The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_mib.c

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    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: releng/10.1/sys/kern/kern_mib.c 269446 2014-08-02 20:58:46Z hselasky $");
   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,
  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 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 | CTLFLAG_RW | CTLFLAG_TUN |
  530     CTLFLAG_MPSAFE, 0, 0, sysctl_kern_pid_max, "I",
  531     "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");

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