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  * 3. 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  * $FreeBSD: src/sys/kern/kern_mib.c,v 1.29.2.4 2001/07/30 23:28:00 peter Exp $
   37  */
   38 
   39 #include <sys/param.h>
   40 #include <sys/kernel.h>
   41 #include <sys/systm.h>
   42 #include <sys/sysctl.h>
   43 #include <sys/proc.h>
   44 #include <sys/lockf.h>
   45 #include <sys/jail.h>
   46 #include <machine/smp.h>
   47 
   48 SYSCTL_NODE(, 0,          sysctl, CTLFLAG_RW, 0,
   49         "Sysctl internal magic");
   50 SYSCTL_NODE(, CTL_KERN,   kern,   CTLFLAG_RW, 0,
   51         "High kernel, proc, limits &c");
   52 SYSCTL_NODE(, CTL_VM,     vm,     CTLFLAG_RW, 0,
   53         "Virtual memory");
   54 SYSCTL_NODE(, CTL_VFS,    vfs,     CTLFLAG_RW, 0,
   55         "File system");
   56 SYSCTL_NODE(, CTL_NET,    net,    CTLFLAG_RW, 0,
   57         "Network, (see socket.h)");
   58 SYSCTL_NODE(, CTL_DEBUG,  debug,  CTLFLAG_RW, 0,
   59         "Debugging");
   60 SYSCTL_NODE(_debug, OID_AUTO,  sizeof,  CTLFLAG_RW, 0,
   61         "Size of various kernel data structures");
   62 SYSCTL_NODE(, CTL_HW,     hw,     CTLFLAG_RW, 0,
   63         "hardware");
   64 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
   65         "machine dependent");
   66 SYSCTL_NODE(, CTL_USER,   user,   CTLFLAG_RW, 0,
   67         "user-level");
   68 SYSCTL_NODE(, CTL_P1003_1B,  p1003_1b,   CTLFLAG_RW, 0,
   69         "p1003_1b, (see p1003_1b.h)");
   70 SYSCTL_NODE(, CTL_LWKT,  lwkt,   CTLFLAG_RW, 0,
   71         "light weight kernel threads");
   72 
   73 SYSCTL_NODE(, OID_AUTO,  compat, CTLFLAG_RW, 0,
   74         "Compatibility code");
   75 SYSCTL_NODE(, OID_AUTO,  security,   CTLFLAG_RW, 0,
   76         "Security");
   77 
   78 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
   79     kern_ident, 0, "Kernel identifier");
   80 
   81 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, 
   82     osrelease, 0, "Operating system type");
   83 
   84 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 
   85     0, BSD, "Operating system revision");
   86 
   87 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, 
   88     version, 0, "Kernel version");
   89 
   90 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, 
   91     ostype, 0, "Operating system type");
   92 
   93 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 
   94     &osreldate, 0, "Operating system release date");
   95 
   96 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, 
   97     &maxproc, 0, "Maximum number of processes");
   98 
   99 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 
  100     &maxprocperuid, 0, "Maximum processes allowed per userid");
  101 
  102 SYSCTL_INT(_kern, KERN_MAXPOSIXLOCKSPERUID, maxposixlocksperuid, CTLFLAG_RW,
  103     &maxposixlocksperuid, 0, "Maximum number of POSIX-type locks per user id");
  104 
  105 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD, 
  106     &maxusers, 0, "Hint for kernel tuning");
  107 
  108 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 
  109     0, ARG_MAX, "Maximum bytes of argument to execve(2)");
  110 
  111 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 
  112     0, _KPOSIX_VERSION, "Version of POSIX attempting to comply to");
  113 
  114 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 
  115     0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
  116 
  117 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 
  118     0, 1, "Whether job control is available");
  119 
  120 #ifdef _POSIX_SAVED_IDS
  121 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 
  122     0, 1, "Whether saved set-group/user ID is available");
  123 #else
  124 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 
  125     0, 0, "Whether saved set-group/user ID is available");
  126 #endif
  127 
  128 char kernelname[MAXPATHLEN] = "/kernel";        /* XXX bloat */
  129 
  130 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 
  131     kernelname, sizeof kernelname, "Name of kernel file booted");
  132 
  133 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 
  134     &ncpus, 0, "Number of active CPUs");
  135 
  136 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 
  137     0, BYTE_ORDER, "System byte order");
  138 
  139 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 
  140     0, PAGE_SIZE, "System memory page size");
  141 
  142 static char     platform[] = MACHINE_PLATFORM;
  143 SYSCTL_STRING(_hw, HW_MACHINE_PLATFORM, platform, CTLFLAG_RD,
  144     platform, 0, "Platform architecture");
  145 
  146 static char     machine_arch[] = MACHINE_ARCH;
  147 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
  148     machine_arch, 0, "Cpu architecture");
  149 
  150 char hostname[MAXHOSTNAMELEN];
  151 
  152 static int
  153 sysctl_hostname(SYSCTL_HANDLER_ARGS)
  154 {
  155         struct thread *td = req->td;
  156         struct proc *p = td ? td->td_proc : NULL;
  157         int error;
  158 
  159         if (p && p->p_ucred->cr_prison) {
  160                 if (!jail_set_hostname_allowed && req->newptr)
  161                         return(EPERM);
  162                 error = sysctl_handle_string(oidp, 
  163                     p->p_ucred->cr_prison->pr_host,
  164                     sizeof p->p_ucred->cr_prison->pr_host, req);
  165         } else {
  166                 error = sysctl_handle_string(oidp, 
  167                     hostname, sizeof hostname, req);
  168         }
  169         return (error);
  170 }
  171 
  172 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 
  173        CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
  174        0, 0, sysctl_hostname, "A", "Hostname");
  175 
  176 int securelevel = -1;
  177 int kernel_mem_readonly = 0;
  178 
  179 static int
  180 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
  181 {
  182                 int error, level;
  183 
  184                 level = securelevel;
  185                 error = sysctl_handle_int(oidp, &level, 0, req);
  186                 if (error || !req->newptr)
  187                         return (error);
  188                 if (level < securelevel)
  189                         return (EPERM);
  190                 securelevel = level;
  191                 return (error);
  192 }
  193 
  194 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW,
  195     0, 0, sysctl_kern_securelvl, "I", "Current secure level");
  196 
  197 char domainname[MAXHOSTNAMELEN];
  198 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
  199     &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
  200 
  201 unsigned long hostid;
  202 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
  203 
  204 /*
  205  * This is really cheating.  These actually live in the libc, something
  206  * which I'm not quite sure is a good idea anyway, but in order for 
  207  * getnext and friends to actually work, we define dummies here.
  208  */
  209 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 
  210     "", 0, "PATH that finds all the standard utilities");
  211 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 
  212     0, 0, "Max ibase/obase values in bc(1)");
  213 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 
  214     0, 0, "Max array size in bc(1)");
  215 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 
  216     0, 0, "Max scale value in bc(1)");
  217 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 
  218     0, 0, "Max string length in bc(1)");
  219 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 
  220     0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
  221 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
  222 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 
  223     0, 0, "Max length (bytes) of a text-processing utility's input line");
  224 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 
  225     0, 0, "Maximum number of repeats of a regexp permitted");
  226 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 
  227     0, 0, 
  228     "The version of POSIX 1003.2 with which the system attempts to comply");
  229 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 
  230     0, 0, "Whether C development supports the C bindings option");
  231 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 
  232     0, 0, "Whether system supports the C development utilities option");
  233 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 
  234     0, 0, "");
  235 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 
  236     0, 0, "Whether system supports FORTRAN development utilities");
  237 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 
  238     0, 0, "Whether system supports FORTRAN runtime utilities");
  239 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 
  240     0, 0, "Whether system supports creation of locales");
  241 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 
  242     0, 0, "Whether system supports software development utilities");
  243 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 
  244     0, 0, "Whether system supports the user portability utilities");
  245 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 
  246     0, 0, "Min Maximum number of streams a process may have open at one time");
  247 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 
  248     0, 0, "Min Maximum number of types supported for timezone names");
  249 
  250 #include <sys/vnode.h>
  251 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 
  252     0, sizeof(struct vnode), "sizeof(struct vnode)");
  253 
  254 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 
  255     0, sizeof(struct proc), "sizeof(struct proc)");
  256 
  257 #include <sys/conf.h>
  258 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
  259     0, sizeof(struct cdev), "sizeof(struct cdev)");

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