Path: utzoo!utgpu!watmath!iuvax!cica!tut.cis.ohio-state.edu!bloom-beacon!wesommer
From: wesommer@athena.mit.edu (William Sommerfeld)
Newsgroups: comp.windows.x
Subject: Re: Debugging while server grabs are present.
Message-ID: <WESOMMER.89Oct10174803@anubis.athena.mit.edu>
Date: 10 Oct 89 21:48:03 GMT
References: <126096@sun.Eng.Sun.COM>
Organization: /mit/wesommer/.organization
Lines: 19
In-reply-to: argv%turnpike@Sun.COM's message of 10 Oct 89 19:49:25 GMT

Way back, in the days of X10, there was a version of the X server
known as "Xnest"; its device driver was implemented on top of Xlib;
the "screen" was a window on some other (real or virtual) display.
You could run it inside itself N levels deep, although it got really
slow..

I don't think that Xnest survived to X11, but if it did, it could be
useful for debugging applications which do server grabs and played
similar games..

I believe that the GNU debugger lets you run an arbitrary sequence of
debugger commands when reaching a breakpoint; it also lets you make
function calls inside the target process (assuming that the target's
address space isn't smashed beyond repair).

					- Bill


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