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When registering a close callback, the connection refcount is increased as the connection object is passed to the callback and hence we must prevent deleting it too soon. However, when closing the connection, the connection object is just unrefed. So whenever a connection with a close callback is closed, we end up with the connection object which has exactly one reference. Leaving the code as-is doesn't mean the end of the world as we know it, but why give a bad example? ==14531== 288 bytes in 1 blocks are still reachable in loss record 695 of 762 ==14531== at 0x4C2BDE4: calloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==14531== by 0x4E9FE09: virAllocVar (viralloc.c:558) ==14531== by 0x4EDBE45: virObjectNew (virobject.c:190) ==14531== by 0x4F71AAC: virGetConnect (datatypes.c:116) ==14531== by 0x4F78511: do_open (libvirt.c:1136) ==14531== by 0x4F7B3AC: virConnectOpenAuth (libvirt.c:1481) ==14531== by 0x4011D2: main (event-test.c:499) (and other leaks tied to virGetConnect()) Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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LibVirt : simple API for virtualization Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It is free software available under the GNU Lesser General Public License. Virtualization of the Linux Operating System means the ability to run multiple instances of Operating Systems concurrently on a single hardware system where the basic resources are driven by a Linux instance. The library aim at providing long term stable C API initially for the Xen paravirtualization but should be able to integrate other virtualization mechanisms if needed. Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.
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