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/modules/example/example.c

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    1 /*      $NetBSD: example.c,v 1.3 2008/04/28 20:24:09 martin Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
    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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   26  * POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __KERNEL_RCSID(0, "$NetBSD: example.c,v 1.3 2008/04/28 20:24:09 martin Exp $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 
   36 MODULE(MODULE_CLASS_MISC, example, NULL);
   37 
   38 static
   39 void
   40 handle_props(prop_dictionary_t props)
   41 {
   42         prop_string_t str;
   43 
   44         str = prop_dictionary_get(props, "msg");
   45         if (str == NULL)
   46                 printf("The 'msg' property was not given.\n");
   47         else if (prop_object_type(str) != PROP_TYPE_STRING)
   48                 printf("The 'msg' property is not a string.\n");
   49         else {
   50                 const char *msg = prop_string_cstring_nocopy(str);
   51                 if (msg == NULL)
   52                         printf("Failed to process the 'msg' property.\n");
   53                 else
   54                         printf("The 'msg' property is: %s\n", msg);
   55         }
   56 }
   57 
   58 static int
   59 example_modcmd(modcmd_t cmd, void *arg)
   60 {
   61 
   62         switch (cmd) {
   63         case MODULE_CMD_INIT:
   64                 printf("Example module loaded.\n");
   65                 handle_props(arg);
   66                 break;
   67 
   68         case MODULE_CMD_FINI:
   69                 printf("Example module unloaded.\n");
   70                 break;
   71 
   72         case MODULE_CMD_STAT:
   73                 printf("Example module status queried.\n");
   74                 return ENOTTY;
   75 
   76         default:
   77                 return ENOTTY;
   78         }
   79 
   80         return 0;
   81 }

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