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>
diff --git a/samples/kdb/kdb_hello.c b/samples/kdb/kdb_hello.c
new file mode 100644
index 0000000..c1c2fa0
--- /dev/null
+++ b/samples/kdb/kdb_hello.c
@@ -0,0 +1,60 @@
+/*
+ * Created by: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (c) 2010 Wind River Systems, Inc. All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kdb.h>
+
+/*
+ * All kdb shell command call backs receive argc and argv, where
+ * argv[0] is the command the end user typed
+ */
+static int kdb_hello_cmd(int argc, const char **argv)
+{
+ if (argc > 1)
+ return KDB_ARGCOUNT;
+
+ if (argc)
+ kdb_printf("Hello %s.\n", argv[1]);
+ else
+ kdb_printf("Hello world!\n");
+
+ return 0;
+}
+
+
+static int __init kdb_hello_cmd_init(void)
+{
+ /*
+ * Registration of a dynamically added kdb command is done with
+ * kdb_register() with the arguments being:
+ * 1: The name of the shell command
+ * 2: The function that processes the command
+ * 3: Description of the usage of any arguments
+ * 4: Descriptive text when you run help
+ * 5: Number of characters to complete the command
+ * 0 == type the whole command
+ * 1 == match both "g" and "go" for example
+ */
+ kdb_register("hello", kdb_hello_cmd, "[string]",
+ "Say Hello World or Hello [string]", 0);
+ return 0;
+}
+
+static void __exit kdb_hello_cmd_exit(void)
+{
+ kdb_unregister("hello");
+}
+
+module_init(kdb_hello_cmd_init);
+module_exit(kdb_hello_cmd_exit);
+
+MODULE_AUTHOR("WindRiver");
+MODULE_DESCRIPTION("KDB example to add a hello command");
+MODULE_LICENSE("GPL");