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authorJason Wessel2010-10-25 10:14:05 -0500
committerJason Wessel2010-10-29 13:14:39 -0500
commit4aad8f51d0672f1c95e2cf0e1bc7b9ab42d8e1ea (patch)
tree51dc43c1b455cb6e166642051f64c80c7dd1d0b5 /samples/kdb
parent12ba8d1e9262ce81a695795410bd9ee5c9407ba1 (diff)
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kdb: Add kdb kernel module sample
Add an example of how to add a dynamic kdb shell command via a kernel module. Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'samples/kdb')
-rw-r--r--samples/kdb/Makefile1
-rw-r--r--samples/kdb/kdb_hello.c60
2 files changed, 61 insertions, 0 deletions
diff --git a/samples/kdb/Makefile b/samples/kdb/Makefile
new file mode 100644
index 000000000000..fbedf39d9356
--- /dev/null
+++ b/samples/kdb/Makefile
@@ -0,0 +1 @@
obj-$(CONFIG_SAMPLE_KDB) += kdb_hello.o
diff --git a/samples/kdb/kdb_hello.c b/samples/kdb/kdb_hello.c
new file mode 100644
index 000000000000..c1c2fa0f62c2
--- /dev/null
+++ b/samples/kdb/kdb_hello.c
@@ -0,0 +1,60 @@
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");