Bugs item #1423153, was opened at 2006-02-02 18:25
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Category: Extension Modules
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Fazal Majid (majid)
Assigned to: Nobody/Anonymous (nobody)
Summary: mmap module leaks file descriptors on UNIX
Initial Comment:
On UNIX, mmapmodule.c makes a call to dup(2) prior to
mapping the file descriptor into memory (oddly enough,
it doesn't map the new fd resulting from dup(), but the
old one).
The close method does not release this file descriptor,
however, leading to a leak. If mmap is used repeatedly,
the process will eventually run out of file
descriptors, as can easily be shown with this test case:
import sys, os, mmap
for i in xrange(2000):
f = os.open('/dev/zero', os.O_RDWR)
m = mmap.mmap(f, 10000)
os.close(f)
a = m[0:100]
m[100:200] = 'F' * 100
m.close()
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