DB_COMMAND(9) BSD Kernel Developer's Manual DB_COMMAND(9)NAME
DB_COMMAND, DB_SHOW_COMMAND, DB_SHOW_ALL_COMMAND — Extends the ddb com‐
The DB_COMMAND() macro adds command_name to the list of top-level com‐
mands. 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], trans‐
lates 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 exam‐
ple, the examine command will display words in decimal form
if it is passed the modifier "d".
In your module, the command is declared as:
db_printf("Calling my command with address %p\n", addr);
Then, when in ddb:
db> mycmd 0x1000
Calling my command with address 0x1000
This manual page was written by Guillaume Ballet ⟨firstname.lastname@example.org⟩.
BSD August 27, 2008 BSD