xref: /linux/samples/kdb/kdb_hello.c (revision 762f99f4f3cb41a775b5157dd761217beba65873)
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  */
kdb_hello_cmd(int argc,const char ** argv)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 static kdbtab_t hello_cmd = {
32 	.name = "hello",
33 	.func = kdb_hello_cmd,
34 	.usage = "[string]",
35 	.help = "Say Hello World or Hello [string]",
36 };
37 
kdb_hello_cmd_init(void)38 static int __init kdb_hello_cmd_init(void)
39 {
40 	/*
41 	 * Registration of a dynamically added kdb command is done with
42 	 * kdb_register().
43 	 */
44 	kdb_register(&hello_cmd);
45 	return 0;
46 }
47 
kdb_hello_cmd_exit(void)48 static void __exit kdb_hello_cmd_exit(void)
49 {
50 	kdb_unregister(&hello_cmd);
51 }
52 
53 module_init(kdb_hello_cmd_init);
54 module_exit(kdb_hello_cmd_exit);
55 
56 MODULE_AUTHOR("WindRiver");
57 MODULE_DESCRIPTION("KDB example to add a hello command");
58 MODULE_LICENSE("GPL");
59