FreeBSD/Linux Kernel Cross Reference
sys/sys/sysctl.h
1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Mike Karels at Berkeley Software Design, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)sysctl.h 8.1 (Berkeley) 6/2/93
37 * $FreeBSD: src/sys/sys/sysctl.h,v 1.48.2.3 1999/09/05 08:22:59 peter Exp $
38 */
39
40 #ifndef _SYS_SYSCTL_H_
41 #define _SYS_SYSCTL_H_
42
43 /*
44 * Definitions for sysctl call. The sysctl call uses a hierarchical name
45 * for objects that can be examined or modified. The name is expressed as
46 * a sequence of integers. Like a file path name, the meaning of each
47 * component depends on its place in the hierarchy. The top-level and kern
48 * identifiers are defined here, and other identifiers are defined in the
49 * respective subsystem header files.
50 */
51
52 #define CTL_MAXNAME 12 /* largest number of components supported */
53
54 /*
55 * Each subsystem defined by sysctl defines a list of variables
56 * for that subsystem. Each name is either a node with further
57 * levels defined below it, or it is a leaf of some particular
58 * type given below. Each sysctl level defines a set of name/type
59 * pairs to be used by sysctl(1) in manipulating the subsystem.
60 */
61 struct ctlname {
62 char *ctl_name; /* subsystem name */
63 int ctl_type; /* type of name */
64 };
65
66 #define CTLTYPE 0xf /* Mask for the type */
67 #define CTLTYPE_NODE 1 /* name is a node */
68 #define CTLTYPE_INT 2 /* name describes an integer */
69 #define CTLTYPE_STRING 3 /* name describes a string */
70 #define CTLTYPE_QUAD 4 /* name describes a 64-bit number */
71 #define CTLTYPE_OPAQUE 5 /* name describes a structure */
72 #define CTLTYPE_STRUCT CTLTYPE_OPAQUE /* name describes a structure */
73
74 #define CTLFLAG_RD 0x80000000 /* Allow reads of variable */
75 #define CTLFLAG_WR 0x40000000 /* Allow writes to the variable */
76 #define CTLFLAG_RW (CTLFLAG_RD|CTLFLAG_WR)
77 #define CTLFLAG_NOLOCK 0x20000000 /* XXX Don't Lock */
78 #define CTLFLAG_ANYBODY 0x10000000 /* All users can set this var */
79
80 /*
81 * USE THIS instead of a hardwired number from the categories below
82 * to get dynamically assigned sysctl entries using the linker-set
83 * technology. This is the way nearly all new sysctl variables should
84 * be implimented.
85 * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
86 */
87 #define OID_AUTO (-1)
88
89 #ifdef KERNEL
90 #define SYSCTL_HANDLER_ARGS (struct sysctl_oid *oidp, void *arg1, int arg2, \
91 struct sysctl_req *req)
92
93 /*
94 * This describes the access space for a sysctl request. This is needed
95 * so that we can use the interface from the kernel or from user-space.
96 */
97 struct sysctl_req {
98 struct proc *p;
99 int lock;
100 void *oldptr;
101 int oldlen;
102 int oldidx;
103 int (*oldfunc)(struct sysctl_req *, const void *, int);
104 void *newptr;
105 int newlen;
106 int newidx;
107 int (*newfunc)(struct sysctl_req *, void *, int);
108 };
109
110 /*
111 * This describes one "oid" in the MIB tree. Potentially more nodes can
112 * be hidden behind it, expanded by the handler.
113 */
114 struct sysctl_oid {
115 int oid_number;
116 int oid_kind;
117 void *oid_arg1;
118 int oid_arg2;
119 const char *oid_name;
120 int (*oid_handler) SYSCTL_HANDLER_ARGS;
121 const char *oid_fmt;
122 };
123
124 #define SYSCTL_IN(r, p, l) (r->newfunc)(r, p, l)
125 #define SYSCTL_OUT(r, p, l) (r->oldfunc)(r, p, l)
126
127 int sysctl_handle_int SYSCTL_HANDLER_ARGS;
128 int sysctl_handle_string SYSCTL_HANDLER_ARGS;
129 int sysctl_handle_opaque SYSCTL_HANDLER_ARGS;
130
131 /* This is the "raw" function for a mib-oid */
132 #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
133 static const struct sysctl_oid sysctl__##parent##_##name = { \
134 nbr, kind, a1, a2, #name, handler, fmt }; \
135 TEXT_SET(sysctl_##parent, sysctl__##parent##_##name);
136
137 /* This makes a node from which other oids can hang */
138 #define SYSCTL_NODE(parent, nbr, name, access, handler, descr) \
139 extern struct linker_set sysctl_##parent##_##name; \
140 SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|access, \
141 (void*)&sysctl_##parent##_##name, 0, handler, "N", descr); \
142 TEXT_SET(sysctl_##parent##_##name, sysctl__##parent##_##name);
143
144 /* This is a string len can be 0 to indicate '\0' termination */
145 #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) \
146 SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|access, \
147 arg, len, sysctl_handle_string, "A", descr);
148
149 /* This is a integer, if ptr is NULL, val is returned */
150 #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr) \
151 SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|access, \
152 ptr, val, sysctl_handle_int, "I", descr);
153
154 /* This is anything, specified by a pointer and a lenth */
155 #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr) \
156 SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|access, \
157 ptr, len, sysctl_handle_opaque, fmt, descr);
158
159 /* This is a struct, specified by a pointer and type */
160 #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) \
161 SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|access, \
162 ptr, sizeof(struct type), sysctl_handle_opaque, \
163 "S," #type, descr);
164
165 /* Needs a proc. Specify by pointer and arg */
166 #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
167 SYSCTL_OID(parent, nbr, name, access, \
168 ptr, arg, handler, fmt, descr);
169 #endif /* KERNEL */
170
171 /*
172 * Top-level identifiers
173 */
174 #define CTL_UNSPEC 0 /* unused */
175 #define CTL_KERN 1 /* "high kernel": proc, limits */
176 #define CTL_VM 2 /* virtual memory */
177 #define CTL_VFS 3 /* file system, mount type is next */
178 #define CTL_NET 4 /* network, see socket.h */
179 #define CTL_DEBUG 5 /* debugging parameters */
180 #define CTL_HW 6 /* generic cpu/io */
181 #define CTL_MACHDEP 7 /* machine dependent */
182 #define CTL_USER 8 /* user-level */
183 #define CTL_MAXID 9 /* number of valid top-level ids */
184
185 #define CTL_NAMES { \
186 { 0, 0 }, \
187 { "kern", CTLTYPE_NODE }, \
188 { "vm", CTLTYPE_NODE }, \
189 { "vfs", CTLTYPE_NODE }, \
190 { "net", CTLTYPE_NODE }, \
191 { "debug", CTLTYPE_NODE }, \
192 { "hw", CTLTYPE_NODE }, \
193 { "machdep", CTLTYPE_NODE }, \
194 { "user", CTLTYPE_NODE }, \
195 }
196
197 /*
198 * CTL_KERN identifiers
199 */
200 #define KERN_OSTYPE 1 /* string: system version */
201 #define KERN_OSRELEASE 2 /* string: system release */
202 #define KERN_OSREV 3 /* int: system revision */
203 #define KERN_VERSION 4 /* string: compile time info */
204 #define KERN_MAXVNODES 5 /* int: max vnodes */
205 #define KERN_MAXPROC 6 /* int: max processes */
206 #define KERN_MAXFILES 7 /* int: max open files */
207 #define KERN_ARGMAX 8 /* int: max arguments to exec */
208 #define KERN_SECURELVL 9 /* int: system security level */
209 #define KERN_HOSTNAME 10 /* string: hostname */
210 #define KERN_HOSTID 11 /* int: host identifier */
211 #define KERN_CLOCKRATE 12 /* struct: struct clockrate */
212 #define KERN_VNODE 13 /* struct: vnode structures */
213 #define KERN_PROC 14 /* struct: process entries */
214 #define KERN_FILE 15 /* struct: file entries */
215 #define KERN_PROF 16 /* node: kernel profiling info */
216 #define KERN_POSIX1 17 /* int: POSIX.1 version */
217 #define KERN_NGROUPS 18 /* int: # of supplemental group ids */
218 #define KERN_JOB_CONTROL 19 /* int: is job control available */
219 #define KERN_SAVED_IDS 20 /* int: saved set-user/group-ID */
220 #define KERN_BOOTTIME 21 /* struct: time kernel was booted */
221 #define KERN_NISDOMAINNAME 22 /* string: YP domain name */
222 #define KERN_UPDATEINTERVAL 23 /* int: update process sleep time */
223 #define KERN_OSRELDATE 24 /* int: OS release date */
224 #define KERN_NTP_PLL 25 /* node: NTP PLL control */
225 #define KERN_BOOTFILE 26 /* string: name of booted kernel */
226 #define KERN_MAXFILESPERPROC 27 /* int: max open files per proc */
227 #define KERN_MAXPROCPERUID 28 /* int: max processes per uid */
228 #define KERN_DUMPDEV 29 /* dev_t: device to dump on */
229 #define KERN_SOMAXCONN 30 /* int: max connections in listen q */
230 #define KERN_MAXSOCKBUF 31 /* int: max size of a socket buffer */
231 #define KERN_PS_STRINGS 32 /* int: address of PS_STRINGS */
232 #define KERN_USRSTACK 33 /* int: address of USRSTACK */
233 #define KERN_MAXID 34 /* number of valid kern ids */
234
235 #define CTL_KERN_NAMES { \
236 { 0, 0 }, \
237 { "ostype", CTLTYPE_STRING }, \
238 { "osrelease", CTLTYPE_STRING }, \
239 { "osrevision", CTLTYPE_INT }, \
240 { "version", CTLTYPE_STRING }, \
241 { "maxvnodes", CTLTYPE_INT }, \
242 { "maxproc", CTLTYPE_INT }, \
243 { "maxfiles", CTLTYPE_INT }, \
244 { "argmax", CTLTYPE_INT }, \
245 { "securelevel", CTLTYPE_INT }, \
246 { "hostname", CTLTYPE_STRING }, \
247 { "hostid", CTLTYPE_INT }, \
248 { "clockrate", CTLTYPE_STRUCT }, \
249 { "vnode", CTLTYPE_STRUCT }, \
250 { "proc", CTLTYPE_STRUCT }, \
251 { "file", CTLTYPE_STRUCT }, \
252 { "profiling", CTLTYPE_NODE }, \
253 { "posix1version", CTLTYPE_INT }, \
254 { "ngroups", CTLTYPE_INT }, \
255 { "job_control", CTLTYPE_INT }, \
256 { "saved_ids", CTLTYPE_INT }, \
257 { "boottime", CTLTYPE_STRUCT }, \
258 { "nisdomainname", CTLTYPE_STRING }, \
259 { "update", CTLTYPE_INT }, \
260 { "osreldate", CTLTYPE_INT }, \
261 { "ntp_pll", CTLTYPE_NODE }, \
262 { "bootfile", CTLTYPE_STRING }, \
263 { "maxfilesperproc", CTLTYPE_INT }, \
264 { "maxprocperuid", CTLTYPE_INT }, \
265 { "dumpdev", CTLTYPE_STRUCT }, /* we lie; don't print as int */ \
266 { "somaxconn", CTLTYPE_INT }, \
267 { "maxsockbuf", CTLTYPE_INT }, \
268 { "ps_strings", CTLTYPE_INT }, \
269 { "usrstack", CTLTYPE_INT }, \
270 }
271
272 /*
273 * CTL_VFS identifiers
274 */
275 #define VFS_VFSCONF 0 /* get configured filesystems */
276 #define VFS_MAXID 1 /* number of items */
277
278 #define CTL_VFS_NAMES { \
279 { "vfsconf", CTLTYPE_STRUCT }, \
280 }
281
282 /*
283 * KERN_PROC subtypes
284 */
285 #define KERN_PROC_ALL 0 /* everything */
286 #define KERN_PROC_PID 1 /* by process id */
287 #define KERN_PROC_PGRP 2 /* by process group id */
288 #define KERN_PROC_SESSION 3 /* by session of pid */
289 #define KERN_PROC_TTY 4 /* by controlling tty */
290 #define KERN_PROC_UID 5 /* by effective uid */
291 #define KERN_PROC_RUID 6 /* by real uid */
292
293 /*
294 * CTL_HW identifiers
295 */
296 #define HW_MACHINE 1 /* string: machine class */
297 #define HW_MODEL 2 /* string: specific machine model */
298 #define HW_NCPU 3 /* int: number of cpus */
299 #define HW_BYTEORDER 4 /* int: machine byte order */
300 #define HW_PHYSMEM 5 /* int: total memory */
301 #define HW_USERMEM 6 /* int: non-kernel memory */
302 #define HW_PAGESIZE 7 /* int: software page size */
303 #define HW_DISKNAMES 8 /* strings: disk drive names */
304 #define HW_DISKSTATS 9 /* struct: diskstats[] */
305 #define HW_FLOATINGPT 10 /* int: has HW floating point? */
306 #define HW_MACHINE_ARCH 11 /* string: machine architecture */
307 #define HW_MAXID 12 /* number of valid hw ids */
308
309 #define CTL_HW_NAMES { \
310 { 0, 0 }, \
311 { "machine", CTLTYPE_STRING }, \
312 { "model", CTLTYPE_STRING }, \
313 { "ncpu", CTLTYPE_INT }, \
314 { "byteorder", CTLTYPE_INT }, \
315 { "physmem", CTLTYPE_INT }, \
316 { "usermem", CTLTYPE_INT }, \
317 { "pagesize", CTLTYPE_INT }, \
318 { "disknames", CTLTYPE_STRUCT }, \
319 { "diskstats", CTLTYPE_STRUCT }, \
320 { "floatingpoint", CTLTYPE_INT }, \
321 }
322
323 /*
324 * CTL_USER definitions
325 */
326 #define USER_CS_PATH 1 /* string: _CS_PATH */
327 #define USER_BC_BASE_MAX 2 /* int: BC_BASE_MAX */
328 #define USER_BC_DIM_MAX 3 /* int: BC_DIM_MAX */
329 #define USER_BC_SCALE_MAX 4 /* int: BC_SCALE_MAX */
330 #define USER_BC_STRING_MAX 5 /* int: BC_STRING_MAX */
331 #define USER_COLL_WEIGHTS_MAX 6 /* int: COLL_WEIGHTS_MAX */
332 #define USER_EXPR_NEST_MAX 7 /* int: EXPR_NEST_MAX */
333 #define USER_LINE_MAX 8 /* int: LINE_MAX */
334 #define USER_RE_DUP_MAX 9 /* int: RE_DUP_MAX */
335 #define USER_POSIX2_VERSION 10 /* int: POSIX2_VERSION */
336 #define USER_POSIX2_C_BIND 11 /* int: POSIX2_C_BIND */
337 #define USER_POSIX2_C_DEV 12 /* int: POSIX2_C_DEV */
338 #define USER_POSIX2_CHAR_TERM 13 /* int: POSIX2_CHAR_TERM */
339 #define USER_POSIX2_FORT_DEV 14 /* int: POSIX2_FORT_DEV */
340 #define USER_POSIX2_FORT_RUN 15 /* int: POSIX2_FORT_RUN */
341 #define USER_POSIX2_LOCALEDEF 16 /* int: POSIX2_LOCALEDEF */
342 #define USER_POSIX2_SW_DEV 17 /* int: POSIX2_SW_DEV */
343 #define USER_POSIX2_UPE 18 /* int: POSIX2_UPE */
344 #define USER_STREAM_MAX 19 /* int: POSIX2_STREAM_MAX */
345 #define USER_TZNAME_MAX 20 /* int: POSIX2_TZNAME_MAX */
346 #define USER_MAXID 21 /* number of valid user ids */
347
348 #define CTL_USER_NAMES { \
349 { 0, 0 }, \
350 { "cs_path", CTLTYPE_STRING }, \
351 { "bc_base_max", CTLTYPE_INT }, \
352 { "bc_dim_max", CTLTYPE_INT }, \
353 { "bc_scale_max", CTLTYPE_INT }, \
354 { "bc_string_max", CTLTYPE_INT }, \
355 { "coll_weights_max", CTLTYPE_INT }, \
356 { "expr_nest_max", CTLTYPE_INT }, \
357 { "line_max", CTLTYPE_INT }, \
358 { "re_dup_max", CTLTYPE_INT }, \
359 { "posix2_version", CTLTYPE_INT }, \
360 { "posix2_c_bind", CTLTYPE_INT }, \
361 { "posix2_c_dev", CTLTYPE_INT }, \
362 { "posix2_char_term", CTLTYPE_INT }, \
363 { "posix2_fort_dev", CTLTYPE_INT }, \
364 { "posix2_fort_run", CTLTYPE_INT }, \
365 { "posix2_localedef", CTLTYPE_INT }, \
366 { "posix2_sw_dev", CTLTYPE_INT }, \
367 { "posix2_upe", CTLTYPE_INT }, \
368 { "stream_max", CTLTYPE_INT }, \
369 { "tzname_max", CTLTYPE_INT }, \
370 }
371
372 #ifdef KERNEL
373
374 extern char cpu_model[];
375 extern char machine[];
376 extern char osrelease[];
377 extern char ostype[];
378
379 int kernel_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t *oldlenp, void *new, size_t newlen, int *retval);
380 int userland_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen, int *retval);
381 /*
382 int sysctl_clockrate __P((char *, size_t*));
383 int sysctl_file __P((char *, size_t*));
384 int sysctl_doproc __P((int *, u_int, char *, size_t*));
385 int sysctl_doprof __P((int *, u_int, void *, size_t *, void *, size_t));
386 */
387
388 #else /* !KERNEL */
389 #include <sys/cdefs.h>
390
391 __BEGIN_DECLS
392 int sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
393 int sysctlbyname __P((const char *, void *, size_t *, void *, size_t));
394 __END_DECLS
395 #endif /* KERNEL */
396
397 #endif /* !_SYS_SYSCTL_H_ */
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