[Patches] [ python-Patches-1575506 ] Mailbox will not lock properly after flush()

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Patches item #1575506, was opened at 2006-10-11 15:56
Message generated for change (Settings changed) made by deuxpi
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Category: Library (Lib)
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Philippe Gauthier (deuxpi)
Assigned to: Nobody/Anonymous (nobody)
>Summary: Mailbox will not lock properly after flush()

Initial Comment:
The _singlefileMailbox class will try to lock the wrong
file object after a flush(), resulting into an
operation on a closed file object. 

The following code should illustrate the bug. See also
the attached patch.

>>> import mailbox
>>>
>>> box = mailbox.mbox('mbox')
>>> msg = "Subject: sub\n\nbody\n"
>>> box.add(msg)
0
>>> box.flush()
>>> box.close()
>>>
>>> box = mailbox.mbox('mbox')
>>> box.lock()
>>> box.add(msg)
1
>>> box.flush()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/mailbox.py", line 581, in flush
    _lock_file(new_file, dotlock=False)
  File "/usr/lib/python2.5/mailbox.py", line 1847, in
_lock_file
    fcntl.lockf(f, fcntl.LOCK_UN)
ValueError: I/O operation on closed file

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