xref: /freebsd/sys/sys/sysctl.h (revision 8e537d168674d6b65869f73c20813001af875738)
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  * $Id: sysctl.h,v 1.44 1996/09/10 23:31:13 bde 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 #define OID_AUTO	(-1)
81 
82 #ifdef KERNEL
83 #define SYSCTL_HANDLER_ARGS (struct sysctl_oid *oidp, void *arg1, int arg2, \
84 	struct sysctl_req *req)
85 
86 /*
87  * This describes the access space for a sysctl request.  This is needed
88  * so that we can use the interface from the kernel or from user-space.
89  */
90 struct sysctl_req {
91 	struct proc	*p;
92 	int		lock;
93 	void		*oldptr;
94 	int		oldlen;
95 	int		oldidx;
96 	int		(*oldfunc)(struct sysctl_req *, const void *, int);
97 	void		*newptr;
98 	int		newlen;
99 	int		newidx;
100 	int		(*newfunc)(struct sysctl_req *, void *, int);
101 };
102 
103 /*
104  * This describes one "oid" in the MIB tree.  Potentially more nodes can
105  * be hidden behind it, expanded by the handler.
106  */
107 struct sysctl_oid {
108 	int		oid_number;
109 	int		oid_kind;
110 	void		*oid_arg1;
111 	int		oid_arg2;
112 	const char	*oid_name;
113 	int 		(*oid_handler) SYSCTL_HANDLER_ARGS;
114 	const char	*oid_fmt;
115 };
116 
117 #define SYSCTL_IN(r, p, l) (r->newfunc)(r, p, l)
118 #define SYSCTL_OUT(r, p, l) (r->oldfunc)(r, p, l)
119 
120 int sysctl_handle_int SYSCTL_HANDLER_ARGS;
121 int sysctl_handle_string SYSCTL_HANDLER_ARGS;
122 int sysctl_handle_opaque SYSCTL_HANDLER_ARGS;
123 
124 /* This is the "raw" function for a mib-oid */
125 #define SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
126 	static const struct sysctl_oid sysctl__##parent##_##name = { \
127 		nbr, kind, a1, a2, #name, handler, fmt }; \
128 	TEXT_SET(sysctl_##parent, sysctl__##parent##_##name);
129 
130 /* This makes a node from which other oids can hang */
131 #define SYSCTL_NODE(parent, nbr, name, access, handler, descr) \
132 	extern struct linker_set sysctl_##parent##_##name; \
133 	SYSCTL_OID(parent, nbr, name, CTLTYPE_NODE|access, \
134 		(void*)&sysctl_##parent##_##name, 0, handler, "N", descr); \
135 	TEXT_SET(sysctl_##parent##_##name, sysctl__##parent##_##name);
136 
137 /* This is a string len can be 0 to indicate '\0' termination */
138 #define SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) \
139 	SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|access, \
140 		arg, len, sysctl_handle_string, "A", descr);
141 
142 /* This is a integer, if ptr is NULL, val is returned */
143 #define SYSCTL_INT(parent, nbr, name, access, ptr, val, descr) \
144 	SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|access, \
145 		ptr, val, sysctl_handle_int, "I", descr);
146 
147 /* This is anything, specified by a pointer and a lenth */
148 #define SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr) \
149 	SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|access, \
150 		ptr, len, sysctl_handle_opaque, fmt, descr);
151 
152 /* This is a struct, specified by a pointer and type */
153 #define SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) \
154 	SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|access, \
155 		ptr, sizeof(struct type), sysctl_handle_opaque, \
156 		"S," #type, descr);
157 
158 /* Needs a proc.  Specify by pointer and arg */
159 #define SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
160 	SYSCTL_OID(parent, nbr, name, access, \
161 		ptr, arg, handler, fmt, descr);
162 #endif /* KERNEL */
163 
164 /*
165  * Top-level identifiers
166  */
167 #define	CTL_UNSPEC	0		/* unused */
168 #define	CTL_KERN	1		/* "high kernel": proc, limits */
169 #define	CTL_VM		2		/* virtual memory */
170 #define	CTL_VFS		3		/* file system, mount type is next */
171 #define	CTL_NET		4		/* network, see socket.h */
172 #define	CTL_DEBUG	5		/* debugging parameters */
173 #define	CTL_HW		6		/* generic cpu/io */
174 #define	CTL_MACHDEP	7		/* machine dependent */
175 #define	CTL_USER	8		/* user-level */
176 #define	CTL_MAXID	9		/* number of valid top-level ids */
177 
178 #define CTL_NAMES { \
179 	{ 0, 0 }, \
180 	{ "kern", CTLTYPE_NODE }, \
181 	{ "vm", CTLTYPE_NODE }, \
182 	{ "vfs", CTLTYPE_NODE }, \
183 	{ "net", CTLTYPE_NODE }, \
184 	{ "debug", CTLTYPE_NODE }, \
185 	{ "hw", CTLTYPE_NODE }, \
186 	{ "machdep", CTLTYPE_NODE }, \
187 	{ "user", CTLTYPE_NODE }, \
188 }
189 
190 /*
191  * CTL_KERN identifiers
192  */
193 #define	KERN_OSTYPE	 	 1	/* string: system version */
194 #define	KERN_OSRELEASE	 	 2	/* string: system release */
195 #define	KERN_OSREV	 	 3	/* int: system revision */
196 #define	KERN_VERSION	 	 4	/* string: compile time info */
197 #define	KERN_MAXVNODES	 	 5	/* int: max vnodes */
198 #define	KERN_MAXPROC	 	 6	/* int: max processes */
199 #define	KERN_MAXFILES	 	 7	/* int: max open files */
200 #define	KERN_ARGMAX	 	 8	/* int: max arguments to exec */
201 #define	KERN_SECURELVL	 	 9	/* int: system security level */
202 #define	KERN_HOSTNAME		10	/* string: hostname */
203 #define	KERN_HOSTID		11	/* int: host identifier */
204 #define	KERN_CLOCKRATE		12	/* struct: struct clockrate */
205 #define	KERN_VNODE		13	/* struct: vnode structures */
206 #define	KERN_PROC		14	/* struct: process entries */
207 #define	KERN_FILE		15	/* struct: file entries */
208 #define	KERN_PROF		16	/* node: kernel profiling info */
209 #define	KERN_POSIX1		17	/* int: POSIX.1 version */
210 #define	KERN_NGROUPS		18	/* int: # of supplemental group ids */
211 #define	KERN_JOB_CONTROL	19	/* int: is job control available */
212 #define	KERN_SAVED_IDS		20	/* int: saved set-user/group-ID */
213 #define	KERN_BOOTTIME		21	/* struct: time kernel was booted */
214 #define KERN_NISDOMAINNAME	22	/* string: YP domain name */
215 #define KERN_UPDATEINTERVAL	23	/* int: update process sleep time */
216 #define KERN_OSRELDATE		24	/* int: OS release date */
217 #define KERN_NTP_PLL		25	/* node: NTP PLL control */
218 #define	KERN_BOOTFILE		26	/* string: name of booted kernel */
219 #define	KERN_MAXFILESPERPROC	27	/* int: max open files per proc */
220 #define	KERN_MAXPROCPERUID 	28	/* int: max processes per uid */
221 #define KERN_DUMPDEV		29	/* dev_t: device to dump on */
222 #define	KERN_SOMAXCONN		30	/* int: max connections in listen q */
223 #define	KERN_MAXSOCKBUF		31	/* int: max size of a socket buffer */
224 #define	KERN_PS_STRINGS		32	/* int: address of PS_STRINGS */
225 #define	KERN_USRSTACK		33	/* int: address of USRSTACK */
226 #define	KERN_SOMINQUEUE		34	/* int: override socket listen() */
227 #define KERN_MAXID		35      /* number of valid kern ids */
228 
229 #define CTL_KERN_NAMES { \
230 	{ 0, 0 }, \
231 	{ "ostype", CTLTYPE_STRING }, \
232 	{ "osrelease", CTLTYPE_STRING }, \
233 	{ "osrevision", CTLTYPE_INT }, \
234 	{ "version", CTLTYPE_STRING }, \
235 	{ "maxvnodes", CTLTYPE_INT }, \
236 	{ "maxproc", CTLTYPE_INT }, \
237 	{ "maxfiles", CTLTYPE_INT }, \
238 	{ "argmax", CTLTYPE_INT }, \
239 	{ "securelevel", CTLTYPE_INT }, \
240 	{ "hostname", CTLTYPE_STRING }, \
241 	{ "hostid", CTLTYPE_INT }, \
242 	{ "clockrate", CTLTYPE_STRUCT }, \
243 	{ "vnode", CTLTYPE_STRUCT }, \
244 	{ "proc", CTLTYPE_STRUCT }, \
245 	{ "file", CTLTYPE_STRUCT }, \
246 	{ "profiling", CTLTYPE_NODE }, \
247 	{ "posix1version", CTLTYPE_INT }, \
248 	{ "ngroups", CTLTYPE_INT }, \
249 	{ "job_control", CTLTYPE_INT }, \
250 	{ "saved_ids", CTLTYPE_INT }, \
251 	{ "boottime", CTLTYPE_STRUCT }, \
252 	{ "nisdomainname", CTLTYPE_STRING }, \
253 	{ "update", CTLTYPE_INT }, \
254 	{ "osreldate", CTLTYPE_INT }, \
255         { "ntp_pll", CTLTYPE_NODE }, \
256 	{ "bootfile", CTLTYPE_STRING }, \
257 	{ "maxfilesperproc", CTLTYPE_INT }, \
258 	{ "maxprocperuid", CTLTYPE_INT }, \
259 	{ "dumpdev", CTLTYPE_STRUCT }, /* we lie; don't print as int */ \
260 	{ "somaxconn", CTLTYPE_INT }, \
261 	{ "maxsockbuf", CTLTYPE_INT }, \
262 	{ "ps_strings", CTLTYPE_INT }, \
263 	{ "usrstack", CTLTYPE_INT }, \
264 	{ "sominqueue", CTLTYPE_INT }, \
265 }
266 
267 /*
268  * CTL_VFS identifiers
269  */
270 #define VFS_VFSCONF		0	/* get configured filesystems */
271 #define VFS_MAXID		1	/* number of items */
272 
273 #define CTL_VFS_NAMES { \
274 	{ "vfsconf", CTLTYPE_STRUCT }, \
275 }
276 
277 /*
278  * KERN_PROC subtypes
279  */
280 #define KERN_PROC_ALL		0	/* everything */
281 #define	KERN_PROC_PID		1	/* by process id */
282 #define	KERN_PROC_PGRP		2	/* by process group id */
283 #define	KERN_PROC_SESSION	3	/* by session of pid */
284 #define	KERN_PROC_TTY		4	/* by controlling tty */
285 #define	KERN_PROC_UID		5	/* by effective uid */
286 #define	KERN_PROC_RUID		6	/* by real uid */
287 
288 /*
289  * CTL_HW identifiers
290  */
291 #define	HW_MACHINE	 1		/* string: machine class */
292 #define	HW_MODEL	 2		/* string: specific machine model */
293 #define	HW_NCPU		 3		/* int: number of cpus */
294 #define	HW_BYTEORDER	 4		/* int: machine byte order */
295 #define	HW_PHYSMEM	 5		/* int: total memory */
296 #define	HW_USERMEM	 6		/* int: non-kernel memory */
297 #define	HW_PAGESIZE	 7		/* int: software page size */
298 #define	HW_DISKNAMES	 8		/* strings: disk drive names */
299 #define	HW_DISKSTATS	 9		/* struct: diskstats[] */
300 #define HW_FLOATINGPT	10		/* int: has HW floating point? */
301 #define	HW_MAXID	11		/* number of valid hw ids */
302 
303 #define CTL_HW_NAMES { \
304 	{ 0, 0 }, \
305 	{ "machine", CTLTYPE_STRING }, \
306 	{ "model", CTLTYPE_STRING }, \
307 	{ "ncpu", CTLTYPE_INT }, \
308 	{ "byteorder", CTLTYPE_INT }, \
309 	{ "physmem", CTLTYPE_INT }, \
310 	{ "usermem", CTLTYPE_INT }, \
311 	{ "pagesize", CTLTYPE_INT }, \
312 	{ "disknames", CTLTYPE_STRUCT }, \
313 	{ "diskstats", CTLTYPE_STRUCT }, \
314 	{ "floatingpoint", CTLTYPE_INT }, \
315 }
316 
317 /*
318  * CTL_USER definitions
319  */
320 #define	USER_CS_PATH		 1	/* string: _CS_PATH */
321 #define	USER_BC_BASE_MAX	 2	/* int: BC_BASE_MAX */
322 #define	USER_BC_DIM_MAX		 3	/* int: BC_DIM_MAX */
323 #define	USER_BC_SCALE_MAX	 4	/* int: BC_SCALE_MAX */
324 #define	USER_BC_STRING_MAX	 5	/* int: BC_STRING_MAX */
325 #define	USER_COLL_WEIGHTS_MAX	 6	/* int: COLL_WEIGHTS_MAX */
326 #define	USER_EXPR_NEST_MAX	 7	/* int: EXPR_NEST_MAX */
327 #define	USER_LINE_MAX		 8	/* int: LINE_MAX */
328 #define	USER_RE_DUP_MAX		 9	/* int: RE_DUP_MAX */
329 #define	USER_POSIX2_VERSION	10	/* int: POSIX2_VERSION */
330 #define	USER_POSIX2_C_BIND	11	/* int: POSIX2_C_BIND */
331 #define	USER_POSIX2_C_DEV	12	/* int: POSIX2_C_DEV */
332 #define	USER_POSIX2_CHAR_TERM	13	/* int: POSIX2_CHAR_TERM */
333 #define	USER_POSIX2_FORT_DEV	14	/* int: POSIX2_FORT_DEV */
334 #define	USER_POSIX2_FORT_RUN	15	/* int: POSIX2_FORT_RUN */
335 #define	USER_POSIX2_LOCALEDEF	16	/* int: POSIX2_LOCALEDEF */
336 #define	USER_POSIX2_SW_DEV	17	/* int: POSIX2_SW_DEV */
337 #define	USER_POSIX2_UPE		18	/* int: POSIX2_UPE */
338 #define	USER_STREAM_MAX		19	/* int: POSIX2_STREAM_MAX */
339 #define	USER_TZNAME_MAX		20	/* int: POSIX2_TZNAME_MAX */
340 #define	USER_MAXID		21	/* number of valid user ids */
341 
342 #define	CTL_USER_NAMES { \
343 	{ 0, 0 }, \
344 	{ "cs_path", CTLTYPE_STRING }, \
345 	{ "bc_base_max", CTLTYPE_INT }, \
346 	{ "bc_dim_max", CTLTYPE_INT }, \
347 	{ "bc_scale_max", CTLTYPE_INT }, \
348 	{ "bc_string_max", CTLTYPE_INT }, \
349 	{ "coll_weights_max", CTLTYPE_INT }, \
350 	{ "expr_nest_max", CTLTYPE_INT }, \
351 	{ "line_max", CTLTYPE_INT }, \
352 	{ "re_dup_max", CTLTYPE_INT }, \
353 	{ "posix2_version", CTLTYPE_INT }, \
354 	{ "posix2_c_bind", CTLTYPE_INT }, \
355 	{ "posix2_c_dev", CTLTYPE_INT }, \
356 	{ "posix2_char_term", CTLTYPE_INT }, \
357 	{ "posix2_fort_dev", CTLTYPE_INT }, \
358 	{ "posix2_fort_run", CTLTYPE_INT }, \
359 	{ "posix2_localedef", CTLTYPE_INT }, \
360 	{ "posix2_sw_dev", CTLTYPE_INT }, \
361 	{ "posix2_upe", CTLTYPE_INT }, \
362 	{ "stream_max", CTLTYPE_INT }, \
363 	{ "tzname_max", CTLTYPE_INT }, \
364 }
365 
366 #ifdef KERNEL
367 
368 extern char	cpu_model[];
369 extern char	machine[];
370 extern char	osrelease[];
371 extern char	ostype[];
372 
373 int kernel_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t *oldlenp, void *new, size_t newlen, int *retval);
374 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);
375 /*
376 int	sysctl_clockrate __P((char *, size_t*));
377 int	sysctl_file __P((char *, size_t*));
378 int	sysctl_doproc __P((int *, u_int, char *, size_t*));
379 int	sysctl_doprof __P((int *, u_int, void *, size_t *, void *, size_t));
380 */
381 
382 #else	/* !KERNEL */
383 #include <sys/cdefs.h>
384 
385 __BEGIN_DECLS
386 int	sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
387 __END_DECLS
388 #endif	/* KERNEL */
389 
390 #endif	/* !_SYS_SYSCTL_H_ */
391