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* gdb.texinfo (Hooks): Document the new post-hook functionality.

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From Steven Johnson <sbjohnson@ozemail.com.au>.
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Eli Zaretskii 2000-09-26 15:53:59 +00:00
parent 81d4177baa
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gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2000-09-26 Eli Zaretskii <eliz@is.elta.co.il>
* gdb.texinfo (Hooks): Document the new post-hook functionality.
From Steven Johnson <sbjohnson@ozemail.com.au>.
2000-08-10 Mark Kettenis <kettenis@gnu.org>
* gdbint.texinfo (Overall Structure): Spelling fix.

39
gdb/doc/gdb.texinfo
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@ -11859,12 +11859,30 @@ messages when used in a user-defined command.
@section User-defined command hooks
@cindex command hooks
@cindex hooks, for commands
@cindex hooks, pre-command
You may define @emph{hooks}, which are a special kind of user-defined
@kindex hook
@kindex hook-
You may define @dfn{hooks}, which are a special kind of user-defined
command. Whenever you run the command @samp{foo}, if the user-defined
command @samp{hook-foo} exists, it is executed (with no arguments)
before that command.
@cindex hooks, post-command
@kindex hookpost
@kindex hookpost-
A hook may also be defined which is run after the command you executed.
Whenever you run the command @samp{foo}, if the user-defined command
@samp{hookpost-foo} exists, it is executed (with no arguments) after
that command. Post-execution hooks may exist simultaneously with
pre-execution hooks, for the same command.
It is valid for a hook to call the command which it hooks. If this
occurs, the hook is not re-executed, thereby avoiding infinte recursion.
@c It would be nice if hookpost could be passed a parameter indicating
@c if the command it hooks executed properly or not. FIXME!
@kindex stop@r{, a pseudo-command}
In addition, a pseudo-command, @samp{stop} exists. Defining
(@samp{hook-stop}) makes the associated commands execute every time
@ -11889,6 +11907,25 @@ handle SIGLARM pass
end
@end example
As a further example, to hook at the begining and end of the @code{echo}
command, and to add extra text to the beginning and end of the message,
you could define:
@example
define hook-echo
echo <<<---
end
define hookpost-echo
echo --->>>\n
end
(@value{GDBP}) echo Hello World
<<<---Hello World--->>>
(@value{GDBP})
@end example
You can define a hook for any single-word command in @value{GDBN}, but
not for command aliases; you should define a hook for the basic command
name, e.g. @code{backtrace} rather than @code{bt}.