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. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Berkeley and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      @(#)kern_sysctl.c       8.4 (Berkeley) 4/14/94
   40  * $FreeBSD$
   41  */
   42 
   43 #include <sys/param.h>
   44 #include <sys/kernel.h>
   45 #include <sys/systm.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/proc.h>
   48 #include <sys/jail.h>
   49 #include <machine/smp.h>
   50 
   51 SYSCTL_NODE(, 0,          sysctl, CTLFLAG_RW, 0,
   52         "Sysctl internal magic");
   53 SYSCTL_NODE(, CTL_KERN,   kern,   CTLFLAG_RW, 0,
   54         "High kernel, proc, limits &c");
   55 SYSCTL_NODE(, CTL_VM,     vm,     CTLFLAG_RW, 0,
   56         "Virtual memory");
   57 SYSCTL_NODE(, CTL_VFS,    vfs,     CTLFLAG_RW, 0,
   58         "File system");
   59 SYSCTL_NODE(, CTL_NET,    net,    CTLFLAG_RW, 0,
   60         "Network, (see socket.h)");
   61 SYSCTL_NODE(, CTL_DEBUG,  debug,  CTLFLAG_RW, 0,
   62         "Debugging");
   63 SYSCTL_NODE(_debug, OID_AUTO,  sizeof,  CTLFLAG_RW, 0,
   64         "Sizeof various things");
   65 SYSCTL_NODE(, CTL_HW,     hw,     CTLFLAG_RW, 0,
   66         "hardware");
   67 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
   68         "machine dependent");
   69 SYSCTL_NODE(, CTL_USER,   user,   CTLFLAG_RW, 0,
   70         "user-level");
   71 SYSCTL_NODE(, CTL_P1003_1B,  p1003_1b,   CTLFLAG_RW, 0,
   72         "p1003_1b, (see p1003_1b.h)");
   73 
   74 SYSCTL_NODE(, OID_AUTO,  compat, CTLFLAG_RW, 0,
   75         "Compatibility code");
   76 
   77 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, 
   78     osrelease, 0, "Operating system type");
   79 
   80 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 
   81     0, BSD, "Operating system revision");
   82 
   83 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, 
   84     version, 0, "Kernel version");
   85 
   86 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, 
   87     ostype, 0, "Operating system type");
   88 
   89 extern int osreldate;
   90 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 
   91     &osreldate, 0, "Operating system release date");
   92 
   93 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, 
   94     &maxproc, 0, "Maximum number of processes");
   95 
   96 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 
   97     &maxprocperuid, 0, "Maximum processes allowed per userid");
   98 
   99 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD, 
  100     &maxusers, 0, "Hint for kernel tuning");
  101 
  102 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 
  103     0, ARG_MAX, "Maximum bytes of argument to execve(2)");
  104 
  105 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 
  106     0, _KPOSIX_VERSION, "Version of POSIX attempting to comply to");
  107 
  108 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 
  109     0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
  110 
  111 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 
  112     0, 1, "Whether job control is available");
  113 
  114 #ifdef _POSIX_SAVED_IDS
  115 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 
  116     0, 1, "Whether saved set-group/user ID is available");
  117 #else
  118 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 
  119     0, 0, "Whether saved set-group/user ID is available");
  120 #endif
  121 
  122 char kernelname[MAXPATHLEN] = "/kernel";        /* XXX bloat */
  123 
  124 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 
  125     kernelname, sizeof kernelname, "Name of kernel file booted");
  126 
  127 #ifdef SMP
  128 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 
  129     &mp_ncpus, 0, "Number of active CPUs");
  130 #else
  131 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 
  132     0, 1, "Number of active CPUs");
  133 #endif
  134 
  135 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 
  136     0, BYTE_ORDER, "System byte order");
  137 
  138 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 
  139     0, PAGE_SIZE, "System memory page size");
  140 
  141 static char     machine_arch[] = MACHINE_ARCH;
  142 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
  143     machine_arch, 0, "System architecture");
  144 
  145 char hostname[MAXHOSTNAMELEN];
  146 
  147 static int
  148 sysctl_hostname(SYSCTL_HANDLER_ARGS)
  149 {
  150         int error;
  151 
  152         if (req->p->p_prison) {
  153                 if (!jail_set_hostname_allowed && req->newptr)
  154                         return(EPERM);
  155                 error = sysctl_handle_string(oidp, 
  156                     req->p->p_prison->pr_host,
  157                     sizeof req->p->p_prison->pr_host, req);
  158         } else
  159                 error = sysctl_handle_string(oidp, 
  160                     hostname, sizeof hostname, req);
  161         return (error);
  162 }
  163 
  164 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 
  165        CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
  166        0, 0, sysctl_hostname, "A", "Hostname");
  167 
  168 int securelevel = -1;
  169 
  170 static int
  171 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
  172 {
  173                 int error, level;
  174 
  175                 level = securelevel;
  176                 error = sysctl_handle_int(oidp, &level, 0, req);
  177                 if (error || !req->newptr)
  178                         return (error);
  179                 if (level < securelevel)
  180                         return (EPERM);
  181                 securelevel = level;
  182                 return (error);
  183 }
  184 
  185 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW,
  186     0, 0, sysctl_kern_securelvl, "I", "Current secure level");
  187 
  188 char domainname[MAXHOSTNAMELEN];
  189 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
  190     &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
  191 
  192 unsigned long hostid;
  193 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
  194 
  195 /*
  196  * This is really cheating.  These actually live in the libc, something
  197  * which I'm not quite sure is a good idea anyway, but in order for 
  198  * getnext and friends to actually work, we define dummies here.
  199  */
  200 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 
  201     "", 0, "PATH that finds all the standard utilities");
  202 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 
  203     0, 0, "Max ibase/obase values in bc(1)");
  204 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 
  205     0, 0, "Max array size in bc(1)");
  206 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 
  207     0, 0, "Max scale value in bc(1)");
  208 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 
  209     0, 0, "Max string length in bc(1)");
  210 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 
  211     0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
  212 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
  213 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 
  214     0, 0, "Max length (bytes) of a text-processing utility's input line");
  215 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 
  216     0, 0, "Maximum number of repeats of a regexp permitted");
  217 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 
  218     0, 0, 
  219     "The version of POSIX 1003.2 with which the system attempts to comply");
  220 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 
  221     0, 0, "Whether C development supports the C bindings option");
  222 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 
  223     0, 0, "Whether system supports the C development utilities option");
  224 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 
  225     0, 0, "");
  226 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 
  227     0, 0, "Whether system supports FORTRAN development utilities");
  228 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 
  229     0, 0, "Whether system supports FORTRAN runtime utilities");
  230 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 
  231     0, 0, "Whether system supports creation of locales");
  232 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 
  233     0, 0, "Whether system supports software development utilities");
  234 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 
  235     0, 0, "Whether system supports the user portability utilities");
  236 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 
  237     0, 0, "Min Maximum number of streams a process may have open at one time");
  238 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 
  239     0, 0, "Min Maximum number of types supported for timezone names");
  240 
  241 #include <sys/vnode.h>
  242 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 
  243     0, sizeof(struct vnode), "sizeof(struct vnode)");
  244 
  245 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 
  246     0, sizeof(struct proc), "sizeof(struct proc)");
  247 
  248 #include <sys/conf.h>
  249 SYSCTL_INT(_debug_sizeof, OID_AUTO, specinfo, CTLFLAG_RD,
  250     0, sizeof(struct specinfo), "sizeof(struct specinfo)");

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