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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [FreeRTOS-uIP/] [psock.h] - Rev 649
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/* * Copyright (c) 2004, Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This file is part of the uIP TCP/IP stack * * Author: Adam Dunkels <adam@sics.se> * * $Id: psock.h 2 2011-07-17 20:13:17Z filepang@gmail.com $ */ /** * \defgroup psock Protosockets library * @{ * * The protosocket library provides an interface to the uIP stack that is * similar to the traditional BSD socket interface. Unlike programs * written for the ordinary uIP event-driven interface, programs * written with the protosocket library are executed in a sequential * fashion and does not have to be implemented as explicit state * machines. * * Protosockets only work with TCP connections. * * The protosocket library uses \ref pt protothreads to provide * sequential control flow. This makes the protosockets lightweight in * terms of memory, but also means that protosockets inherits the * functional limitations of protothreads. Each protosocket lives only * within a single function. Automatic variables (stack variables) are * not retained across a protosocket library function call. * * \note Because the protosocket library uses protothreads, local * variables will not always be saved across a call to a protosocket * library function. It is therefore advised that local variables are * used with extreme care. * * The protosocket library provides functions for sending data without * having to deal with retransmissions and acknowledgements, as well * as functions for reading data without having to deal with data * being split across more than one TCP segment. * * Because each protosocket runs as a protothread, the protosocket has to be * started with a call to PSOCK_BEGIN() at the start of the function * in which the protosocket is used. Similarly, the protosocket protothread can * be terminated by a call to PSOCK_EXIT(). * */ /** * \file * Protosocket library header file * \author * Adam Dunkels <adam@sics.se> * */ #ifndef __PSOCK_H__ #define __PSOCK_H__ #include "uipopt.h" #include "pt.h" /* * The structure that holds the state of a buffer. * * This structure holds the state of a uIP buffer. The structure has * no user-visible elements, but is used through the functions * provided by the library. * */ struct psock_buf { u8_t *ptr; unsigned short left; }; /** * The representation of a protosocket. * * The protosocket structrure is an opaque structure with no user-visible * elements. */ struct psock { struct pt pt, psockpt; /* Protothreads - one that's using the psock functions, and one that runs inside the psock functions. */ const u8_t *sendptr; /* Pointer to the next data to be sent. */ u8_t *readptr; /* Pointer to the next data to be read. */ char *bufptr; /* Pointer to the buffer used for buffering incoming data. */ u16_t sendlen; /* The number of bytes left to be sent. */ u16_t readlen; /* The number of bytes left to be read. */ struct psock_buf buf; /* The structure holding the state of the input buffer. */ unsigned int bufsize; /* The size of the input buffer. */ unsigned char state; /* The state of the protosocket. */ }; void psock_init(struct psock *psock, char *buffer, unsigned int buffersize); /** * Initialize a protosocket. * * This macro initializes a protosocket and must be called before the * protosocket is used. The initialization also specifies the input buffer * for the protosocket. * * \param psock (struct psock *) A pointer to the protosocket to be * initialized * * \param buffer (char *) A pointer to the input buffer for the * protosocket. * * \param buffersize (unsigned int) The size of the input buffer. * * \hideinitializer */ #define PSOCK_INIT(psock, buffer, buffersize) \ psock_init(psock, buffer, buffersize) /** * Start the protosocket protothread in a function. * * This macro starts the protothread associated with the protosocket and * must come before other protosocket calls in the function it is used. * * \param psock (struct psock *) A pointer to the protosocket to be * started. * * \hideinitializer */ #define PSOCK_BEGIN(psock) PT_BEGIN(&((psock)->pt)) PT_THREAD(psock_send(struct psock *psock, const char *buf, unsigned int len)); /** * Send data. * * This macro sends data over a protosocket. The protosocket protothread blocks * until all data has been sent and is known to have been received by * the remote end of the TCP connection. * * \param psock (struct psock *) A pointer to the protosocket over which * data is to be sent. * * \param data (char *) A pointer to the data that is to be sent. * * \param datalen (unsigned int) The length of the data that is to be * sent. * * \hideinitializer */ #define PSOCK_SEND(psock, data, datalen) \ PT_WAIT_THREAD(&((psock)->pt), psock_send(psock, data, datalen)) /** * \brief Send a null-terminated string. * \param psock Pointer to the protosocket. * \param str The string to be sent. * * This function sends a null-terminated string over the * protosocket. * * \hideinitializer */ #define PSOCK_SEND_STR(psock, str) \ PT_WAIT_THREAD(&((psock)->pt), psock_send(psock, str, strlen(str))) PT_THREAD(psock_generator_send(struct psock *psock, unsigned short (*f)(void *), void *arg)); /** * \brief Generate data with a function and send it * \param psock Pointer to the protosocket. * \param generator Pointer to the generator function * \param arg Argument to the generator function * * This function generates data and sends it over the * protosocket. This can be used to dynamically generate * data for a transmission, instead of generating the data * in a buffer beforehand. This function reduces the need for * buffer memory. The generator function is implemented by * the application, and a pointer to the function is given * as an argument with the call to PSOCK_GENERATOR_SEND(). * * The generator function should place the generated data * directly in the uip_appdata buffer, and return the * length of the generated data. The generator function is * called by the protosocket layer when the data first is * sent, and once for every retransmission that is needed. * * \hideinitializer */ #define PSOCK_GENERATOR_SEND(psock, generator, arg) \ PT_WAIT_THREAD(&((psock)->pt), \ psock_generator_send(psock, generator, arg)) /** * Close a protosocket. * * This macro closes a protosocket and can only be called from within the * protothread in which the protosocket lives. * * \param psock (struct psock *) A pointer to the protosocket that is to * be closed. * * \hideinitializer */ #define PSOCK_CLOSE(psock) uip_close() PT_THREAD(psock_readbuf(struct psock *psock)); /** * Read data until the buffer is full. * * This macro will block waiting for data and read the data into the * input buffer specified with the call to PSOCK_INIT(). Data is read * until the buffer is full.. * * \param psock (struct psock *) A pointer to the protosocket from which * data should be read. * * \hideinitializer */ #define PSOCK_READBUF(psock) \ PT_WAIT_THREAD(&((psock)->pt), psock_readbuf(psock)) PT_THREAD(psock_readto(struct psock *psock, unsigned char c)); /** * Read data up to a specified character. * * This macro will block waiting for data and read the data into the * input buffer specified with the call to PSOCK_INIT(). Data is only * read until the specifieed character appears in the data stream. * * \param psock (struct psock *) A pointer to the protosocket from which * data should be read. * * \param c (char) The character at which to stop reading. * * \hideinitializer */ #define PSOCK_READTO(psock, c) \ PT_WAIT_THREAD(&((psock)->pt), psock_readto(psock, c)) /** * The length of the data that was previously read. * * This macro returns the length of the data that was previously read * using PSOCK_READTO() or PSOCK_READ(). * * \param psock (struct psock *) A pointer to the protosocket holding the data. * * \hideinitializer */ #define PSOCK_DATALEN(psock) psock_datalen(psock) u16_t psock_datalen(struct psock *psock); /** * Exit the protosocket's protothread. * * This macro terminates the protothread of the protosocket and should * almost always be used in conjunction with PSOCK_CLOSE(). * * \sa PSOCK_CLOSE_EXIT() * * \param psock (struct psock *) A pointer to the protosocket. * * \hideinitializer */ #define PSOCK_EXIT(psock) PT_EXIT(&((psock)->pt)) /** * Close a protosocket and exit the protosocket's protothread. * * This macro closes a protosocket and exits the protosocket's protothread. * * \param psock (struct psock *) A pointer to the protosocket. * * \hideinitializer */ #define PSOCK_CLOSE_EXIT(psock) \ do { \ PSOCK_CLOSE(psock); \ PSOCK_EXIT(psock); \ } while(0) /** * Declare the end of a protosocket's protothread. * * This macro is used for declaring that the protosocket's protothread * ends. It must always be used together with a matching PSOCK_BEGIN() * macro. * * \param psock (struct psock *) A pointer to the protosocket. * * \hideinitializer */ #define PSOCK_END(psock) PT_END(&((psock)->pt)) char psock_newdata(struct psock *s); /** * Check if new data has arrived on a protosocket. * * This macro is used in conjunction with the PSOCK_WAIT_UNTIL() * macro to check if data has arrived on a protosocket. * * \param psock (struct psock *) A pointer to the protosocket. * * \hideinitializer */ #define PSOCK_NEWDATA(psock) psock_newdata(psock) /** * Wait until a condition is true. * * This macro blocks the protothread until the specified condition is * true. The macro PSOCK_NEWDATA() can be used to check if new data * arrives when the protosocket is waiting. * * Typically, this macro is used as follows: * \code PT_THREAD(thread(struct psock *s, struct timer *t)) { PSOCK_BEGIN(s); PSOCK_WAIT_UNTIL(s, PSOCK_NEWADATA(s) || timer_expired(t)); if(PSOCK_NEWDATA(s)) { PSOCK_READTO(s, '\n'); } else { handle_timed_out(s); } PSOCK_END(s); } \endcode * * \param psock (struct psock *) A pointer to the protosocket. * \param condition The condition to wait for. * * \hideinitializer */ #define PSOCK_WAIT_UNTIL(psock, condition) \ PT_WAIT_UNTIL(&((psock)->pt), (condition)); #define PSOCK_WAIT_THREAD(psock, condition) \ PT_WAIT_THREAD(&((psock)->pt), (condition)) #endif /* __PSOCK_H__ */ /** @} */
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