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Allow the parent process to perform a bi-directional handshake with the child process during fork/exec. The child process will fork and do its initial setup. Immediately prior to the exec(), it will stop & wait for a handshake from the parent process. The parent process will spawn the child and wait until the child reaches the handshake point. It will do whatever extra setup work is required, before signalling the child to continue. The implementation of this is done using two pairs of blocking pipes. The first pair is used to block the parent, until the child writes a single byte. Then the second pair pair is used to block the child, until the parent confirms with another single byte. * src/util/command.c, src/util/command.h, src/libvirt_private.syms: Add APIs to perform a handshake
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>