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From man poll(2), poll does not set errno=EAGAIN on interrupt, however it does set errno=EINTR. Have libvirt retry on the appropriate errno. Under heavy load, a program of mine kept getting libvirt errors 'poll on socket failed: Interrupted system call'. The signals were SIGCHLD from processes forked by threads unrelated to those using libvirt.
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>