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Line 1: {{Short description\|Low-level debugger}} The modular debugger (mdb) is an extensible, low-level debugger used on all operating systems that are based on the open sourced [[Solaris]] operating system, such as [[Illumos]], for post-mortem analysis of an application or kernel. The mdb project was started inside of Sun to replace the aging [[adb]] debugger (made by [[Steve Bourne]]) that was previously used with the system. Mdb is backward-compatible with adb. The '''modular debugger''' ('''mdb''') is an extensible, low-level debugger developed by [[Sun Microsystems]] for the [[Solaris (operating system)\|Solaris]] 7 operating system. It is now open sourced, under the [[Common Development and Distribution License]] (CDDL). Its source code is now available in all open source derivatives of Solaris, such as [[Illumos]].<ref>{{cite web\|url=http://src.illumos.org/source/xref/illumos-gate/usr/src/cmd/mdb/common/mdb/\|title=mdb source in Illumos}}</ref> ==History== The mdb project was started in 1997 by [[Mike Shapiro (programmer)\|Mike Shapiro]] and others when the Solaris operating system was adding support for 64-bit architectures. Up until that point, Solaris was using the aging [[Advanced Debugger\|adb]] debugger developed by [[Steve Bourne]] (initially for [[Seventh Edition UNIX]]<ref>{{man\|1\|adb\|v7}}</ref>). It was very difficult to simply port adb from a 32-bit architecture to a 64-bit architecture, so Sun engineers decided to make a new debugger that would feature enhanced debugging capabilities, while being backward compatible with adb. ==See also== [[dbx (debugger)]] ==References== {{cite journal \| author = Mike Shapiro \|date=February 2009 \| title = Purpose Built Languages \| journal = [[ACM Queue]] \| volume = 7 \| issue = 1 \| pages = 18–24 \| doi = 10.1145/1508211.1508217 \| id = \|doi-access = free }} {{reflist}} {{Solaris}} [[Category:Debuggers]]