99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* \file ctrl_sock.h
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* \brief Control Socket for select() wakeup
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*
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* LWIP doesn't allow an easy mechanism to on-demand wakeup a thread
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* sleeping on select. This is a common requirement for sending
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* control commands to a network server. This control socket API
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* facilitates the same.
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*/
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#ifndef _CTRL_SOCK_H_
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#define _CTRL_SOCK_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Create a control socket
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*
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* LWIP doesn't allow an easy mechanism to on-demand wakeup a thread
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* sleeping on select. This is a common requirement for sending
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* control commands to a network server. This control socket API
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* facilitates the same.
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*
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* This API will create a UDP control socket on the specified port. It
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* will return a socket descriptor that can then be added to your
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* fd_set in select()
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*
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* @param[in] port the local port on which the control socket will listen
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*
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* @return - the socket descriptor that can be added to the fd_set in select.
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* - an error code if less than zero
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*/
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int cs_create_ctrl_sock(int port);
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/**
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* @brief Free the control socket
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*
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* This frees up the control socket that was earlier created using
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* cs_create_ctrl_sock()
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*
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* @param[in] fd the socket descriptor associated with this control socket
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*/
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void cs_free_ctrl_sock(int fd);
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/**
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* @brief Send data to control socket
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*
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* This API sends data to the control socket. If a server is blocked
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* on select() with the control socket, this call will wake up that
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* server.
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*
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* @param[in] send_fd the socket for sending ctrl messages
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* @param[in] port the port on which the control socket was created
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* @param[in] data pointer to a buffer that contains data to send on the socket
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* @param[in] data_len the length of the data contained in the buffer pointed to be data
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*
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* @return - the number of bytes sent to the control socket
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* - an error code if less than zero
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*/
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int cs_send_to_ctrl_sock(int send_fd, int port, void *data, unsigned int data_len);
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/**
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* @brief Receive data from control socket
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*
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* This API receives any data that was sent to the control
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* socket. This will be typically called from the server thread to
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* process any commands on this socket.
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*
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* @param[in] fd the socket descriptor of the control socket
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* @param[in] data pointer to a buffer that will be used to store
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* received from the control socket
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* @param[in] data_len the maximum length of the data that can be
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* stored in the buffer pointed by data
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*
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* @return - the number of bytes received from the control socket
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* - an error code if less than zero
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*/
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int cs_recv_from_ctrl_sock(int fd, void *data, unsigned int data_len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ! _CTRL_SOCK_H_ */
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