From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cagney <ac131313@cygnus.com>
To: Andrew Cagney <ac131313@cygnus.com>
Cc: GDB Discussion <gdb@sources.redhat.com>
Subject: Re: gdb/remote - I/O
Date: Mon, 14 May 2001 08:55:00 -0000
Message-id: <3AFEB7F2.6050803@cygnus.com>
References: <3ABBDDE4.7C22709D@cygnus.com>
X-SW-Source: 2001-05/msg00251.html

Hello,

Given the recent discussion on the qSymbol packet and a comment that the 
target should be able to initiate such an interaction, I'd like to 
propose the following as a possible interaction.


	<target running>

	<- T00;qSymbol;qIn;
.
		i.e. the target can stop and
		drop a big hint that it would
		like to be probed for the given
		packet - here qSymbol and qIn
		The target has also bundled up
		some output data.

	-> qIn;<bytes-of-input>

		Something goes in the .....
		it might be bytes of input
		it might be something else

	<- "" packet not recognized
	<- "OK" nothing at present


	-> qSymbol....
	<- ....
	-> qSumbol....
	<- ....

	-> C
		The exchange is finished continue
		the target.

	<target resumes execution>

The main point is that this allows the target to initiate an interaction 
by pigybacking what they want on a dummy ``T'' packet while at the same 
time leaving the host in control - all interactions still being host 
initiated.

	Andrew