WAD (Wrapped Application Debugger)
David M. Beazley
Department of Computer Science
University of Chicago
Chicago, IL 60637
beazley@cs.uchicago.edu
Copyright (C) 2000
University of Chicago
All Rights Reserved
1. Introduction
WAD is an embedded error-recovery mechanism that allows fatal errors
such as SIGSEGV, SIGBUS, and SIGFPE to converted into exceptions for
use in scripting languages and similar systems.
Debugging Modes
---------------
The following WAD debugging modes can be set through the use of environment
variables:
WAD_DEBUG_SEGMENT - Displays information about the virtual memory
map and mapping of addresses to segments.
WAD_DEBUG_SYMBOL - Symbol table mapping.
WAD_DEBUG_OBJECT - Loading/Unloading of object files.
WAD_DEBUG_FILE - Loading/Unloading of raw files.
WAD_DEBUG_HOLD - Freezes WAD before it returns from the signal handler.
Useful if you need to attach a debugger to WAD itself.
WAD_DEBUG_STABS - Display stabs data.
WAD_DEBUG_RETURN - Display information about WAD return points.
WAD_DEBUG_SYMBOL_SEARCH - Display all symbols in the symbol table that are
searched.
WAD_DEBUG_INIT - Print initialization information.
WAD_NOSTACK - Do NOT use an alternative signal handling stack.
This may be necessary on certain Linux systems when
threads are being used.
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