DB_COMMAND(9)						   BSD Kernel Developer's Manual					     DB_COMMAND(9)

NAME

     DB_COMMAND, DB_SHOW_COMMAND, DB_SHOW_ALL_COMMAND -- Extends the ddb command set

SYNOPSIS

     #include <ddb/ddb.h>

     DB_COMMAND(command_name, command_function);

     DB_SHOW_COMMAND(command_name, command_function);

     DB_SHOW_ALL_COMMAND(command_name, command_function);

DESCRIPTION

     The DB_COMMAND() macro adds command_name to the list of top-level commands.  Invoking command_name from ddb will call command_function.

     The DB_SHOW_COMMAND() and DB_SHOW_ALL_COMMAND() are roughly equivalent to DB_COMMAND() but in these cases, command_name is a sub-command of
     the ddb show command and show all command, respectively.

     The general command syntax: command[/modifier] address[,count], translates into the following parameters for command_function:

	   addr 	 The address passed to the command as an argument.

	   have_addr	 A boolean value that is true if the addr field is valid.

	   count	 The number of quad words starting at offset addr that the command must process.

	   modif	 A pointer to the string of modifiers. That is, a series of symbols used to pass some options to the command. For example,
			 the examine command will display words in decimal form if it is passed the modifier "d".

EXAMPLE

     In your module, the command is declared as:

     DB_COMMAND(mycmd, my_cmd_func)
     {
	     if (have_addr)
		     db_printf("Calling my command with address %p
", addr);
     }

     Then, when in ddb:

     db> mycmd 0x1000
     Calling my command with address 0x1000
     db>

SEE ALSO

     ddb(4)

AUTHORS

     This manual page was written by Guillaume Ballet <gballet@gmail.com>.

BSD
								  August 27, 2008							       BSD