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