[issue1452] subprocess's popen.stdout.seek(0) doesn't raise an error

[Christian Heimes]

New submission from Christian Heimes:

On Linux:

>>> p = subprocess.Popen("ls", stdout=subprocess.PIPE)
>>> p.stdout.read()
b'...'
>>> p.stdout.seek(0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/heimes/dev/python/py3k/Lib/io.py", line 809, in seek
    pos = self.raw.seek(pos, whence)
IOError: [Errno 29] Illegal seek
>>> p.stdout.read()
b''

On Windows p.stdout.seek(0) does neither raise an error nor works as one
might expect it. The second read() returns an empty byte string, too.

----------
components: Windows
keywords: py3k
messages: 57585
nosy: tiran
severity: normal
status: open
title: subprocess's popen.stdout.seek(0) doesn't raise an error
versions: Python 3.0

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1452>
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