/** Types of event an EventHandler may receive.
* EVENT_READ is a readable file descriptor,
* and EVENT_WRITE is a writeable file descriptor.
+ * EVENT_ERROR can always occur, and indicates
+ * a write error or read error on the socket,
+ * e.g. EOF condition or broken pipe.
*/
enum EventType
{
EVENT_READ = 0,
- EVENT_WRITE = 1
+ EVENT_WRITE = 1,
+ EVENT_ERROR = 2
};
class InspIRCd;
* is still added to a SocketEngine instance!
* If this function is unimplemented, the base class
* will return true.
+ *
+ * NOTE: You cannot set both Readable() and
+ * Writeable() to true. If you wish to receive
+ * a write event for your object, you must call
+ * SocketEngine::WantWrite() instead. This will
+ * trigger your objects next EVENT_WRITE type event.
*/
virtual bool Readable();
* is still added to a SocketEngine instance!
* If this function is unimplemented, the base class
* will return false.
+ *
+ * NOTE: You cannot set both Readable() and
+ * Writeable() to true. If you wish to receive
+ * a write event for your object, you must call
+ * SocketEngine::WantWrite() instead. This will
+ * trigger your objects next EVENT_WRITE type event.
*/
virtual bool Writeable();
* You MUST implement this function in your derived
* class, and it will be called whenever read or write
* events are received, depending on what your functions
- * Readable() and Writeable() returns.
+ * Readable() and Writeable() returns and wether you
+ * previously made a call to SocketEngine::WantWrite().
* @param et either one of EVENT_READ for read events,
* and EVENT_WRITE for write events.
*/
- virtual void HandleEvent(EventType et) = 0;
+ virtual void HandleEvent(EventType et, int errornum = 0) = 0;
};
/** Provides basic file-descriptor-based I/O support.
*/
virtual bool AddFd(EventHandler* eh);
+ /** If you call this function and pass it an
+ * event handler, that event handler will
+ * receive the next available write event,
+ * even if the socket is a readable socket only.
+ * Developers should avoid constantly keeping
+ * an eventhandler in the writeable state,
+ * as this will consume large amounts of
+ * CPU time.
+ * @param eh An event handler which wants to
+ * receive the next writeability event.
+ */
virtual void WantWrite(EventHandler* eh);
/** Returns the maximum number of file descriptors