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When the last callback is removed using domainEventDeregister(), the
events dispatcher is deregistered from the C-library, but
domainEventsCallbacks is still an empty list.
On shutdown __del__() deregisters the dispatacher again, which SEGVs
# You need the event-loop implementation from the Python examples;
# give the file a name which is importable by Python.
ln examples/domain-events/events-python/event-test.py eloop.py
python -c 'from eloop import *
import sys
def dump(*args): print " ".join(map(str, args))
virEventLoopPureStart()
c = libvirt.open("xen:///")
c.domainEventRegister(dump, None)
c.domainEventDeregister(dump)
sys.exit(0)'
domainEventDeregister() needs to delete domainEventCallbacks so subsequent
calls to __del__() and domainEventRegister() choose the right code paths.
Setting it to None is not enough, since calling domainEventRegiser() again
would trigger an TypeError.
Signed-off-by: Philipp Hahn <hahn@univention.de>
libvirt Python Bindings README
==============================
Most of the libvirt python binding code is automatically generated
using the script generator.py, and the API description from
docs/libvirt-api.xml
Manually written files:
- libvirt-override.c: methods where the C binding needs to be hand crafted
- libvirt-override.py: global methods where the C and python bindings have different args
- libvirt-override-api.xml: methods where the auto-extracted API docs are not
suitable for python auto-generator. Overriding this if the method is going
into libvirt-override.c, but we still want auto-generated libvirt-override.py
- libvirt-override-virConnect.py: virConnect class methods
- typewrappers.h,.c: Python object wrappers for each libvirt C object
Auto-generated files:
- libvirt.py: The main python binding. Comprises auto-generated code, along
with contents from libvirt-override.py and libvirt-override-virConnect.py
- libvirt.c, libvirt.h: The C glue layer for the python binding. Comprises
auto-generated code, along with libvirt-override.c
- libvirt-export.c: List of auto-generated C methods, included into
the libvirt-override.c method table