[issue8214] Add exception logging function to syslog module

[Sean Reifschneider]

Sean Reifschneider <jafo at tummy.com> added the comment:

Thanks for the review Jack.

I was very tempted to split it into C and Python components, but I decided
against it because it's so close to the 2.7 release.  I think it would be
best to defer that for the Python 3 release, because of potential packaging
issues.  I'm open to discussion on that though.

I've changed all the return(NULL)s in the package.

NULL check on saved_hook is done.

I also had the same thought about the saved_hook/syslog ordering, so I've
changed it.

I've added soe unit tests.  I tried getting fancy and testing the exception
handling, but had to fork to do it and then unittests were still catching
the exception, so I just left it the minimal set of tests I put in there.

Thanks.

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Added file: http://bugs.python.org/file17174/logexception3.patch

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