Bugs item #998246, was opened at 2004-07-26 15:14
Message generated for change (Comment added) made by tseaver
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Tres Seaver (tseaver)
Assigned to: Neal Norwitz (nnorwitz)
Summary: Popen3.poll race condition
Initial Comment:
poll() swallows all IOErrors, including ENOCHILD; if
the child process exits before poll is called, then an
applications which loops on
poll() will never exit.
I am working around this (against Python 2.3.3) via the
following:
try:
pid, status = os.waitpid(proc.pid,
os.WNOHANG)
except os.error, e:
if e.errno == 10: # ENOCHILD
result = 0
else:
raise
else:
if pid == proc.pid:
result = status
where 'proc' is an instance of Popen3.
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>Comment By: Tres Seaver (tseaver)
Date: 2006-03-23 07:21
Message:
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1183780 is indeed a similar bug, although he reports it
against Popen4 rather than Popen3. His patch needs to be
modified to re-raise errors which are not ENOCHILD, however.
I no longer have accees to either the application or the
machine where I found this issue, and hence can't verify that
the patch fixes the code which triggered the problem.
----------------------------------------------------------------------
Comment By: Neal Norwitz (nnorwitz)
Date: 2006-03-23 03:45
Message:
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user_id=33168
I believe this is basically a duplicate of 1183780. There
is a patch attached there. Can you verify if it fixes your
problem?
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