Added support for user defined return codes in signal_handler.

Author: StefanoLusardiTC

sdk/include/teiacare/sdk/signal_handler.hpp

@@ -29,7 +29,7 @@ void install_signal_handlers(std::function<void(const char*, int)> callback = {}
  *
  * This function blocks until either an OS signal is rised or tc::sdk::quit() is called from another thread.
  */
-void wait_for_quit();
+int wait_for_quit();
 
 /*!
  * \brief Unlock the thread that is waiting on tc::sdk::wait_for_quit()

sdk/src/signal_handler.cpp

@@ -14,16 +14,20 @@
 
 #include <teiacare/sdk/signal_handler.hpp>
 
+#include <atomic>
 #include <csignal>
 #include <semaphore>
 
 namespace tc::sdk
 {
 static std::function<void(const char*, int)> signal_callback;
 static std::binary_semaphore sync(0);
+static std::atomic<int> return_code(0);
 
 void quit(const char* message, int signal)
 {
+    return_code = signal;
+
     if (signal_callback)
     {
         signal_callback(message, signal);
@@ -35,9 +39,10 @@ void quit(const char* message, int signal)
     // std::call_once(signal_flag, quit, message, signal);
 }
 
-void wait_for_quit()
+int wait_for_quit()
 {
     sync.acquire();
+    return return_code.load();
 }
 
 void signal_handler(int signal)