[issue10812] Add some posix functions

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

This patch:

Fixes test_lutimes(),
Ignores a posix_fallocate() failure on Solaris due to ZFS,
Changes readv() & writev() signatures such that they take sequences instead of tuples,
Changes readv() so that it takes a number of writable buffers, fills them and returns the total number of bytes read.

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Added file: http://bugs.python.org/file20273/10812_v2.patch

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