Description of problem: when opening connections to the xen hypervisor using the python bindings, open files persist even after the connection has been closed.


Version-Release number of selected component (if applicable):
>>> libvirt.getVersion()
8003
cloud1:~# aptitude show libvirt0 | grep Version
Version: 0.8.3-1

How reproducible: always

Steps to Reproduce: here is most of a log of a python session which demonstrates the problem (some lines containing '0' have been omitted)

cloud1:~# python
Python 2.6.6 (r266:84292, Aug 29 2010, 12:36:23) 
[GCC 4.4.5 20100824 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os, libvirt
>>> os.system("lsof -p %s | wc -l" % os.getpid())
33
>>> con = libvirt.openReadOnly('xen:///')
>>> os.system("lsof -p %s | wc -l" % os.getpid())
38
>>> con.close()
>>> os.system("lsof -p %s | wc -l" % os.getpid())
37
>>> con = libvirt.openReadOnly('xen:///')
>>> con.close()
>>> os.system("lsof -p %s | wc -l" % os.getpid())
40
>>> con = libvirt.open('xen:///')
>>> con.close()
>>> os.system("lsof -p %s | wc -l" % os.getpid())
43
>>> del con
>>> os.system("lsof -p %s | wc -l" % os.getpid())
43
>>> 

  
Actual results: every time a connection is opened and closed, the number of open files increases by 4 and then decreases by 1. this leaves 3 files open even after the connection has been closed.


Expected results: all the open files that are used by libvirt connection objects should be closed.


Additional info: eventually, this problem has been leading to "Too many open files" errors in my application:
libvirtError: cannot read file /sys/hypervisor/properties/capabilities: Too
many open files

The open files are a socket and two FIFO pipes; for instance:

python  20690 root   10u  unix 0xffff88000030ea00      0t0  201518 socket
python  20690 root   11r  FIFO                0,8      0t0  201520 pipe
python  20690 root   12w  FIFO                0,8      0t0  201520 pipe