| #ifndef __dispatch_user_fd_h__ |
| #define __dispatch_user_fd_h__ 1 |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #include <qpid/dispatch/dispatch.h> |
| #include <qpid/dispatch/server.h> |
| |
| /**@file |
| * Server User-File-Descriptor functions. |
| * |
| * @defgroup user_fd user_fd |
| * |
| * Server User-File-Descriptor Functions |
| * @{ |
| */ |
| |
| typedef struct qd_user_fd_t qd_user_fd_t; |
| |
| |
| /** |
| * User_fd Handler |
| * |
| * Callback invoked when a user-managed file descriptor is available for reading or writing or there |
| * was an error on the file descriptor. |
| * |
| * @param context The handler context supplied in the qd_user_fd call. |
| * @param ufd The user_fd handle for the processable fd. |
| */ |
| typedef void (*qd_user_fd_handler_cb_t)(void* context, qd_user_fd_t *ufd); |
| |
| |
| /** |
| * Set the user-fd handler callback for the server. This handler is optional, but must be supplied |
| * if the qd_server is used to manage the activation of user file descriptors. |
| */ |
| void qd_server_set_user_fd_handler(qd_dispatch_t *qd, qd_user_fd_handler_cb_t ufd_handler); |
| |
| |
| /** |
| * Create a tracker for a user-managed file descriptor. |
| * |
| * A user-fd is appropriate for use when the application opens and manages file descriptors |
| * for purposes other than AMQP communication. Registering a user fd with the dispatch server |
| * controls processing of the FD alongside the FDs used for messaging. |
| * |
| * @param qd Pointer to the dispatch instance. |
| * @param fd The open file descriptor being managed by the application. |
| * @param context User context passed back in the connection handler. |
| * @return A pointer to the new user_fd. |
| */ |
| qd_user_fd_t *qd_user_fd(qd_dispatch_t *qd, int fd, void *context); |
| |
| |
| /** |
| * Free the resources for a user-managed FD tracker. |
| * |
| * @param ufd Structure pointer returned by qd_user_fd. |
| */ |
| void qd_user_fd_free(qd_user_fd_t *ufd); |
| |
| |
| /** |
| * Activate a user-fd for read. |
| * |
| * Use this activation when the application has capacity to receive data from the user-fd. This will |
| * cause the callback set in qd_server_set_user_fd_handler to later be invoked when the |
| * file descriptor has data to read. |
| * |
| * @param ufd Structure pointer returned by qd_user_fd. |
| */ |
| void qd_user_fd_activate_read(qd_user_fd_t *ufd); |
| |
| |
| /** |
| * Activate a user-fd for write. |
| * |
| * Use this activation when the application has data to write via the user-fd. This will |
| * cause the callback set in qd_server_set_user_fd_handler to later be invoked when the |
| * file descriptor is writable. |
| * |
| * @param ufd Structure pointer returned by qd_user_fd. |
| */ |
| void qd_user_fd_activate_write(qd_user_fd_t *ufd); |
| |
| |
| /** |
| * Check readable status of a user-fd |
| * |
| * Note: It is possible that readable status is spurious (i.e. this function returns true |
| * but the file-descriptor is not readable and will block if not set to O_NONBLOCK). |
| * Code accordingly. |
| * |
| * @param ufd Structure pointer returned by qd_user_fd. |
| * @return true iff the user file descriptor is readable. |
| */ |
| bool qd_user_fd_is_readable(qd_user_fd_t *ufd); |
| |
| |
| /** |
| * Check writable status of a user-fd |
| * |
| * @param ufd Structure pointer returned by qd_user_fd. |
| * @return true iff the user file descriptor is writable. |
| */ |
| bool qd_user_fd_is_writeable(qd_user_fd_t *ufd); |
| |
| /** |
| * @} |
| */ |
| |
| #endif |