What is Debugging with Purify?
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Answer / chaitanya
Purify is a debugging tool that is invoked when you compile your program. Purify adds code that detects when a memory error is going to occur and gives you feedback as to where and why. Purify will detect the following errors (plus a few more):
1. Reading or writing beyond the bounds of an array.
2. Reading or writing freed memory.
3. Reading and using uninitialized memory.
4. Reading or writing through null pointers.
5. Reading or writing beyond the end of the call stack.
6. Having memory leaks.
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What is Debugging with Purify?
How to obtain a memory dump from an application that crashes?
The assignment says I have to turn in a purify.output file, but the output goes to a window so I can't redirect it. How to I get the output to go to a file?
When I run my purify'ed executable, I get a cryptic message like "ld.so.1: ./server.purify: fatal: libsocket.so.1_pure_p3_c0_105022037_58_32_2171404S: open failed: No such file or directory." What's going on?
I'm getting a lot of UMR errors that I don't think my program is causing. We have to turn in a program that doesn't have any Purify errors. How do I get around these?
How do I run Purify?
I can't run Purify. Either when I compile or when I run my program, I get all sorts of unfriendly messages about not being able to write into a read-only file system. What's the problem?
DEVOPS comes under which categories?
I get a file descriptor in use error that comes from the socket libraries (/etc/.name_service_door). How do I supress it?
When I run 'purify', I get a warning message saying "Could not locate gcc demangler 'c++filt'..." I also get warnings saying "Unhandled reloc type R_SPARC_DISP32..." Is this expected?
When I issue "make all.purify" for the echodemo example, I see a message that says "In order for Rational PurifyPlus to work properly, you must source the appropriate shell resource file in /usr/pubsw/etc/rational..." How do I fix this?
GDB 
