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  * $FreeBSD$
   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_QUAD    4       /* name describes a 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 
   76 #define CTLFLAG_RD      0x80000000      /* Allow reads of variable */
   77 #define CTLFLAG_WR      0x40000000      /* Allow writes to the variable */
   78 #define CTLFLAG_RW      (CTLFLAG_RD|CTLFLAG_WR)
   79 #define CTLFLAG_NOLOCK  0x20000000      /* XXX Don't Lock */
   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_MPSAFE  0x00040000      /* Handler is MP safe */
   88 #define CTLFLAG_RDTUN   (CTLFLAG_RD|CTLFLAG_TUN)
   89 
   90 /*
   91  * Secure level.   Note that CTLFLAG_SECURE == CTLFLAG_SECURE1.  
   92  *
   93  * Secure when the securelevel is raised to at least N.
   94  */
   95 #define CTLSHIFT_SECURE 20
   96 #define CTLFLAG_SECURE1 (CTLFLAG_SECURE | (0 << CTLSHIFT_SECURE))
   97 #define CTLFLAG_SECURE2 (CTLFLAG_SECURE | (1 << CTLSHIFT_SECURE))
   98 #define CTLFLAG_SECURE3 (CTLFLAG_SECURE | (2 << CTLSHIFT_SECURE))
   99 
  100 /*
  101  * USE THIS instead of a hardwired number from the categories below
  102  * to get dynamically assigned sysctl entries using the linker-set
  103  * technology. This is the way nearly all new sysctl variables should
  104  * be implemented.
  105  * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
  106  */ 
  107 #define OID_AUTO        (-1)
  108 
  109 /*
  110  * The starting number for dynamically-assigned entries.  WARNING!
  111  * ALL static sysctl entries should have numbers LESS than this!
  112  */
  113 #define CTL_AUTO_START  0x100
  114 
  115 #ifdef _KERNEL
  116 #define SYSCTL_HANDLER_ARGS struct sysctl_oid *oidp, void *arg1, int arg2, \
  117         struct sysctl_req *req
  118 
  119 /* definitions for sysctl_req 'lock' member */
  120 #define REQ_UNLOCKED    0       /* not locked and not wired */
  121 #define REQ_LOCKED      1       /* locked and not wired */
  122 #define REQ_WIRED       2       /* locked and wired */
  123 
  124 /* definitions for sysctl_req 'flags' member */
  125 #if defined(__amd64__) || defined(__ia64__)
  126 #define SCTL_MASK32     1       /* 32 bit emulation */
  127 #endif
  128 
  129 /*
  130  * This describes the access space for a sysctl request.  This is needed
  131  * so that we can use the interface from the kernel or from user-space.
  132  */
  133 struct sysctl_req {
  134         struct thread   *td;            /* used for access checking */
  135         int             lock;           /* locking/wiring state */
  136         void            *oldptr;
  137         size_t          oldlen;
  138         size_t          oldidx;
  139         int             (*oldfunc)(struct sysctl_req *, const void *, size_t);
  140         void            *newptr;
  141         size_t          newlen;
  142         size_t          newidx;
  143         int             (*newfunc)(struct sysctl_req *, void *, size_t);
  144         size_t          validlen;
  145         int             flags;
  146 };
  147 
  148 SLIST_HEAD(sysctl_oid_list, sysctl_oid);
  149 
  150 /*
  151  * This describes one "oid" in the MIB tree.  Potentially more nodes can
  152  * be hidden behind it, expanded by the handler.
  153  */
  154 struct sysctl_oid {
  155         struct sysctl_oid_list *oid_parent;
  156         SLIST_ENTRY(sysctl_oid) oid_link;
  157         int             oid_number;
  158         u_int           oid_kind;
  159         void            *oid_arg1;
  160         int             oid_arg2;
  161         const char      *oid_name;
  162         int             (*oid_handler)(SYSCTL_HANDLER_ARGS);
  163         const char      *oid_fmt;
  164         int             oid_refcnt;
  165         const char      *oid_descr;
  166 };
  167 
  168 #define SYSCTL_IN(r, p, l) (r->newfunc)(r, p, l)
  169 #define SYSCTL_OUT(r, p, l) (r->oldfunc)(r, p, l)
  170 
  171 int sysctl_handle_int(SYSCTL_HANDLER_ARGS);
  172 int sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS);
  173 int sysctl_handle_long(SYSCTL_HANDLER_ARGS);
  174 int sysctl_handle_quad(SYSCTL_HANDLER_ARGS);
  175 int sysctl_handle_intptr(SYSCTL_HANDLER_ARGS);
  176 int sysctl_handle_string(SYSCTL_HANDLER_ARGS);
  177 int sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
  178 
  179 /*
  180  * These functions are used to add/remove an oid from the mib.
  181  */
  182 void sysctl_register_oid(struct sysctl_oid *oidp);
  183 void sysctl_unregister_oid(struct sysctl_oid *oidp);
  184 
  185 /* Declare a static oid to allow child oids to be added to it. */
  186 #define SYSCTL_DECL(name)                                       \
  187         extern struct sysctl_oid_list sysctl_##name##_children
  188 
  189 /* Hide these in macros */
  190 #define SYSCTL_CHILDREN(oid_ptr) (struct sysctl_oid_list *) \
  191         (oid_ptr)->oid_arg1
  192 #define SYSCTL_CHILDREN_SET(oid_ptr, val) \
  193         (oid_ptr)->oid_arg1 = (val);
  194 #define SYSCTL_STATIC_CHILDREN(oid_name) \
  195         (&sysctl_##oid_name##_children)
  196 
  197 /* === Structs and macros related to context handling === */
  198 
  199 /* All dynamically created sysctls can be tracked in a context list. */
  200 struct sysctl_ctx_entry {
  201         struct sysctl_oid *entry;
  202         TAILQ_ENTRY(sysctl_ctx_entry) link;
  203 };
  204 
  205 TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
  206 
  207 #define SYSCTL_NODE_CHILDREN(parent, name) \
  208         sysctl_##parent##_##name##_children
  209 
  210 #ifndef NO_SYSCTL_DESCR
  211 #define __DESCR(d) d
  212 #else
  213 #define __DESCR(d) ""
  214 #endif
  215 
  216 /* This constructs a "raw" MIB oid. */
  217 #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
  218         static struct sysctl_oid sysctl__##parent##_##name = {           \
  219                 &sysctl_##parent##_children, { 0 },                      \
  220                 nbr, kind, a1, a2, #name, handler, fmt, 0, __DESCR(descr) }; \
  221         DATA_SET(sysctl_set, sysctl__##parent##_##name)
  222 
  223 #define SYSCTL_ADD_OID(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
  224         sysctl_add_oid(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, __DESCR(descr))
  225 
  226 /* This constructs a node from which other oids can hang. */
  227 #define SYSCTL_NODE(parent, nbr, name, access, handler, descr)              \
  228         struct sysctl_oid_list SYSCTL_NODE_CHILDREN(parent, name);          \
  229         SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|(access),                \
  230                    (void*)&SYSCTL_NODE_CHILDREN(parent, name), 0, handler, \
  231                    "N", descr)
  232 
  233 #define SYSCTL_ADD_NODE(ctx, parent, nbr, name, access, handler, descr)     \
  234         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|(access),       \
  235         0, 0, handler, "N", __DESCR(descr))
  236 
  237 /* Oid for a string.  len can be 0 to indicate '\0' termination. */
  238 #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) \
  239         SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), \
  240                 arg, len, sysctl_handle_string, "A", descr)
  241 
  242 #define SYSCTL_ADD_STRING(ctx, parent, nbr, name, access, arg, len, descr)  \
  243         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_STRING|(access),     \
  244         arg, len, sysctl_handle_string, "A", __DESCR(descr))
  245 
  246 /* Oid for an int.  If ptr is NULL, val is returned. */
  247 #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr) \
  248         SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|CTLFLAG_MPSAFE|(access), \
  249                 ptr, val, sysctl_handle_int, "I", descr)
  250 
  251 #define SYSCTL_ADD_INT(ctx, parent, nbr, name, access, ptr, val, descr)     \
  252         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_INT|CTLFLAG_MPSAFE|(access),         \
  253         ptr, val, sysctl_handle_int, "I", __DESCR(descr))
  254 
  255 /* Oid for an unsigned int.  If ptr is NULL, val is returned. */
  256 #define SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr) \
  257         SYSCTL_OID(parent, nbr, name, CTLTYPE_UINT|CTLFLAG_MPSAFE|(access), \
  258                 ptr, val, sysctl_handle_int, "IU", descr)
  259 
  260 #define SYSCTL_ADD_UINT(ctx, parent, nbr, name, access, ptr, val, descr)    \
  261         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_UINT|CTLFLAG_MPSAFE|(access),        \
  262         ptr, val, sysctl_handle_int, "IU", __DESCR(descr))
  263 
  264 #define SYSCTL_XINT(parent, nbr, name, access, ptr, val, descr) \
  265         SYSCTL_OID(parent, nbr, name, CTLTYPE_UINT|CTLFLAG_MPSAFE|(access), \
  266                 ptr, val, sysctl_handle_int, "IX", descr)
  267 
  268 #define SYSCTL_ADD_XINT(ctx, parent, nbr, name, access, ptr, val, descr)    \
  269         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_UINT|CTLFLAG_MPSAFE|(access),        \
  270         ptr, val, sysctl_handle_int, "IX", __DESCR(descr))
  271 
  272 /* Oid for a long.  The pointer must be non NULL. */
  273 #define SYSCTL_LONG(parent, nbr, name, access, ptr, val, descr) \
  274         SYSCTL_OID(parent, nbr, name, CTLTYPE_LONG|CTLFLAG_MPSAFE|(access), \
  275                 ptr, val, sysctl_handle_long, "L", descr)
  276 
  277 #define SYSCTL_ADD_LONG(ctx, parent, nbr, name, access, ptr, descr)         \
  278         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_LONG|CTLFLAG_MPSAFE|(access),        \
  279         ptr, 0, sysctl_handle_long, "L", __DESCR(descr))
  280 
  281 /* Oid for an unsigned long.  The pointer must be non NULL. */
  282 #define SYSCTL_ULONG(parent, nbr, name, access, ptr, val, descr) \
  283         SYSCTL_OID(parent, nbr, name, CTLTYPE_ULONG|CTLFLAG_MPSAFE|(access), \
  284                 ptr, val, sysctl_handle_long, "LU", __DESCR(descr))
  285 
  286 #define SYSCTL_ADD_ULONG(ctx, parent, nbr, name, access, ptr, descr)        \
  287         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_ULONG|CTLFLAG_MPSAFE|(access),       \
  288         ptr, 0, sysctl_handle_long, "LU", __DESCR(descr))
  289 
  290 #define SYSCTL_XLONG(parent, nbr, name, access, ptr, val, descr) \
  291         SYSCTL_OID(parent, nbr, name, CTLTYPE_ULONG|CTLFLAG_MPSAFE|(access), \
  292                 ptr, val, sysctl_handle_long, "LX", __DESCR(descr))
  293 
  294 #define SYSCTL_ADD_XLONG(ctx, parent, nbr, name, access, ptr, descr)        \
  295         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_ULONG|CTLFLAG_MPSAFE|(access),       \
  296         ptr, 0, sysctl_handle_long, "LX", __DESCR(descr))
  297 
  298 /* Oid for an opaque object.  Specified by a pointer and a length. */
  299 #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr) \
  300         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), \
  301                 ptr, len, sysctl_handle_opaque, fmt, descr)
  302 
  303 #define SYSCTL_ADD_OPAQUE(ctx, parent, nbr, name, access, ptr, len, fmt, descr)\
  304         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access),     \
  305         ptr, len, sysctl_handle_opaque, fmt, __DESCR(descr))
  306 
  307 /* Oid for a struct.  Specified by a pointer and a type. */
  308 #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) \
  309         SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), \
  310                 ptr, sizeof(struct type), sysctl_handle_opaque, \
  311                 "S," #type, descr)
  312 
  313 #define SYSCTL_ADD_STRUCT(ctx, parent, nbr, name, access, ptr, type, descr) \
  314         sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access),     \
  315         ptr, sizeof(struct type), sysctl_handle_opaque, "S," #type, __DESCR(descr))
  316 
  317 /* Oid for a procedure.  Specified by a pointer and an arg. */
  318 #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
  319         SYSCTL_OID(parent, nbr, name, (access), \
  320                 ptr, arg, handler, fmt, descr)
  321 
  322 #define SYSCTL_ADD_PROC(ctx, parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
  323         sysctl_add_oid(ctx, parent, nbr, name, (access),                            \
  324         ptr, arg, handler, fmt, __DESCR(descr))
  325 
  326 /*
  327  * A macro to generate a read-only sysctl to indicate the presense of optional
  328  * kernel features.
  329  */
  330 #define FEATURE(name, desc)                                             \
  331         SYSCTL_INT(_kern_features, OID_AUTO, name, CTLFLAG_RD, 0, 1, desc)
  332         
  333 #endif /* _KERNEL */
  334 
  335 /*
  336  * Top-level identifiers
  337  */
  338 #define CTL_UNSPEC      0               /* unused */
  339 #define CTL_KERN        1               /* "high kernel": proc, limits */
  340 #define CTL_VM          2               /* virtual memory */
  341 #define CTL_VFS         3               /* filesystem, mount type is next */
  342 #define CTL_NET         4               /* network, see socket.h */
  343 #define CTL_DEBUG       5               /* debugging parameters */
  344 #define CTL_HW          6               /* generic cpu/io */
  345 #define CTL_MACHDEP     7               /* machine dependent */
  346 #define CTL_USER        8               /* user-level */
  347 #define CTL_P1003_1B    9               /* POSIX 1003.1B */
  348 #define CTL_MAXID       10              /* number of valid top-level ids */
  349 
  350 #define CTL_NAMES { \
  351         { 0, 0 }, \
  352         { "kern", CTLTYPE_NODE }, \
  353         { "vm", CTLTYPE_NODE }, \
  354         { "vfs", CTLTYPE_NODE }, \
  355         { "net", CTLTYPE_NODE }, \
  356         { "debug", CTLTYPE_NODE }, \
  357         { "hw", CTLTYPE_NODE }, \
  358         { "machdep", CTLTYPE_NODE }, \
  359         { "user", CTLTYPE_NODE }, \
  360         { "p1003_1b", CTLTYPE_NODE }, \
  361 }
  362 
  363 /*
  364  * CTL_KERN identifiers
  365  */
  366 #define KERN_OSTYPE              1      /* string: system version */
  367 #define KERN_OSRELEASE           2      /* string: system release */
  368 #define KERN_OSREV               3      /* int: system revision */
  369 #define KERN_VERSION             4      /* string: compile time info */
  370 #define KERN_MAXVNODES           5      /* int: max vnodes */
  371 #define KERN_MAXPROC             6      /* int: max processes */
  372 #define KERN_MAXFILES            7      /* int: max open files */
  373 #define KERN_ARGMAX              8      /* int: max arguments to exec */
  374 #define KERN_SECURELVL           9      /* int: system security level */
  375 #define KERN_HOSTNAME           10      /* string: hostname */
  376 #define KERN_HOSTID             11      /* int: host identifier */
  377 #define KERN_CLOCKRATE          12      /* struct: struct clockrate */
  378 #define KERN_VNODE              13      /* struct: vnode structures */
  379 #define KERN_PROC               14      /* struct: process entries */
  380 #define KERN_FILE               15      /* struct: file entries */
  381 #define KERN_PROF               16      /* node: kernel profiling info */
  382 #define KERN_POSIX1             17      /* int: POSIX.1 version */
  383 #define KERN_NGROUPS            18      /* int: # of supplemental group ids */
  384 #define KERN_JOB_CONTROL        19      /* int: is job control available */
  385 #define KERN_SAVED_IDS          20      /* int: saved set-user/group-ID */
  386 #define KERN_BOOTTIME           21      /* struct: time kernel was booted */
  387 #define KERN_NISDOMAINNAME      22      /* string: YP domain name */
  388 #define KERN_UPDATEINTERVAL     23      /* int: update process sleep time */
  389 #define KERN_OSRELDATE          24      /* int: kernel release date */
  390 #define KERN_NTP_PLL            25      /* node: NTP PLL control */
  391 #define KERN_BOOTFILE           26      /* string: name of booted kernel */
  392 #define KERN_MAXFILESPERPROC    27      /* int: max open files per proc */
  393 #define KERN_MAXPROCPERUID      28      /* int: max processes per uid */
  394 #define KERN_DUMPDEV            29      /* struct cdev *: device to dump on */
  395 #define KERN_IPC                30      /* node: anything related to IPC */
  396 #define KERN_DUMMY              31      /* unused */
  397 #define KERN_PS_STRINGS         32      /* int: address of PS_STRINGS */
  398 #define KERN_USRSTACK           33      /* int: address of USRSTACK */
  399 #define KERN_LOGSIGEXIT         34      /* int: do we log sigexit procs? */
  400 #define KERN_IOV_MAX            35      /* int: value of UIO_MAXIOV */
  401 #define KERN_HOSTUUID           36      /* string: host UUID identifier */
  402 #define KERN_ARND               37      /* int: from arc4rand() */
  403 #define KERN_MAXID              38      /* number of valid kern ids */
  404 
  405 #define CTL_KERN_NAMES { \
  406         { 0, 0 }, \
  407         { "ostype", CTLTYPE_STRING }, \
  408         { "osrelease", CTLTYPE_STRING }, \
  409         { "osrevision", CTLTYPE_INT }, \
  410         { "version", CTLTYPE_STRING }, \
  411         { "maxvnodes", CTLTYPE_INT }, \
  412         { "maxproc", CTLTYPE_INT }, \
  413         { "maxfiles", CTLTYPE_INT }, \
  414         { "argmax", CTLTYPE_INT }, \
  415         { "securelevel", CTLTYPE_INT }, \
  416         { "hostname", CTLTYPE_STRING }, \
  417         { "hostid", CTLTYPE_UINT }, \
  418         { "clockrate", CTLTYPE_STRUCT }, \
  419         { "vnode", CTLTYPE_STRUCT }, \
  420         { "proc", CTLTYPE_STRUCT }, \
  421         { "file", CTLTYPE_STRUCT }, \
  422         { "profiling", CTLTYPE_NODE }, \
  423         { "posix1version", CTLTYPE_INT }, \
  424         { "ngroups", CTLTYPE_INT }, \
  425         { "job_control", CTLTYPE_INT }, \
  426         { "saved_ids", CTLTYPE_INT }, \
  427         { "boottime", CTLTYPE_STRUCT }, \
  428         { "nisdomainname", CTLTYPE_STRING }, \
  429         { "update", CTLTYPE_INT }, \
  430         { "osreldate", CTLTYPE_INT }, \
  431         { "ntp_pll", CTLTYPE_NODE }, \
  432         { "bootfile", CTLTYPE_STRING }, \
  433         { "maxfilesperproc", CTLTYPE_INT }, \
  434         { "maxprocperuid", CTLTYPE_INT }, \
  435         { "ipc", CTLTYPE_NODE }, \
  436         { "dummy", CTLTYPE_INT }, \
  437         { "ps_strings", CTLTYPE_INT }, \
  438         { "usrstack", CTLTYPE_INT }, \
  439         { "logsigexit", CTLTYPE_INT }, \
  440         { "iov_max", CTLTYPE_INT }, \
  441         { "hostuuid", CTLTYPE_STRING }, \
  442 }
  443 
  444 /*
  445  * CTL_VFS identifiers
  446  */
  447 #define CTL_VFS_NAMES { \
  448         { "vfsconf", CTLTYPE_STRUCT }, \
  449 }
  450 
  451 /*
  452  * KERN_PROC subtypes
  453  */
  454 #define KERN_PROC_ALL           0       /* everything */
  455 #define KERN_PROC_PID           1       /* by process id */
  456 #define KERN_PROC_PGRP          2       /* by process group id */
  457 #define KERN_PROC_SESSION       3       /* by session of pid */
  458 #define KERN_PROC_TTY           4       /* by controlling tty */
  459 #define KERN_PROC_UID           5       /* by effective uid */
  460 #define KERN_PROC_RUID          6       /* by real uid */
  461 #define KERN_PROC_ARGS          7       /* get/set arguments/proctitle */
  462 #define KERN_PROC_PROC          8       /* only return procs */
  463 #define KERN_PROC_SV_NAME       9       /* get syscall vector name */
  464 #define KERN_PROC_RGID          10      /* by real group id */
  465 #define KERN_PROC_GID           11      /* by effective group id */
  466 #define KERN_PROC_PATHNAME      12      /* path to executable */
  467 #define KERN_PROC_OVMMAP        13      /* Old VM map entries for process */
  468 #define KERN_PROC_OFILEDESC     14      /* Old file descriptors for process */
  469 #define KERN_PROC_KSTACK        15      /* Kernel stacks for process */
  470 #define KERN_PROC_INC_THREAD    0x10    /*
  471                                          * modifier for pid, pgrp, tty,
  472                                          * uid, ruid, gid, rgid and proc
  473                                          * This effectively uses 16-31
  474                                          */
  475 #define KERN_PROC_VMMAP         32      /* VM map entries for process */
  476 #define KERN_PROC_FILEDESC      33      /* File descriptors for process */
  477 
  478 /*
  479  * KERN_IPC identifiers
  480  */
  481 #define KIPC_MAXSOCKBUF         1       /* int: max size of a socket buffer */
  482 #define KIPC_SOCKBUF_WASTE      2       /* int: wastage factor in sockbuf */
  483 #define KIPC_SOMAXCONN          3       /* int: max length of connection q */
  484 #define KIPC_MAX_LINKHDR        4       /* int: max length of link header */
  485 #define KIPC_MAX_PROTOHDR       5       /* int: max length of network header */
  486 #define KIPC_MAX_HDR            6       /* int: max total length of headers */
  487 #define KIPC_MAX_DATALEN        7       /* int: max length of data? */
  488 
  489 /*
  490  * CTL_HW identifiers
  491  */
  492 #define HW_MACHINE       1              /* string: machine class */
  493 #define HW_MODEL         2              /* string: specific machine model */
  494 #define HW_NCPU          3              /* int: number of cpus */
  495 #define HW_BYTEORDER     4              /* int: machine byte order */
  496 #define HW_PHYSMEM       5              /* int: total memory */
  497 #define HW_USERMEM       6              /* int: non-kernel memory */
  498 #define HW_PAGESIZE      7              /* int: software page size */
  499 #define HW_DISKNAMES     8              /* strings: disk drive names */
  500 #define HW_DISKSTATS     9              /* struct: diskstats[] */
  501 #define HW_FLOATINGPT   10              /* int: has HW floating point? */
  502 #define HW_MACHINE_ARCH 11              /* string: machine architecture */
  503 #define HW_REALMEM      12              /* int: 'real' memory */
  504 #define HW_MAXID        13              /* number of valid hw ids */
  505 
  506 #define CTL_HW_NAMES { \
  507         { 0, 0 }, \
  508         { "machine", CTLTYPE_STRING }, \
  509         { "model", CTLTYPE_STRING }, \
  510         { "ncpu", CTLTYPE_INT }, \
  511         { "byteorder", CTLTYPE_INT }, \
  512         { "physmem", CTLTYPE_ULONG }, \
  513         { "usermem", CTLTYPE_ULONG }, \
  514         { "pagesize", CTLTYPE_INT }, \
  515         { "disknames", CTLTYPE_STRUCT }, \
  516         { "diskstats", CTLTYPE_STRUCT }, \
  517         { "floatingpoint", CTLTYPE_INT }, \
  518         { "realmem", CTLTYPE_ULONG }, \
  519 }
  520 
  521 /*
  522  * CTL_USER definitions
  523  */
  524 #define USER_CS_PATH             1      /* string: _CS_PATH */
  525 #define USER_BC_BASE_MAX         2      /* int: BC_BASE_MAX */
  526 #define USER_BC_DIM_MAX          3      /* int: BC_DIM_MAX */
  527 #define USER_BC_SCALE_MAX        4      /* int: BC_SCALE_MAX */
  528 #define USER_BC_STRING_MAX       5      /* int: BC_STRING_MAX */
  529 #define USER_COLL_WEIGHTS_MAX    6      /* int: COLL_WEIGHTS_MAX */
  530 #define USER_EXPR_NEST_MAX       7      /* int: EXPR_NEST_MAX */
  531 #define USER_LINE_MAX            8      /* int: LINE_MAX */
  532 #define USER_RE_DUP_MAX          9      /* int: RE_DUP_MAX */
  533 #define USER_POSIX2_VERSION     10      /* int: POSIX2_VERSION */
  534 #define USER_POSIX2_C_BIND      11      /* int: POSIX2_C_BIND */
  535 #define USER_POSIX2_C_DEV       12      /* int: POSIX2_C_DEV */
  536 #define USER_POSIX2_CHAR_TERM   13      /* int: POSIX2_CHAR_TERM */
  537 #define USER_POSIX2_FORT_DEV    14      /* int: POSIX2_FORT_DEV */
  538 #define USER_POSIX2_FORT_RUN    15      /* int: POSIX2_FORT_RUN */
  539 #define USER_POSIX2_LOCALEDEF   16      /* int: POSIX2_LOCALEDEF */
  540 #define USER_POSIX2_SW_DEV      17      /* int: POSIX2_SW_DEV */
  541 #define USER_POSIX2_UPE         18      /* int: POSIX2_UPE */
  542 #define USER_STREAM_MAX         19      /* int: POSIX2_STREAM_MAX */
  543 #define USER_TZNAME_MAX         20      /* int: POSIX2_TZNAME_MAX */
  544 #define USER_MAXID              21      /* number of valid user ids */
  545 
  546 #define CTL_USER_NAMES { \
  547         { 0, 0 }, \
  548         { "cs_path", CTLTYPE_STRING }, \
  549         { "bc_base_max", CTLTYPE_INT }, \
  550         { "bc_dim_max", CTLTYPE_INT }, \
  551         { "bc_scale_max", CTLTYPE_INT }, \
  552         { "bc_string_max", CTLTYPE_INT }, \
  553         { "coll_weights_max", CTLTYPE_INT }, \
  554         { "expr_nest_max", CTLTYPE_INT }, \
  555         { "line_max", CTLTYPE_INT }, \
  556         { "re_dup_max", CTLTYPE_INT }, \
  557         { "posix2_version", CTLTYPE_INT }, \
  558         { "posix2_c_bind", CTLTYPE_INT }, \
  559         { "posix2_c_dev", CTLTYPE_INT }, \
  560         { "posix2_char_term", CTLTYPE_INT }, \
  561         { "posix2_fort_dev", CTLTYPE_INT }, \
  562         { "posix2_fort_run", CTLTYPE_INT }, \
  563         { "posix2_localedef", CTLTYPE_INT }, \
  564         { "posix2_sw_dev", CTLTYPE_INT }, \
  565         { "posix2_upe", CTLTYPE_INT }, \
  566         { "stream_max", CTLTYPE_INT }, \
  567         { "tzname_max", CTLTYPE_INT }, \
  568 }
  569 
  570 #define CTL_P1003_1B_ASYNCHRONOUS_IO            1       /* boolean */
  571 #define CTL_P1003_1B_MAPPED_FILES               2       /* boolean */
  572 #define CTL_P1003_1B_MEMLOCK                    3       /* boolean */
  573 #define CTL_P1003_1B_MEMLOCK_RANGE              4       /* boolean */
  574 #define CTL_P1003_1B_MEMORY_PROTECTION          5       /* boolean */
  575 #define CTL_P1003_1B_MESSAGE_PASSING            6       /* boolean */
  576 #define CTL_P1003_1B_PRIORITIZED_IO             7       /* boolean */
  577 #define CTL_P1003_1B_PRIORITY_SCHEDULING        8       /* boolean */
  578 #define CTL_P1003_1B_REALTIME_SIGNALS           9       /* boolean */
  579 #define CTL_P1003_1B_SEMAPHORES                 10      /* boolean */
  580 #define CTL_P1003_1B_FSYNC                      11      /* boolean */
  581 #define CTL_P1003_1B_SHARED_MEMORY_OBJECTS      12      /* boolean */
  582 #define CTL_P1003_1B_SYNCHRONIZED_IO            13      /* boolean */
  583 #define CTL_P1003_1B_TIMERS                     14      /* boolean */
  584 #define CTL_P1003_1B_AIO_LISTIO_MAX             15      /* int */
  585 #define CTL_P1003_1B_AIO_MAX                    16      /* int */
  586 #define CTL_P1003_1B_AIO_PRIO_DELTA_MAX         17      /* int */
  587 #define CTL_P1003_1B_DELAYTIMER_MAX             18      /* int */
  588 #define CTL_P1003_1B_MQ_OPEN_MAX                19      /* int */
  589 #define CTL_P1003_1B_PAGESIZE                   20      /* int */
  590 #define CTL_P1003_1B_RTSIG_MAX                  21      /* int */
  591 #define CTL_P1003_1B_SEM_NSEMS_MAX              22      /* int */
  592 #define CTL_P1003_1B_SEM_VALUE_MAX              23      /* int */
  593 #define CTL_P1003_1B_SIGQUEUE_MAX               24      /* int */
  594 #define CTL_P1003_1B_TIMER_MAX                  25      /* int */
  595 
  596 #define CTL_P1003_1B_MAXID              26
  597 
  598 #define CTL_P1003_1B_NAMES { \
  599         { 0, 0 }, \
  600         { "asynchronous_io", CTLTYPE_INT }, \
  601         { "mapped_files", CTLTYPE_INT }, \
  602         { "memlock", CTLTYPE_INT }, \
  603         { "memlock_range", CTLTYPE_INT }, \
  604         { "memory_protection", CTLTYPE_INT }, \
  605         { "message_passing", CTLTYPE_INT }, \
  606         { "prioritized_io", CTLTYPE_INT }, \
  607         { "priority_scheduling", CTLTYPE_INT }, \
  608         { "realtime_signals", CTLTYPE_INT }, \
  609         { "semaphores", CTLTYPE_INT }, \
  610         { "fsync", CTLTYPE_INT }, \
  611         { "shared_memory_objects", CTLTYPE_INT }, \
  612         { "synchronized_io", CTLTYPE_INT }, \
  613         { "timers", CTLTYPE_INT }, \
  614         { "aio_listio_max", CTLTYPE_INT }, \
  615         { "aio_max", CTLTYPE_INT }, \
  616         { "aio_prio_delta_max", CTLTYPE_INT }, \
  617         { "delaytimer_max", CTLTYPE_INT }, \
  618         { "mq_open_max", CTLTYPE_INT }, \
  619         { "pagesize", CTLTYPE_INT }, \
  620         { "rtsig_max", CTLTYPE_INT }, \
  621         { "nsems_max", CTLTYPE_INT }, \
  622         { "sem_value_max", CTLTYPE_INT }, \
  623         { "sigqueue_max", CTLTYPE_INT }, \
  624         { "timer_max", CTLTYPE_INT }, \
  625 }
  626 
  627 #ifdef _KERNEL
  628 
  629 /*
  630  * Declare some common oids.
  631  */
  632 extern struct sysctl_oid_list sysctl__children;
  633 SYSCTL_DECL(_kern);
  634 SYSCTL_DECL(_kern_features);
  635 SYSCTL_DECL(_kern_ipc);
  636 SYSCTL_DECL(_kern_proc);
  637 SYSCTL_DECL(_sysctl);
  638 SYSCTL_DECL(_vm);
  639 SYSCTL_DECL(_vm_stats);
  640 SYSCTL_DECL(_vm_stats_misc);
  641 SYSCTL_DECL(_vfs);
  642 SYSCTL_DECL(_net);
  643 SYSCTL_DECL(_debug);
  644 SYSCTL_DECL(_debug_sizeof);
  645 SYSCTL_DECL(_hw);
  646 SYSCTL_DECL(_hw_bus);
  647 SYSCTL_DECL(_machdep);
  648 SYSCTL_DECL(_user);
  649 SYSCTL_DECL(_compat);
  650 SYSCTL_DECL(_regression);
  651 SYSCTL_DECL(_security);
  652 SYSCTL_DECL(_security_bsd);
  653 
  654 extern char     machine[];
  655 extern char     osrelease[];
  656 extern char     ostype[];
  657 extern char     kern_ident[];
  658 
  659 /* Dynamic oid handling */
  660 struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist,
  661                 struct sysctl_oid_list *parent, int nbr, const char *name,
  662                 int kind, void *arg1, int arg2,
  663                 int (*handler) (SYSCTL_HANDLER_ARGS),
  664                 const char *fmt, const char *descr);
  665 void    sysctl_rename_oid(struct sysctl_oid *oidp, const char *name);
  666 int     sysctl_move_oid(struct sysctl_oid *oidp,
  667                 struct sysctl_oid_list *parent);
  668 int     sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse);
  669 int     sysctl_ctx_init(struct sysctl_ctx_list *clist);
  670 int     sysctl_ctx_free(struct sysctl_ctx_list *clist);
  671 struct  sysctl_ctx_entry *sysctl_ctx_entry_add(struct sysctl_ctx_list *clist,
  672                 struct sysctl_oid *oidp);
  673 struct  sysctl_ctx_entry *sysctl_ctx_entry_find(struct sysctl_ctx_list *clist,
  674                 struct sysctl_oid *oidp);
  675 int     sysctl_ctx_entry_del(struct sysctl_ctx_list *clist,
  676                 struct sysctl_oid *oidp);
  677 
  678 int     kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
  679                       size_t *oldlenp, void *new, size_t newlen,
  680                       size_t *retval, int flags);
  681 int     kernel_sysctlbyname(struct thread *td, char *name,
  682                 void *old, size_t *oldlenp, void *new, size_t newlen,
  683                 size_t *retval, int flags);
  684 int     userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
  685                         size_t *oldlenp, int inkernel, void *new, size_t newlen,
  686                         size_t *retval, int flags);
  687 int     sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
  688                         int *nindx, struct sysctl_req *req);
  689 void    sysctl_lock(void);
  690 void    sysctl_unlock(void);
  691 int     sysctl_wire_old_buffer(struct sysctl_req *req, size_t len);
  692 
  693 #else   /* !_KERNEL */
  694 #include <sys/cdefs.h>
  695 
  696 __BEGIN_DECLS
  697 int     sysctl(int *, u_int, void *, size_t *, void *, size_t);
  698 int     sysctlbyname(const char *, void *, size_t *, void *, size_t);
  699 int     sysctlnametomib(const char *, int *, size_t *);
  700 __END_DECLS
  701 #endif  /* _KERNEL */
  702 
  703 #endif  /* !_SYS_SYSCTL_H_ */

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