2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Mike Karels at Berkeley Software Design, Inc.
10 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
11 * project, to make these variables more userfriendly.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
43 #include "opt_posix.h"
44 #include "opt_config.h"
46 #include <sys/param.h>
49 #include <sys/kernel.h>
50 #include <sys/limits.h>
52 #include <sys/mutex.h>
54 #include <sys/random.h>
58 #include <sys/vmmeter.h>
59 #include <sys/sysctl.h>
60 #include <sys/systm.h>
61 #include <sys/unistd.h>
63 SYSCTL_ROOT_NODE(0, sysctl, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
64 "Sysctl internal magic");
65 SYSCTL_ROOT_NODE(CTL_KERN, kern, CTLFLAG_RW | CTLFLAG_CAPRD | CTLFLAG_MPSAFE, 0,
66 "High kernel, proc, limits &c");
67 SYSCTL_ROOT_NODE(CTL_VM, vm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
69 SYSCTL_ROOT_NODE(CTL_VFS, vfs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
71 SYSCTL_ROOT_NODE(CTL_NET, net, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
72 "Network, (see socket.h)");
73 SYSCTL_ROOT_NODE(CTL_DEBUG, debug, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
75 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
76 "Sizeof various things");
77 SYSCTL_ROOT_NODE(CTL_HW, hw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
79 SYSCTL_ROOT_NODE(CTL_MACHDEP, machdep, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
81 SYSCTL_NODE(_machdep, OID_AUTO, mitigations, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
82 "Machine dependent platform mitigations.");
83 SYSCTL_ROOT_NODE(CTL_USER, user, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
85 SYSCTL_ROOT_NODE(CTL_P1003_1B, p1003_1b, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
86 "p1003_1b, (see p1003_1b.h)");
88 SYSCTL_ROOT_NODE(OID_AUTO, compat, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
89 "Compatibility code");
90 SYSCTL_ROOT_NODE(OID_AUTO, security, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
93 SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
94 "Regression test MIB");
97 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE,
98 kern_ident, 0, "Kernel identifier");
100 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD,
101 SYSCTL_NULL_INT_PTR, BSD, "Operating system revision");
103 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE,
104 version, 0, "Kernel version");
106 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE,
107 compiler_version, 0, "Version of compiler used to compile kernel");
109 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE|
110 CTLFLAG_CAPRD, ostype, 0, "Operating system type");
112 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
113 &maxproc, 0, "Maximum number of processes");
115 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
116 &maxprocperuid, 0, "Maximum processes allowed per userid");
118 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
119 &maxusers, 0, "Hint for kernel tuning");
121 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD,
122 SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)");
124 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD,
125 SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to");
127 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN |
128 CTLFLAG_NOFETCH | CTLFLAG_CAPRD, &ngroups_max, 0,
129 "Maximum number of supplemental groups a user can belong to");
131 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD,
132 SYSCTL_NULL_INT_PTR, 1, "Whether job control is available");
134 #ifdef _POSIX_SAVED_IDS
135 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
136 SYSCTL_NULL_INT_PTR, 1, "Whether saved set-group/user ID is available");
138 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
139 SYSCTL_NULL_INT_PTR, 0, "Whether saved set-group/user ID is available");
142 char kernelname[MAXPATHLEN] = PATH_KERNEL; /* XXX bloat */
144 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW | CTLFLAG_MPSAFE,
145 kernelname, sizeof kernelname, "Name of kernel file booted");
147 SYSCTL_INT(_kern, KERN_MAXPHYS, maxphys, CTLFLAG_RD | CTLFLAG_CAPRD,
148 SYSCTL_NULL_INT_PTR, MAXPHYS, "Maximum block I/O access size");
150 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD,
151 &mp_ncpus, 0, "Number of active CPUs");
153 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD,
154 SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order");
156 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD,
157 SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size");
160 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
165 len = MIN(req->oldlen, sizeof(buf));
166 read_random(buf, len);
167 return (SYSCTL_OUT(req, buf, len));
170 SYSCTL_PROC(_kern, KERN_ARND, arandom,
171 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0,
172 sysctl_kern_arnd, "", "arc4rand");
175 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
179 p = SIZE_T_MAX >> PAGE_SHIFT;
183 return (sysctl_handle_long(oidp, &val, 0, req));
185 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem,
186 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
187 sysctl_hw_physmem, "LU",
188 "Amount of physical memory (in bytes)");
191 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
195 p = SIZE_T_MAX >> PAGE_SHIFT;
199 return (sysctl_handle_long(oidp, &val, 0, req));
201 SYSCTL_PROC(_hw, HW_REALMEM, realmem,
202 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
203 sysctl_hw_realmem, "LU",
204 "Amount of memory (in bytes) reported by the firmware");
207 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
211 p1 = physmem - vm_wire_count();
212 p = SIZE_T_MAX >> PAGE_SHIFT;
216 return (sysctl_handle_long(oidp, &val, 0, req));
218 SYSCTL_PROC(_hw, HW_USERMEM, usermem,
219 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
220 sysctl_hw_usermem, "LU",
221 "Amount of memory (in bytes) which is not wired");
223 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0,
224 "Amount of physical memory (in pages)");
226 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE };
229 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)
234 uint32_t pagesizes32[MAXPAGESIZES];
236 if (req->flags & SCTL_MASK32) {
238 * Recreate the "pagesizes" array with 32-bit elements. Truncate
239 * any page size greater than UINT32_MAX to zero.
241 for (i = 0; i < MAXPAGESIZES; i++)
242 pagesizes32[i] = (uint32_t)pagesizes[i];
244 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32));
247 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes));
250 SYSCTL_PROC(_hw, OID_AUTO, pagesizes,
251 CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
252 sysctl_hw_pagesizes, "LU",
253 "Supported page sizes");
256 int adaptive_machine_arch = 1;
257 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW,
258 &adaptive_machine_arch, 1,
259 "Adapt reported machine architecture to the ABI of the binary");
263 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)
266 static const char machine_arch[] = MACHINE_ARCH;
268 static const char machine_arch32[] = MACHINE_ARCH32;
270 if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch)
271 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32));
274 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch));
278 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD |
279 CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine_arch, "A",
280 "System architecture");
282 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE,
283 #ifdef COMPAT_FREEBSD32
284 MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries");
286 MACHINE_ARCH, 0, "Supported architectures for binaries");
290 sysctl_hostname(SYSCTL_HANDLER_ARGS)
292 struct prison *pr, *cpr;
294 char tmpname[MAXHOSTNAMELEN];
295 int descend, error, len;
298 * This function can set: hostname domainname hostuuid.
299 * Keep that in mind when comments say "hostname".
301 pr_offset = (size_t)arg1;
303 KASSERT(len <= sizeof(tmpname),
304 ("length %d too long for %s", len, __func__));
306 pr = req->td->td_ucred->cr_prison;
307 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
310 * Make a local copy of hostname to get/set so we don't have to hold
311 * the jail mutex during the sysctl copyin/copyout activities.
313 mtx_lock(&pr->pr_mtx);
314 bcopy((char *)pr + pr_offset, tmpname, len);
315 mtx_unlock(&pr->pr_mtx);
317 error = sysctl_handle_string(oidp, tmpname, len, req);
319 if (req->newptr != NULL && error == 0) {
321 * Copy the locally set hostname to all jails that share
324 sx_slock(&allprison_lock);
325 while (!(pr->pr_flags & PR_HOST))
327 mtx_lock(&pr->pr_mtx);
328 bcopy(tmpname, (char *)pr + pr_offset, len);
329 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
330 if (cpr->pr_flags & PR_HOST)
333 bcopy(tmpname, (char *)cpr + pr_offset, len);
334 mtx_unlock(&pr->pr_mtx);
335 sx_sunlock(&allprison_lock);
340 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
341 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
342 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
343 sysctl_hostname, "A", "Hostname");
344 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
345 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
346 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
347 sysctl_hostname, "A", "Name of the current YP/NIS domain");
348 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
349 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_CAPRD | CTLFLAG_MPSAFE,
350 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
351 sysctl_hostname, "A", "Host UUID");
353 static int regression_securelevel_nonmonotonic = 0;
356 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
357 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
361 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
363 struct prison *pr, *cpr;
364 int descend, error, level;
366 pr = req->td->td_ucred->cr_prison;
369 * Reading the securelevel is easy, since the current jail's level
370 * is known to be at least as secure as any higher levels. Perform
371 * a lockless read since the securelevel is an integer.
373 level = pr->pr_securelevel;
374 error = sysctl_handle_int(oidp, &level, 0, req);
375 if (error || !req->newptr)
377 /* Permit update only if the new securelevel exceeds the old. */
378 sx_slock(&allprison_lock);
379 mtx_lock(&pr->pr_mtx);
380 if (!regression_securelevel_nonmonotonic &&
381 level < pr->pr_securelevel) {
382 mtx_unlock(&pr->pr_mtx);
383 sx_sunlock(&allprison_lock);
386 pr->pr_securelevel = level;
388 * Set all child jails to be at least this level, but do not lower
389 * them (even if regression_securelevel_nonmonotonic).
391 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
392 if (cpr->pr_securelevel < level)
393 cpr->pr_securelevel = level;
395 mtx_unlock(&pr->pr_mtx);
396 sx_sunlock(&allprison_lock);
400 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
401 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 0, 0,
402 sysctl_kern_securelvl, "I",
403 "Current secure level");
405 #ifdef INCLUDE_CONFIG_FILE
406 /* Actual kernel configuration options. */
407 extern char kernconfstring[];
409 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD | CTLFLAG_MPSAFE,
410 kernconfstring, 0, "Kernel configuration file");
414 sysctl_hostid(SYSCTL_HANDLER_ARGS)
416 struct prison *pr, *cpr;
421 * Like sysctl_hostname, except it operates on a u_long
422 * instead of a string, and is used only for hostid.
424 pr = req->td->td_ucred->cr_prison;
425 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
427 tmpid = pr->pr_hostid;
428 error = sysctl_handle_long(oidp, &tmpid, 0, req);
430 if (req->newptr != NULL && error == 0) {
431 sx_slock(&allprison_lock);
432 while (!(pr->pr_flags & PR_HOST))
434 mtx_lock(&pr->pr_mtx);
435 pr->pr_hostid = tmpid;
436 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
437 if (cpr->pr_flags & PR_HOST)
440 cpr->pr_hostid = tmpid;
441 mtx_unlock(&pr->pr_mtx);
442 sx_sunlock(&allprison_lock);
447 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
448 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE | CTLFLAG_CAPRD,
449 NULL, 0, sysctl_hostid, "LU", "Host ID");
451 static struct mtx bootid_lk;
452 MTX_SYSINIT(bootid_lock, &bootid_lk, "bootid generator lock", MTX_DEF);
455 sysctl_bootid(SYSCTL_HANDLER_ARGS)
457 static uint8_t boot_id[16];
458 static bool initialized = false;
460 mtx_lock(&bootid_lk);
462 if (!is_random_seeded()) {
463 mtx_unlock(&bootid_lk);
466 arc4random_buf(boot_id, sizeof(boot_id));
469 mtx_unlock(&bootid_lk);
471 return (SYSCTL_OUT(req, boot_id, sizeof(boot_id)));
473 SYSCTL_PROC(_kern, OID_AUTO, boot_id,
474 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD,
475 NULL, 0, sysctl_bootid, "", "Random boot ID");
478 * The osrelease string is copied from the global (osrelease in vers.c) into
479 * prison0 by a sysinit and is inherited by child jails if not changed at jail
480 * creation, so we always return the copy from the current prison data.
483 sysctl_osrelease(SYSCTL_HANDLER_ARGS)
487 pr = req->td->td_ucred->cr_prison;
488 return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1));
492 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease,
493 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
494 NULL, 0, sysctl_osrelease, "A", "Operating system release");
497 * The osreldate number is copied from the global (osreldate in vers.c) into
498 * prison0 by a sysinit and is inherited by child jails if not changed at jail
499 * creation, so we always return the value from the current prison data.
502 sysctl_osreldate(SYSCTL_HANDLER_ARGS)
506 pr = req->td->td_ucred->cr_prison;
507 return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate)));
512 * NOTICE: The *userland* release date is available in
513 * /usr/include/osreldate.h
515 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate,
516 CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
517 NULL, 0, sysctl_osreldate, "I", "Kernel release date");
520 * The build-id is copied from the ELF section .note.gnu.build-id. The linker
521 * script defines two variables to expose the beginning and end. LLVM
522 * currently uses a SHA-1 hash, but other formats can be supported by checking
523 * the length of the section.
526 extern char __build_id_start[];
527 extern char __build_id_end[];
529 #define BUILD_ID_HEADER_LEN 0x10
530 #define BUILD_ID_HASH_MAXLEN 0x14
533 sysctl_build_id(SYSCTL_HANDLER_ARGS)
535 uintptr_t sectionlen = (uintptr_t)(__build_id_end - __build_id_start);
537 char buf[2*BUILD_ID_HASH_MAXLEN+1];
540 * The ELF note section has a four byte length for the vendor name,
541 * four byte length for the value, and a four byte vendor specific
542 * type. The name for the build id is "GNU\0". We skip the first 16
543 * bytes to read the build hash. We will return the remaining bytes up
544 * to 20 (SHA-1) hash size. If the hash happens to be a custom number
545 * of bytes we will pad the value with zeros, as the section should be
548 if (sectionlen <= BUILD_ID_HEADER_LEN ||
549 sectionlen > (BUILD_ID_HEADER_LEN + BUILD_ID_HASH_MAXLEN)) {
553 hashlen = sectionlen - BUILD_ID_HEADER_LEN;
554 for (int i = 0; i < hashlen; i++) {
555 uint8_t c = __build_id_start[i+BUILD_ID_HEADER_LEN];
556 snprintf(&buf[2*i], 3, "%02x", c);
559 return (SYSCTL_OUT(req, buf, strlen(buf) + 1));
562 SYSCTL_PROC(_kern, OID_AUTO, build_id,
563 CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
564 NULL, 0, sysctl_build_id, "A", "Operating system build-id");
566 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
569 #ifdef COMPAT_FREEBSD4
570 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
573 #ifdef COMPAT_FREEBSD5
574 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
577 #ifdef COMPAT_FREEBSD6
578 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
581 #ifdef COMPAT_FREEBSD7
582 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
586 * This is really cheating. These actually live in the libc, something
587 * which I'm not quite sure is a good idea anyway, but in order for
588 * getnext and friends to actually work, we define dummies here.
590 * XXXRW: These probably should be CTLFLAG_CAPRD.
592 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
593 "", 0, "PATH that finds all the standard utilities");
594 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
595 SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)");
596 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
597 SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)");
598 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
599 SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)");
600 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
601 SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)");
602 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
603 SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
604 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD,
605 SYSCTL_NULL_INT_PTR, 0, "");
606 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
607 SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line");
608 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
609 SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted");
610 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
611 SYSCTL_NULL_INT_PTR, 0,
612 "The version of POSIX 1003.2 with which the system attempts to comply");
613 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
614 SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option");
615 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
616 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option");
617 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
618 SYSCTL_NULL_INT_PTR, 0, "");
619 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
620 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities");
621 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
622 SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities");
623 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
624 SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales");
625 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
626 SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities");
627 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
628 SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities");
629 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
630 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time");
631 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
632 SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names");
634 #include <sys/vnode.h>
635 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
636 SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)");
638 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
639 SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)");
642 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS)
647 error = sysctl_handle_int(oidp, &pm, 0, req);
648 if (error || !req->newptr)
650 sx_xlock(&proctree_lock);
651 sx_xlock(&allproc_lock);
654 * Only permit the values less then PID_MAX.
655 * As a safety measure, do not allow to limit the pid_max too much.
657 if (pm < 300 || pm > PID_MAX)
661 sx_xunlock(&allproc_lock);
662 sx_xunlock(&proctree_lock);
665 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT |
666 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE,
667 0, 0, sysctl_kern_pid_max, "I", "Maximum allowed pid");
671 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
672 SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)");
673 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
674 SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)");
676 #include <sys/user.h>
677 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
678 SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
680 /* Used by kernel debuggers. */
681 const int pcb_size = sizeof(struct pcb);
682 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD,
683 SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)");
685 /* XXX compatibility, remove for 6.0 */
686 #include <sys/imgact.h>
687 #include <sys/imgact_elf.h>
688 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
689 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
690 "compatibility for kern.fallback_elf_brand");