OUT(r, p, l)     (r->oldfunc)(r, p, l)
  195 #define SYSCTL_OUT_STR(r, p)    (r->oldfunc)(r, p, strlen(p) + 1)
  196 
  197 int sysctl_handle_bool(SYSCTL_HANDLER_ARGS);
  198 int sysctl_handle_8(SYSCTL_HANDLER_ARGS);
  199 int sysctl_handle_16(SYSCTL_HANDLER_ARGS);
  200 int sysctl_handle_32(SYSCTL_HANDLER_ARGS);
  201 int sysctl_handle_64(SYSCTL_HANDLER_ARGS);
  202 int sysctl_handle_int(SYSCTL_HANDLER_ARGS);
  203 int sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS);
  204 int sysctl_handle_long(SYSCTL_HANDLER_ARGS);
  205 int sysctl_handle_string(SYSCTL_HANDLER_ARGS);
  206 int sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
  207 int sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS);
  208 int sysctl_handle_counter_u64_array(SYSCTL_HANDLER_ARGS);
  209 
  210 int sysctl_handle_uma_zone_max(SYSCTL_HANDLER_ARGS);
  211 int sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS);
  212 
  213 int sysctl_dpcpu_int(SYSCTL_HANDLER_ARGS);
  214 int sysctl_dpcpu_long(SYSCTL_HANDLER_ARGS);
  215 int sysctl_dpcpu_quad(SYSCTL_HANDLER_ARGS);
  216 
  217 /*
  218  * These functions are used to add/remove an oid from the mib.
  219  */
  220 void sysctl_register_oid(struct sysctl_oid *oidp);
  221 void sysctl_unregister_oid(struct sysctl_oid *oidp);
  222 
  223 /* Declare a static oid to allow child oids to be added to it. */
  224 #define SYSCTL_DECL(name)                       \
  225         extern struct sysctl_oid sysctl__##name
  226 
  227 /* Hide these in macros. */
  228 #define SYSCTL_CHILDREN(oid_ptr)                (&(oid_ptr)->oid_children)
  229 #define SYSCTL_PARENT(oid_ptr)                                  \
  230     (((oid_ptr)->oid_parent != &sysctl__children) ?             \
  231         __containerof((oid_ptr)->oid_parent, struct sysctl_oid, \
  232         oid_children) : (struct sysctl_oid *)NULL)
  233 #define SYSCTL_STATIC_CHILDREN(oid_name)        (&sysctl__##oid_name.oid_children)
  234 
  235 /* === Structs and macros related to context handling. === */
  236 
  237 /* All dynamically created sysctls can be tracked in a context list. */
  238 struct sysctl_ctx_entry {
  239         struct sysctl_oid *entry;
  240         TAILQ_ENTRY(sysctl_ctx_entry) link;
  241 };
  242 
  243 TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
  244 
  245 #define SYSCTL_NODE_CHILDREN(parent, name) \
  246         sysctl__##parent##_##name.oid_children
  247 
  248 #ifndef NO_SYSCTL_DESCR
  249 #define __DESCR(d) d
  250 #else
  251 #define __DESCR(d) ""
  252 #endif
  253 
  254 /* This macro is only for internal use */
  255 #define SYSCTL_OID_RAW(id, parent_child_head, nbr, name, kind, a1, a2, handler, fmt, descr) \
  256         struct sysctl_oid id = {                                        \
  257                 .oid_parent = (parent_child_head),                      \
  258                 .oid_children = SLIST_HEAD_INITIALIZER(&id.oid_children), \
  259                 .oid_number = (nbr),                                    \
  260                 .oid_kind = (kind),                                     \
  261                 .oid_arg1 = (a1),                                       \
  262                 .oid_arg2 = (a2),                                       \
  263                 .oid_name = (name),                                     \
  264                 .oid_handler = (handler),                               \
  265                 .oid_fmt = (fmt),                                       \
  266                 .oid_descr = __DESCR(descr)                             \
  267         };                                                              \
  268         DATA_SET(sysctl_set, id)
  269 
  270 /* This constructs a static "raw" MIB oid. */
  271 #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
  272     static SYSCTL_OID_RAW(sysctl__##parent##_##name, \
  273         SYSCTL_CHILDREN(&sysctl__##parent), \
  274         nbr, #name, kind, a1, a2, handler, fmt, descr)
  275 
  276 /* This constructs a global "raw" MIB oid. */
  277 #define SYSCTL_OID_GLOBAL(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
  278     SYSCTL_OID_RAW(sysctl__##parent##_##name, \
  279         SYSCTL_CHILDREN(&sysctl__##parent),     \
  280         nbr, #name, kind, a1, a2, handler, fmt, descr)
  281 
  282 #define SYSCTL_ADD_OID(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
  283         sysctl_add_oid(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, __DESCR(descr))
  284 
  285 /* This constructs a root node from which other nodes can hang. */
  286 #define SYSCTL_ROOT_NODE(nbr, name, access, handler, descr)     \
  287         SYSCTL_OID_RAW(sysctl___##name, &sysctl__children,      \
  288             nbr, #name, CTLTYPE_NODE|(access), NULL, 0,         \
  289             handler, "N", descr);                               \
  290         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  291             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_NODE)
  292 
  293 /* This constructs a node from which other oids can hang. */
  294 #define SYSCTL_NODE(parent, nbr, name, access, handler, descr)          \
  295         SYSCTL_OID_GLOBAL(parent, nbr, name, CTLTYPE_NODE|(access),     \
  296             NULL, 0, handler, "N", descr);                              \
  297         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  298             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_NODE)
  299 
  300 #define SYSCTL_ADD_NODE(ctx, parent, nbr, name, access, handler, descr) \
  301 ({                                                                      \
  302         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  303             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_NODE);        \
  304         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|(access),   \
  305             NULL, 0, handler, "N", __DESCR(descr));                     \
  306 })
  307 
  308 #define SYSCTL_ADD_ROOT_NODE(ctx, nbr, name, access, handler, descr)    \
  309 ({                                                                      \
  310         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  311             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_NODE);        \
  312         sysctl_add_oid(ctx, &sysctl__children, nbr, name,               \
  313             CTLTYPE_NODE|(access),                                      \
  314             NULL, 0, handler, "N", __DESCR(descr));                     \
  315 })
  316 
  317 /* Oid for a string.  len can be 0 to indicate '\0' termination. */
  318 #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)       \
  319         SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access),          \
  320             arg, len, sysctl_handle_string, "A", descr);                \
  321         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  322             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_STRING)
  323 
  324 #define SYSCTL_ADD_STRING(ctx, parent, nbr, name, access, arg, len, descr) \
  325 ({                                                                      \
  326         char *__arg = (arg);                                            \
  327         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  328             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_STRING);      \
  329         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_STRING|(access), \
  330             __arg, len, sysctl_handle_string, "A", __DESCR(descr));     \
  331 })
  332 
  333 /* Oid for a bool.  If ptr is NULL, val is returned. */
  334 #define SYSCTL_NULL_BOOL_PTR ((bool *)NULL)
  335 #define SYSCTL_BOOL(parent, nbr, name, access, ptr, val, descr) \
  336         SYSCTL_OID(parent, nbr, name,                           \
  337             CTLTYPE_U8 | CTLFLAG_MPSAFE | (access),             \
  338             ptr, val, sysctl_handle_bool, "CU", descr);         \
  339         CTASSERT(((access) & CTLTYPE) == 0 &&                   \
  340             sizeof(bool) == sizeof(*(ptr)))
  341 
  342 #define SYSCTL_ADD_BOOL(ctx, parent, nbr, name, access, ptr, val, descr) \
  343 ({                                                                      \
  344         bool *__ptr = (ptr);                                            \
  345         CTASSERT(((access) & CTLTYPE) == 0);                            \
  346         sysctl_add_oid(ctx, parent, nbr, name,                          \
  347             CTLTYPE_U8 | CTLFLAG_MPSAFE | (access),                     \
  348             __ptr, val, sysctl_handle_bool, "CU", __DESCR(descr));      \
  349 })
  350 
  351 /* Oid for a signed 8-bit int.  If ptr is NULL, val is returned. */
  352 #define SYSCTL_NULL_S8_PTR ((int8_t *)NULL)
  353 #define SYSCTL_S8(parent, nbr, name, access, ptr, val, descr)   \
  354         SYSCTL_OID(parent, nbr, name,                           \
  355             CTLTYPE_S8 | CTLFLAG_MPSAFE | (access),             \
  356             ptr, val, sysctl_handle_8, "C", descr);             \
  357         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  358             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S8) && \
  359             sizeof(int8_t) == sizeof(*(ptr)))
  360 
  361 #define SYSCTL_ADD_S8(ctx, parent, nbr, name, access, ptr, val, descr)  \
  362 ({                                                                      \
  363         int8_t *__ptr = (ptr);                                          \
  364         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  365             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S8);          \
  366         sysctl_add_oid(ctx, parent, nbr, name,                          \
  367             CTLTYPE_S8 | CTLFLAG_MPSAFE | (access),                     \
  368             __ptr, val, sysctl_handle_8, "C", __DESCR(descr));  \
  369 })
  370 
  371 /* Oid for an unsigned 8-bit int.  If ptr is NULL, val is returned. */
  372 #define SYSCTL_NULL_U8_PTR ((uint8_t *)NULL)
  373 #define SYSCTL_U8(parent, nbr, name, access, ptr, val, descr)   \
  374         SYSCTL_OID(parent, nbr, name,                           \
  375             CTLTYPE_U8 | CTLFLAG_MPSAFE | (access),             \
  376             ptr, val, sysctl_handle_8, "CU", descr);            \
  377         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  378             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U8) && \
  379             sizeof(uint8_t) == sizeof(*(ptr)))
  380 
  381 #define SYSCTL_ADD_U8(ctx, parent, nbr, name, access, ptr, val, descr)  \
  382 ({                                                                      \
  383         uint8_t *__ptr = (ptr);                                         \
  384         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  385             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U8);          \
  386         sysctl_add_oid(ctx, parent, nbr, name,                          \
  387             CTLTYPE_U8 | CTLFLAG_MPSAFE | (access),                     \
  388             __ptr, val, sysctl_handle_8, "CU", __DESCR(descr)); \
  389 })
  390 
  391 /* Oid for a signed 16-bit int.  If ptr is NULL, val is returned. */
  392 #define SYSCTL_NULL_S16_PTR ((int16_t *)NULL)
  393 #define SYSCTL_S16(parent, nbr, name, access, ptr, val, descr)  \
  394         SYSCTL_OID(parent, nbr, name,                           \
  395             CTLTYPE_S16 | CTLFLAG_MPSAFE | (access),            \
  396             ptr, val, sysctl_handle_16, "S", descr);            \
  397         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  398             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S16) && \
  399             sizeof(int16_t) == sizeof(*(ptr)))
  400 
  401 #define SYSCTL_ADD_S16(ctx, parent, nbr, name, access, ptr, val, descr) \
  402 ({                                                                      \
  403         int16_t *__ptr = (ptr);                                         \
  404         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  405             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S16);         \
  406         sysctl_add_oid(ctx, parent, nbr, name,                          \
  407             CTLTYPE_S16 | CTLFLAG_MPSAFE | (access),                    \
  408             __ptr, val, sysctl_handle_16, "S", __DESCR(descr)); \
  409 })
  410 
  411 /* Oid for an unsigned 16-bit int.  If ptr is NULL, val is returned. */
  412 #define SYSCTL_NULL_U16_PTR ((uint16_t *)NULL)
  413 #define SYSCTL_U16(parent, nbr, name, access, ptr, val, descr)  \
  414         SYSCTL_OID(parent, nbr, name,                           \
  415             CTLTYPE_U16 | CTLFLAG_MPSAFE | (access),            \
  416             ptr, val, sysctl_handle_16, "SU", descr);           \
  417         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  418             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U16) && \
  419             sizeof(uint16_t) == sizeof(*(ptr)))
  420 
  421 #define SYSCTL_ADD_U16(ctx, parent, nbr, name, access, ptr, val, descr) \
  422 ({                                                                      \
  423         uint16_t *__ptr = (ptr);                                        \
  424         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  425             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U16);         \
  426         sysctl_add_oid(ctx, parent, nbr, name,                          \
  427             CTLTYPE_U16 | CTLFLAG_MPSAFE | (access),                    \
  428             __ptr, val, sysctl_handle_16, "SU", __DESCR(descr));        \
  429 })
  430 
  431 /* Oid for a signed 32-bit int.  If ptr is NULL, val is returned. */
  432 #define SYSCTL_NULL_S32_PTR ((int32_t *)NULL)
  433 #define SYSCTL_S32(parent, nbr, name, access, ptr, val, descr)  \
  434         SYSCTL_OID(parent, nbr, name,                           \
  435             CTLTYPE_S32 | CTLFLAG_MPSAFE | (access),            \
  436             ptr, val, sysctl_handle_32, "I", descr);            \
  437         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  438             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S32) && \
  439             sizeof(int32_t) == sizeof(*(ptr)))
  440 
  441 #define SYSCTL_ADD_S32(ctx, parent, nbr, name, access, ptr, val, descr) \
  442 ({                                                                      \
  443         int32_t *__ptr = (ptr);                                         \
  444         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  445             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S32);         \
  446         sysctl_add_oid(ctx, parent, nbr, name,                          \
  447             CTLTYPE_S32 | CTLFLAG_MPSAFE | (access),                    \
  448             __ptr, val, sysctl_handle_32, "I", __DESCR(descr)); \
  449 })
  450 
  451 /* Oid for an unsigned 32-bit int.  If ptr is NULL, val is returned. */
  452 #define SYSCTL_NULL_U32_PTR ((uint32_t *)NULL)
  453 #define SYSCTL_U32(parent, nbr, name, access, ptr, val, descr)  \
  454         SYSCTL_OID(parent, nbr, name,                           \
  455             CTLTYPE_U32 | CTLFLAG_MPSAFE | (access),            \
  456             ptr, val, sysctl_handle_32, "IU", descr);           \
  457         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  458             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U32) && \
  459             sizeof(uint32_t) == sizeof(*(ptr)))
  460 
  461 #define SYSCTL_ADD_U32(ctx, parent, nbr, name, access, ptr, val, descr) \
  462 ({                                                                      \
  463         uint32_t *__ptr = (ptr);                                        \
  464         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  465             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U32);         \
  466         sysctl_add_oid(ctx, parent, nbr, name,                          \
  467             CTLTYPE_U32 | CTLFLAG_MPSAFE | (access),                    \
  468             __ptr, val, sysctl_handle_32, "IU", __DESCR(descr));        \
  469 })
  470 
  471 /* Oid for a signed 64-bit int.  If ptr is NULL, val is returned. */
  472 #define SYSCTL_NULL_S64_PTR ((int64_t *)NULL)
  473 #define SYSCTL_S64(parent, nbr, name, access, ptr, val, descr)  \
  474         SYSCTL_OID(parent, nbr, name,                           \
  475             CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),            \
  476             ptr, val, sysctl_handle_64, "Q", descr);            \
  477         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  478             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64) && \
  479             sizeof(int64_t) == sizeof(*(ptr)))
  480 
  481 #define SYSCTL_ADD_S64(ctx, parent, nbr, name, access, ptr, val, descr) \
  482 ({                                                                      \
  483         int64_t *__ptr = (ptr);                                         \
  484         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  485             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64);         \
  486         sysctl_add_oid(ctx, parent, nbr, name,                          \
  487             CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),                    \
  488             __ptr, val, sysctl_handle_64, "Q", __DESCR(descr)); \
  489 })
  490 
  491 /* Oid for an unsigned 64-bit int.  If ptr is NULL, val is returned. */
  492 #define SYSCTL_NULL_U64_PTR ((uint64_t *)NULL)
  493 #define SYSCTL_U64(parent, nbr, name, access, ptr, val, descr)  \
  494         SYSCTL_OID(parent, nbr, name,                           \
  495             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),            \
  496             ptr, val, sysctl_handle_64, "QU", descr);           \
  497         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  498             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64) && \
  499             sizeof(uint64_t) == sizeof(*(ptr)))
  500 
  501 #define SYSCTL_ADD_U64(ctx, parent, nbr, name, access, ptr, val, descr) \
  502 ({                                                                      \
  503         uint64_t *__ptr = (ptr);                                        \
  504         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  505             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64);         \
  506         sysctl_add_oid(ctx, parent, nbr, name,                          \
  507             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  508             __ptr, val, sysctl_handle_64, "QU", __DESCR(descr));        \
  509 })
  510 
  511 /* Oid for an int.  If ptr is SYSCTL_NULL_INT_PTR, val is returned. */
  512 #define SYSCTL_NULL_INT_PTR ((int *)NULL)
  513 #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)  \
  514         SYSCTL_OID(parent, nbr, name,                           \
  515             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),            \
  516             ptr, val, sysctl_handle_int, "I", descr);           \
  517         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  518             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT) && \
  519             sizeof(int) == sizeof(*(ptr)))
  520 
  521 #define SYSCTL_ADD_INT(ctx, parent, nbr, name, access, ptr, val, descr) \
  522 ({                                                                      \
  523         int *__ptr = (ptr);                                             \
  524         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  525             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT);         \
  526         sysctl_add_oid(ctx, parent, nbr, name,                          \
  527             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),                    \
  528             __ptr, val, sysctl_handle_int, "I", __DESCR(descr));        \
  529 })
  530 
  531 /* Oid for an unsigned int.  If ptr is NULL, val is returned. */
  532 #define SYSCTL_NULL_UINT_PTR ((unsigned *)NULL)
  533 #define SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr) \
  534         SYSCTL_OID(parent, nbr, name,                           \
  535             CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),           \
  536             ptr, val, sysctl_handle_int, "IU", descr);          \
  537         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  538             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_UINT) && \
  539             sizeof(unsigned) == sizeof(*(ptr)))
  540 
  541 #define SYSCTL_ADD_UINT(ctx, parent, nbr, name, access, ptr, val, descr) \
  542 ({                                                                      \
  543         unsigned *__ptr = (ptr);                                        \
  544         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  545             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_UINT);        \
  546         sysctl_add_oid(ctx, parent, nbr, name,                          \
  547             CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),                   \
  548             __ptr, val, sysctl_handle_int, "IU", __DESCR(descr));       \
  549 })
  550 
  551 /* Oid for a long.  The pointer must be non NULL. */
  552 #define SYSCTL_NULL_LONG_PTR ((long *)NULL)
  553 #define SYSCTL_LONG(parent, nbr, name, access, ptr, val, descr) \
  554         SYSCTL_OID(parent, nbr, name,                           \
  555             CTLTYPE_LONG | CTLFLAG_MPSAFE | (access),           \
  556             ptr, val, sysctl_handle_long, "L", descr);          \
  557         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  558             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_LONG) && \
  559             sizeof(long) == sizeof(*(ptr)))
  560 
  561 #define SYSCTL_ADD_LONG(ctx, parent, nbr, name, access, ptr, descr)     \
  562 ({                                                                      \
  563         long *__ptr = (ptr);                                            \
  564         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  565             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_LONG);        \
  566         sysctl_add_oid(ctx, parent, nbr, name,                          \
  567             CTLTYPE_LONG | CTLFLAG_MPSAFE | (access),                   \
  568             __ptr, 0, sysctl_handle_long, "L", __DESCR(descr));         \
  569 })
  570 
  571 /* Oid for an unsigned long.  The pointer must be non NULL. */
  572 #define SYSCTL_NULL_ULONG_PTR ((unsigned long *)NULL)
  573 #define SYSCTL_ULONG(parent, nbr, name, access, ptr, val, descr)        \
  574         SYSCTL_OID(parent, nbr, name,                                   \
  575             CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access),                  \
  576             ptr, val, sysctl_handle_long, "LU", descr);                 \
  577         CTASSERT((((access) & CTLTYPE) == 0 ||                          \
  578             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_ULONG) &&     \
  579             sizeof(unsigned long) == sizeof(*(ptr)))
  580 
  581 #define SYSCTL_ADD_ULONG(ctx, parent, nbr, name, access, ptr, descr)    \
  582 ({                                                                      \
  583         unsigned long *__ptr = (ptr);                                   \
  584         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  585             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_ULONG);       \
  586         sysctl_add_oid(ctx, parent, nbr, name,                          \
  587             CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access),                  \
  588             __ptr, 0, sysctl_handle_long, "LU", __DESCR(descr));        \
  589 })
  590 
  591 /* Oid for a quad.  The pointer must be non NULL. */
  592 #define SYSCTL_NULL_QUAD_PTR ((int64_t *)NULL)
  593 #define SYSCTL_QUAD(parent, nbr, name, access, ptr, val, descr) \
  594         SYSCTL_OID(parent, nbr, name,                           \
  595             CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),            \
  596             ptr, val, sysctl_handle_64, "Q", descr);            \
  597         CTASSERT((((access) & CTLTYPE) == 0 ||                  \
  598             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64) && \
  599             sizeof(int64_t) == sizeof(*(ptr)))
  600 
  601 #define SYSCTL_ADD_QUAD(ctx, parent, nbr, name, access, ptr, descr)     \
  602 ({                                                                      \
  603         int64_t *__ptr = (ptr);                                         \
  604         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  605             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_S64);         \
  606         sysctl_add_oid(ctx, parent, nbr, name,                          \
  607             CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),                    \
  608             __ptr, 0, sysctl_handle_64, "Q", __DESCR(descr));           \
  609 })
  610 
  611 #define SYSCTL_NULL_UQUAD_PTR ((uint64_t *)NULL)
  612 #define SYSCTL_UQUAD(parent, nbr, name, access, ptr, val, descr)        \
  613         SYSCTL_OID(parent, nbr, name,                                   \
  614             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  615              ptr, val, sysctl_handle_64, "QU", descr);                  \
  616         CTASSERT((((access) & CTLTYPE) == 0 ||                          \
  617             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64) &&       \
  618             sizeof(uint64_t) == sizeof(*(ptr)))
  619 
  620 #define SYSCTL_ADD_UQUAD(ctx, parent, nbr, name, access, ptr, descr)    \
  621 ({                                                                      \
  622         uint64_t *__ptr = (ptr);                                        \
  623         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  624             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64);         \
  625         sysctl_add_oid(ctx, parent, nbr, name,                          \
  626             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  627             __ptr, 0, sysctl_handle_64, "QU", __DESCR(descr));          \
  628 })
  629 
  630 /* Oid for a CPU dependent variable */
  631 #define SYSCTL_ADD_UAUTO(ctx, parent, nbr, name, access, ptr, descr)    \
  632 ({                                                                      \
  633         struct sysctl_oid *__ret;                                       \
  634         CTASSERT((sizeof(uint64_t) == sizeof(*(ptr)) ||                 \
  635             sizeof(unsigned) == sizeof(*(ptr))) &&                      \
  636             ((access) & CTLTYPE) == 0);                                 \
  637         if (sizeof(uint64_t) == sizeof(*(ptr))) {                       \
  638                 __ret = sysctl_add_oid(ctx, parent, nbr, name,          \
  639                     CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),            \
  640                     (ptr), 0, sysctl_handle_64, "QU",                   \
  641                     __DESCR(descr));                                    \
  642         } else {                                                        \
  643                 __ret = sysctl_add_oid(ctx, parent, nbr, name,          \
  644                     CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),           \
  645                     (ptr), 0, sysctl_handle_int, "IU",                  \
  646                     __DESCR(descr));                                    \
  647         }                                                               \
  648         __ret;                                                          \
  649 })
  650 
  651 /* Oid for a 64-bit unsigned counter(9).  The pointer must be non NULL. */
  652 #define SYSCTL_COUNTER_U64(parent, nbr, name, access, ptr, descr)       \
  653         SYSCTL_OID(parent, nbr, name,                                   \
  654             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  655             (ptr), 0, sysctl_handle_counter_u64, "QU", descr);          \
  656         CTASSERT((((access) & CTLTYPE) == 0 ||                          \
  657             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64) &&       \
  658             sizeof(counter_u64_t) == sizeof(*(ptr)) &&                  \
  659             sizeof(uint64_t) == sizeof(**(ptr)))
  660 
  661 #define SYSCTL_ADD_COUNTER_U64(ctx, parent, nbr, name, access, ptr, descr) \
  662 ({                                                                      \
  663         counter_u64_t *__ptr = (ptr);                                   \
  664         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  665             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_U64);         \
  666         sysctl_add_oid(ctx, parent, nbr, name,                          \
  667             CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),                    \
  668             __ptr, 0, sysctl_handle_counter_u64, "QU", __DESCR(descr)); \
  669 })
  670 
  671 /* Oid for an array of counter(9)s.  The pointer and length must be non zero. */
  672 #define SYSCTL_COUNTER_U64_ARRAY(parent, nbr, name, access, ptr, len, descr) \
  673         SYSCTL_OID(parent, nbr, name,                                   \
  674             CTLTYPE_OPAQUE | CTLFLAG_MPSAFE | (access),                 \
  675             (ptr), (len), sysctl_handle_counter_u64_array, "S", descr); \
  676         CTASSERT((((access) & CTLTYPE) == 0 ||                          \
  677             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE) &&    \
  678             sizeof(counter_u64_t) == sizeof(*(ptr)) &&                  \
  679             sizeof(uint64_t) == sizeof(**(ptr)))
  680 
  681 #define SYSCTL_ADD_COUNTER_U64_ARRAY(ctx, parent, nbr, name, access,    \
  682     ptr, len, descr)                                                    \
  683 ({                                                                      \
  684         counter_u64_t *__ptr = (ptr);                                   \
  685         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  686             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE);      \
  687         sysctl_add_oid(ctx, parent, nbr, name,                          \
  688             CTLTYPE_OPAQUE | CTLFLAG_MPSAFE | (access),                 \
  689             __ptr, len, sysctl_handle_counter_u64_array, "S",           \
  690             __DESCR(descr));                                            \
  691 })
  692 
  693 /* Oid for an opaque object.  Specified by a pointer and a length. */
  694 #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr)  \
  695         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access),          \
  696             ptr, len, sysctl_handle_opaque, fmt, descr);                \
  697         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  698             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE)
  699 
  700 #define SYSCTL_ADD_OPAQUE(ctx, parent, nbr, name, access, ptr, len, fmt, descr) \
  701 ({                                                                      \
  702         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  703             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE);      \
  704         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \
  705             ptr, len, sysctl_handle_opaque, fmt, __DESCR(descr));       \
  706 })
  707 
  708 /* Oid for a struct.  Specified by a pointer and a type. */
  709 #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)      \
  710         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access),          \
  711             ptr, sizeof(struct type), sysctl_handle_opaque,             \
  712             "S," #type, descr);                                         \
  713         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  714             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE)
  715 
  716 #define SYSCTL_ADD_STRUCT(ctx, parent, nbr, name, access, ptr, type, descr) \
  717 ({                                                                      \
  718         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  719             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_OPAQUE);      \
  720         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \
  721             (ptr), sizeof(struct type),                                 \
  722             sysctl_handle_opaque, "S," #type, __DESCR(descr));          \
  723 })
  724 
  725 /* Oid for a procedure.  Specified by a pointer and an arg. */
  726 #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
  727         SYSCTL_OID(parent, nbr, name, (access),                         \
  728             ptr, arg, handler, fmt, descr);                             \
  729         CTASSERT(((access) & CTLTYPE) != 0)
  730 
  731 #define SYSCTL_ADD_PROC(ctx, parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
  732 ({                                                                      \
  733         CTASSERT(((access) & CTLTYPE) != 0);                            \
  734         sysctl_add_oid(ctx, parent, nbr, name, (access),                \
  735             (ptr), (arg), (handler), (fmt), __DESCR(descr));            \
  736 })
  737 
  738 /* Oid to handle limits on uma(9) zone specified by pointer. */
  739 #define SYSCTL_UMA_MAX(parent, nbr, name, access, ptr, descr)   \
  740         SYSCTL_OID(parent, nbr, name,                           \
  741             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),            \
  742             (ptr), 0, sysctl_handle_uma_zone_max, "I", descr);  \
  743         CTASSERT(((access) & CTLTYPE) == 0 ||                   \
  744             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT)
  745 
  746 #define SYSCTL_ADD_UMA_MAX(ctx, parent, nbr, name, access, ptr, descr)  \
  747 ({                                                                      \
  748         uma_zone_t __ptr = (ptr);                                       \
  749         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  750             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT);         \
  751         sysctl_add_oid(ctx, parent, nbr, name,                          \
  752             CTLTYPE_INT | CTLFLAG_MPSAFE | (access),                    \
  753             __ptr, 0, sysctl_handle_uma_zone_max, "I", __DESCR(descr)); \
  754 })
  755 
  756 /* Oid to obtain current use of uma(9) zone specified by pointer. */
  757 #define SYSCTL_UMA_CUR(parent, nbr, name, access, ptr, descr)           \
  758         SYSCTL_OID(parent, nbr, name,                                   \
  759             CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),       \
  760             (ptr), 0, sysctl_handle_uma_zone_cur, "I", descr);          \
  761         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  762             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT)
  763 
  764 #define SYSCTL_ADD_UMA_CUR(ctx, parent, nbr, name, access, ptr, descr)  \
  765 ({                                                                      \
  766         uma_zone_t __ptr = (ptr);                                       \
  767         CTASSERT(((access) & CTLTYPE) == 0 ||                           \
  768             ((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT);         \
  769         sysctl_add_oid(ctx, parent, nbr, name,                          \
  770             CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),       \
  771             __ptr, 0, sysctl_handle_uma_zone_cur, "I", __DESCR(descr)); \
  772 })
  773 
  774 /*
  775  * A macro to generate a read-only sysctl to indicate the presence of optional
  776  * kernel features.
  777  */
  778 #define FEATURE(name, desc)                                             \
  779         SYSCTL_INT(_kern_features, OID_AUTO, name, CTLFLAG_RD | CTLFLAG_CAPRD, \
  780             SYSCTL_NULL_INT_PTR, 1, desc)
  781 
  782 #endif /* _KERNEL */
  783 
  784 /*
  785  * Top-level identifiers
  786  */
  787 #define CTL_UNSPEC      0               /* unused */
  788 #define CTL_KERN        1               /* "high kernel": proc, limits */
  789 #define CTL_VM          2               /* virtual memory */
  790 #define CTL_VFS         3               /* filesystem, mount type is next */
  791 #define CTL_NET         4               /* network, see socket.h */
  792 #define CTL_DEBUG       5               /* debugging parameters */
  793 #define CTL_HW          6               /* generic cpu/io */
  794 #define CTL_MACHDEP     7               /* machine dependent */
  795 #define CTL_USER        8               /* user-level */
  796 #define CTL_P1003_1B    9               /* POSIX 1003.1B */
  797 
  798 /*
  799  * CTL_KERN identifiers
  800  */
  801 #define KERN_OSTYPE              1      /* string: system version */
  802 #define KERN_OSRELEASE           2      /* string: system release */
  803 #define KERN_OSREV               3      /* int: system revision */
  804 #define KERN_VERSION             4      /* string: compile time info */
  805 #define KERN_MAXVNODES           5      /* int: max vnodes */
  806 #define KERN_MAXPROC             6      /* int: max processes */
  807 #define KERN_MAXFILES            7      /* int: max open files */
  808 #define KERN_ARGMAX              8      /* int: max arguments to exec */
  809 #define KERN_SECURELVL           9      /* int: system security level */
  810 #define KERN_HOSTNAME           10      /* string: hostname */
  811 #define KERN_HOSTID             11      /* int: host identifier */
  812 #define KERN_CLOCKRATE          12      /* struct: struct clockrate */
  813 #define KERN_VNODE              13      /* struct: vnode structures */
  814 #define KERN_PROC               14      /* struct: process entries */
  815 #define KERN_FILE               15      /* struct: file entries */
  816 #define KERN_PROF               16      /* node: kernel profiling info */
  817 #define KERN_POSIX1             17      /* int: POSIX.1 version */
  818 #define KERN_NGROUPS            18      /* int: # of supplemental group ids */
  819 #define KERN_JOB_CONTROL        19      /* int: is job control available */
  820 #define KERN_SAVED_IDS          20      /* int: saved set-user/group-ID */
  821 #define KERN_BOOTTIME           21      /* struct: time kernel was booted */
  822 #define KERN_NISDOMAINNAME      22      /* string: YP domain name */
  823 #define KERN_UPDATEINTERVAL     23      /* int: update process sleep time */
  824 #define KERN_OSRELDATE          24      /* int: kernel release date */
  825 #define KERN_NTP_PLL            25      /* node: NTP PLL control */
  826 #define KERN_BOOTFILE           26      /* string: name of booted kernel */
  827 #define KERN_MAXFILESPERPROC    27      /* int: max open files per proc */
  828 #define KERN_MAXPROCPERUID      28      /* int: max processes per uid */
  829 #define KERN_DUMPDEV            29      /* struct cdev *: device to dump on */
  830 #define KERN_IPC                30      /* node: anything related to IPC */
  831 #define KERN_DUMMY              31      /* unused */
  832 #define KERN_PS_STRINGS         32      /* int: address of PS_STRINGS */
  833 #define KERN_USRSTACK           33      /* int: address of USRSTACK */
  834 #define KERN_LOGSIGEXIT         34      /* int: do we log sigexit procs? */
  835 #define KERN_IOV_MAX            35      /* int: value of UIO_MAXIOV */
  836 #define KERN_HOSTUUID           36      /* string: host UUID identifier */
  837 #define KERN_ARND               37      /* int: from arc4rand() */
  838 /*
  839  * KERN_PROC subtypes
  840  */
  841 #define KERN_PROC_ALL           0       /* everything */
  842 #define KERN_PROC_PID           1       /* by process id */
  843 #define KERN_PROC_PGRP          2       /* by process group id */
  844 #define KERN_PROC_SESSION       3       /* by session of pid */
  845 #define KERN_PROC_TTY           4       /* by controlling tty */
  846 #define KERN_PROC_UID           5       /* by effective uid */
  847 #define KERN_PROC_RUID          6       /* by real uid */
  848 #define KERN_PROC_ARGS          7       /* get/set arguments/proctitle */
  849 #define KERN_PROC_PROC          8       /* only return procs */
  850 #define KERN_PROC_SV_NAME       9       /* get syscall vector name */
  851 #define KERN_PROC_RGID          10      /* by real group id */
  852 #define KERN_PROC_GID           11      /* by effective group id */
  853 #define KERN_PROC_PATHNAME      12      /* path to executable */
  854 #define KERN_PROC_OVMMAP        13      /* Old VM map entries for process */
  855 #define KERN_PROC_OFILEDESC     14      /* Old file descriptors for process */
  856 #define KERN_PROC_KSTACK        15      /* Kernel stacks for process */
  857 #define KERN_PROC_INC_THREAD    0x10    /*
  858                                          * modifier for pid, pgrp, tty,
  859                                          * uid, ruid, gid, rgid and proc
  860                                          * This effectively uses 16-31
  861                                          */
  862 #define KERN_PROC_VMMAP         32      /* VM map entries for process */
  863 #define KERN_PROC_FILEDESC      33      /* File descriptors for process */
  864 #define KERN_PROC_GROUPS        34      /* process groups */
  865 #define KERN_PROC_ENV           35      /* get environment */
  866 #define KERN_PROC_AUXV          36      /* get ELF auxiliary vector */
  867 #define KERN_PROC_RLIMIT        37      /* process resource limits */
  868 #define KERN_PROC_PS_STRINGS    38      /* get ps_strings location */
  869 #define KERN_PROC_UMASK         39      /* process umask */
  870 #define KERN_PROC_OSREL         40      /* osreldate for process binary */
  871 #define KERN_PROC_SIGTRAMP      41      /* signal trampoline location */
  872 #define KERN_PROC_CWD           42      /* process current working directory */
  873 #define KERN_PROC_NFDS          43      /* number of open file descriptors */
  874 
  875 /*
  876  * KERN_IPC identifiers
  877  */
  878 #define KIPC_MAXSOCKBUF         1       /* int: max size of a socket buffer */
  879 #define KIPC_SOCKBUF_WASTE      2       /* int: wastage factor in sockbuf */
  880 #define KIPC_SOMAXCONN          3       /* int: max length of connection q */
  881 #define KIPC_MAX_LINKHDR        4       /* int: max length of link header */
  882 #define KIPC_MAX_PROTOHDR       5       /* int: max length of network header */
  883 #define KIPC_MAX_HDR            6       /* int: max total length of headers */
  884 #define KIPC_MAX_DATALEN        7       /* int: max length of data? */
  885 
  886 /*
  887  * CTL_HW identifiers
  888  */
  889 #define HW_MACHINE       1              /* string: machine class */
  890 #define HW_MODEL         2              /* string: specific machine model */
  891 #define HW_NCPU          3              /* int: number of cpus */
  892 #define HW_BYTEORDER     4              /* int: machine byte order */
  893 #define HW_PHYSMEM       5              /* int: total memory */
  894 #define HW_USERMEM       6              /* int: non-kernel memory */
  895 #define HW_PAGESIZE      7              /* int: software page size */
  896 #define HW_DISKNAMES     8              /* strings: disk drive names */
  897 #define HW_DISKSTATS     9              /* struct: diskstats[] */
  898 #define HW_FLOATINGPT   10              /* int: has HW floating point? */
  899 #define HW_MACHINE_ARCH 11              /* string: machine architecture */
  900 #define HW_REALMEM      12              /* int: 'real' memory */
  901 
  902 /*
  903  * CTL_USER definitions
  904  */
  905 #define USER_CS_PATH             1      /* string: _CS_PATH */
  906 #define USER_BC_BASE_MAX         2      /* int: BC_BASE_MAX */
  907 #define USER_BC_DIM_MAX          3      /* int: BC_DIM_MAX */
  908 #define USER_BC_SCALE_MAX        4      /* int: BC_SCALE_MAX */
  909 #define USER_BC_STRING_MAX       5      /* int: BC_STRING_MAX */
  910 #define USER_COLL_WEIGHTS_MAX    6      /* int: COLL_WEIGHTS_MAX */
  911 #define USER_EXPR_NEST_MAX       7      /* int: EXPR_NEST_MAX */
  912 #define USER_LINE_MAX            8      /* int: LINE_MAX */
  913 #define USER_RE_DUP_MAX          9      /* int: RE_DUP_MAX */
  914 #define USER_POSIX2_VERSION     10      /* int: POSIX2_VERSION */
  915 #define USER_POSIX2_C_BIND      11      /* int: POSIX2_C_BIND */
  916 #define USER_POSIX2_C_DEV       12      /* int: POSIX2_C_DEV */
  917 #define USER_POSIX2_CHAR_TERM   13      /* int: POSIX2_CHAR_TERM */
  918 #define USER_POSIX2_FORT_DEV    14      /* int: POSIX2_FORT_DEV */
  919 #define USER_POSIX2_FORT_RUN    15      /* int: POSIX2_FORT_RUN */
  920 #define USER_POSIX2_LOCALEDEF   16      /* int: POSIX2_LOCALEDEF */
  921 #define USER_POSIX2_SW_DEV      17      /* int: POSIX2_SW_DEV */
  922 #define USER_POSIX2_UPE         18      /* int: POSIX2_UPE */
  923 #define USER_STREAM_MAX         19      /* int: POSIX2_STREAM_MAX */
  924 #define USER_TZNAME_MAX         20      /* int: POSIX2_TZNAME_MAX */
  925 
  926 #define CTL_P1003_1B_ASYNCHRONOUS_IO            1       /* boolean */
  927 #define CTL_P1003_1B_MAPPED_FILES               2       /* boolean */
  928 #define CTL_P1003_1B_MEMLOCK                    3       /* boolean */
  929 #define CTL_P1003_1B_MEMLOCK_RANGE              4       /* boolean */
  930 #define CTL_P1003_1B_MEMORY_PROTECTION          5       /* boolean */
  931 #define CTL_P1003_1B_MESSAGE_PASSING            6       /* boolean */
  932 #define CTL_P1003_1B_PRIORITIZED_IO             7       /* boolean */
  933 #define CTL_P1003_1B_PRIORITY_SCHEDULING        8       /* boolean */
  934 #define CTL_P1003_1B_REALTIME_SIGNALS           9       /* boolean */
  935 #define CTL_P1003_1B_SEMAPHORES                 10      /* boolean */
  936 #define CTL_P1003_1B_FSYNC                      11      /* boolean */
  937 #define CTL_P1003_1B_SHARED_MEMORY_OBJECTS      12      /* boolean */
  938 #define CTL_P1003_1B_SYNCHRONIZED_IO            13      /* boolean */
  939 #define CTL_P1003_1B_TIMERS                     14      /* boolean */
  940 #define CTL_P1003_1B_AIO_LISTIO_MAX             15      /* int */
  941 #define CTL_P1003_1B_AIO_MAX                    16      /* int */
  942 #define CTL_P1003_1B_AIO_PRIO_DELTA_MAX         17      /* int */
  943 #define CTL_P1003_1B_DELAYTIMER_MAX             18      /* int */
  944 #define CTL_P1003_1B_MQ_OPEN_MAX                19      /* int */
  945 #define CTL_P1003_1B_PAGESIZE                   20      /* int */
  946 #define CTL_P1003_1B_RTSIG_MAX                  21      /* int */
  947 #define CTL_P1003_1B_SEM_NSEMS_MAX              22      /* int */
  948 #define CTL_P1003_1B_SEM_VALUE_MAX              23      /* int */
  949 #define CTL_P1003_1B_SIGQUEUE_MAX               24      /* int */
  950 #define CTL_P1003_1B_TIMER_MAX                  25      /* int */
  951 
  952 #define CTL_P1003_1B_MAXID              26
  953 
  954 #ifdef _KERNEL
  955 
  956 /*
  957  * Declare some common oids.
  958  */
  959 extern struct sysctl_oid_list sysctl__children;
  960 SYSCTL_DECL(_kern);
  961 SYSCTL_DECL(_kern_features);
  962 SYSCTL_DECL(_kern_ipc);
  963 SYSCTL_DECL(_kern_proc);
  964 SYSCTL_DECL(_kern_sched);
  965 SYSCTL_DECL(_kern_sched_stats);
  966 SYSCTL_DECL(_sysctl);
  967 SYSCTL_DECL(_vm);
  968 SYSCTL_DECL(_vm_stats);
  969 SYSCTL_DECL(_vm_stats_misc);
  970 SYSCTL_DECL(_vfs);
  971 SYSCTL_DECL(_net);
  972 SYSCTL_DECL(_debug);
  973 SYSCTL_DECL(_debug_sizeof);
  974 SYSCTL_DECL(_dev);
  975 SYSCTL_DECL(_hw);
  976 SYSCTL_DECL(_hw_bus);
  977 SYSCTL_DECL(_hw_bus_devices);
  978 SYSCTL_DECL(_hw_bus_info);
  979 SYSCTL_DECL(_machdep);
  980 SYSCTL_DECL(_user);
  981 SYSCTL_DECL(_compat);
  982 SYSCTL_DECL(_regression);
  983 SYSCTL_DECL(_security);
  984 SYSCTL_DECL(_security_bsd);
  985 
  986 extern char     machine[];
  987 extern char     osrelease[];
  988 extern char     ostype[];
  989 extern char     kern_ident[];
  990 
  991 /* Dynamic oid handling */
  992 struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist,
  993             struct sysctl_oid_list *parent, int nbr, const char *name, int kind,
  994             void *arg1, intmax_t arg2, int (*handler)(SYSCTL_HANDLER_ARGS),
  995             const char *fmt, const char *descr);
  996 int     sysctl_remove_name(struct sysctl_oid *parent, const char *name, int del,
  997             int recurse);
  998 void    sysctl_rename_oid(struct sysctl_oid *oidp, const char *name);
  999 int     sysctl_move_oid(struct sysctl_oid *oidp,
 1000             struct sysctl_oid_list *parent);
 1001 int     sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse);
 1002 int     sysctl_ctx_init(struct sysctl_ctx_list *clist);
 1003 int     sysctl_ctx_free(struct sysctl_ctx_list *clist);
 1004 struct  sysctl_ctx_entry *sysctl_ctx_entry_add(struct sysctl_ctx_list *clist,
 1005             struct sysctl_oid *oidp);
 1006 struct  sysctl_ctx_entry *sysctl_ctx_entry_find(struct sysctl_ctx_list *clist,
 1007             struct sysctl_oid *oidp);
 1008 int     sysctl_ctx_entry_del(struct sysctl_ctx_list *clist,
 1009             struct sysctl_oid *oidp);
 1010 
 1011 int     kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
 1012             size_t *oldlenp, void *new, size_t newlen, size_t *retval,
 1013             int flags);
 1014 int     kernel_sysctlbyname(struct thread *td, char *name, void *old,
 1015             size_t *oldlenp, void *new, size_t newlen, size_t *retval,
 1016             int flags);
 1017 int     userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
 1018             size_t *oldlenp, int inkernel, void *new, size_t newlen,
 1019             size_t *retval, int flags);
 1020 int     sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
 1021             int *nindx, struct sysctl_req *req);
 1022 void    sysctl_wlock(void);
 1023 void    sysctl_wunlock(void);
 1024 int     sysctl_wire_old_buffer(struct sysctl_req *req, size_t len);
 1025 
 1026 struct sbuf;
 1027 struct sbuf *sbuf_new_for_sysctl(struct sbuf *, char *, int,
 1028             struct sysctl_req *);
 1029 #else   /* !_KERNEL */
 1030 #include <sys/cdefs.h>
 1031 
 1032 __BEGIN_DECLS
 1033 int     sysctl(const int *, u_int, void *, size_t *, const void *, size_t);
 1034 int     sysctlbyname(const char *, void *, size_t *, const void *, size_t);
 1035 int     sysctlnametomib(const char *, int *, size_t *);
 1036 __END_DECLS
 1037 #endif  /* _KERNEL */
 1038 
 1039 #endif  /* !_SYS_SYSCTL_H_ */

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