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From:	<Eric DOT Zurcher AT csiro DOT au>
To:	<cygwin AT cygwin DOT com>
Date:	Wed, 23 Dec 2009 15:47:03 +1100
Subject:	Suggested improvement to cygload.cc
Message-ID:	<0A5E41F72813C247889F7974C8D764955C2978F45E@exvic-mbx04.nexus.csiro.au>
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Hi,

I've recently had need to dynamically load a Cygwin DLL into an non-Cygwin =
application. The FAQ entry for doing this and the associated sample applica=
tion (/src/winsup/testsuite/winsup.api/cygload.cc) are both a bit out-of-da=
te, though they still provided me with enough information to get this worki=
ng correctly.

A useful modification to cygload.cc and cygload.h might be to replace the f=
ixed size (currently 32768) used for "padding" with a dynamically determine=
d value. The number of bytes needed can be obtained by making the call:

int padSize =3D cygwin_internal(CW_CYGTLS_PADSIZE);

Making use of this value might require a bit more inline assembler (that's =
the approach I'm using), rather than simply declaring a variable to chew up=
 the stack space, but this might keep things from breaking if the padding s=
ize changes in future releases of cygwin1.dll.

I'm not sure who maintains this stuff, so I'm just posting this suggestion =
to the list, in the hope that someone can and will act upon it.

Thanks!

Eric Zurcher
CSIRO Plant Industry
Canberra, Australia
Eric DOT Zurcher AT csiro DOT au

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