Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/sysctl.h
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1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Mike Karels at Berkeley Software Design, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)sysctl.h 8.1 (Berkeley) 6/2/93 33 * $FreeBSD: releng/10.1/sys/sys/sysctl.h 269446 2014-08-02 20:58:46Z hselasky $ 34 */ 35 36 #ifndef _SYS_SYSCTL_H_ 37 #define _SYS_SYSCTL_H_ 38 39 #include <sys/queue.h> 40 41 struct thread; 42 /* 43 * Definitions for sysctl call. The sysctl call uses a hierarchical name 44 * for objects that can be examined or modified. The name is expressed as 45 * a sequence of integers. Like a file path name, the meaning of each 46 * component depends on its place in the hierarchy. The top-level and kern 47 * identifiers are defined here, and other identifiers are defined in the 48 * respective subsystem header files. 49 */ 50 51 #define CTL_MAXNAME 24 /* largest number of components supported */ 52 53 /* 54 * Each subsystem defined by sysctl defines a list of variables 55 * for that subsystem. Each name is either a node with further 56 * levels defined below it, or it is a leaf of some particular 57 * type given below. Each sysctl level defines a set of name/type 58 * pairs to be used by sysctl(8) in manipulating the subsystem. 59 */ 60 struct ctlname { 61 char *ctl_name; /* subsystem name */ 62 int ctl_type; /* type of name */ 63 }; 64 65 #define CTLTYPE 0xf /* mask for the type */ 66 #define CTLTYPE_NODE 1 /* name is a node */ 67 #define CTLTYPE_INT 2 /* name describes an integer */ 68 #define CTLTYPE_STRING 3 /* name describes a string */ 69 #define CTLTYPE_S64 4 /* name describes a signed 64-bit number */ 70 #define CTLTYPE_OPAQUE 5 /* name describes a structure */ 71 #define CTLTYPE_STRUCT CTLTYPE_OPAQUE /* name describes a structure */ 72 #define CTLTYPE_UINT 6 /* name describes an unsigned integer */ 73 #define CTLTYPE_LONG 7 /* name describes a long */ 74 #define CTLTYPE_ULONG 8 /* name describes an unsigned long */ 75 #define CTLTYPE_U64 9 /* name describes an unsigned 64-bit number */ 76 77 #define CTLFLAG_RD 0x80000000 /* Allow reads of variable */ 78 #define CTLFLAG_WR 0x40000000 /* Allow writes to the variable */ 79 #define CTLFLAG_RW (CTLFLAG_RD|CTLFLAG_WR) 80 #define CTLFLAG_ANYBODY 0x10000000 /* All users can set this var */ 81 #define CTLFLAG_SECURE 0x08000000 /* Permit set only if securelevel<=0 */ 82 #define CTLFLAG_PRISON 0x04000000 /* Prisoned roots can fiddle */ 83 #define CTLFLAG_DYN 0x02000000 /* Dynamic oid - can be freed */ 84 #define CTLFLAG_SKIP 0x01000000 /* Skip this sysctl when listing */ 85 #define CTLMASK_SECURE 0x00F00000 /* Secure level */ 86 #define CTLFLAG_TUN 0x00080000 /* Tunable variable */ 87 #define CTLFLAG_RDTUN (CTLFLAG_RD|CTLFLAG_TUN) 88 #define CTLFLAG_RWTUN (CTLFLAG_RW|CTLFLAG_TUN) 89 #define CTLFLAG_MPSAFE 0x00040000 /* Handler is MP safe */ 90 #define CTLFLAG_VNET 0x00020000 /* Prisons with vnet can fiddle */ 91 #define CTLFLAG_DYING 0x00010000 /* Oid is being removed */ 92 #define CTLFLAG_CAPRD 0x00008000 /* Can be read in capability mode */ 93 #define CTLFLAG_CAPWR 0x00004000 /* Can be written in capability mode */ 94 #define CTLFLAG_STATS 0x00002000 /* Statistics, not a tuneable */ 95 #define CTLFLAG_NOFETCH 0x00001000 /* Don't fetch tunable from getenv() */ 96 #define CTLFLAG_CAPRW (CTLFLAG_CAPRD|CTLFLAG_CAPWR) 97 98 /* 99 * Secure level. Note that CTLFLAG_SECURE == CTLFLAG_SECURE1. 100 * 101 * Secure when the securelevel is raised to at least N. 102 */ 103 #define CTLSHIFT_SECURE 20 104 #define CTLFLAG_SECURE1 (CTLFLAG_SECURE | (0 << CTLSHIFT_SECURE)) 105 #define CTLFLAG_SECURE2 (CTLFLAG_SECURE | (1 << CTLSHIFT_SECURE)) 106 #define CTLFLAG_SECURE3 (CTLFLAG_SECURE | (2 << CTLSHIFT_SECURE)) 107 108 /* 109 * USE THIS instead of a hardwired number from the categories below 110 * to get dynamically assigned sysctl entries using the linker-set 111 * technology. This is the way nearly all new sysctl variables should 112 * be implemented. 113 * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, ""); 114 */ 115 #define OID_AUTO (-1) 116 117 /* 118 * The starting number for dynamically-assigned entries. WARNING! 119 * ALL static sysctl entries should have numbers LESS than this! 120 */ 121 #define CTL_AUTO_START 0x100 122 123 #ifdef _KERNEL 124 #include <sys/linker_set.h> 125 126 #define SYSCTL_HANDLER_ARGS struct sysctl_oid *oidp, void *arg1, \ 127 intptr_t arg2, struct sysctl_req *req 128 129 /* definitions for sysctl_req 'lock' member */ 130 #define REQ_UNWIRED 1 131 #define REQ_WIRED 2 132 133 /* definitions for sysctl_req 'flags' member */ 134 #if defined(__amd64__) || defined(__ia64__) || defined(__powerpc64__) ||\ 135 (defined(__mips__) && defined(__mips_n64)) 136 #define SCTL_MASK32 1 /* 32 bit emulation */ 137 #endif 138 139 /* 140 * This describes the access space for a sysctl request. This is needed 141 * so that we can use the interface from the kernel or from user-space. 142 */ 143 struct sysctl_req { 144 struct thread *td; /* used for access checking */ 145 int lock; /* wiring state */ 146 void *oldptr; 147 size_t oldlen; 148 size_t oldidx; 149 int (*oldfunc)(struct sysctl_req *, const void *, size_t); 150 void *newptr; 151 size_t newlen; 152 size_t newidx; 153 int (*newfunc)(struct sysctl_req *, void *, size_t); 154 size_t validlen; 155 int flags; 156 }; 157 158 SLIST_HEAD(sysctl_oid_list, sysctl_oid); 159 160 /* 161 * This describes one "oid" in the MIB tree. Potentially more nodes can 162 * be hidden behind it, expanded by the handler. 163 */ 164 struct sysctl_oid { 165 struct sysctl_oid_list *oid_parent; 166 SLIST_ENTRY(sysctl_oid) oid_link; 167 int oid_number; 168 u_int oid_kind; 169 void *oid_arg1; 170 intptr_t oid_arg2; 171 const char *oid_name; 172 int (*oid_handler)(SYSCTL_HANDLER_ARGS); 173 const char *oid_fmt; 174 int oid_refcnt; 175 u_int oid_running; 176 const char *oid_descr; 177 }; 178 179 #define SYSCTL_IN(r, p, l) (r->newfunc)(r, p, l) 180 #define SYSCTL_OUT(r, p, l) (r->oldfunc)(r, p, l) 181 182 int sysctl_handle_int(SYSCTL_HANDLER_ARGS); 183 int sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS); 184 int sysctl_handle_long(SYSCTL_HANDLER_ARGS); 185 int sysctl_handle_64(SYSCTL_HANDLER_ARGS); 186 int sysctl_handle_string(SYSCTL_HANDLER_ARGS); 187 int sysctl_handle_opaque(SYSCTL_HANDLER_ARGS); 188 int sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS); 189 190 int sysctl_handle_uma_zone_max(SYSCTL_HANDLER_ARGS); 191 int sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS); 192 193 int sysctl_dpcpu_int(SYSCTL_HANDLER_ARGS); 194 int sysctl_dpcpu_long(SYSCTL_HANDLER_ARGS); 195 int sysctl_dpcpu_quad(SYSCTL_HANDLER_ARGS); 196 197 /* 198 * These functions are used to add/remove an oid from the mib. 199 */ 200 void sysctl_register_oid(struct sysctl_oid *oidp); 201 void sysctl_unregister_oid(struct sysctl_oid *oidp); 202 203 /* Declare a static oid to allow child oids to be added to it. */ 204 #define SYSCTL_DECL(name) \ 205 extern struct sysctl_oid_list sysctl_##name##_children 206 207 /* Hide these in macros. */ 208 #define SYSCTL_CHILDREN(oid_ptr) \ 209 (struct sysctl_oid_list *)(oid_ptr)->oid_arg1 210 #define SYSCTL_PARENT(oid_ptr) NULL /* not supported */ 211 #define SYSCTL_CHILDREN_SET(oid_ptr, val) (oid_ptr)->oid_arg1 = (val) 212 #define SYSCTL_STATIC_CHILDREN(oid_name) (&sysctl_##oid_name##_children) 213 214 /* === Structs and macros related to context handling. === */ 215 216 /* All dynamically created sysctls can be tracked in a context list. */ 217 struct sysctl_ctx_entry { 218 struct sysctl_oid *entry; 219 TAILQ_ENTRY(sysctl_ctx_entry) link; 220 }; 221 222 TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry); 223 224 #define SYSCTL_NODE_CHILDREN(parent, name) \ 225 sysctl_##parent##_##name##_children 226 227 /* 228 * These macros provide type safety for sysctls. SYSCTL_ALLOWED_TYPES() 229 * defines a transparent union of the allowed types. SYSCTL_ASSERT_TYPE() 230 * and SYSCTL_ADD_ASSERT_TYPE() use the transparent union to assert that 231 * the pointer matches the allowed types. 232 * 233 * The allow_0 member allows a literal 0 to be passed for ptr. 234 */ 235 #define SYSCTL_ALLOWED_TYPES(type, decls) \ 236 union sysctl_##type { \ 237 long allow_0; \ 238 decls \ 239 } __attribute__((__transparent_union__)); \ 240 \ 241 static inline void * \ 242 __sysctl_assert_##type(union sysctl_##type ptr) \ 243 { \ 244 return (ptr.a); \ 245 } \ 246 struct __hack 247 248 SYSCTL_ALLOWED_TYPES(INT, int *a; ); 249 SYSCTL_ALLOWED_TYPES(UINT, unsigned int *a; ); 250 SYSCTL_ALLOWED_TYPES(LONG, long *a; ); 251 SYSCTL_ALLOWED_TYPES(ULONG, unsigned long *a; ); 252 SYSCTL_ALLOWED_TYPES(INT64, int64_t *a; long long *b; ); 253 SYSCTL_ALLOWED_TYPES(UINT64, uint64_t *a; unsigned long long *b; ); 254 255 #ifdef notyet 256 #define SYSCTL_ADD_ASSERT_TYPE(type, ptr) \ 257 __sysctl_assert_ ## type (ptr) 258 #define SYSCTL_ASSERT_TYPE(type, ptr, parent, name) \ 259 _SYSCTL_ASSERT_TYPE(type, ptr, __LINE__, parent##_##name) 260 #else 261 #define SYSCTL_ADD_ASSERT_TYPE(type, ptr) ptr 262 #define SYSCTL_ASSERT_TYPE(type, ptr, parent, name) 263 #endif 264 #define _SYSCTL_ASSERT_TYPE(t, p, l, id) \ 265 __SYSCTL_ASSERT_TYPE(t, p, l, id) 266 #define __SYSCTL_ASSERT_TYPE(type, ptr, line, id) \ 267 static inline void \ 268 sysctl_assert_##line##_##id(void) \ 269 { \ 270 (void)__sysctl_assert_##type(ptr); \ 271 } \ 272 struct __hack 273 274 #ifndef NO_SYSCTL_DESCR 275 #define __DESCR(d) d 276 #else 277 #define __DESCR(d) "" 278 #endif 279 280 /* This constructs a "raw" MIB oid. */ 281 #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr)\ 282 static struct sysctl_oid sysctl__##parent##_##name = { \ 283 &sysctl_##parent##_children, \ 284 { NULL }, \ 285 nbr, \ 286 kind, \ 287 a1, \ 288 a2, \ 289 #name, \ 290 handler, \ 291 fmt, \ 292 0, \ 293 0, \ 294 __DESCR(descr) \ 295 }; \ 296 DATA_SET(sysctl_set, sysctl__##parent##_##name) 297 298 #define SYSCTL_ADD_OID(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr) \ 299 sysctl_add_oid(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, __DESCR(descr)) 300 301 /* This constructs a root node from which other nodes can hang. */ 302 #define SYSCTL_ROOT_NODE(nbr, name, access, handler, descr) \ 303 SYSCTL_NODE(, nbr, name, access, handler, descr) 304 305 /* This constructs a node from which other oids can hang. */ 306 #define SYSCTL_NODE(parent, nbr, name, access, handler, descr) \ 307 struct sysctl_oid_list SYSCTL_NODE_CHILDREN(parent, name); \ 308 SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|(access), \ 309 (void*)&SYSCTL_NODE_CHILDREN(parent, name), 0, handler, "N", descr) 310 311 #define SYSCTL_ADD_ROOT_NODE(ctx, nbr, name, access, handler, descr) \ 312 SYSCTL_ADD_NODE(ctx, SYSCTL_STATIC_CHILDREN(), nbr, name, access, handler, descr) 313 314 #define SYSCTL_ADD_NODE(ctx, parent, nbr, name, access, handler, descr) \ 315 sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|(access), \ 316 NULL, 0, handler, "N", __DESCR(descr)) 317 318 /* Oid for a string. len can be 0 to indicate '\0' termination. */ 319 #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) \ 320 SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), \ 321 arg, len, sysctl_handle_string, "A", descr) 322 323 #define SYSCTL_ADD_STRING(ctx, parent, nbr, name, access, arg, len, descr) \ 324 sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_STRING|(access), \ 325 arg, len, sysctl_handle_string, "A", __DESCR(descr)) 326 327 /* Oid for an int. If ptr is NULL, val is returned. */ 328 #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr) \ 329 SYSCTL_ASSERT_TYPE(INT, ptr, parent, name); \ 330 SYSCTL_OID(parent, nbr, name, \ 331 CTLTYPE_INT | CTLFLAG_MPSAFE | (access), \ 332 ptr, val, sysctl_handle_int, "I", descr) 333 334 #define SYSCTL_ADD_INT(ctx, parent, nbr, name, access, ptr, val, descr) \ 335 sysctl_add_oid(ctx, parent, nbr, name, \ 336 CTLTYPE_INT | CTLFLAG_MPSAFE | (access), \ 337 SYSCTL_ADD_ASSERT_TYPE(INT, ptr), val, \ 338 sysctl_handle_int, "I", __DESCR(descr)) 339 340 /* Oid for an unsigned int. If ptr is NULL, val is returned. */ 341 #define SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr) \ 342 SYSCTL_ASSERT_TYPE(UINT, ptr, parent, name); \ 343 SYSCTL_OID(parent, nbr, name, \ 344 CTLTYPE_UINT | CTLFLAG_MPSAFE | (access), \ 345 ptr, val, sysctl_handle_int, "IU", descr) 346 347 #define SYSCTL_ADD_UINT(ctx, parent, nbr, name, access, ptr, val, descr) \ 348 sysctl_add_oid(ctx, parent, nbr, name, \ 349 CTLTYPE_UINT | CTLFLAG_MPSAFE | (access), \ 350 SYSCTL_ADD_ASSERT_TYPE(UINT, ptr), val, \ 351 sysctl_handle_int, "IU", __DESCR(descr)) 352 353 /* Oid for a long. The pointer must be non NULL. */ 354 #define SYSCTL_LONG(parent, nbr, name, access, ptr, val, descr) \ 355 SYSCTL_ASSERT_TYPE(LONG, ptr, parent, name); \ 356 SYSCTL_OID(parent, nbr, name, \ 357 CTLTYPE_LONG | CTLFLAG_MPSAFE | (access), \ 358 ptr, val, sysctl_handle_long, "L", descr) 359 360 #define SYSCTL_ADD_LONG(ctx, parent, nbr, name, access, ptr, descr) \ 361 sysctl_add_oid(ctx, parent, nbr, name, \ 362 CTLTYPE_LONG | CTLFLAG_MPSAFE | (access), \ 363 SYSCTL_ADD_ASSERT_TYPE(LONG, ptr), 0, \ 364 sysctl_handle_long, "L", __DESCR(descr)) 365 366 /* Oid for an unsigned long. The pointer must be non NULL. */ 367 #define SYSCTL_ULONG(parent, nbr, name, access, ptr, val, descr) \ 368 SYSCTL_ASSERT_TYPE(ULONG, ptr, parent, name); \ 369 SYSCTL_OID(parent, nbr, name, \ 370 CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access), \ 371 ptr, val, sysctl_handle_long, "LU", descr) 372 373 #define SYSCTL_ADD_ULONG(ctx, parent, nbr, name, access, ptr, descr) \ 374 sysctl_add_oid(ctx, parent, nbr, name, \ 375 CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access), \ 376 SYSCTL_ADD_ASSERT_TYPE(ULONG, ptr), 0, \ 377 sysctl_handle_long, "LU", __DESCR(descr)) 378 379 /* Oid for a quad. The pointer must be non NULL. */ 380 #define SYSCTL_QUAD(parent, nbr, name, access, ptr, val, descr) \ 381 SYSCTL_ASSERT_TYPE(INT64, ptr, parent, name); \ 382 SYSCTL_OID(parent, nbr, name, \ 383 CTLTYPE_S64 | CTLFLAG_MPSAFE | (access), \ 384 ptr, val, sysctl_handle_64, "Q", descr) 385 386 #define SYSCTL_ADD_QUAD(ctx, parent, nbr, name, access, ptr, descr) \ 387 sysctl_add_oid(ctx, parent, nbr, name, \ 388 CTLTYPE_S64 | CTLFLAG_MPSAFE | (access), \ 389 SYSCTL_ADD_ASSERT_TYPE(INT64, ptr), 0, \ 390 sysctl_handle_64, "Q", __DESCR(descr)) 391 392 #define SYSCTL_UQUAD(parent, nbr, name, access, ptr, val, descr) \ 393 SYSCTL_ASSERT_TYPE(UINT64, ptr, parent, name); \ 394 SYSCTL_OID(parent, nbr, name, \ 395 CTLTYPE_U64 | CTLFLAG_MPSAFE | (access), \ 396 ptr, val, sysctl_handle_64, "QU", descr) 397 398 #define SYSCTL_ADD_UQUAD(ctx, parent, nbr, name, access, ptr, descr) \ 399 sysctl_add_oid(ctx, parent, nbr, name, \ 400 CTLTYPE_U64 | CTLFLAG_MPSAFE | (access), \ 401 SYSCTL_ADD_ASSERT_TYPE(UINT64, ptr), 0, \ 402 sysctl_handle_64, "QU", __DESCR(descr)) 403 404 /* Oid for a 64-bit unsigned counter(9). The pointer must be non NULL. */ 405 #define SYSCTL_COUNTER_U64(parent, nbr, name, access, ptr, descr) \ 406 SYSCTL_ASSERT_TYPE(UINT64, ptr, parent, name); \ 407 SYSCTL_OID(parent, nbr, name, \ 408 CTLTYPE_U64 | CTLFLAG_MPSAFE | (access), \ 409 ptr, 0, sysctl_handle_counter_u64, "QU", descr) 410 411 #define SYSCTL_ADD_COUNTER_U64(ctx, parent, nbr, name, access, ptr, descr)\ 412 sysctl_add_oid(ctx, parent, nbr, name, \ 413 CTLTYPE_U64 | CTLFLAG_MPSAFE | (access), \ 414 SYSCTL_ADD_ASSERT_TYPE(UINT64, ptr), 0, \ 415 sysctl_handle_counter_u64, "QU", __DESCR(descr)) 416 417 /* Oid for an opaque object. Specified by a pointer and a length. */ 418 #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr) \ 419 SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), \ 420 ptr, len, sysctl_handle_opaque, fmt, descr) 421 422 #define SYSCTL_ADD_OPAQUE(ctx, parent, nbr, name, access, ptr, len, fmt, descr)\ 423 sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \ 424 ptr, len, sysctl_handle_opaque, fmt, __DESCR(descr)) 425 426 /* Oid for a struct. Specified by a pointer and a type. */ 427 #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) \ 428 SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), \ 429 ptr, sizeof(struct type), sysctl_handle_opaque, \ 430 "S," #type, descr) 431 432 #define SYSCTL_ADD_STRUCT(ctx, parent, nbr, name, access, ptr, type, descr) \ 433 sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access), \ 434 ptr, sizeof(struct type), sysctl_handle_opaque, "S," #type, __DESCR(descr)) 435 436 /* Oid for a procedure. Specified by a pointer and an arg. */ 437 #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \ 438 CTASSERT(((access) & CTLTYPE) != 0); \ 439 SYSCTL_OID(parent, nbr, name, (access), \ 440 ptr, arg, handler, fmt, descr) 441 442 #define SYSCTL_ADD_PROC(ctx, parent, nbr, name, access, ptr, arg, handler, fmt, descr) \ 443 sysctl_add_oid(ctx, parent, nbr, name, (access), \ 444 ptr, arg, handler, fmt, __DESCR(descr)) 445 446 /* Oid to handle limits on uma(9) zone specified by pointer. */ 447 #define SYSCTL_UMA_MAX(parent, nbr, name, access, ptr, descr) \ 448 SYSCTL_ASSERT_TYPE(INT, ptr, parent, name); \ 449 SYSCTL_OID(parent, nbr, name, \ 450 CTLTYPE_INT | CTLFLAG_MPSAFE | (access), \ 451 ptr, 0, sysctl_handle_uma_zone_max, "I", descr) 452 #define SYSCTL_ADD_UMA_MAX(ctx, parent, nbr, name, access, ptr, descr)\ 453 sysctl_add_oid(ctx, parent, nbr, name, \ 454 CTLTYPE_INT | CTLFLAG_MPSAFE | (access), \ 455 SYSCTL_ADD_ASSERT_TYPE(INT, ptr), 0, \ 456 sysctl_handle_uma_zone_max, "I", __DESCR(descr)) 457 458 /* Oid to obtain current use of uma(9) zone specified by pointer. */ 459 #define SYSCTL_UMA_CUR(parent, nbr, name, access, ptr, descr) \ 460 SYSCTL_ASSERT_TYPE(INT, ptr, parent, name); \ 461 SYSCTL_OID(parent, nbr, name, \ 462 CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access), \ 463 ptr, 0, sysctl_handle_uma_zone_cur, "I", descr) 464 #define SYSCTL_ADD_UMA_CUR(ctx, parent, nbr, name, access, ptr, descr) \ 465 sysctl_add_oid(ctx, parent, nbr, name, \ 466 CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access), \ 467 SYSCTL_ADD_ASSERT_TYPE(INT, ptr), 0, \ 468 sysctl_handle_uma_zone_cur, "I", __DESCR(descr)) 469 470 /* 471 * A macro to generate a read-only sysctl to indicate the presense of optional 472 * kernel features. 473 */ 474 #define FEATURE(name, desc) \ 475 SYSCTL_INT(_kern_features, OID_AUTO, name, CTLFLAG_RD | CTLFLAG_CAPRD, \ 476 NULL, 1, desc) 477 478 #endif /* _KERNEL */ 479 480 /* 481 * Top-level identifiers 482 */ 483 #define CTL_UNSPEC 0 /* unused */ 484 #define CTL_KERN 1 /* "high kernel": proc, limits */ 485 #define CTL_VM 2 /* virtual memory */ 486 #define CTL_VFS 3 /* filesystem, mount type is next */ 487 #define CTL_NET 4 /* network, see socket.h */ 488 #define CTL_DEBUG 5 /* debugging parameters */ 489 #define CTL_HW 6 /* generic cpu/io */ 490 #define CTL_MACHDEP 7 /* machine dependent */ 491 #define CTL_USER 8 /* user-level */ 492 #define CTL_P1003_1B 9 /* POSIX 1003.1B */ 493 #define CTL_MAXID 10 /* number of valid top-level ids */ 494 495 /* 496 * CTL_KERN identifiers 497 */ 498 #define KERN_OSTYPE 1 /* string: system version */ 499 #define KERN_OSRELEASE 2 /* string: system release */ 500 #define KERN_OSREV 3 /* int: system revision */ 501 #define KERN_VERSION 4 /* string: compile time info */ 502 #define KERN_MAXVNODES 5 /* int: max vnodes */ 503 #define KERN_MAXPROC 6 /* int: max processes */ 504 #define KERN_MAXFILES 7 /* int: max open files */ 505 #define KERN_ARGMAX 8 /* int: max arguments to exec */ 506 #define KERN_SECURELVL 9 /* int: system security level */ 507 #define KERN_HOSTNAME 10 /* string: hostname */ 508 #define KERN_HOSTID 11 /* int: host identifier */ 509 #define KERN_CLOCKRATE 12 /* struct: struct clockrate */ 510 #define KERN_VNODE 13 /* struct: vnode structures */ 511 #define KERN_PROC 14 /* struct: process entries */ 512 #define KERN_FILE 15 /* struct: file entries */ 513 #define KERN_PROF 16 /* node: kernel profiling info */ 514 #define KERN_POSIX1 17 /* int: POSIX.1 version */ 515 #define KERN_NGROUPS 18 /* int: # of supplemental group ids */ 516 #define KERN_JOB_CONTROL 19 /* int: is job control available */ 517 #define KERN_SAVED_IDS 20 /* int: saved set-user/group-ID */ 518 #define KERN_BOOTTIME 21 /* struct: time kernel was booted */ 519 #define KERN_NISDOMAINNAME 22 /* string: YP domain name */ 520 #define KERN_UPDATEINTERVAL 23 /* int: update process sleep time */ 521 #define KERN_OSRELDATE 24 /* int: kernel release date */ 522 #define KERN_NTP_PLL 25 /* node: NTP PLL control */ 523 #define KERN_BOOTFILE 26 /* string: name of booted kernel */ 524 #define KERN_MAXFILESPERPROC 27 /* int: max open files per proc */ 525 #define KERN_MAXPROCPERUID 28 /* int: max processes per uid */ 526 #define KERN_DUMPDEV 29 /* struct cdev *: device to dump on */ 527 #define KERN_IPC 30 /* node: anything related to IPC */ 528 #define KERN_DUMMY 31 /* unused */ 529 #define KERN_PS_STRINGS 32 /* int: address of PS_STRINGS */ 530 #define KERN_USRSTACK 33 /* int: address of USRSTACK */ 531 #define KERN_LOGSIGEXIT 34 /* int: do we log sigexit procs? */ 532 #define KERN_IOV_MAX 35 /* int: value of UIO_MAXIOV */ 533 #define KERN_HOSTUUID 36 /* string: host UUID identifier */ 534 #define KERN_ARND 37 /* int: from arc4rand() */ 535 #define KERN_MAXID 38 /* number of valid kern ids */ 536 /* 537 * KERN_PROC subtypes 538 */ 539 #define KERN_PROC_ALL 0 /* everything */ 540 #define KERN_PROC_PID 1 /* by process id */ 541 #define KERN_PROC_PGRP 2 /* by process group id */ 542 #define KERN_PROC_SESSION 3 /* by session of pid */ 543 #define KERN_PROC_TTY 4 /* by controlling tty */ 544 #define KERN_PROC_UID 5 /* by effective uid */ 545 #define KERN_PROC_RUID 6 /* by real uid */ 546 #define KERN_PROC_ARGS 7 /* get/set arguments/proctitle */ 547 #define KERN_PROC_PROC 8 /* only return procs */ 548 #define KERN_PROC_SV_NAME 9 /* get syscall vector name */ 549 #define KERN_PROC_RGID 10 /* by real group id */ 550 #define KERN_PROC_GID 11 /* by effective group id */ 551 #define KERN_PROC_PATHNAME 12 /* path to executable */ 552 #define KERN_PROC_OVMMAP 13 /* Old VM map entries for process */ 553 #define KERN_PROC_OFILEDESC 14 /* Old file descriptors for process */ 554 #define KERN_PROC_KSTACK 15 /* Kernel stacks for process */ 555 #define KERN_PROC_INC_THREAD 0x10 /* 556 * modifier for pid, pgrp, tty, 557 * uid, ruid, gid, rgid and proc 558 * This effectively uses 16-31 559 */ 560 #define KERN_PROC_VMMAP 32 /* VM map entries for process */ 561 #define KERN_PROC_FILEDESC 33 /* File descriptors for process */ 562 #define KERN_PROC_GROUPS 34 /* process groups */ 563 #define KERN_PROC_ENV 35 /* get environment */ 564 #define KERN_PROC_AUXV 36 /* get ELF auxiliary vector */ 565 #define KERN_PROC_RLIMIT 37 /* process resource limits */ 566 #define KERN_PROC_PS_STRINGS 38 /* get ps_strings location */ 567 #define KERN_PROC_UMASK 39 /* process umask */ 568 #define KERN_PROC_OSREL 40 /* osreldate for process binary */ 569 #define KERN_PROC_SIGTRAMP 41 /* signal trampoline location */ 570 571 /* 572 * KERN_IPC identifiers 573 */ 574 #define KIPC_MAXSOCKBUF 1 /* int: max size of a socket buffer */ 575 #define KIPC_SOCKBUF_WASTE 2 /* int: wastage factor in sockbuf */ 576 #define KIPC_SOMAXCONN 3 /* int: max length of connection q */ 577 #define KIPC_MAX_LINKHDR 4 /* int: max length of link header */ 578 #define KIPC_MAX_PROTOHDR 5 /* int: max length of network header */ 579 #define KIPC_MAX_HDR 6 /* int: max total length of headers */ 580 #define KIPC_MAX_DATALEN 7 /* int: max length of data? */ 581 582 /* 583 * CTL_HW identifiers 584 */ 585 #define HW_MACHINE 1 /* string: machine class */ 586 #define HW_MODEL 2 /* string: specific machine model */ 587 #define HW_NCPU 3 /* int: number of cpus */ 588 #define HW_BYTEORDER 4 /* int: machine byte order */ 589 #define HW_PHYSMEM 5 /* int: total memory */ 590 #define HW_USERMEM 6 /* int: non-kernel memory */ 591 #define HW_PAGESIZE 7 /* int: software page size */ 592 #define HW_DISKNAMES 8 /* strings: disk drive names */ 593 #define HW_DISKSTATS 9 /* struct: diskstats[] */ 594 #define HW_FLOATINGPT 10 /* int: has HW floating point? */ 595 #define HW_MACHINE_ARCH 11 /* string: machine architecture */ 596 #define HW_REALMEM 12 /* int: 'real' memory */ 597 #define HW_MAXID 13 /* number of valid hw ids */ 598 599 /* 600 * CTL_USER definitions 601 */ 602 #define USER_CS_PATH 1 /* string: _CS_PATH */ 603 #define USER_BC_BASE_MAX 2 /* int: BC_BASE_MAX */ 604 #define USER_BC_DIM_MAX 3 /* int: BC_DIM_MAX */ 605 #define USER_BC_SCALE_MAX 4 /* int: BC_SCALE_MAX */ 606 #define USER_BC_STRING_MAX 5 /* int: BC_STRING_MAX */ 607 #define USER_COLL_WEIGHTS_MAX 6 /* int: COLL_WEIGHTS_MAX */ 608 #define USER_EXPR_NEST_MAX 7 /* int: EXPR_NEST_MAX */ 609 #define USER_LINE_MAX 8 /* int: LINE_MAX */ 610 #define USER_RE_DUP_MAX 9 /* int: RE_DUP_MAX */ 611 #define USER_POSIX2_VERSION 10 /* int: POSIX2_VERSION */ 612 #define USER_POSIX2_C_BIND 11 /* int: POSIX2_C_BIND */ 613 #define USER_POSIX2_C_DEV 12 /* int: POSIX2_C_DEV */ 614 #define USER_POSIX2_CHAR_TERM 13 /* int: POSIX2_CHAR_TERM */ 615 #define USER_POSIX2_FORT_DEV 14 /* int: POSIX2_FORT_DEV */ 616 #define USER_POSIX2_FORT_RUN 15 /* int: POSIX2_FORT_RUN */ 617 #define USER_POSIX2_LOCALEDEF 16 /* int: POSIX2_LOCALEDEF */ 618 #define USER_POSIX2_SW_DEV 17 /* int: POSIX2_SW_DEV */ 619 #define USER_POSIX2_UPE 18 /* int: POSIX2_UPE */ 620 #define USER_STREAM_MAX 19 /* int: POSIX2_STREAM_MAX */ 621 #define USER_TZNAME_MAX 20 /* int: POSIX2_TZNAME_MAX */ 622 #define USER_MAXID 21 /* number of valid user ids */ 623 624 #define CTL_P1003_1B_ASYNCHRONOUS_IO 1 /* boolean */ 625 #define CTL_P1003_1B_MAPPED_FILES 2 /* boolean */ 626 #define CTL_P1003_1B_MEMLOCK 3 /* boolean */ 627 #define CTL_P1003_1B_MEMLOCK_RANGE 4 /* boolean */ 628 #define CTL_P1003_1B_MEMORY_PROTECTION 5 /* boolean */ 629 #define CTL_P1003_1B_MESSAGE_PASSING 6 /* boolean */ 630 #define CTL_P1003_1B_PRIORITIZED_IO 7 /* boolean */ 631 #define CTL_P1003_1B_PRIORITY_SCHEDULING 8 /* boolean */ 632 #define CTL_P1003_1B_REALTIME_SIGNALS 9 /* boolean */ 633 #define CTL_P1003_1B_SEMAPHORES 10 /* boolean */ 634 #define CTL_P1003_1B_FSYNC 11 /* boolean */ 635 #define CTL_P1003_1B_SHARED_MEMORY_OBJECTS 12 /* boolean */ 636 #define CTL_P1003_1B_SYNCHRONIZED_IO 13 /* boolean */ 637 #define CTL_P1003_1B_TIMERS 14 /* boolean */ 638 #define CTL_P1003_1B_AIO_LISTIO_MAX 15 /* int */ 639 #define CTL_P1003_1B_AIO_MAX 16 /* int */ 640 #define CTL_P1003_1B_AIO_PRIO_DELTA_MAX 17 /* int */ 641 #define CTL_P1003_1B_DELAYTIMER_MAX 18 /* int */ 642 #define CTL_P1003_1B_MQ_OPEN_MAX 19 /* int */ 643 #define CTL_P1003_1B_PAGESIZE 20 /* int */ 644 #define CTL_P1003_1B_RTSIG_MAX 21 /* int */ 645 #define CTL_P1003_1B_SEM_NSEMS_MAX 22 /* int */ 646 #define CTL_P1003_1B_SEM_VALUE_MAX 23 /* int */ 647 #define CTL_P1003_1B_SIGQUEUE_MAX 24 /* int */ 648 #define CTL_P1003_1B_TIMER_MAX 25 /* int */ 649 650 #define CTL_P1003_1B_MAXID 26 651 652 #ifdef _KERNEL 653 654 /* 655 * Declare some common oids. 656 */ 657 extern struct sysctl_oid_list sysctl__children; 658 SYSCTL_DECL(_kern); 659 SYSCTL_DECL(_kern_features); 660 SYSCTL_DECL(_kern_ipc); 661 SYSCTL_DECL(_kern_proc); 662 SYSCTL_DECL(_kern_sched); 663 SYSCTL_DECL(_kern_sched_stats); 664 SYSCTL_DECL(_sysctl); 665 SYSCTL_DECL(_vm); 666 SYSCTL_DECL(_vm_stats); 667 SYSCTL_DECL(_vm_stats_misc); 668 SYSCTL_DECL(_vfs); 669 SYSCTL_DECL(_net); 670 SYSCTL_DECL(_debug); 671 SYSCTL_DECL(_debug_sizeof); 672 SYSCTL_DECL(_dev); 673 SYSCTL_DECL(_hw); 674 SYSCTL_DECL(_hw_bus); 675 SYSCTL_DECL(_hw_bus_devices); 676 SYSCTL_DECL(_hw_bus_info); 677 SYSCTL_DECL(_machdep); 678 SYSCTL_DECL(_user); 679 SYSCTL_DECL(_compat); 680 SYSCTL_DECL(_regression); 681 SYSCTL_DECL(_security); 682 SYSCTL_DECL(_security_bsd); 683 684 extern char machine[]; 685 extern char osrelease[]; 686 extern char ostype[]; 687 extern char kern_ident[]; 688 689 /* Dynamic oid handling */ 690 struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist, 691 struct sysctl_oid_list *parent, int nbr, const char *name, int kind, 692 void *arg1, intptr_t arg2, int (*handler)(SYSCTL_HANDLER_ARGS), 693 const char *fmt, const char *descr); 694 int sysctl_remove_name(struct sysctl_oid *parent, const char *name, int del, 695 int recurse); 696 void sysctl_rename_oid(struct sysctl_oid *oidp, const char *name); 697 int sysctl_move_oid(struct sysctl_oid *oidp, 698 struct sysctl_oid_list *parent); 699 int sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse); 700 int sysctl_ctx_init(struct sysctl_ctx_list *clist); 701 int sysctl_ctx_free(struct sysctl_ctx_list *clist); 702 struct sysctl_ctx_entry *sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, 703 struct sysctl_oid *oidp); 704 struct sysctl_ctx_entry *sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, 705 struct sysctl_oid *oidp); 706 int sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, 707 struct sysctl_oid *oidp); 708 709 int kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 710 size_t *oldlenp, void *new, size_t newlen, size_t *retval, 711 int flags); 712 int kernel_sysctlbyname(struct thread *td, char *name, void *old, 713 size_t *oldlenp, void *new, size_t newlen, size_t *retval, 714 int flags); 715 int userland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 716 size_t *oldlenp, int inkernel, void *new, size_t newlen, 717 size_t *retval, int flags); 718 int sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 719 int *nindx, struct sysctl_req *req); 720 void sysctl_lock(void); 721 void sysctl_unlock(void); 722 int sysctl_wire_old_buffer(struct sysctl_req *req, size_t len); 723 724 struct sbuf; 725 struct sbuf *sbuf_new_for_sysctl(struct sbuf *, char *, int, 726 struct sysctl_req *); 727 #else /* !_KERNEL */ 728 #include <sys/cdefs.h> 729 730 __BEGIN_DECLS 731 int sysctl(const int *, u_int, void *, size_t *, const void *, size_t); 732 int sysctlbyname(const char *, void *, size_t *, const void *, size_t); 733 int sysctlnametomib(const char *, int *, size_t *); 734 __END_DECLS 735 #endif /* _KERNEL */ 736 737 #endif /* !_SYS_SYSCTL_H_ */
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