+ 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.
+ */
+ virtual bool BoundsCheckFd(EventHandler* eh);
+
+ /** Abstraction for BSD sockets accept(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.
+ * @param addr The client IP address and port
+ * @param addrlen The size of the sockaddr parameter.
+ * @return This method should return exactly the same values as the system call it emulates.
+ */
+ 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.
+ */
+ 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.
+ */
+ 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.
+ * @param buf The buffer in which the data that is sent is stored.
+ * @param len The size of the buffer.
+ * @param flags A flag value that controls the sending of the data.
+ * @return This method should return exactly the same values as the system call it emulates.
+ */
+ 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.
+ * @param buf The buffer in which the data that is read is stored.
+ * @param len The size of the buffer.
+ * @param flags A flag value that controls the reception of the data.
+ * @return This method should return exactly the same values as the system call it emulates.
+ */
+ 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.
+ * @param buf The buffer in which the data that is read is stored.
+ * @param len The size of the buffer.
+ * @param flags A flag value that controls the reception of the data.
+ * @param from The remote IP address and port.
+ * @param fromlen The size of the from parameter.
+ * @return This method should return exactly the same values as the system call it emulates.
+ */
+ 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.
+ * @param buf The buffer in which the data that is sent is stored.
+ * @param len The size of the buffer.
+ * @param flags A flag value that controls the sending of the data.
+ * @param to The remote IP address and port.
+ * @param tolen The size of the to parameter.
+ * @return This method should return exactly the same values as the system call it emulates.
+ */
+ 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.
+ * @param serv_addr The server IP address and port.
+ * @param addrlen The size of the sockaddr parameter.
+ * @return This method should return exactly the same values as the system call it emulates.
+ */
+ 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.
+ */
+ 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.
+ */
+ 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.
+ * @param how What part of the socket to shut down
+ * @return This method should return exactly the same values as the system call it emulates.
+ */
+ int Shutdown(EventHandler* fd, int how);