TweetFollow Us on Twitter

Aug 97 MacTech Online

Volume Number: 13 (1997)
Issue Number: 8
Column Tag: MacTech Online

MacTech Online

by Nicholas C. "nick.c" DeMello <online@mactech.com>

It's Called MacsBug

Not MacBug, not MacBugs. The acronym stands for "Motorola advanced computer systems debugger." This powerful system extension allows developers to view and manipulate the contents of the Macintosh ram. You can download the latest version from Apple's Developer World ftp site, but if that (or any Apple ftp server) is busy check out Apple's "Software Home" page. The Software Home allows you to search for the latest version of any software Apple distributes.

MacsBug can be installed by simply dragging its file into your system folder (not your control panels folder, not your system extensions folder). When you restart your "Welcome to Macintosh" screen will display "debugger installed" if MacsBug loads (or the phrase "...carry a big stick" if you have a beta OS). Once installed, you can drop into MacsBug by hitting the command and power (triangle) keys together. Older systems require a system extension called programmers key to drop into MacsBug. Dropping into MacsBug suspends all processes and allows you direct access to all values in memory (great for pausing Doom). To return to the finder hit command-G, or to restart your Mac type "rs."

One way to learn more about using MacsBug is to drop into it and type "help" (or if you'd rather get the same information without wandering around your system memory visit Thomas Kimpton's MacsBug Help page). The Code Mechanic, Dave Evans, has at least three develop articles about wielding MacsBug (my favorite was "Stalking the Wild Defect"). In the September 1994 MacTech tips and tidbits there is a nice example of how to build a MacsBug macro, and the neat trick of making it execute automatically, every time MacsBug is entered. Check it out on the MacTech website.

Sleuthing through your systems memory is only half the fun though. When you've built up enough confidence to try and manipulate some memory see the Kool MacsBug Tricks page.

Download MacsBug from Devworld
ftp://ftp.apple.com/devworld/Tool_Chest/Testing_-_Debugging/Debuggers_-_dcmds/
Find the Latest Apple Software at Apple's "Software Home"
http://support.info.apple.com/ftp/swhome.html
Download Programmers Key or EvenBetterBusError
ftp://ftp.apple.com/devworld/Tool_Chest/Testing_-_Debugging/General_tools/
MacsBug Help
http://www.ambrosiasw.com/~dnebing/macsbug.html
Stalking the Wild Defect
http://devworld.apple.com/dev/techsupport/develop/issue27/balance.html
The MacsBug "Every time" Macro, MacTech Archives
www.mactech.com/articles/mactech/Vol.10/10.09/Sep94Tips/index.html
Kool MacsBug Tricks
http://gossamer.wheatonma.edu/users/bcote/syzgycult/Macsbug.html

EvenBetterBusError -- The Art of the Controlled Crash

EvenBetterBusError crashes your Mac. Unlike most software though, Greg Marriott's system extension does so on purpose. When you have EBBE installed, if your code dereferences a NIL pointer, writes to a NIL pointer, or attempts to execute code at NIL EBBE will crash your Mac (dropping you into MacsBug). Greg has put EBBE and three other stress testing tools that he developed at Apple on the web. Greg warns that some these tools are showing a little age, and recommends folks consider Onyx technologies commercial stress testing tools. Onyx's QC is an established and well respected stress tester. If you want to shake your code -- hard: give it to QC.

Oh, and those of you looking for the fourth generation of Mr. BusError can find YetEvenBetterBusError (aka DavesBetterBusError) beta on Dave Evan's web site. This more aggressive version of EBBE, announced in the May 1997 MacTech, can also be found on the MacTech ftp site along with the Tidy Heap C++ class library (for tracking proper use of new and delete).

EvenBetterBusError & Other Kool Tools by Greg Marriott
http://www.spies.com/~greg/tools.html
About QC...
http://www.onyx-tech.com/faq/current_QC_faq.html
Dave Evans & DavesBetterBusError
http://ng.netgate.net/~tilde/mechanic/
YEBBE & Tidy Heap
ftp://ftp.mactech.com//mactech/src/13.05/

Parting Shots

Next month MacTech Online is going to get serious about Java -- really. One last debugging tool you should check out before then is the Zone Ranger. Zone Ranger is a valuable tool for the counts and total sizes of the free blocks, pointers, handles, locked handles, purgeable handles, and resource handles that can be found on the Metrowerks web site. See you next month.

-- nick.c <online@mactech.com>

Joshua Golub's Zone Ranger
http://www.metrowerks.com/tools/software/zoneranger.html
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

VOX 2.8.24 - Music player that supports...
VOX just sounds better! The beauty is in its simplicity, yet behind the minimal exterior lies a powerful music player with a ton of features and support for all audio formats you should ever need.... Read more
Dropbox 24.4.17 - Cloud backup and synch...
Dropbox is an application that creates a special Finder folder that automatically syncs online and between your computers. It allows you to both backup files and keep them up-to-date between systems... Read more
OmniPlan Pro 3.7.1 - Professional-grade...
With OmniPlan Pro, you can create logical, manageable project plans with Gantt charts, schedules, summaries, milestones, and critical paths. Break down the tasks needed to make your project a success... Read more
OmniPlan 3.7.1 - Robust project manageme...
With OmniPlan, you can create logical, manageable project plans with Gantt charts, schedules, summaries, milestones, and critical paths. Break down the tasks needed to make your project a success,... Read more
Adium 1.5.10.4 - Popular instant messagi...
Adium is a fast and free instant messaging client which supports AIM, ICQ, Jabber, MSN, Yahoo!, Google Talk, Yahoo! Japan, Bonjour, Gadu-Gadu, Novell Groupwise, SIP/SIMPLE (Text), and Lotus Sametime... Read more
SteerMouse 5.1 - Powerful third-party mo...
SteerMouse is an advanced driver for USB and Bluetooth mice. It also supports Apple Mighty Mouse very well. SteerMouse can assign various functions to buttons that Apple's software does not allow,... Read more
File Juicer 4.57 - $18.00
File Juicer is a drag-and-drop can opener and data archaeologist. Its specialty is to find and extract images, video, audio, or text from files which are hard to open in other ways. In computer... Read more
1Password 6.7 - Powerful password manage...
1Password is a password manager that uniquely brings you both security and convenience. It is the only program that provides anti-phishing protection and goes beyond password management by adding Web... Read more
CleanMyMac 3.8.1 - $39.95
CleanMyMac makes space for the things you love. Sporting a range of ingenious new features, CleanMyMac lets you safely and intelligently scan and clean your entire system, delete large, unused files... Read more
Monolingual 1.7.8 - Remove unwanted OS X...
Monolingual is a program for removing unnecesary language resources from OS X, in order to reclaim several hundred megabytes of disk space. If you use your computer in only one (human) language, you... Read more

Latest Forum Discussions

See All

Olli by Tinrocket (Photography)
Olli by Tinrocket 1.0 Device: iOS iPhone Category: Photography Price: $2.99, Version: 1.0 (iTunes) Description: Get drawn in with Olli by TinrocketOlli instantly turns your everyday moments into hand-drawn art and animations. • Watch... | Read more »
Penarium (Games)
Penarium 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: | Read more »
Fire Emblem Heroes is way more profitabl...
Profits for Nintendo's mobile game Fire Emblem Heroes are apparently impressive enough to beat out other Nintendo titles likeSuper Mario Run, despite having 10 times fewer downloads. [Read more] | Read more »
Classic series Robot Unicorn Attack 3 no...
The classic Adult Swim browser game, Robot Unicorn Attack, branched off into a series of popular mobile games. Now, the latest entry into the series, Robot Unicorn Attack 3, is available for iOS and Android mobile devices. [Read more] | Read more »
Sudoku Sweeper (Games)
Sudoku Sweeper 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: A minimalist mashup of Minesweeper and Sudoku. Logic puzzle perfection. Every row, column and zone contains a bomb and one of... | Read more »
Under Leaves (Games)
Under Leaves 1.0.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0.0 (iTunes) Description: Journey into the forest, the jungle or the depths of the deep blue sea. Find chestnuts for the pigs, a caterpillar for the... | Read more »
Ninja Pizza Girl (Games)
Ninja Pizza Girl 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: In the not-so-distant future, rampart traffic congestion has resulted in only one way to deliver pizzas across town in thirty... | Read more »
SCRAP (Games)
SCRAP 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: That day, for no apparent reason, SCRAP decided to wake up and run. He had to, because his activation was a mistake the "Factory" could... | Read more »
The Bunker (Games)
The Bunker 1.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.1 (iTunes) Description: The critically acclaimed console hit "The Bunker" comes to iOS, The groundbreaking live-action thriller adventure set in a real... | Read more »
Die With Glory (Games)
Die With Glory 1.2.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.2.0 (iTunes) Description: Die with Glory is an epic adventure game where your goal is to die in glorious fashion. You must help Sigurd, a brave old... | Read more »

Price Scanner via MacPrices.net

New System Clock for macOS by B-Eng Now Avail...
Fehraltorf, Switzerland based B-Eng has announced the release and immediate availability of System Clock, the company’s new system monitor and information app developed exclusively for macOS. System... Read more
DEVONtechnologies Celebrates 15th Anniversary...
DEVONtechnologies celebrates its 15th company anniversary with a 30% discount on all its software products from May 1st through 5th, 2017. In spring 2002, DEVONtechnologies opened its website and... Read more
WaterField Designs Invites Customers to Help...
San Francisco based WaterField Designs invites customers and air travelers to participate in developing the next generation in-flight travel case, the Air Porter. Frustrated with limited legroom,... Read more
Save up to $260 with Apple refurbished 12-inc...
Apple has Certified Refurbished 2016 12″ Retina MacBooks available for $200-$260 off MSRP. Apple will include a standard one-year warranty with each MacBook, and shipping is free. The following... Read more
Digital Paper Tablet Offers Distraction Free...
I typically spend 8-10 hours a day gazing at the screens in my laptops and iPad, as tools of my livelihood, I don’t as a rule use electronic devices for pleasure reading. I subscribe to a daily... Read more
“Today at Apple” Bringing New Educational Ses...
Apple has announced plans to launch dozens of new educational sessions next month in all 495 Apple Stores ranging in topics from photo and video to music, coding, art and design, and more. The hands-... Read more
Smart Finance Free Comprehensive Personal Fin...
Moscow-based indie developer, Alexander Survillo has announced the release and immediate availability of Smart Finance: Personal Finance, Budget & Money 1.1.4, an update to his comprehensive... Read more
12-inch 1.1GHz Retina MacBooks on sale for $1...
B&H has 12″ 1.1GHz Retina MacBooks on sale for $100 off MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: - 12″ 1.1GHz Space Gray Retina MacBook: $1199.99 $100 off MSRP - 12... Read more
13-inch 2.7GHz Retina MacBook Pro on sale for...
B&H Photo has the 13″ 2.7GHz Retina MacBook Pro on sale for $130 off MSRP. Shipping is free, and B&H charges NY & NJ tax only: - 13″ 2.7GHz/128GB Retina MacBook Pro (MF839LL/A): $1169 $... Read more
15-inch 2.2GHz Retina MacBook Pros available...
B&H Photo has the 15″ 2.2GHz Retina MacBook Pro available for $200 off MSRP including free shipping plus NY & NJ sales tax only: - 15″ 2.2GHz Retina MacBook Pro (MJLQ2LL/A): $1799.99 $200 off... Read more

Jobs Board

*Apple* Retail - Multiple Positions- Chicago...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Systems Engineer - California Polyte...
Cal Poly, San Luis Obispo Apple Systems Engineer Department: ITS - Customer & Tech Support (134900) College/Division: Academic Affairs Salary Range: Position Read more
*Apple* Mobile Master - Best Buy (United Sta...
**501042BR** **Job Title:** Apple Mobile Master **Location Number:** 000416-East Lansing-Store **Job Description:** **What does a Best Buy Apple Mobile Master Read more
Best Buy *Apple* Computing Master - Best Bu...
**501195BR** **Job Title:** Best Buy Apple Computing Master **Location Number:** 000211-Colorado Blvd-Store **Job Description:** **What does a Best Buy Apple Read more
*Apple* Mac Computer Technician - GeekHampto...
…complex computer issues over the phone and in person? GeekHampton, Long Island's Apple Premium Service Provider, is looking for you! Come work with our crew Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.