EVENT_ERROR = 2
};
-class InspIRCd;
-class Module;
+/**
+ * Event mask for SocketEngine events
+ */
+enum EventMask
+{
+ /** Do not test this socket for readability
+ */
+ FD_WANT_NO_READ = 0x1,
+ /** Give a read event at all times when reads will not block.
+ */
+ FD_WANT_POLL_READ = 0x2,
+ /** Give a read event when there is new data to read.
+ *
+ * An event MUST be sent if there is new data to be read, and the most
+ * recent read/recv() on this FD returned EAGAIN. An event MAY be sent
+ * at any time there is data to be read on the socket.
+ */
+ FD_WANT_FAST_READ = 0x4,
+ /** Give an optional read event when reads begin to unblock
+ *
+ * This state is useful if you want to leave data in the OS receive
+ * queue but not get continuous event notifications about it, because
+ * it may not require a system call to transition from FD_WANT_FAST_READ
+ */
+ FD_WANT_EDGE_READ = 0x8,
+
+ /** Mask for all read events */
+ FD_WANT_READ_MASK = 0x0F,
+
+ /** Do not test this socket for writeability
+ */
+ FD_WANT_NO_WRITE = 0x10,
+ /** Give a write event at all times when writes will not block.
+ *
+ * You probably shouldn't use this state; if it's likely that the write
+ * will not block, try it first, then use FD_WANT_FAST_WRITE if it
+ * fails. If it's likely to block (or you are using polling-style reads)
+ * then use FD_WANT_SINGLE_WRITE.
+ */
+ FD_WANT_POLL_WRITE = 0x20,
+ /** Give a write event when writes don't block any more
+ *
+ * An event MUST be sent if writes will not block, and the most recent
+ * write/send() on this FD returned EAGAIN, or connect() returned
+ * EINPROGRESS. An event MAY be sent at any time that writes will not
+ * block.
+ *
+ * Before calling HandleEvent, a socket engine MAY change the state of
+ * the FD back to FD_WANT_EDGE_WRITE if it is simpler (for example, if a
+ * one-shot notification was registered). If further writes are needed,
+ * it is the responsibility of the event handler to change the state to
+ * one that will generate the required notifications
+ */
+ FD_WANT_FAST_WRITE = 0x40,
+ /** Give an optional write event on edge-triggered write unblock.
+ *
+ * This state is useful to avoid system calls when moving to/from
+ * FD_WANT_FAST_WRITE when writing data to a mostly-unblocked socket.
+ */
+ FD_WANT_EDGE_WRITE = 0x80,
+ /** Request a one-shot poll-style write notification. The socket will
+ * return to the FD_WANT_NO_WRITE state before HandleEvent is called.
+ */
+ FD_WANT_SINGLE_WRITE = 0x100,
+
+ /** Mask for all write events */
+ FD_WANT_WRITE_MASK = 0x1F0,
+
+ /** Add a trial read. During the next DispatchEvents invocation, this
+ * will call HandleEvent with EVENT_READ unless reads are known to be
+ * blocking.
+ */
+ FD_ADD_TRIAL_READ = 0x1000,
+ /** Assert that reads are known to block. This cancels FD_ADD_TRIAL_READ.
+ * Reset by SE before running EVENT_READ
+ */
+ FD_READ_WILL_BLOCK = 0x2000,
+
+ /** Add a trial write. During the next DispatchEvents invocation, this
+ * will call HandleEvent with EVENT_WRITE unless writes are known to be
+ * blocking.
+ *
+ * This could be used to group several writes together into a single
+ * send() syscall, or to ensure that writes are blocking when attempting
+ * to use FD_WANT_FAST_WRITE.
+ */
+ FD_ADD_TRIAL_WRITE = 0x4000,
+ /** Assert that writes are known to block. This cancels FD_ADD_TRIAL_WRITE.
+ * Reset by SE before running EVENT_WRITE
+ */
+ FD_WRITE_WILL_BLOCK = 0x8000,
+
+ /** Mask for trial read/trial write */
+ FD_TRIAL_NOTE_MASK = 0x5000
+};
/** This class is a basic I/O handler class.
* Any object which wishes to receive basic I/O events
* must have a file descriptor. What this file descriptor
* is actually attached to is completely up to you.
*/
-class CoreExport EventHandler : public Extensible
+class CoreExport EventHandler : public classbase
{
+ private:
+ /** Private state maintained by socket engine */
+ int event_mask;
protected:
/** File descriptor.
- * All events which can be handled
- * must have a file descriptor.
- * This allows you to add events for
- * sockets, fifo's, pipes, and various
- * other forms of IPC.
+ * All events which can be handled must have a file descriptor. This
+ * allows you to add events for sockets, fifo's, pipes, and various
+ * other forms of IPC. Do not change this while the object is
+ * registered with the SocketEngine
*/
int fd;
public:
*/
inline int GetFd() const { return fd; }
+ inline int GetEventMask() const { return event_mask; }
+
/** Set a new file desciptor
- * @param FD The new file descriptor. Do not
- * call this method without first deleting the
- * object from the SocketEngine if you have
+ * @param FD The new file descriptor. Do not call this method without
+ * first deleting the object from the SocketEngine if you have
* added it to a SocketEngine instance.
*/
void SetFd(int FD);
* and EVENT_WRITE for write events.
*/
virtual void HandleEvent(EventType et, int errornum = 0) = 0;
+
+ friend class SocketEngine;
};
/** Provides basic file-descriptor-based I/O support.
*/
class CoreExport SocketEngine
{
-protected:
- /** Handle to socket engine, where needed.
- */
- int EngineHandle;
+ protected:
/** Current number of descriptors in the engine
*/
int CurrentSetSize;
/** Reference table, contains all current handlers
*/
EventHandler** ref;
+ /** List of handlers that want a trial read/write
+ */
+ std::set<int> trials;
int MAX_DESCRIPTORS;
time_t lastempty;
void UpdateStats(size_t len_in, size_t len_out);
+
+ virtual void OnSetEvent(EventHandler* eh, int old_mask, int new_mask) = 0;
+ void SetEventMask(EventHandler* eh, int value);
public:
double TotalEvents;
* must provide an object derived from EventHandler which implements
* HandleEvent().
* @param eh An event handling object to add
- * @param writeFirst Wait for a write event instead of a read
+ * @param event_mask The initial event mask for the object
*/
- virtual bool AddFd(EventHandler* eh, bool writeFirst = false) = 0;
+ virtual bool AddFd(EventHandler* eh, int event_mask) = 0;
/** If you call this function and pass it an
* event handler, that event handler will
* 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.
+ * @param eh The event handler to change
+ * @param event_mask The changes to make to the wait state
*/
- virtual void WantWrite(EventHandler* eh) = 0;
+ void ChangeEventMask(EventHandler* eh, int event_mask);
- /** Returns the maximum number of file descriptors
- * you may store in the socket engine at any one time.
+ /** Returns the highest file descriptor you may store in the socket engine
* @return The maximum fd value
*/
- virtual int GetMaxFds();
+ inline int GetMaxFds() const { return MAX_DESCRIPTORS; }
- /** Returns the number of file descriptor slots
- * which are available for storing fds.
- * @return The number of remaining fd's
+ /** Returns the number of file descriptors being queried
+ * @return The set size
*/
- virtual int GetRemainingFds();
+ inline int GetUsedFds() const { return CurrentSetSize; }
/** Delete an event handler from the engine.
* This function call deletes an EventHandler
*/
virtual EventHandler* GetRef(int fd);
- /** Waits for events and dispatches them to handlers.
- * Please note that this doesnt wait long, only
- * a couple of milliseconds. It returns the number of
- * events which occured during this call.
- * This method will dispatch events to their handlers
- * by calling their EventHandler::HandleEvent()
- * methods with the neccessary EventType value.
+ /** Waits for events and dispatches them to handlers. Please note that
+ * this doesn't wait long, only a couple of milliseconds. It returns the
+ * number of events which occurred during this call. This method will
+ * dispatch events to their handlers by calling their
+ * EventHandler::HandleEvent() methods with the necessary EventType
+ * value.
* @return The number of events which have occured.
*/
- virtual int DispatchEvents();
+ virtual int DispatchEvents() = 0;
+
+ /** Dispatch trial reads and writes. This causes the actual socket I/O
+ * to happen when writes have been pre-buffered.
+ */
+ virtual void DispatchTrialWrites();
- /** Returns the socket engines name.
- * This returns the name of the engine for use
- * in /VERSION responses.
+ /** Returns the socket engines name. This returns the name of the
+ * engine for use in /VERSION responses.
* @return The socket engine name
*/
virtual std::string GetName() = 0;
- /** Returns true if the file descriptors in the
- * given event handler are within sensible ranges
- * which can be handled by the socket engine.
+ /** Returns true if the file descriptors in the given event handler are
+ * within sensible ranges which can be handled by the socket engine.
*/
virtual bool BoundsCheckFd(EventHandler* eh);
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Accept(EventHandler* fd, sockaddr *addr, socklen_t *addrlen);
+ int Accept(EventHandler* fd, sockaddr *addr, socklen_t *addrlen);
/** Abstraction for BSD sockets close(2).
* This function should emulate its namesake system call exactly.
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Close(EventHandler* fd);
+ int Close(EventHandler* fd);
/** Abstraction for BSD sockets close(2).
* This function should emulate its namesake system call exactly.
* This function should emulate its namesake system call exactly.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Close(int fd);
+ int Close(int fd);
/** Abstraction for BSD sockets send(2).
* This function should emulate its namesake system call exactly.
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Send(EventHandler* fd, const void *buf, size_t len, int flags);
+ int Send(EventHandler* fd, const void *buf, size_t len, int flags);
/** Abstraction for BSD sockets recv(2).
* This function should emulate its namesake system call exactly.
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Recv(EventHandler* fd, void *buf, size_t len, int flags);
+ int Recv(EventHandler* fd, void *buf, size_t len, int flags);
/** Abstraction for BSD sockets recvfrom(2).
* This function should emulate its namesake system call exactly.
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int RecvFrom(EventHandler* fd, void *buf, size_t len, int flags, sockaddr *from, socklen_t *fromlen);
+ int RecvFrom(EventHandler* fd, void *buf, size_t len, int flags, sockaddr *from, socklen_t *fromlen);
/** Abstraction for BSD sockets sendto(2).
* This function should emulate its namesake system call exactly.
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int SendTo(EventHandler* fd, const void *buf, size_t len, int flags, const sockaddr *to, socklen_t tolen);
+ int SendTo(EventHandler* fd, const void *buf, size_t len, int flags, const sockaddr *to, socklen_t tolen);
/** Abstraction for BSD sockets connect(2).
* This function should emulate its namesake system call exactly.
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Connect(EventHandler* fd, const sockaddr *serv_addr, socklen_t addrlen);
+ int Connect(EventHandler* fd, const sockaddr *serv_addr, socklen_t addrlen);
/** Make a file descriptor blocking.
* @param fd a file descriptor to set to blocking mode
* @return 0 on success, -1 on failure, errno is set appropriately.
*/
- virtual int Blocking(int fd);
+ int Blocking(int fd);
/** Make a file descriptor nonblocking.
* @param fd A file descriptor to set to nonblocking mode
* @return 0 on success, -1 on failure, errno is set appropriately.
*/
- virtual int NonBlocking(int fd);
+ int NonBlocking(int fd);
/** Abstraction for BSD sockets shutdown(2).
* This function should emulate its namesake system call exactly.
* @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Shutdown(EventHandler* fd, int how);
+ int Shutdown(EventHandler* fd, int how);
/** Abstraction for BSD sockets shutdown(2).
* This function should emulate its namesake system call exactly.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Shutdown(int fd, int how);
+ int Shutdown(int fd, int how);
/** Abstraction for BSD sockets bind(2).
* This function should emulate its namesake system call exactly.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Bind(int fd, const sockaddr *my_addr, socklen_t addrlen);
+ int Bind(int fd, const sockaddr *my_addr, socklen_t addrlen);
/** Abstraction for BSD sockets listen(2).
* This function should emulate its namesake system call exactly.
* @return This method should return exactly the same values as the system call it emulates.
*/
- virtual int Listen(int sockfd, int backlog);
+ int Listen(int sockfd, int backlog);
- /** Abstraction for BSD sockets getsockname(2).
- * This function should emulate its namesake system call exactly.
- * @param fd This version of the call takes an EventHandler instead of a bare file descriptor.
- * @return This method should return exactly the same values as the system call it emulates.
+ /** Set SO_REUSEADDR and SO_LINGER on this file descriptor
*/
- virtual int GetSockName(EventHandler* fd, sockaddr *name, socklen_t* namelen);
+ void SetReuse(int sockfd);
/** This function is called immediately after fork().
* Some socket engines (notably kqueue) cannot have their
void GetStats(float &kbitpersec_in, float &kbitpersec_out, float &kbitpersec_total);
};
+SocketEngine* CreateSocketEngine();
+
#endif