[ python-Bugs-1506758 ] If MAXFD too high, popen2/subprocess produce MemoryErrors

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Bugs item #1506758, was opened at 2006-06-15 16:06
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Peter Vetere (pav3901)
Assigned to: Nobody/Anonymous (nobody)
Summary: If MAXFD too high, popen2/subprocess produce MemoryErrors

Initial Comment:
Both the subprocess and the popen2 modules use the
range(...) function to iterate over and close inherited
file descriptors when a subprocess is spawned.  In the
OS environment, it possible (using ulimit -n) to set
SC_OPEN_MAX (and thus MAXFD in these modules) to a very
high value.  This can exhaust the limitations of the
range() function, producing a MemoryError.  The better
thing to do would be to use xrange() instead.

In particular, this bug occurs in
subprocess._close_fds()  and popen2._run_child().


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