xianhe/include/libwebsockets/lws-ws-state.h

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

/** \defgroup wsstatus Websocket status APIs
 * ##Websocket connection status APIs
 *
 * These provide information about ws connection or message status
 */
///@{
/**
 * lws_send_pipe_choked() - tests if socket is writable or not
 * \param wsi: lws connection
 *
 * Allows you to check if you can write more on the socket
 */
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_send_pipe_choked(struct lws *wsi);

/**
 * lws_is_final_fragment() - tests if last part of ws message
 *
 * \param wsi: lws connection
 */
LWS_VISIBLE LWS_EXTERN int
lws_is_final_fragment(struct lws *wsi);

/**
 * lws_is_first_fragment() - tests if first part of ws message
 *
 * \param wsi: lws connection
 */
LWS_VISIBLE LWS_EXTERN int
lws_is_first_fragment(struct lws *wsi);

/**
 * lws_get_reserved_bits() - access reserved bits of ws frame
 * \param wsi: lws connection
 */
LWS_VISIBLE LWS_EXTERN unsigned char
lws_get_reserved_bits(struct lws *wsi);

/**
 * lws_partial_buffered() - find out if lws buffered the last write
 * \param wsi:	websocket connection to check
 *
 * Returns 1 if you cannot use lws_write because the last
 * write on this connection is still buffered, and can't be cleared without
 * returning to the service loop and waiting for the connection to be
 * writeable again.
 *
 * If you will try to do >1 lws_write call inside a single
 * WRITEABLE callback, you must check this after every write and bail if
 * set, ask for a new writeable callback and continue writing from there.
 *
 * This is never set at the start of a writeable callback, but any write
 * may set it.
 */
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_partial_buffered(struct lws *wsi);

/**
 * lws_frame_is_binary(): true if the current frame was sent in binary mode
 *
 * \param wsi: the connection we are inquiring about
 *
 * This is intended to be called from the LWS_CALLBACK_RECEIVE callback if
 * it's interested to see if the frame it's dealing with was sent in binary
 * mode.
 */
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_frame_is_binary(struct lws *wsi);
///@}