Add support for sending game memory changes to outside processes

Source/Core/Core/MemoryWatcher.h

@@ -0,0 +1,39 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+#include <map>
+#include <thread>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+// MemoryWatcher reads a file containing in-game memory addresses and outputs
+// changes to those memory addresses to a unix domain socket as the game runs.
+//
+// The input file is a newline-separated list of hex memory addresses
+// (without the "0x"). The output to the socket is two words long, the first
+// containing the address, and the second containing the data as stored in
+// game memory.
+class MemoryWatcher final
+{
+public:
+	MemoryWatcher();
+	~MemoryWatcher();
+
+private:
+	bool LoadAddresses(const std::string& path);
+	bool OpenSocket(const std::string& path);
+	void WatcherThread();
+
+	std::thread m_watcher_thread;
+	std::atomic_bool m_running;
+
+	int m_fd;
+	sockaddr_un m_addr;
+
+	// Address -> last value
+	std::map<u32, u32> m_values;
+};