regress/sys/kern/lkmcommon/lkminit_test.c

   1 /*      $NetBSD: lkminit_test.c,v 1.1 2007/01/17 20:56:49 ad Exp $      */
   2
   3 /*
   4  * Copyright (c) 1993 Terrence R. Lambert.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Terrence R. Lambert.
  18  * 4. The name Terrence R. Lambert may not be used to endorse or promote
  19  *    products derived from this software without specific prior written
  20  *    permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
  23  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * from NetBSD: lkminit_test.c,v 1.6 2005/12/11 12:24:49 christos Exp
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __KERNEL_RCSID(0, "$NetBSD: lkminit_test.c,v 1.1 2007/01/17 20:56:49 ad Exp $");
  39
  40 #include <sys/param.h>
  41 #include <sys/ioctl.h>
  42 #include <sys/systm.h>
  43 #include <sys/conf.h>
  44 #include <sys/mount.h>
  45 #include <sys/exec.h>
  46 #include <sys/lkm.h>
  47 #include <sys/file.h>
  48 #include <sys/errno.h>
  49 #include <sys/syscall.h>
  50
  51 int     testcall(struct lwp *, void *, register_t *);
  52 int     LKMENTRY(struct lkm_table *lkmtp, int, int);
  53 int     sys_lkmnosys(struct lwp *, const void *, register_t *);
  54 int     testmod_handle(struct lkm_table *, int);
  55
  56 static struct sysent newent = {
  57         0, 0, 0, (void *)testcall
  58 };
  59
  60 static struct sysent    oldent;
  61
  62 MOD_MISC("testmod");
  63
  64 int
  65 testmod_handle(struct lkm_table *lkmtp, int cmd)
  66 {
  67         struct lkm_misc *args = lkmtp->private.lkm_misc;
  68         int i, err = 0;
  69
  70         switch( cmd) {
  71         case LKM_E_LOAD:
  72                 if(lkmexists( lkmtp))
  73                         return( EEXIST);
  74                 for (i = 0; i < SYS_MAXSYSCALL; i++)
  75                         if ((void *)sysent[i].sy_call == sys_lkmnosys)
  76                                 break;
  77                 if (i == SYS_MAXSYSCALL) {
  78                         err = ENFILE;
  79                         break;
  80                 }
  81                 memcpy(&oldent, &sysent[i], sizeof(struct sysent));
  82                 memcpy(&sysent[i], &newent, sizeof(struct sysent));
  83                 args->mod.lkm_offset = i;
  84                 break;
  85
  86         case LKM_E_UNLOAD:
  87                 i = args->mod.lkm_offset;
  88                 memcpy(&sysent[i], &oldent, sizeof(struct sysent));
  89                 break;
  90
  91         default:
  92                 err = EINVAL;
  93                 break;
  94         }
  95
  96         return err;
  97 }
  98
  99 int
 100 LKMENTRY(struct lkm_table *lkmtp, int cmd, int ver)
 101 {
 102         DISPATCH(lkmtp,cmd,ver,testmod_handle,testmod_handle,lkm_nofunc)
 103 }