[issue1520818] fcntl.ioctl fails to copy back exactly-1024 buffer

[G2P]

G2P added the comment:

The bug still exists in Python 2.6 (2.6.7-4ubuntu2). Python 2.7 (2.7.3-5ubuntu4) works correctly. I don't have Python 2.5 on hand to check.

Here is a very simple test case:

import array, fcntl
buf = array.array('B', [0]*1024)
fcntl.ioctl(0, termios.TIOCGPGRP, buf, 1)
assert any(by != 0 for by in buf)

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nosy: +G2P

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<http://bugs.python.org/issue1520818>
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