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These three functions are very similar - none allow a MODIFY operation; you can only add or delete. The biggest difference between them (other than the data itself) is in the criteria for determining a match, and whether or not multiple matches are possible: 1) for HOST records, it's considered a match if the IP address or any of the hostnames of an existing record matches. 2) for SRV records, it's a match if all of domain+service+protocol+target *which have been specified* are matched. 3) for TXT records, there is only a single field to match - name (value can be the same for multiple records, and isn't considered a search term), so by definition there can be no ambiguous matches. In all three cases, if any matches are found, ADD will fail; if multiple matches are found, it means the search term was ambiguous, and a DELETE will fail. The upper level code in bridge_driver.c is already implemented for these functions - appropriate conf files will be re-written, and dnsmasq will be SIGHUPed or restarted as appropriate.
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>