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: stable/10/sys/kern/kern_mib.c 294283 2016-01-18 18:27:21Z jhb $");
   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_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD|CTLFLAG_CAPRD,
   94     SYSCTL_NULL_INT_PTR, BSD, "Operating system revision");
   95 
   96 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE,
   97     version, 0, "Kernel version");
   98 
   99 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE,
  100     compiler_version, 0, "Version of compiler used to compile kernel");
  101 
  102 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE|
  103     CTLFLAG_CAPRD, ostype, 0, "Operating system type");
  104 
  105 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
  106     &maxproc, 0, "Maximum number of processes");
  107 
  108 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
  109     &maxprocperuid, 0, "Maximum processes allowed per userid");
  110 
  111 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
  112     &maxusers, 0, "Hint for kernel tuning");
  113 
  114 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD|CTLFLAG_CAPRD,
  115     SYSCTL_NULL_INT_PTR, ARG_MAX, "Maximum bytes of argument to execve(2)");
  116 
  117 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD|CTLFLAG_CAPRD,
  118     SYSCTL_NULL_INT_PTR, _POSIX_VERSION, "Version of POSIX attempting to comply to");
  119 
  120 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN|CTLFLAG_CAPRD,
  121     &ngroups_max, 0,
  122     "Maximum number of supplemental groups a user can belong to");
  123 
  124 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD|CTLFLAG_CAPRD,
  125     SYSCTL_NULL_INT_PTR, 1, "Whether job control is available");
  126 
  127 #ifdef _POSIX_SAVED_IDS
  128 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
  129     SYSCTL_NULL_INT_PTR, 1, "Whether saved set-group/user ID is available");
  130 #else
  131 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD|CTLFLAG_CAPRD,
  132     SYSCTL_NULL_INT_PTR, 0, "Whether saved set-group/user ID is available");
  133 #endif
  134 
  135 char kernelname[MAXPATHLEN] = "/kernel";        /* XXX bloat */
  136 
  137 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
  138     kernelname, sizeof kernelname, "Name of kernel file booted");
  139 
  140 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD|CTLFLAG_CAPRD,
  141     &mp_ncpus, 0, "Number of active CPUs");
  142 
  143 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD|CTLFLAG_CAPRD,
  144     SYSCTL_NULL_INT_PTR, BYTE_ORDER, "System byte order");
  145 
  146 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD|CTLFLAG_CAPRD,
  147     SYSCTL_NULL_INT_PTR, PAGE_SIZE, "System memory page size");
  148 
  149 static int
  150 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
  151 {
  152         char buf[256];
  153         size_t len;
  154 
  155         len = req->oldlen;
  156         if (len > sizeof(buf))
  157                 len = sizeof(buf);
  158         arc4rand(buf, len, 0);
  159         return (SYSCTL_OUT(req, buf, len));
  160 }
  161 
  162 SYSCTL_PROC(_kern, KERN_ARND, arandom,
  163     CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE | CTLFLAG_CAPRD, NULL, 0,
  164     sysctl_kern_arnd, "", "arc4rand");
  165 
  166 static int
  167 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
  168 {
  169         u_long val;
  170 
  171         val = ctob(physmem);
  172         return (sysctl_handle_long(oidp, &val, 0, req));
  173 }
  174 
  175 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
  176         0, 0, sysctl_hw_physmem, "LU", "");
  177 
  178 static int
  179 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
  180 {
  181         u_long val;
  182         val = ctob(realmem);
  183         return (sysctl_handle_long(oidp, &val, 0, req));
  184 }
  185 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
  186         0, 0, sysctl_hw_realmem, "LU", "");
  187 static int
  188 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
  189 {
  190         u_long val;
  191 
  192         val = ctob(physmem - cnt.v_wire_count);
  193         return (sysctl_handle_long(oidp, &val, 0, req));
  194 }
  195 
  196 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
  197         0, 0, sysctl_hw_usermem, "LU", "");
  198 
  199 SYSCTL_LONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
  200 
  201 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE };
  202 
  203 static int
  204 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)
  205 {
  206         int error;
  207 #ifdef SCTL_MASK32
  208         int i;
  209         uint32_t pagesizes32[MAXPAGESIZES];
  210 
  211         if (req->flags & SCTL_MASK32) {
  212                 /*
  213                  * Recreate the "pagesizes" array with 32-bit elements.  Truncate
  214                  * any page size greater than UINT32_MAX to zero.
  215                  */
  216                 for (i = 0; i < MAXPAGESIZES; i++)
  217                         pagesizes32[i] = (uint32_t)pagesizes[i];
  218 
  219                 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32));
  220         } else
  221 #endif
  222                 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes));
  223         return (error);
  224 }
  225 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD,
  226     NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes");
  227 
  228 #ifdef SCTL_MASK32
  229 int adaptive_machine_arch = 1;
  230 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW,
  231     &adaptive_machine_arch, 1,
  232     "Adapt reported machine architecture to the ABI of the binary");
  233 #endif
  234 
  235 static int
  236 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)
  237 {
  238         int error;
  239         static const char machine_arch[] = MACHINE_ARCH;
  240 #ifdef SCTL_MASK32
  241         static const char machine_arch32[] = MACHINE_ARCH32;
  242 
  243         if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch)
  244                 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32));
  245         else
  246 #endif
  247                 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch));
  248         return (error);
  249 
  250 }
  251 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD,
  252     NULL, 0, sysctl_hw_machine_arch, "A", "System architecture");
  253 
  254 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE,
  255 #ifdef COMPAT_FREEBSD32
  256     MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries");
  257 #else
  258     MACHINE_ARCH, 0, "Supported architectures for binaries");
  259 #endif
  260 
  261 static int
  262 sysctl_hostname(SYSCTL_HANDLER_ARGS)
  263 {
  264         struct prison *pr, *cpr;
  265         size_t pr_offset;
  266         char tmpname[MAXHOSTNAMELEN];
  267         int descend, error, len;
  268 
  269         /*
  270          * This function can set: hostname domainname hostuuid.
  271          * Keep that in mind when comments say "hostname".
  272          */
  273         pr_offset = (size_t)arg1;
  274         len = arg2;
  275         KASSERT(len <= sizeof(tmpname),
  276             ("length %d too long for %s", len, __func__));
  277 
  278         pr = req->td->td_ucred->cr_prison;
  279         if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
  280                 return (EPERM);
  281         /*
  282          * Make a local copy of hostname to get/set so we don't have to hold
  283          * the jail mutex during the sysctl copyin/copyout activities.
  284          */
  285         mtx_lock(&pr->pr_mtx);
  286         bcopy((char *)pr + pr_offset, tmpname, len);
  287         mtx_unlock(&pr->pr_mtx);
  288 
  289         error = sysctl_handle_string(oidp, tmpname, len, req);
  290 
  291         if (req->newptr != NULL && error == 0) {
  292                 /*
  293                  * Copy the locally set hostname to all jails that share
  294                  * this host info.
  295                  */
  296                 sx_slock(&allprison_lock);
  297                 while (!(pr->pr_flags & PR_HOST))
  298                         pr = pr->pr_parent;
  299                 mtx_lock(&pr->pr_mtx);
  300                 bcopy(tmpname, (char *)pr + pr_offset, len);
  301                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
  302                         if (cpr->pr_flags & PR_HOST)
  303                                 descend = 0;
  304                         else
  305                                 bcopy(tmpname, (char *)cpr + pr_offset, len);
  306                 mtx_unlock(&pr->pr_mtx);
  307                 sx_sunlock(&allprison_lock);
  308         }
  309         return (error);
  310 }
  311 
  312 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
  313     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
  314     (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
  315     sysctl_hostname, "A", "Hostname");
  316 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
  317     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
  318     (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
  319     sysctl_hostname, "A", "Name of the current YP/NIS domain");
  320 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
  321     CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
  322     (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
  323     sysctl_hostname, "A", "Host UUID");
  324 
  325 static int      regression_securelevel_nonmonotonic = 0;
  326 
  327 #ifdef REGRESSION
  328 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
  329     &regression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
  330 #endif
  331 
  332 static int
  333 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
  334 {
  335         struct prison *pr, *cpr;
  336         int descend, error, level;
  337 
  338         pr = req->td->td_ucred->cr_prison;
  339 
  340         /*
  341          * Reading the securelevel is easy, since the current jail's level
  342          * is known to be at least as secure as any higher levels.  Perform
  343          * a lockless read since the securelevel is an integer.
  344          */
  345         level = pr->pr_securelevel;
  346         error = sysctl_handle_int(oidp, &level, 0, req);
  347         if (error || !req->newptr)
  348                 return (error);
  349         /* Permit update only if the new securelevel exceeds the old. */
  350         sx_slock(&allprison_lock);
  351         mtx_lock(&pr->pr_mtx);
  352         if (!regression_securelevel_nonmonotonic &&
  353             level < pr->pr_securelevel) {
  354                 mtx_unlock(&pr->pr_mtx);
  355                 sx_sunlock(&allprison_lock);
  356                 return (EPERM);
  357         }
  358         pr->pr_securelevel = level;
  359         /*
  360          * Set all child jails to be at least this level, but do not lower
  361          * them (even if regression_securelevel_nonmonotonic).
  362          */
  363         FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
  364                 if (cpr->pr_securelevel < level)
  365                         cpr->pr_securelevel = level;
  366         }
  367         mtx_unlock(&pr->pr_mtx);
  368         sx_sunlock(&allprison_lock);
  369         return (error);
  370 }
  371 
  372 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
  373     CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
  374     "I", "Current secure level");
  375 
  376 #ifdef INCLUDE_CONFIG_FILE
  377 /* Actual kernel configuration options. */
  378 extern char kernconfstring[];
  379 
  380 SYSCTL_STRING(_kern, OID_AUTO, conftxt, CTLFLAG_RD, kernconfstring, 0,
  381     "Kernel configuration file");
  382 #endif
  383 
  384 static int
  385 sysctl_hostid(SYSCTL_HANDLER_ARGS)
  386 {
  387         struct prison *pr, *cpr;
  388         u_long tmpid;
  389         int descend, error;
  390 
  391         /*
  392          * Like sysctl_hostname, except it operates on a u_long
  393          * instead of a string, and is used only for hostid.
  394          */
  395         pr = req->td->td_ucred->cr_prison;
  396         if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
  397                 return (EPERM);
  398         tmpid = pr->pr_hostid;
  399         error = sysctl_handle_long(oidp, &tmpid, 0, req);
  400 
  401         if (req->newptr != NULL && error == 0) {
  402                 sx_slock(&allprison_lock);
  403                 while (!(pr->pr_flags & PR_HOST))
  404                         pr = pr->pr_parent;
  405                 mtx_lock(&pr->pr_mtx);
  406                 pr->pr_hostid = tmpid;
  407                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
  408                         if (cpr->pr_flags & PR_HOST)
  409                                 descend = 0;
  410                         else
  411                                 cpr->pr_hostid = tmpid;
  412                 mtx_unlock(&pr->pr_mtx);
  413                 sx_sunlock(&allprison_lock);
  414         }
  415         return (error);
  416 }
  417 
  418 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
  419     CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
  420     NULL, 0, sysctl_hostid, "LU", "Host ID");
  421 
  422 /*
  423  * The osrelease string is copied from the global (osrelease in vers.c) into
  424  * prison0 by a sysinit and is inherited by child jails if not changed at jail
  425  * creation, so we always return the copy from the current prison data.
  426  */
  427 static int
  428 sysctl_osrelease(SYSCTL_HANDLER_ARGS)
  429 {
  430         struct prison *pr;
  431 
  432         pr = req->td->td_ucred->cr_prison;
  433         return (SYSCTL_OUT(req, pr->pr_osrelease, strlen(pr->pr_osrelease) + 1));
  434 
  435 }
  436 
  437 SYSCTL_PROC(_kern, KERN_OSRELEASE, osrelease,
  438     CTLTYPE_STRING | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
  439     NULL, 0, sysctl_osrelease, "A", "Operating system release");
  440 
  441 /*
  442  * The osreldate number is copied from the global (osreldate in vers.c) into
  443  * prison0 by a sysinit and is inherited by child jails if not changed at jail
  444  * creation, so we always return the value from the current prison data.
  445  */
  446 static int
  447 sysctl_osreldate(SYSCTL_HANDLER_ARGS)
  448 {
  449         struct prison *pr;
  450 
  451         pr = req->td->td_ucred->cr_prison;
  452         return (SYSCTL_OUT(req, &pr->pr_osreldate, sizeof(pr->pr_osreldate)));
  453 
  454 }
  455 
  456 /*
  457  * NOTICE: The *userland* release date is available in
  458  * /usr/include/osreldate.h
  459  */
  460 SYSCTL_PROC(_kern, KERN_OSRELDATE, osreldate,
  461     CTLTYPE_INT | CTLFLAG_CAPRD | CTLFLAG_RD | CTLFLAG_MPSAFE,
  462     NULL, 0, sysctl_osreldate, "I", "Kernel release date");
  463 
  464 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
  465 
  466 #ifdef COMPAT_FREEBSD4
  467 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
  468 #endif
  469 
  470 #ifdef COMPAT_FREEBSD5
  471 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
  472 #endif
  473 
  474 #ifdef COMPAT_FREEBSD6
  475 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
  476 #endif
  477 
  478 #ifdef COMPAT_FREEBSD7
  479 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
  480 #endif
  481 
  482 /*
  483  * This is really cheating.  These actually live in the libc, something
  484  * which I'm not quite sure is a good idea anyway, but in order for
  485  * getnext and friends to actually work, we define dummies here.
  486  *
  487  * XXXRW: These probably should be CTLFLAG_CAPRD.
  488  */
  489 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
  490     "", 0, "PATH that finds all the standard utilities");
  491 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
  492     SYSCTL_NULL_INT_PTR, 0, "Max ibase/obase values in bc(1)");
  493 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
  494     SYSCTL_NULL_INT_PTR, 0, "Max array size in bc(1)");
  495 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
  496     SYSCTL_NULL_INT_PTR, 0, "Max scale value in bc(1)");
  497 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
  498     SYSCTL_NULL_INT_PTR, 0, "Max string length in bc(1)");
  499 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
  500     SYSCTL_NULL_INT_PTR, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
  501 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD,
  502     SYSCTL_NULL_INT_PTR, 0, "");
  503 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
  504     SYSCTL_NULL_INT_PTR, 0, "Max length (bytes) of a text-processing utility's input line");
  505 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
  506     SYSCTL_NULL_INT_PTR, 0, "Maximum number of repeats of a regexp permitted");
  507 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
  508     SYSCTL_NULL_INT_PTR, 0,
  509     "The version of POSIX 1003.2 with which the system attempts to comply");
  510 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
  511     SYSCTL_NULL_INT_PTR, 0, "Whether C development supports the C bindings option");
  512 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
  513     SYSCTL_NULL_INT_PTR, 0, "Whether system supports the C development utilities option");
  514 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
  515     SYSCTL_NULL_INT_PTR, 0, "");
  516 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
  517     SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN development utilities");
  518 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
  519     SYSCTL_NULL_INT_PTR, 0, "Whether system supports FORTRAN runtime utilities");
  520 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
  521     SYSCTL_NULL_INT_PTR, 0, "Whether system supports creation of locales");
  522 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
  523     SYSCTL_NULL_INT_PTR, 0, "Whether system supports software development utilities");
  524 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
  525     SYSCTL_NULL_INT_PTR, 0, "Whether system supports the user portability utilities");
  526 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
  527     SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of streams a process may have open at one time");
  528 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
  529     SYSCTL_NULL_INT_PTR, 0, "Min Maximum number of types supported for timezone names");
  530 
  531 #include <sys/vnode.h>
  532 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
  533     SYSCTL_NULL_INT_PTR, sizeof(struct vnode), "sizeof(struct vnode)");
  534 
  535 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
  536     SYSCTL_NULL_INT_PTR, sizeof(struct proc), "sizeof(struct proc)");
  537 
  538 static int
  539 sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS)
  540 {
  541         int error, pm;
  542 
  543         pm = pid_max;
  544         error = sysctl_handle_int(oidp, &pm, 0, req);
  545         if (error || !req->newptr)
  546                 return (error);
  547         sx_xlock(&proctree_lock);
  548         sx_xlock(&allproc_lock);
  549 
  550         /*
  551          * Only permit the values less then PID_MAX.
  552          * As a safety measure, do not allow to limit the pid_max too much.
  553          */
  554         if (pm < 300 || pm > PID_MAX)
  555                 error = EINVAL;
  556         else
  557                 pid_max = pm;
  558         sx_xunlock(&allproc_lock);
  559         sx_xunlock(&proctree_lock);
  560         return (error);
  561 }
  562 SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_TUN |
  563     CTLFLAG_MPSAFE, 0, 0, sysctl_kern_pid_max, "I",
  564     "Maximum allowed pid");
  565 
  566 #include <sys/bio.h>
  567 #include <sys/buf.h>
  568 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
  569     SYSCTL_NULL_INT_PTR, sizeof(struct bio), "sizeof(struct bio)");
  570 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
  571     SYSCTL_NULL_INT_PTR, sizeof(struct buf), "sizeof(struct buf)");
  572 
  573 #include <sys/user.h>
  574 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
  575     SYSCTL_NULL_INT_PTR, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
  576 
  577 /* Used by kernel debuggers. */
  578 const int pcb_size = sizeof(struct pcb);
  579 SYSCTL_INT(_debug_sizeof, OID_AUTO, pcb, CTLFLAG_RD,
  580     SYSCTL_NULL_INT_PTR, sizeof(struct pcb), "sizeof(struct pcb)");
  581 
  582 /* XXX compatibility, remove for 6.0 */
  583 #include <sys/imgact.h>
  584 #include <sys/imgact_elf.h>
  585 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
  586     &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
  587     "compatibility for kern.fallback_elf_brand");

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