[Libvir] problem with virConnectClose in libvirt 0.1.5
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After closing libvirt with virConnectClose, it's possible to open
libvirt again in the same program with virConnectOpen but following
operations on domains systematically fail.
In example:
conn = virConnectOpen(NULL);
dom = virDomainLookupByID(conn, id);
virDomainFree(dom);
virConnectClose(conn);
...
conn = virConnectOpen(NULL);
dom = virDomainLookupByID(conn, id);
==> ERROR
The second virDomainLookupByID call fails because of the do_connect()
function in xend_internal.c source file. In this function, the connect()
API returns ENOENT on the second virDomainLookupByID() call.
ENOENT return code isn't documented in the man of connect API !
I suppose that some cleaning are missing when virConnectClose is called
or in the opposite, too cleaning is done.
Regards.
On Wed, Sep 20, 2006 at 05:50:59PM +0200, Philippe Berthault wrote:
After closing libvirt with virConnectClose, it's possible to open
libvirt again in the same program with virConnectOpen but following
operations on domains systematically fail.
In example:
conn = virConnectOpen(NULL);
dom = virDomainLookupByID(conn, id);
virDomainFree(dom);
virConnectClose(conn);
...
conn = virConnectOpen(NULL);
dom = virDomainLookupByID(conn, id);
==> ERROR
The second virDomainLookupByID call fails because of the do_connect()
function in xend_internal.c source file. In this function, the connect()
API returns ENOENT on the second virDomainLookupByID() call.
ENOENT return code isn't documented in the man of connect API !
I suppose that some cleaning are missing when virConnectClose is called
or in the opposite, too cleaning is done.
Okay I reproduced this, (as user i.e. using the proxy) I will chase it
down should be easy, probably the file descriptor is not reset on Close.
And I will ad a python test for it,
thanks for raising this, did you got the problem as root ? It seems to
work for me as root, i.e. being a problem when reconnecting with the proxy.
Daniel
--
Red Hat Virtualization group http://redhat.com/virtualization/
Daniel Veillard | virtualization library http://libvirt.org/
veillard(a)redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
On Wed, Sep 20, 2006 at 05:50:59PM +0200, Philippe Berthault wrote:
After closing libvirt with virConnectClose, it's possible to open
libvirt again in the same program with virConnectOpen but following
operations on domains systematically fail.
Okay, I found it ... You could get this only if connecting though
the xend http interface and as non-root (i.e. not using the proxy),
basically xenDaemonGetVersion() was used to test the connection
when trying to reach the daemon, unfortunately it cached the version
value in a global variable, which means on reconnection it would go
ahead using a connection method believeing it worked while it didn't.
I just removed caching in xenDaemonGetVersion(), it's wrong anyway
at best this should be cached on the driver, certainly not global.
Fixed in CVS, thanks !
Daniel
--
Red Hat Virtualization group http://redhat.com/virtualization/
Daniel Veillard | virtualization library http://libvirt.org/
veillard(a)redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
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Daniel Veillard -
Philippe Berthault