[issue10812] Add some posix functions

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

First couple comments:
- you don't have to modify Misc/NEWS yourself; it will probably make patch maintenance easier
- it would seem more natural for readv() to take a sequence of writable buffers (such as bytearrays) instead; I don't think the current signature is very useful
- readv() and writev() should support both lists and tuples, at the minimum (perhaps arbitrary iterables if you like to spend more time on it :-)): see the PySequence* API

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<http://bugs.python.org/issue10812>
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