PPI: Allow to change the IOEvent handle/event mask

[senf.git] / PPI / IOEvent.hh

diff --git a/PPI/IOEvent.hh b/PPI/IOEvent.hh
index f750530..730b66b 100644 (file)
--- a/PPI/IOEvent.hh
+++ b/PPI/IOEvent.hh
@@ -1,8 +1,8 @@
 // $Id$
 //
-// Copyright (C) 2007 
-// Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
-// Kompetenzzentrum fuer Satelitenkommunikation (SatCom)
+// Copyright (C) 2007
+// Fraunhofer Institute for Open Communication Systems (FOKUS)
+// Competence Center NETwork research (NET), St. Augustin, GERMANY
 //     Stefan Bund <g0dil@berlios.de>
 //
 // This program is free software; you can redistribute it and/or modify
@@ -23,12 +23,13 @@
 /** \file
     \brief IOEvent public header */
 
-#ifndef HH_IOEvent_
-#define HH_IOEvent_ 1
+#ifndef HH_SENF_PPI_IOEvent_
+#define HH_SENF_PPI_IOEvent_ 1
 
 // Custom includes
-#include "Scheduler/Scheduler.hh"
+#include "../Scheduler/Scheduler.hh"
 #include "Events.hh"
+#include "../Utils/Exception.hh"
 
 //#include "IOEvent.mpp"
 ///////////////////////////////hh.p////////////////////////////////////////
@@ -52,7 +53,18 @@ namespace ppi {
         An IOEvent is signaled, whenever the FileHandle \a handle becomes readable or writable. The
         type of event is specified using the \a events mask with values from EventFlags.
 
-        \fixme Implement error/EOF handling
+        There are two types of flags:
+        
+        \li <em>Event flags</em> (\ref Read, \ref Prio, \ref Write) specify the type of event. The
+            callback will be called whenever one of the specified events occurs on the filehandle
+        \li <em>Error flags</em> (\ref Hup, \ref Err) specify some type of error condition on the
+            filehandle. If you specify an error flag when registering the event, the error condition
+            will be passed to the callback, otherwise an ErrorException or HangupException will be
+            thrown.
+
+        \see IOEventInfo
+
+        \ingroup event_group
       */
     class IOEvent
         : public EventImplementation<IOEventInfo>
@@ -61,29 +73,50 @@ namespace ppi {
         ///////////////////////////////////////////////////////////////////////////
         // Types
 
-        enum EventFlags { Read  = Scheduler::EV_READ, 
-                          Write = Scheduler::EV_WRITE };
+        // This is stupid, however there is no way to import the Scheduler::EventId enum together
+        // with the enumeration symbols
+
+        enum EventFlags { 
+              Read  = scheduler::FdEvent::EV_READ   /**< FileHandle is readable */
+            , Prio = scheduler::FdEvent::EV_PRIO    /**< FileHandle priority data is readable */
+            , Write = scheduler::FdEvent::EV_WRITE  /**< FileHandle is writable */
+            , Hup = scheduler::FdEvent::EV_HUP      /**< Hangup condition on FileHandle */
+            , Err = scheduler::FdEvent::EV_ERR      /**< Some other error condition on FileHandle */
+        };
 
         ///////////////////////////////////////////////////////////////////////////
         ///\name Structors and default members
         ///@{
 
+        IOEvent();
+
         template <class Handle>
         IOEvent(Handle handle, unsigned events);
 
         ///@}
         ///////////////////////////////////////////////////////////////////////////
 
+        template <class Handle>
+        void set(Handle handle, unsigned events);
+
+        /** \brief Unhandled error condition */
+        struct ErrorException : public senf::Exception
+        { ErrorException() : senf::Exception("senf::ppi::IOEvent::ErrorException"){} };
+
+        /** \brief Unhandled hangup condition */
+        struct HangupException : public senf::Exception
+        { HangupException() : senf::Exception("senf::ppi::IOEvent::HangupException"){} };
+
     protected:
 
     private:
         virtual void v_enable();
         virtual void v_disable();
         
-        void cb(int, Scheduler::EventId event);
+        void cb(int event);
 
         int fd_;
-        unsigned events_;
+        scheduler::FdEvent event_;
     };