topic Re: Core in Operating System - HP-UX

Core

Pratheesh — Tue, 27 May 2003 02:38:55 GMT

I have created an executable with gcc compiler. It is giving segmentation fault while executing, But not dumping core file. What is the option to set for dumping the core?

Re: Core

Adam J Markiewicz — Tue, 27 May 2003 08:45:29 GMT

Hi

AFAIK there is no dedicated mechanism to block core generation.

However check the following:
1. Doesn't your executable change its working directory? Corefile is always created in current directory at the moment of generation.
2. Does your executable have permission to create new files in its working directory?
3. Check value of ulimit - this is sometimes used to block core generation.

Good luck
Adam

Re: Core

Paula J Frazer-Campbell — Tue, 27 May 2003 08:52:08 GMT

Hi

TOC button on back of server/workstation ?

Paula

Re: Core

Jdamian — Tue, 27 May 2003 09:16:58 GMT

Don't push the TOC button as suggested by Paula

Re: Core

Dipu — Tue, 27 May 2003 09:45:52 GMT

Hi,
The core file is not generated because may be the size of the coredump file is fixed to zero
Check whether the following entry is there in the ".cshrc" file
"limit coredumpsize 0".
If so please remove this line from the ".cshrc" file.

Regards
Dipu

Re: Core

Zeev Schultz — Tue, 27 May 2003 10:38:52 GMT

check with ulimit -a for
coredump size.set with ulimit -c.
Are you using any gcc flags?Can also use
gdb with your build program and do tracing.

Re: Core

A. Clay Stephenson — Tue, 27 May 2003 13:21:38 GMT

Re: Core

A. Clay Stephenson — Tue, 27 May 2003 13:21:42 GMT

Re: Core

A. Clay Stephenson — Tue, 27 May 2003 13:25:03 GMT

The DEFAULT action for a segmentation violation is to dump core but that could have been circumvented by 1) ulimit -c 0 to limit the core file size to zero 2) having a custom SIGSEGV handler somewhere in your code (or a library) that replaces the default handler.

Manually inducing a program crash to cause a core dump is useless because the cause of your core dump (and thus the stack trace) would be completely unrelated to your problem.

Do a ulimit -a and see if the core file size is not set to zero. If it is zero, you've found your answer but otherwise you must examine your code for interrupt handlers.