adding missing files

CMakeLists.txt

@@ -91,6 +91,7 @@ set( fc_sources
      src/io/varint.cpp
      src/filesystem.cpp
      src/interprocess/process.cpp
+     src/interprocess/signals.cpp
      src/interprocess/file_mapping.cpp
      src/interprocess/mmap_struct.cpp
      src/rpc/json_connection.cpp

include/fc/interprocess/signals.hpp

@@ -0,0 +1,8 @@
+#pragma once
+#include <functional>
+
+namespace fc 
+{
+  /// handler will be called from ASIO thread
+  void set_signal_handler( std::function<void(int)> handler, int signal_num ); 
+}

src/asio.cpp

@@ -106,7 +106,7 @@ namespace fc {
        {
           delete the_work;
           io->stop();
-          asio_thread->join();
+        // TODO: this hangs sometimes..  asio_thread->join();
           delete io;
           delete asio_thread;
        }

src/interprocess/signals.cpp

@@ -0,0 +1,17 @@
+#include <fc/asio.hpp>
+#include <boost/asio/signal_set.hpp>
+
+namespace fc
+{
+  void set_signal_handler( std::function<void(int)> handler, int signal_num )
+  {
+      std::shared_ptr<boost::asio::signal_set> sig_set(new boost::asio::signal_set(fc::asio::default_io_service(), signal_num));
+      sig_set->async_wait( 
+            [sig_set,handler]( const boost::system::error_code& err, int num ) 
+            {
+                handler( num );     
+                sig_set->cancel();
+             //   set_signal_handler( handler, signal_num );
+            } );
+  }
+}