[server] allow access to file descriptors, so the user can handle multiple instances with a single poll

Author: Karl Herbig

include/modbuspp/server.h

@@ -18,6 +18,7 @@
 
 #include <modbuspp/master.h>
 #include <modbuspp/bufferedslave.h>
+#include <poll.h>
 
 namespace Modbus {
 
@@ -167,6 +168,9 @@ namespace Modbus {
        */
       virtual ~Server();
 
+
+      virtual std::vector<pollfd> fds();
+
       /**
        * @overload
        */

src/server.cpp

@@ -218,6 +218,12 @@ namespace Modbus {
     d->messageCB = cb;
   }
 
+  std::vector<pollfd> Server::fds() {
+      PIMP_D(Server);
+
+      return d->all_pollfds;
+  }
+
   // ---------------------------------------------------------------------------
   //
   //                         Server::Private Class