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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  */
 18 static 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 
 32 static 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 
 50 static void __exit kdb_hello_cmd_exit(void)
 51 {
 52         kdb_unregister("hello");
 53 }
 54 
 55 module_init(kdb_hello_cmd_init);
 56 module_exit(kdb_hello_cmd_exit);
 57 
 58 MODULE_AUTHOR("WindRiver");
 59 MODULE_DESCRIPTION("KDB example to add a hello command");
 60 MODULE_LICENSE("GPL");
 61 

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