xref: /freebsd/sys/kern/kern_mib.c (revision cc16dea626cf2fc80cde667ac4798065108e596c)
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_NODE(, 0,	  sysctl, CTLFLAG_RW, 0,
59 	"Sysctl internal magic");
60 SYSCTL_NODE(, CTL_KERN,	  kern,   CTLFLAG_RW|CTLFLAG_CAPRD, 0,
61 	"High kernel, proc, limits &c");
62 SYSCTL_NODE(, CTL_VM,	  vm,     CTLFLAG_RW, 0,
63 	"Virtual memory");
64 SYSCTL_NODE(, CTL_VFS,	  vfs,     CTLFLAG_RW, 0,
65 	"File system");
66 SYSCTL_NODE(, CTL_NET,	  net,    CTLFLAG_RW, 0,
67 	"Network, (see socket.h)");
68 SYSCTL_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_NODE(, CTL_HW,	  hw,     CTLFLAG_RW, 0,
73 	"hardware");
74 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
75 	"machine dependent");
76 SYSCTL_NODE(, CTL_USER,	  user,   CTLFLAG_RW, 0,
77 	"user-level");
78 SYSCTL_NODE(, CTL_P1003_1B,  p1003_1b,   CTLFLAG_RW, 0,
79 	"p1003_1b, (see p1003_1b.h)");
80 
81 SYSCTL_NODE(, OID_AUTO,  compat, CTLFLAG_RW, 0,
82 	"Compatibility code");
83 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
84      	"Security");
85 #ifdef REGRESSION
86 SYSCTL_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,
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,
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|CTLFLAG_CAPRD,
131     &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 - 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 static int
265 sysctl_hostname(SYSCTL_HANDLER_ARGS)
266 {
267 	struct prison *pr, *cpr;
268 	size_t pr_offset;
269 	char tmpname[MAXHOSTNAMELEN];
270 	int descend, error, len;
271 
272 	/*
273 	 * This function can set: hostname domainname hostuuid.
274 	 * Keep that in mind when comments say "hostname".
275 	 */
276 	pr_offset = (size_t)arg1;
277 	len = arg2;
278 	KASSERT(len <= sizeof(tmpname),
279 	    ("length %d too long for %s", len, __func__));
280 
281 	pr = req->td->td_ucred->cr_prison;
282 	if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
283 		return (EPERM);
284 	/*
285 	 * Make a local copy of hostname to get/set so we don't have to hold
286 	 * the jail mutex during the sysctl copyin/copyout activities.
287 	 */
288 	mtx_lock(&pr->pr_mtx);
289 	bcopy((char *)pr + pr_offset, tmpname, len);
290 	mtx_unlock(&pr->pr_mtx);
291 
292 	error = sysctl_handle_string(oidp, tmpname, len, req);
293 
294 	if (req->newptr != NULL && error == 0) {
295 		/*
296 		 * Copy the locally set hostname to all jails that share
297 		 * this host info.
298 		 */
299 		sx_slock(&allprison_lock);
300 		while (!(pr->pr_flags & PR_HOST))
301 			pr = pr->pr_parent;
302 		mtx_lock(&pr->pr_mtx);
303 		bcopy(tmpname, (char *)pr + pr_offset, len);
304 		FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
305 			if (cpr->pr_flags & PR_HOST)
306 				descend = 0;
307 			else
308 				bcopy(tmpname, (char *)cpr + pr_offset, len);
309 		mtx_unlock(&pr->pr_mtx);
310 		sx_sunlock(&allprison_lock);
311 	}
312 	return (error);
313 }
314 
315 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
316     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
317     (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
318     sysctl_hostname, "A", "Hostname");
319 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
320     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
321     (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
322     sysctl_hostname, "A", "Name of the current YP/NIS domain");
323 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
324     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
325     (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
326     sysctl_hostname, "A", "Host UUID");
327 
328 static int	regression_securelevel_nonmonotonic = 0;
329 
330 #ifdef REGRESSION
331 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
332     &regression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
333 #endif
334 
335 static int
336 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
337 {
338 	struct prison *pr, *cpr;
339 	int descend, error, level;
340 
341 	pr = req->td->td_ucred->cr_prison;
342 
343 	/*
344 	 * Reading the securelevel is easy, since the current jail's level
345 	 * is known to be at least as secure as any higher levels.  Perform
346 	 * a lockless read since the securelevel is an integer.
347 	 */
348 	level = pr->pr_securelevel;
349 	error = sysctl_handle_int(oidp, &level, 0, req);
350 	if (error || !req->newptr)
351 		return (error);
352 	/* Permit update only if the new securelevel exceeds the old. */
353 	sx_slock(&allprison_lock);
354 	mtx_lock(&pr->pr_mtx);
355 	if (!regression_securelevel_nonmonotonic &&
356 	    level < pr->pr_securelevel) {
357 		mtx_unlock(&pr->pr_mtx);
358 		sx_sunlock(&allprison_lock);
359 		return (EPERM);
360 	}
361 	pr->pr_securelevel = level;
362 	/*
363 	 * Set all child jails to be at least this level, but do not lower
364 	 * them (even if regression_securelevel_nonmonotonic).
365 	 */
366 	FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
367 		if (cpr->pr_securelevel < level)
368 			cpr->pr_securelevel = level;
369 	}
370 	mtx_unlock(&pr->pr_mtx);
371 	sx_sunlock(&allprison_lock);
372 	return (error);
373 }
374 
375 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
376     CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
377     "I", "Current secure level");
378 
379 #ifdef INCLUDE_CONFIG_FILE
380 /* Actual kernel configuration options. */
381 extern char kernconfstring[];
382 
383 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD, kernconfstring, 0,
384     "Kernel configuration file");
385 #endif
386 
387 static int
388 sysctl_hostid(SYSCTL_HANDLER_ARGS)
389 {
390 	struct prison *pr, *cpr;
391 	u_long tmpid;
392 	int descend, error;
393 
394 	/*
395 	 * Like sysctl_hostname, except it operates on a u_long
396 	 * instead of a string, and is used only for hostid.
397 	 */
398 	pr = req->td->td_ucred->cr_prison;
399 	if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
400 		return (EPERM);
401 	tmpid = pr->pr_hostid;
402 	error = sysctl_handle_long(oidp, &tmpid, 0, req);
403 
404 	if (req->newptr != NULL && error == 0) {
405 		sx_slock(&allprison_lock);
406 		while (!(pr->pr_flags & PR_HOST))
407 			pr = pr->pr_parent;
408 		mtx_lock(&pr->pr_mtx);
409 		pr->pr_hostid = tmpid;
410 		FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
411 			if (cpr->pr_flags & PR_HOST)
412 				descend = 0;
413 			else
414 				cpr->pr_hostid = tmpid;
415 		mtx_unlock(&pr->pr_mtx);
416 		sx_sunlock(&allprison_lock);
417 	}
418 	return (error);
419 }
420 
421 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
422     CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
423     NULL, 0, sysctl_hostid, "LU", "Host ID");
424 
425 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
426 
427 #ifdef COMPAT_FREEBSD4
428 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
429 #endif
430 
431 #ifdef COMPAT_FREEBSD5
432 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
433 #endif
434 
435 #ifdef COMPAT_FREEBSD6
436 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
437 #endif
438 
439 #ifdef COMPAT_FREEBSD7
440 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
441 #endif
442 
443 /*
444  * This is really cheating.  These actually live in the libc, something
445  * which I'm not quite sure is a good idea anyway, but in order for
446  * getnext and friends to actually work, we define dummies here.
447  *
448  * XXXRW: These probably should be CTLFLAG_CAPRD.
449  */
450 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
451     "", 0, "PATH that finds all the standard utilities");
452 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
453     0, 0, "Max ibase/obase values in bc(1)");
454 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
455     0, 0, "Max array size in bc(1)");
456 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
457     0, 0, "Max scale value in bc(1)");
458 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
459     0, 0, "Max string length in bc(1)");
460 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
461     0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
462 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
463 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
464     0, 0, "Max length (bytes) of a text-processing utility's input line");
465 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
466     0, 0, "Maximum number of repeats of a regexp permitted");
467 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
468     0, 0,
469     "The version of POSIX 1003.2 with which the system attempts to comply");
470 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
471     0, 0, "Whether C development supports the C bindings option");
472 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
473     0, 0, "Whether system supports the C development utilities option");
474 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
475     0, 0, "");
476 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
477     0, 0, "Whether system supports FORTRAN development utilities");
478 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
479     0, 0, "Whether system supports FORTRAN runtime utilities");
480 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
481     0, 0, "Whether system supports creation of locales");
482 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
483     0, 0, "Whether system supports software development utilities");
484 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
485     0, 0, "Whether system supports the user portability utilities");
486 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
487     0, 0, "Min Maximum number of streams a process may have open at one time");
488 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
489     0, 0, "Min Maximum number of types supported for timezone names");
490 
491 #include <sys/vnode.h>
492 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
493     0, sizeof(struct vnode), "sizeof(struct vnode)");
494 
495 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
496     0, sizeof(struct proc), "sizeof(struct proc)");
497 
498 static int
499 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS)
500 {
501 	int error, pm;
502 
503 	pm = pid_max;
504 	error = sysctl_handle_int(oidp, &pm, 0, req);
505 	if (error || !req->newptr)
506 		return (error);
507 	sx_xlock(&proctree_lock);
508 	sx_xlock(&allproc_lock);
509 
510 	/*
511 	 * Only permit the values less then PID_MAX.
512 	 * As a safety measure, do not allow to limit the pid_max too much.
513 	 */
514 	if (pm < 300 || pm > PID_MAX)
515 		error = EINVAL;
516 	else
517 		pid_max = pm;
518 	sx_xunlock(&allproc_lock);
519 	sx_xunlock(&proctree_lock);
520 	return (error);
521 }
522 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_TUN |
523     CTLFLAG_MPSAFE, 0, 0, sysctl_kern_pid_max, "I",
524     "Maximum allowed pid");
525 
526 #include <sys/bio.h>
527 #include <sys/buf.h>
528 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
529     0, sizeof(struct bio), "sizeof(struct bio)");
530 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
531     0, sizeof(struct buf), "sizeof(struct buf)");
532 
533 #include <sys/user.h>
534 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
535     0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
536 
537 /* XXX compatibility, remove for 6.0 */
538 #include <sys/imgact.h>
539 #include <sys/imgact_elf.h>
540 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
541     &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
542     "compatibility for kern.fallback_elf_brand");
543