[issue6939] shadows around the io truncate() semantics

[Pascal Chambon]

Pascal Chambon <chambon.pascal at gmail.com> added the comment:

Thanks for the detailed feedback.

According to what you said (and to details found in python docs), the current _fileio.truncate is actually quite buggy -> no reference counting ops were done on posobj, even though it's sometimes retrieved from _portable_seek, and returned or not depending on rare error cases (SetEndOfFile failing etc.).

Here is a patch fixing all that for python2.6, I've tested it manually in debug mode, and against memoryio/io/fileio tests ; hope it will be OK.

As soon as this one is certified, I'll prepare a patch for python2.7

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Added file: http://bugs.python.org/file15909/patch26_truncate_pos_refcounts.patch

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