add tracer header for ptrace watchpoint functionality

src/tracer.hpp

@@ -0,0 +1,16 @@
+#ifndef GWATCH_TRACER_HPP
+#define GWATCH_TRACER_HPP
+
+#include <cstdint>
+#include <string>
+
+class Tracer {
+public:
+  void watch_variable(const std::string &exec_path, uint64_t address, size_t size);
+
+private:
+  void setup_hardware_watchpoint(pid_t pid, uint64_t address, size_t size);
+  void handle_watchpoint_hit(pid_t pid, uint64_t address);
+};
+
+#endif