On Thu, Jun 15, 2006 at 10:31:55AM -0400, Robert Dewar wrote: > Daniel Jacobowitz wrote: > > >>The point of going backwards (a feature quite familiar to me from > >>the use of hardware debuggers on PC's in bygone years) is to figure > >>out what went wrong, and for that purpose you only need to worry > >>about the machine/memory state. > > > >Not when you're debugging userspace and you have files. > > I just don't see that at all, if you can back up to previous > memory states, where the entire machine state is reproduced > that's good enough.
Well, of course. But we're talking about different concepts. You're talking about something that involves total I/O replay, which requires exclusive control of a piece of physical hardware. GDB will, and some other debuggers already do, support doing this entirely unprivileged, at a process level on Unix-like systems. -- Daniel Jacobowitz CodeSourcery
