[ python-Bugs-1223937 ] subprocess.py abuse of errno

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Bugs item #1223937, was opened at 2005-06-20 06:56
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Category: Python Library
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Oren Tirosh (orenti)
Assigned to: Nobody/Anonymous (nobody)
Summary: subprocess.py abuse of errno

Initial Comment:
The CalledProcessError exception's .errno attribute is
set to a child process return code which is not an
errno. Any attempt to look up this number with
os.strerror() or errno.errorcode[] will result in
meaningless output. This can break existing code that
catches OSError and does not expect CalledProcessError.

Possible resolutions:

1. Don't make CalledProcessError a subclass of OSError
2. If CalledProcessError stays a subclass of OSError
.errno should be set to some specific meaningful value
(which one? add new value to errnomodule.c?) and use a
separate attribute for the child process return code.


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