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Define a new RPC protocol for the virtlogd daemon that provides for handling of logs. The initial RPC method defined allows a client to obtain a file handle to use for writing to a log file for a guest domain. The file handle passed back will not actually refer to the log file, but rather an anonymous pipe. The virtlogd daemon will forward I/O between them, ensuring file rotation happens when required. Initially the log setup is hardcoded to cap log files at 128 KB, and keep 3 backups when rolling over, which gives a max usage of 512 KB per guest. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>