xref: /freebsd/sys/kern/kern_mib.c (revision ee7b0571c2c18bdec848ed2044223cc88db29bd8)
1 /*-
2  * Copyright (c) 1982, 1986, 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  * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
9  * project, to make these variables more userfriendly.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  *
35  *	@(#)kern_sysctl.c	8.4 (Berkeley) 4/14/94
36  */
37 
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40 
41 #include "opt_compat.h"
42 #include "opt_posix.h"
43 #include "opt_config.h"
44 
45 #include <sys/param.h>
46 #include <sys/kernel.h>
47 #include <sys/sbuf.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
50 #include <sys/proc.h>
51 #include <sys/lock.h>
52 #include <sys/mutex.h>
53 #include <sys/jail.h>
54 #include <sys/smp.h>
55 #include <sys/sx.h>
56 #include <sys/unistd.h>
57 
58 SYSCTL_ROOT_NODE(0,	  sysctl, CTLFLAG_RW, 0,
59 	"Sysctl internal magic");
60 SYSCTL_ROOT_NODE(CTL_KERN,	  kern,   CTLFLAG_RW|CTLFLAG_CAPRD, 0,
61 	"High kernel, proc, limits &c");
62 SYSCTL_ROOT_NODE(CTL_VM,	  vm,     CTLFLAG_RW, 0,
63 	"Virtual memory");
64 SYSCTL_ROOT_NODE(CTL_VFS,	  vfs,     CTLFLAG_RW, 0,
65 	"File system");
66 SYSCTL_ROOT_NODE(CTL_NET,	  net,    CTLFLAG_RW, 0,
67 	"Network, (see socket.h)");
68 SYSCTL_ROOT_NODE(CTL_DEBUG,  debug,  CTLFLAG_RW, 0,
69 	"Debugging");
70 SYSCTL_NODE(_debug, OID_AUTO,  sizeof,  CTLFLAG_RW, 0,
71 	"Sizeof various things");
72 SYSCTL_ROOT_NODE(CTL_HW,	  hw,     CTLFLAG_RW, 0,
73 	"hardware");
74 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
75 	"machine dependent");
76 SYSCTL_ROOT_NODE(CTL_USER,	  user,   CTLFLAG_RW, 0,
77 	"user-level");
78 SYSCTL_ROOT_NODE(CTL_P1003_1B,  p1003_1b,   CTLFLAG_RW, 0,
79 	"p1003_1b, (see p1003_1b.h)");
80 
81 SYSCTL_ROOT_NODE(OID_AUTO,  compat, CTLFLAG_RW, 0,
82 	"Compatibility code");
83 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW, 0,
84      	"Security");
85 #ifdef REGRESSION
86 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW, 0,
87      "Regression test MIB");
88 #endif
89 
90 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE,
91     kern_ident, 0, "Kernel identifier");
92 
93 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD|CTLFLAG_MPSAFE|
94     CTLFLAG_CAPRD, osrelease, 0, "Operating system release");
95 
96 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD,
97     0, BSD, "Operating system revision");
98 
99 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE,
100     version, 0, "Kernel version");
101 
102 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE,
103     compiler_version, 0, "Version of compiler used to compile kernel");
104 
105 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE|
106     CTLFLAG_CAPRD, ostype, 0, "Operating system type");
107 
108 /*
109  * NOTICE: The *userland* release date is available in
110  * /usr/include/osreldate.h
111  */
112 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD|CTLFLAG_CAPRD,
113     &osreldate, 0, "Kernel release date");
114 
115 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
116     &maxproc, 0, "Maximum number of processes");
117 
118 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
119     &maxprocperuid, 0, "Maximum processes allowed per userid");
120 
121 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
122     &maxusers, 0, "Hint for kernel tuning");
123 
124 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD,
125     0, ARG_MAX, "Maximum bytes of argument to execve(2)");
126 
127 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD,
128     0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
129 
130 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN |
131     CTLFLAG_NOFETCH | CTLFLAG_CAPRD, &ngroups_max, 0,
132     "Maximum number of supplemental groups a user can belong to");
133 
134 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD,
135     0, 1, "Whether job control is available");
136 
137 #ifdef _POSIX_SAVED_IDS
138 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
139     0, 1, "Whether saved set-group/user ID is available");
140 #else
141 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
142     0, 0, "Whether saved set-group/user ID is available");
143 #endif
144 
145 char kernelname[MAXPATHLEN] = "/kernel";	/* XXX bloat */
146 
147 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
148     kernelname, sizeof kernelname, "Name of kernel file booted");
149 
150 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD,
151     &mp_ncpus, 0, "Number of active CPUs");
152 
153 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD,
154     0, BYTE_ORDER, "System byte order");
155 
156 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD,
157     0, PAGE_SIZE, "System memory page size");
158 
159 static int
160 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
161 {
162 	char buf[256];
163 	size_t len;
164 
165 	len = req->oldlen;
166 	if (len > sizeof(buf))
167 		len = sizeof(buf);
168 	arc4rand(buf, len, 0);
169 	return (SYSCTL_OUT(req, buf, len));
170 }
171 
172 SYSCTL_PROC(_kern, KERN_ARND, arandom,
173     CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0,
174     sysctl_kern_arnd, "", "arc4rand");
175 
176 static int
177 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
178 {
179 	u_long val;
180 
181 	val = ctob(physmem);
182 	return (sysctl_handle_long(oidp, &val, 0, req));
183 }
184 
185 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
186 	0, 0, sysctl_hw_physmem, "LU", "");
187 
188 static int
189 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
190 {
191 	u_long val;
192 	val = ctob(realmem);
193 	return (sysctl_handle_long(oidp, &val, 0, req));
194 }
195 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
196 	0, 0, sysctl_hw_realmem, "LU", "");
197 static int
198 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
199 {
200 	u_long val;
201 
202 	val = ctob(physmem - vm_cnt.v_wire_count);
203 	return (sysctl_handle_long(oidp, &val, 0, req));
204 }
205 
206 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
207 	0, 0, sysctl_hw_usermem, "LU", "");
208 
209 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
210 
211 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE };
212 
213 static int
214 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)
215 {
216 	int error;
217 #ifdef SCTL_MASK32
218 	int i;
219 	uint32_t pagesizes32[MAXPAGESIZES];
220 
221 	if (req->flags & SCTL_MASK32) {
222 		/*
223 		 * Recreate the "pagesizes" array with 32-bit elements.  Truncate
224 		 * any page size greater than UINT32_MAX to zero.
225 		 */
226 		for (i = 0; i < MAXPAGESIZES; i++)
227 			pagesizes32[i] = (uint32_t)pagesizes[i];
228 
229 		error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32));
230 	} else
231 #endif
232 		error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes));
233 	return (error);
234 }
235 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD,
236     NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes");
237 
238 #ifdef SCTL_MASK32
239 int adaptive_machine_arch = 1;
240 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW,
241     &adaptive_machine_arch, 1,
242     "Adapt reported machine architecture to the ABI of the binary");
243 #endif
244 
245 static int
246 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)
247 {
248 	int error;
249 	static const char machine_arch[] = MACHINE_ARCH;
250 #ifdef SCTL_MASK32
251 	static const char machine_arch32[] = MACHINE_ARCH32;
252 
253 	if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch)
254 		error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32));
255 	else
256 #endif
257 		error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch));
258 	return (error);
259 
260 }
261 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD,
262     NULL, 0, sysctl_hw_machine_arch, "A", "System architecture");
263 
264 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE,
265 #ifdef COMPAT_FREEBSD32
266     MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries");
267 #else
268     MACHINE_ARCH, 0, "Supported architectures for binaries");
269 #endif
270 
271 static int
272 sysctl_hostname(SYSCTL_HANDLER_ARGS)
273 {
274 	struct prison *pr, *cpr;
275 	size_t pr_offset;
276 	char tmpname[MAXHOSTNAMELEN];
277 	int descend, error, len;
278 
279 	/*
280 	 * This function can set: hostname domainname hostuuid.
281 	 * Keep that in mind when comments say "hostname".
282 	 */
283 	pr_offset = (size_t)arg1;
284 	len = arg2;
285 	KASSERT(len <= sizeof(tmpname),
286 	    ("length %d too long for %s", len, __func__));
287 
288 	pr = req->td->td_ucred->cr_prison;
289 	if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
290 		return (EPERM);
291 	/*
292 	 * Make a local copy of hostname to get/set so we don't have to hold
293 	 * the jail mutex during the sysctl copyin/copyout activities.
294 	 */
295 	mtx_lock(&pr->pr_mtx);
296 	bcopy((char *)pr + pr_offset, tmpname, len);
297 	mtx_unlock(&pr->pr_mtx);
298 
299 	error = sysctl_handle_string(oidp, tmpname, len, req);
300 
301 	if (req->newptr != NULL && error == 0) {
302 		/*
303 		 * Copy the locally set hostname to all jails that share
304 		 * this host info.
305 		 */
306 		sx_slock(&allprison_lock);
307 		while (!(pr->pr_flags & PR_HOST))
308 			pr = pr->pr_parent;
309 		mtx_lock(&pr->pr_mtx);
310 		bcopy(tmpname, (char *)pr + pr_offset, len);
311 		FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
312 			if (cpr->pr_flags & PR_HOST)
313 				descend = 0;
314 			else
315 				bcopy(tmpname, (char *)cpr + pr_offset, len);
316 		mtx_unlock(&pr->pr_mtx);
317 		sx_sunlock(&allprison_lock);
318 	}
319 	return (error);
320 }
321 
322 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
323     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
324     (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
325     sysctl_hostname, "A", "Hostname");
326 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
327     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
328     (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
329     sysctl_hostname, "A", "Name of the current YP/NIS domain");
330 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
331     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
332     (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
333     sysctl_hostname, "A", "Host UUID");
334 
335 static int	regression_securelevel_nonmonotonic = 0;
336 
337 #ifdef REGRESSION
338 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
339     &regression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
340 #endif
341 
342 static int
343 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
344 {
345 	struct prison *pr, *cpr;
346 	int descend, error, level;
347 
348 	pr = req->td->td_ucred->cr_prison;
349 
350 	/*
351 	 * Reading the securelevel is easy, since the current jail's level
352 	 * is known to be at least as secure as any higher levels.  Perform
353 	 * a lockless read since the securelevel is an integer.
354 	 */
355 	level = pr->pr_securelevel;
356 	error = sysctl_handle_int(oidp, &level, 0, req);
357 	if (error || !req->newptr)
358 		return (error);
359 	/* Permit update only if the new securelevel exceeds the old. */
360 	sx_slock(&allprison_lock);
361 	mtx_lock(&pr->pr_mtx);
362 	if (!regression_securelevel_nonmonotonic &&
363 	    level < pr->pr_securelevel) {
364 		mtx_unlock(&pr->pr_mtx);
365 		sx_sunlock(&allprison_lock);
366 		return (EPERM);
367 	}
368 	pr->pr_securelevel = level;
369 	/*
370 	 * Set all child jails to be at least this level, but do not lower
371 	 * them (even if regression_securelevel_nonmonotonic).
372 	 */
373 	FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
374 		if (cpr->pr_securelevel < level)
375 			cpr->pr_securelevel = level;
376 	}
377 	mtx_unlock(&pr->pr_mtx);
378 	sx_sunlock(&allprison_lock);
379 	return (error);
380 }
381 
382 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
383     CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
384     "I", "Current secure level");
385 
386 #ifdef INCLUDE_CONFIG_FILE
387 /* Actual kernel configuration options. */
388 extern char kernconfstring[];
389 
390 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD, kernconfstring, 0,
391     "Kernel configuration file");
392 #endif
393 
394 static int
395 sysctl_hostid(SYSCTL_HANDLER_ARGS)
396 {
397 	struct prison *pr, *cpr;
398 	u_long tmpid;
399 	int descend, error;
400 
401 	/*
402 	 * Like sysctl_hostname, except it operates on a u_long
403 	 * instead of a string, and is used only for hostid.
404 	 */
405 	pr = req->td->td_ucred->cr_prison;
406 	if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
407 		return (EPERM);
408 	tmpid = pr->pr_hostid;
409 	error = sysctl_handle_long(oidp, &tmpid, 0, req);
410 
411 	if (req->newptr != NULL && error == 0) {
412 		sx_slock(&allprison_lock);
413 		while (!(pr->pr_flags & PR_HOST))
414 			pr = pr->pr_parent;
415 		mtx_lock(&pr->pr_mtx);
416 		pr->pr_hostid = tmpid;
417 		FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
418 			if (cpr->pr_flags & PR_HOST)
419 				descend = 0;
420 			else
421 				cpr->pr_hostid = tmpid;
422 		mtx_unlock(&pr->pr_mtx);
423 		sx_sunlock(&allprison_lock);
424 	}
425 	return (error);
426 }
427 
428 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
429     CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
430     NULL, 0, sysctl_hostid, "LU", "Host ID");
431 
432 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
433 
434 #ifdef COMPAT_FREEBSD4
435 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
436 #endif
437 
438 #ifdef COMPAT_FREEBSD5
439 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
440 #endif
441 
442 #ifdef COMPAT_FREEBSD6
443 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
444 #endif
445 
446 #ifdef COMPAT_FREEBSD7
447 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
448 #endif
449 
450 /*
451  * This is really cheating.  These actually live in the libc, something
452  * which I'm not quite sure is a good idea anyway, but in order for
453  * getnext and friends to actually work, we define dummies here.
454  *
455  * XXXRW: These probably should be CTLFLAG_CAPRD.
456  */
457 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
458     "", 0, "PATH that finds all the standard utilities");
459 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
460     0, 0, "Max ibase/obase values in bc(1)");
461 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
462     0, 0, "Max array size in bc(1)");
463 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
464     0, 0, "Max scale value in bc(1)");
465 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
466     0, 0, "Max string length in bc(1)");
467 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
468     0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
469 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
470 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
471     0, 0, "Max length (bytes) of a text-processing utility's input line");
472 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
473     0, 0, "Maximum number of repeats of a regexp permitted");
474 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
475     0, 0,
476     "The version of POSIX 1003.2 with which the system attempts to comply");
477 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
478     0, 0, "Whether C development supports the C bindings option");
479 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
480     0, 0, "Whether system supports the C development utilities option");
481 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
482     0, 0, "");
483 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
484     0, 0, "Whether system supports FORTRAN development utilities");
485 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
486     0, 0, "Whether system supports FORTRAN runtime utilities");
487 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
488     0, 0, "Whether system supports creation of locales");
489 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
490     0, 0, "Whether system supports software development utilities");
491 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
492     0, 0, "Whether system supports the user portability utilities");
493 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
494     0, 0, "Min Maximum number of streams a process may have open at one time");
495 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
496     0, 0, "Min Maximum number of types supported for timezone names");
497 
498 #include <sys/vnode.h>
499 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
500     0, sizeof(struct vnode), "sizeof(struct vnode)");
501 
502 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
503     0, sizeof(struct proc), "sizeof(struct proc)");
504 
505 static int
506 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS)
507 {
508 	int error, pm;
509 
510 	pm = pid_max;
511 	error = sysctl_handle_int(oidp, &pm, 0, req);
512 	if (error || !req->newptr)
513 		return (error);
514 	sx_xlock(&proctree_lock);
515 	sx_xlock(&allproc_lock);
516 
517 	/*
518 	 * Only permit the values less then PID_MAX.
519 	 * As a safety measure, do not allow to limit the pid_max too much.
520 	 */
521 	if (pm < 300 || pm > PID_MAX)
522 		error = EINVAL;
523 	else
524 		pid_max = pm;
525 	sx_xunlock(&allproc_lock);
526 	sx_xunlock(&proctree_lock);
527 	return (error);
528 }
529 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT |
530     CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE,
531     0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid");
532 
533 #include <sys/bio.h>
534 #include <sys/buf.h>
535 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
536     0, sizeof(struct bio), "sizeof(struct bio)");
537 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
538     0, sizeof(struct buf), "sizeof(struct buf)");
539 
540 #include <sys/user.h>
541 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
542     0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
543 
544 /* XXX compatibility, remove for 6.0 */
545 #include <sys/imgact.h>
546 #include <sys/imgact_elf.h>
547 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
548     &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
549     "compatibility for kern.fallback_elf_brand");
550