samples/kdb/kdb_hello.c

   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 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
  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
  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");