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/emulation/linux/linux_sysctl.c

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    1 /*-
    2  * Copyright (c) 2001 Marcel Moolenaar
    3  * 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  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: src/sys/compat/linux/linux_sysctl.c,v 1.2.2.1 2001/10/21 03:57:35 marcel Exp $
   29  * $DragonFly: src/sys/emulation/linux/linux_sysctl.c,v 1.9 2006/12/23 00:27:02 swildner Exp $
   30  */
   31 
   32 #include "opt_compat.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/proc.h>
   37 #include <sys/sysproto.h>
   38 
   39 #include <sys/mplock2.h>
   40 
   41 #include <arch_linux/linux.h>
   42 #include <arch_linux/linux_proto.h>
   43 #include "linux_util.h"
   44 
   45 #define LINUX_CTL_KERN          1
   46 #define LINUX_CTL_VM            2
   47 #define LINUX_CTL_NET           3
   48 #define LINUX_CTL_PROC          4
   49 #define LINUX_CTL_FS            5
   50 #define LINUX_CTL_DEBUG         6
   51 #define LINUX_CTL_DEV           7
   52 #define LINUX_CTL_BUS           8
   53 
   54 /* CTL_KERN names */
   55 #define LINUX_KERN_OSTYPE       1
   56 #define LINUX_KERN_OSRELEASE    2
   57 #define LINUX_KERN_OSREV        3
   58 #define LINUX_KERN_VERSION      4
   59 
   60 static int
   61 handle_string(struct l___sysctl_args *la, char *value)
   62 {
   63         int error;
   64 
   65         if (la->oldval != NULL) {
   66                 l_int len = strlen(value);
   67                 error = copyout(value, la->oldval, len + 1);
   68                 if (!error && la->oldlenp != NULL)
   69                         error = copyout(&len, la->oldlenp, sizeof(len));
   70                 if (error)
   71                         return (error);
   72         }
   73 
   74         if (la->newval != NULL)
   75                 return (ENOTDIR);
   76 
   77         return (0);
   78 }
   79 
   80 /*
   81  * MPALMOSTSAFE
   82  */
   83 int
   84 sys_linux_sysctl(struct linux_sysctl_args *args)
   85 {
   86         struct l___sysctl_args la;
   87         l_int *mib;
   88         int error, i;
   89 
   90         error = copyin((caddr_t)args->args, &la, sizeof(la));
   91         if (error)
   92                 return (error);
   93 
   94         if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME)
   95                 return (ENOTDIR);
   96 
   97         mib = kmalloc(la.nlen * sizeof(l_int), M_TEMP, M_WAITOK);
   98         error = copyin(la.name, mib, la.nlen * sizeof(l_int));
   99         if (error) {
  100                 kfree(mib, M_TEMP);
  101                 return (error);
  102         }
  103 
  104         get_mplock();
  105 
  106         switch (mib[0]) {
  107         case LINUX_CTL_KERN:
  108                 if (la.nlen < 2) {
  109                         error = ENOTDIR;
  110                         break;
  111                 }
  112 
  113                 switch (mib[1]) {
  114                 case LINUX_KERN_VERSION:
  115                         error = handle_string(&la, version);
  116                         break;
  117                 default:
  118                         error = ENOTDIR;
  119                         break;
  120                 }
  121                 break;
  122         default:
  123                 error = ENOTDIR;
  124                 break;
  125         }
  126         rel_mplock();
  127 
  128         if (error == ENOTDIR && mib) {
  129                 kprintf("linux: sysctl: unhandled name=");
  130                 for (i = 0; i < la.nlen; i++)
  131                         kprintf("%c%d", (i) ? ',' : '{', mib[i]);
  132                 kprintf("}\n");
  133         }
  134         if (mib)
  135                 kfree(mib, M_TEMP);
  136         return (error);
  137 }

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