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<title>1 Introduction </title>
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<H1><A NAME="SECTION000200000000000000000"> </A>
<BR>
1 Introduction
</H1>
<P>
The reason this module exists at all is that the SSL support in the socket
module in the Python 2.1 distribution (which is what we used, of course I
cannot speak for later versions) is severely limited.
<P>
When asking about SSL on the comp.lang.python newsgroup (or on
python-list@python.org) people usually pointed you to the M2Crypto package.
The M2Crypto.SSL module does implement a lot of OpenSSL's functionality but
unfortunately its error handling system does not seem to be finished,
especially for non-blocking I/O. I think that much of the reason for this
is that M2Crypto<A NAME="tex2html1"
HREF="#foot876"><SUP>1</SUP></A> is
developed using SWIG<A NAME="tex2html2"
HREF="#foot877"><SUP>2</SUP></A>. This
makes it awkward to create functions that e.g. can return both an integer and
NULL since (as far as I know) you basically write C functions and SWIG makes
wrapper functions that parses the Python argument list and calls your C
function, and finally transforms your return value to a Python object.
<P>
<BR><HR><H4>Footnotes</H4>
<DL>
<DT><A NAME="foot876">... M2Crypto</A><A
href="intro.html#tex2html1"><SUP>1</SUP></A></DT>
<DD>See <a class="url" href="http://www.post1.com/home/ngps/m2/">http://www.post1.com/home/ngps/m2/</a>
</DD>
<DT><A NAME="foot877">... SWIG</A><A
href="intro.html#tex2html2"><SUP>2</SUP></A></DT>
<DD>See <a class="url" href="http://swig.sourceforge.net/">http://swig.sourceforge.net/</a>
</DD>
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