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From:	"Mark Watson" <mchu7mw4 AT fs2 DOT ee DOT umist DOT ac DOT uk>
To:	cygwin AT sourceware DOT cygnus DOT com
Date:	Thu, 2 Mar 2000 12:08:43 GMT
MIME-Version:	1.0
Subject:	Modules, Perl 5.005_03, Cygwin Beta20.1
Reply-to:	mchu7mw4 AT fs2 DOT ee DOT umist DOT ac DOT uk
X-mailer:	Pegasus Mail for Windows (v2.54)
Message-ID:	<D385167F6B@fs2.ee.umist.ac.uk>

I am trying to connect a C library to Perl. I have this working under 
Linux. However under Cygwin (on Win98) I am having problems.

The problem is in the wrapper code (I am using SWIG). This causes 
Perl to segfault due to accessing memory address 0.

SWIG uses Dynaloader to load the module. Rather than using the 
automatic booting of modules, I tried using each seperate function. 
As described in the Camel book. 

The DLL is loaded correctly. The symbol for boot_matrix (where matrix 
is the module name)  is found and the function is called sucessfully. 
I tested this with just a printf in the boot_matrix function. 

With a little further effort I discovered that the problem is due to 
the macro dSARGS. This breaks down into further macros and eventually 
it tries to dereference some pointers. PL_stack_something I think - I 
can't remember:-( Anyway the point is that these pointers are not 
initialised to anything (i.e. they are normally 0). 

Presumably these are intialised by importing the variables into the 
DLL somehow. Has anyone got this sort of thing to work? If so  - 
please help!

Thank you,

Mark Watson


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