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_xxx.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  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)kern_xxx.c  8.2 (Berkeley) 11/14/93
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/11.1/sys/kern/kern_xxx.c 193066 2009-05-29 21:27:12Z jamie $");
   34 
   35 #include "opt_compat.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/sysproto.h>
   40 #include <sys/kernel.h>
   41 #include <sys/priv.h>
   42 #include <sys/proc.h>
   43 #include <sys/lock.h>
   44 #include <sys/mutex.h>
   45 #include <sys/socket.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/utsname.h>
   48 
   49 #include <vm/vm_param.h>
   50 
   51 #if defined(COMPAT_43)
   52 
   53 #ifndef _SYS_SYSPROTO_H_
   54 struct gethostname_args {
   55         char    *hostname;
   56         u_int   len;
   57 };
   58 #endif
   59 /* ARGSUSED */
   60 int
   61 ogethostname(td, uap)
   62         struct thread *td;
   63         struct gethostname_args *uap;
   64 {
   65         int name[2];
   66         size_t len = uap->len;
   67 
   68         name[0] = CTL_KERN;
   69         name[1] = KERN_HOSTNAME;
   70         return (userland_sysctl(td, name, 2, uap->hostname, &len,
   71             1, 0, 0, 0, 0));
   72 }
   73 
   74 #ifndef _SYS_SYSPROTO_H_
   75 struct sethostname_args {
   76         char    *hostname;
   77         u_int   len;
   78 };
   79 #endif
   80 /* ARGSUSED */
   81 int
   82 osethostname(td, uap)
   83         struct thread *td;
   84         register struct sethostname_args *uap;
   85 {
   86         int name[2];
   87 
   88         name[0] = CTL_KERN;
   89         name[1] = KERN_HOSTNAME;
   90         return (userland_sysctl(td, name, 2, 0, 0, 0, uap->hostname,
   91             uap->len, 0, 0));
   92 }
   93 
   94 #ifndef _SYS_SYSPROTO_H_
   95 struct ogethostid_args {
   96         int     dummy;
   97 };
   98 #endif
   99 /* ARGSUSED */
  100 int
  101 ogethostid(td, uap)
  102         struct thread *td;
  103         struct ogethostid_args *uap;
  104 {
  105         size_t len = sizeof(long);
  106         int name[2];
  107 
  108         name[0] = CTL_KERN;
  109         name[1] = KERN_HOSTID;
  110         return (kernel_sysctl(td, name, 2, (long *)td->td_retval, &len,
  111             NULL, 0, NULL, 0));
  112 }
  113 #endif /* COMPAT_43 */
  114 
  115 #ifdef COMPAT_43
  116 #ifndef _SYS_SYSPROTO_H_
  117 struct osethostid_args {
  118         long    hostid;
  119 };
  120 #endif
  121 /* ARGSUSED */
  122 int
  123 osethostid(td, uap)
  124         struct thread *td;
  125         struct osethostid_args *uap;
  126 {
  127         int name[2];
  128 
  129         name[0] = CTL_KERN;
  130         name[1] = KERN_HOSTID;
  131         return (kernel_sysctl(td, name, 2, NULL, NULL, &uap->hostid,
  132             sizeof(uap->hostid), NULL, 0));
  133 }
  134 
  135 int
  136 oquota(td, uap)
  137         struct thread *td;
  138         struct oquota_args *uap;
  139 {
  140 
  141         return (ENOSYS);
  142 }
  143 
  144 #define KINFO_PROC              (0<<8)
  145 #define KINFO_RT                (1<<8)
  146 #define KINFO_VNODE             (2<<8)
  147 #define KINFO_FILE              (3<<8)
  148 #define KINFO_METER             (4<<8)
  149 #define KINFO_LOADAVG           (5<<8)
  150 #define KINFO_CLOCKRATE         (6<<8)
  151 
  152 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
  153 #define KINFO_BSDI_SYSINFO      (101<<8)
  154 
  155 /*
  156  * XXX this is bloat, but I hope it's better here than on the potentially
  157  * limited kernel stack...  -Peter
  158  */
  159 
  160 static struct {
  161         int     bsdi_machine;           /* "i386" on BSD/386 */
  162 /*      ^^^ this is an offset to the string, relative to the struct start */
  163         char    *pad0;
  164         long    pad1;
  165         long    pad2;
  166         long    pad3;
  167         u_long  pad4;
  168         u_long  pad5;
  169         u_long  pad6;
  170 
  171         int     bsdi_ostype;            /* "BSD/386" on BSD/386 */
  172         int     bsdi_osrelease;         /* "1.1" on BSD/386 */
  173         long    pad7;
  174         long    pad8;
  175         char    *pad9;
  176 
  177         long    pad10;
  178         long    pad11;
  179         int     pad12;
  180         long    pad13;
  181         quad_t  pad14;
  182         long    pad15;
  183 
  184         struct  timeval pad16;
  185         /* we dont set this, because BSDI's uname used gethostname() instead */
  186         int     bsdi_hostname;          /* hostname on BSD/386 */
  187 
  188         /* the actual string data is appended here */
  189 
  190 } bsdi_si;
  191 
  192 /*
  193  * this data is appended to the end of the bsdi_si structure during copyout.
  194  * The "char *" offsets are relative to the base of the bsdi_si struct.
  195  * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
  196  * should not exceed the length of the buffer here... (or else!! :-)
  197  */
  198 static char bsdi_strings[80];   /* It had better be less than this! */
  199 
  200 #ifndef _SYS_SYSPROTO_H_
  201 struct getkerninfo_args {
  202         int     op;
  203         char    *where;
  204         size_t  *size;
  205         int     arg;
  206 };
  207 #endif
  208 int
  209 ogetkerninfo(struct thread *td, struct getkerninfo_args *uap)
  210 {
  211         int error, name[6];
  212         size_t size;
  213         u_int needed = 0;
  214 
  215         switch (uap->op & 0xff00) {
  216 
  217         case KINFO_RT:
  218                 name[0] = CTL_NET;
  219                 name[1] = PF_ROUTE;
  220                 name[2] = 0;
  221                 name[3] = (uap->op & 0xff0000) >> 16;
  222                 name[4] = uap->op & 0xff;
  223                 name[5] = uap->arg;
  224                 error = userland_sysctl(td, name, 6, uap->where, uap->size,
  225                         0, 0, 0, &size, 0);
  226                 break;
  227 
  228         case KINFO_VNODE:
  229                 name[0] = CTL_KERN;
  230                 name[1] = KERN_VNODE;
  231                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  232                         0, 0, 0, &size, 0);
  233                 break;
  234 
  235         case KINFO_PROC:
  236                 name[0] = CTL_KERN;
  237                 name[1] = KERN_PROC;
  238                 name[2] = uap->op & 0xff;
  239                 name[3] = uap->arg;
  240                 error = userland_sysctl(td, name, 4, uap->where, uap->size,
  241                         0, 0, 0, &size, 0);
  242                 break;
  243 
  244         case KINFO_FILE:
  245                 name[0] = CTL_KERN;
  246                 name[1] = KERN_FILE;
  247                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  248                         0, 0, 0, &size, 0);
  249                 break;
  250 
  251         case KINFO_METER:
  252                 name[0] = CTL_VM;
  253                 name[1] = VM_TOTAL;
  254                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  255                         0, 0, 0, &size, 0);
  256                 break;
  257 
  258         case KINFO_LOADAVG:
  259                 name[0] = CTL_VM;
  260                 name[1] = VM_LOADAVG;
  261                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  262                         0, 0, 0, &size, 0);
  263                 break;
  264 
  265         case KINFO_CLOCKRATE:
  266                 name[0] = CTL_KERN;
  267                 name[1] = KERN_CLOCKRATE;
  268                 error = userland_sysctl(td, name, 2, uap->where, uap->size,
  269                         0, 0, 0, &size, 0);
  270                 break;
  271 
  272         case KINFO_BSDI_SYSINFO: {
  273                 /*
  274                  * this is pretty crude, but it's just enough for uname()
  275                  * from BSDI's 1.x libc to work.
  276                  *
  277                  * *size gives the size of the buffer before the call, and
  278                  * the amount of data copied after a successful call.
  279                  * If successful, the return value is the amount of data
  280                  * available, which can be larger than *size.
  281                  *
  282                  * BSDI's 2.x product apparently fails with ENOMEM if *size
  283                  * is too small.
  284                  */
  285 
  286                 u_int left;
  287                 char *s;
  288 
  289                 bzero((char *)&bsdi_si, sizeof(bsdi_si));
  290                 bzero(bsdi_strings, sizeof(bsdi_strings));
  291 
  292                 s = bsdi_strings;
  293 
  294                 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
  295                 strcpy(s, ostype);
  296                 s += strlen(s) + 1;
  297 
  298                 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
  299                 strcpy(s, osrelease);
  300                 s += strlen(s) + 1;
  301 
  302                 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
  303                 strcpy(s, machine);
  304                 s += strlen(s) + 1;
  305 
  306                 needed = sizeof(bsdi_si) + (s - bsdi_strings);
  307 
  308                 if ((uap->where == NULL) || (uap->size == NULL)) {
  309                         /* process is asking how much buffer to supply.. */
  310                         size = needed;
  311                         error = 0;
  312                         break;
  313                 }
  314 
  315                 if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
  316                         break;
  317 
  318                 /* if too much buffer supplied, trim it down */
  319                 if (size > needed)
  320                         size = needed;
  321 
  322                 /* how much of the buffer is remaining */
  323                 left = size;
  324 
  325                 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
  326                         break;
  327 
  328                 /* is there any point in continuing? */
  329                 if (left > sizeof(bsdi_si)) {
  330                         left -= sizeof(bsdi_si);
  331                         error = copyout(&bsdi_strings,
  332                                         uap->where + sizeof(bsdi_si), left);
  333                 }
  334                 break;
  335         }
  336 
  337         default:
  338                 error = EOPNOTSUPP;
  339                 break;
  340         }
  341         if (error == 0) {
  342                 td->td_retval[0] = needed ? needed : size;
  343                 if (uap->size) {
  344                         error = copyout(&size, uap->size, sizeof(size));
  345                 }
  346         }
  347         return (error);
  348 }
  349 #endif /* COMPAT_43 */
  350 
  351 #ifdef COMPAT_FREEBSD4
  352 /*
  353  * This is the FreeBSD-1.1 compatible uname(2) interface.  These days it is
  354  * done in libc as a wrapper around a bunch of sysctl's.  This must maintain
  355  * the old 1.1 binary ABI.
  356  */
  357 #if SYS_NMLN != 32
  358 #error "FreeBSD-1.1 uname syscall has been broken"
  359 #endif
  360 #ifndef _SYS_SYSPROTO_H_
  361 struct uname_args {
  362         struct utsname  *name;
  363 };
  364 #endif
  365 /* ARGSUSED */
  366 int
  367 freebsd4_uname(struct thread *td, struct freebsd4_uname_args *uap)
  368 {
  369         int name[2], error;
  370         size_t len;
  371         char *s, *us;
  372 
  373         name[0] = CTL_KERN;
  374         name[1] = KERN_OSTYPE;
  375         len = sizeof (uap->name->sysname);
  376         error = userland_sysctl(td, name, 2, uap->name->sysname, &len, 
  377                 1, 0, 0, 0, 0);
  378         if (error)
  379                 return (error);
  380         subyte( uap->name->sysname + sizeof(uap->name->sysname) - 1, 0);
  381 
  382         name[1] = KERN_HOSTNAME;
  383         len = sizeof uap->name->nodename;
  384         error = userland_sysctl(td, name, 2, uap->name->nodename, &len, 
  385                 1, 0, 0, 0, 0);
  386         if (error)
  387                 return (error);
  388         subyte( uap->name->nodename + sizeof(uap->name->nodename) - 1, 0);
  389 
  390         name[1] = KERN_OSRELEASE;
  391         len = sizeof uap->name->release;
  392         error = userland_sysctl(td, name, 2, uap->name->release, &len, 
  393                 1, 0, 0, 0, 0);
  394         if (error)
  395                 return (error);
  396         subyte( uap->name->release + sizeof(uap->name->release) - 1, 0);
  397 
  398 /*
  399         name = KERN_VERSION;
  400         len = sizeof uap->name->version;
  401         error = userland_sysctl(td, name, 2, uap->name->version, &len, 
  402                 1, 0, 0, 0, 0);
  403         if (error)
  404                 return (error);
  405         subyte( uap->name->version + sizeof(uap->name->version) - 1, 0);
  406 */
  407 
  408 /*
  409  * this stupid hackery to make the version field look like FreeBSD 1.1
  410  */
  411         for(s = version; *s && *s != '#'; s++);
  412 
  413         for(us = uap->name->version; *s && *s != ':'; s++) {
  414                 error = subyte( us++, *s);
  415                 if (error)
  416                         return (error);
  417         }
  418         error = subyte( us++, 0);
  419         if (error)
  420                 return (error);
  421 
  422         name[0] = CTL_HW;
  423         name[1] = HW_MACHINE;
  424         len = sizeof uap->name->machine;
  425         error = userland_sysctl(td, name, 2, uap->name->machine, &len, 
  426                 1, 0, 0, 0, 0);
  427         if (error)
  428                 return (error);
  429         subyte( uap->name->machine + sizeof(uap->name->machine) - 1, 0);
  430         return (0);
  431 }
  432 
  433 #ifndef _SYS_SYSPROTO_H_
  434 struct getdomainname_args {
  435         char    *domainname;
  436         int     len;
  437 };
  438 #endif
  439 /* ARGSUSED */
  440 int
  441 freebsd4_getdomainname(struct thread *td,
  442     struct freebsd4_getdomainname_args *uap)
  443 {
  444         int name[2];
  445         size_t len = uap->len;
  446 
  447         name[0] = CTL_KERN;
  448         name[1] = KERN_NISDOMAINNAME;
  449         return (userland_sysctl(td, name, 2, uap->domainname, &len,
  450             1, 0, 0, 0, 0));
  451 }
  452 
  453 #ifndef _SYS_SYSPROTO_H_
  454 struct setdomainname_args {
  455         char    *domainname;
  456         int     len;
  457 };
  458 #endif
  459 /* ARGSUSED */
  460 int
  461 freebsd4_setdomainname(struct thread *td,
  462     struct freebsd4_setdomainname_args *uap)
  463 {
  464         int name[2];
  465 
  466         name[0] = CTL_KERN;
  467         name[1] = KERN_NISDOMAINNAME;
  468         return (userland_sysctl(td, name, 2, 0, 0, 0, uap->domainname,
  469             uap->len, 0, 0));
  470 }
  471 #endif /* COMPAT_FREEBSD4 */

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