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");