Initial binlog prototype

Supports pulling binlogs from the master, caching to a local file and relaying to a slave.

Only tested with a single slave and a single MaxScale thread.

server/modules/routing/binlog/blr_cache.c

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+/*
+ * This file is distributed as part of MaxScale.  It is free
+ * software: you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation,
+ * version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright SkySQL Ab 2014
+ */
+
+/**
+ * @file blr_cache.c - binlog router cache, manage the binlog cache
+ *
+ * The binlog router is designed to be used in replication environments to
+ * increase the replication fanout of a master server. It provides a transparant
+ * mechanism to read the binlog entries for multiple slaves while requiring
+ * only a single connection to the actual master to support the slaves.
+ *
+ * The current prototype implement is designed to support MySQL 5.6 and has
+ * a number of limitations. This prototype is merely a proof of concept and
+ * should not be considered production ready.
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 07/04/2014	Mark Riddoch		Initial implementation
+ *
+ * @endverbatim
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <service.h>
+#include <server.h>
+#include <router.h>
+#include <atomic.h>
+#include <spinlock.h>
+#include <blr.h>
+#include <dcb.h>
+#include <spinlock.h>
+
+#include <skygw_types.h>
+#include <skygw_utils.h>
+#include <log_manager.h>
+
+
+extern int lm_enabled_logfiles_bitmask;
+
+
+/**
+ * Initialise the cache for this instanceof the binlog router. As a side
+ * effect also determine the binlog file to read and the position to read
+ * from.
+ *
+ * @param	router		The router instance
+ */
+void
+blr_init_cache(ROUTER_INSTANCE *router)
+{
+}