subprocess module does not accept file twice

[e070b1f7-4e7b-4562-9943-c9260e2621bb]

BPO	12031
Superseder	bpo-11432: webbrowser.open on unix fails.
Files	test.py: testcase

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GitHub fields: ```python assignee = None closed_at = created_at = labels = ['library', 'type-crash'] title = 'subprocess module does not accept file twice' updated_at = user = 'https://bugs.python.org/zmk' ``` bugs.python.org fields: ```python activity = actor = 'neologix' assignee = 'none' closed = True closed_date = closer = 'neologix' components = ['Library (Lib)'] creation = creator = 'zmk' dependencies = [] files = ['21935'] hgrepos = [] issue_num = 12031 keywords = [] message_count = 3.0 messages = ['135530', '135532', '135534'] nosy_count = 3.0 nosy_names = ['zmk', 'neologix', 'catalin.iacob'] pr_nums = [] priority = 'normal' resolution = 'out of date' stage = None status = 'closed' superseder = '11432' type = 'crash' url = 'https://bugs.python.org/issue12031' versions = ['Python 3.2'] ```

[e070b1f7-4e7b-4562-9943-c9260e2621bb]

I want to pass /dev/null as stdin and stderr.

This works from python 2.4 .. 3.2a3

It fails in final 3.2 with 'Bad file descriptor':

Traceback (most recent call last):
  File "test.py", line 11, in <module>
    Popen(['cat', 'file.txt'], stdout = PIPE, stdin = _in, stderr = _err)
  File "/opt/apps/python320/lib/python3.2/subprocess.py", line 736, in __init__
    restore_signals, start_new_session)
  File "/opt/apps/python320/lib/python3.2/subprocess.py", line 1330, in _execute_child
    raise child_exception_type(errno_num, err_msg)
OSError: [Errno 9] Bad file descriptor

[5cd58f33-69a6-4482-a1e1-fa5df5a17f40]

I can reproduce this on 3.2 final but not on the tip of the 3.2 branch so it seems to have been fixed.

[79528080-9d85-4d18-8a2a-8b1f07640dd7]

It's a duplicate of issue bpo-11432: http://bugs.python.org/issue11432