linux/samples/kdb/kdb_hello.c
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   1/*
   2 * Created by: Jason Wessel <jason.wessel@windriver.com>
   3 *
   4 * Copyright (c) 2010 Wind River Systems, Inc.  All Rights Reserved.
   5 *
   6 * This file is licensed under the terms of the GNU General Public
   7 * License version 2. This program is licensed "as is" without any
   8 * warranty of any kind, whether express or implied.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/kdb.h>
  13
  14/*
  15 * All kdb shell command call backs receive argc and argv, where
  16 * argv[0] is the command the end user typed
  17 */
  18static int kdb_hello_cmd(int argc, const char **argv)
  19{
  20        if (argc > 1)
  21                return KDB_ARGCOUNT;
  22
  23        if (argc)
  24                kdb_printf("Hello %s.\n", argv[1]);
  25        else
  26                kdb_printf("Hello world!\n");
  27
  28        return 0;
  29}
  30
  31
  32static int __init kdb_hello_cmd_init(void)
  33{
  34        /*
  35         * Registration of a dynamically added kdb command is done with
  36         * kdb_register() with the arguments being:
  37         *   1: The name of the shell command
  38         *   2: The function that processes the command
  39         *   3: Description of the usage of any arguments
  40         *   4: Descriptive text when you run help
  41         *   5: Number of characters to complete the command
  42         *      0 == type the whole command
  43         *      1 == match both "g" and "go" for example
  44         */
  45        kdb_register("hello", kdb_hello_cmd, "[string]",
  46                     "Say Hello World or Hello [string]", 0);
  47        return 0;
  48}
  49
  50static void __exit kdb_hello_cmd_exit(void)
  51{
  52        kdb_unregister("hello");
  53}
  54
  55module_init(kdb_hello_cmd_init);
  56module_exit(kdb_hello_cmd_exit);
  57
  58MODULE_AUTHOR("WindRiver");
  59MODULE_DESCRIPTION("KDB example to add a hello command");
  60MODULE_LICENSE("GPL");
  61
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