404 lines
13 KiB
C
404 lines
13 KiB
C
/*
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* Copyright (c) 2004, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/**
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* \addtogroup uip
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* @{
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*/
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/**
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* \defgroup psock Protosockets library
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* @{
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*
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* The protosocket library provides an interface to the uIP stack that is
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* similar to the traditional BSD socket interface. Unlike programs
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* written for the ordinary uIP event-driven interface, programs
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* written with the protosocket library are executed in a sequential
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* fashion and does not have to be implemented as explicit state
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* machines.
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*
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* Protosockets only work with TCP connections.
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*
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* The protosocket library uses \ref pt protothreads to provide
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* sequential control flow. This makes the protosockets lightweight in
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* terms of memory, but also means that protosockets inherits the
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* functional limitations of protothreads. Each protosocket lives only
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* within a single function block. Automatic variables (stack
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* variables) are not necessarily retained across a protosocket
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* library function call.
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*
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* \note Because the protosocket library uses protothreads, local variables
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* will not always be saved across a call to a protosocket library
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* function. It is therefore advised that local variables are used
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* with extreme care.
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*
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* The protosocket library provides functions for sending data without
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* having to deal with retransmissions and acknowledgements, as well
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* as functions for reading data without having to deal with data
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* being split across more than one TCP segment.
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*
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* Because each protosocket runs as a protothread, the protosocket has to be
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* started with a call to PSOCK_BEGIN() at the start of the function
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* in which the protosocket is used. Similarly, the protosocket protothread can
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* be terminated by a call to PSOCK_EXIT().
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*
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*/
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/**
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* \file
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* Protosocket library header file
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* \author
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* Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef PSOCK_H_
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#define PSOCK_H_
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#include "contiki.h"
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#include "contiki-lib.h"
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#include "contiki-net.h"
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/*
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* The structure that holds the state of a buffer.
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*
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* This structure holds the state of a uIP buffer. The structure has
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* no user-visible elements, but is used through the functions
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* provided by the library.
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*
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*/
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struct psock_buf {
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uint8_t *ptr;
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unsigned short left;
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};
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/**
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* The representation of a protosocket.
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*
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* The protosocket structrure is an opaque structure with no user-visible
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* elements.
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*/
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struct psock {
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struct pt pt, psockpt; /* Protothreads - one that's using the psock
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functions, and one that runs inside the
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psock functions. */
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const uint8_t *sendptr; /* Pointer to the next data to be sent. */
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uint8_t *readptr; /* Pointer to the next data to be read. */
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uint8_t *bufptr; /* Pointer to the buffer used for buffering
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incoming data. */
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uint16_t sendlen; /* The number of bytes left to be sent. */
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uint16_t readlen; /* The number of bytes left to be read. */
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struct psock_buf buf; /* The structure holding the state of the
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input buffer. */
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unsigned int bufsize; /* The size of the input buffer. */
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unsigned char state; /* The state of the protosocket. */
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};
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void psock_init(struct psock *psock, uint8_t *buffer, unsigned int buffersize);
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/**
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* Initialize a protosocket.
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*
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* This macro initializes a protosocket and must be called before the
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* protosocket is used. The initialization also specifies the input buffer
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* for the protosocket.
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*
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* \param psock (struct psock *) A pointer to the protosocket to be
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* initialized
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*
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* \param buffer (uint8_t *) A pointer to the input buffer for the
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* protosocket.
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*
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* \param buffersize (unsigned int) The size of the input buffer.
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*
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* \hideinitializer
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*/
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#define PSOCK_INIT(psock, buffer, buffersize) \
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psock_init(psock, buffer, buffersize)
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/**
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* Start the protosocket protothread in a function.
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*
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* This macro starts the protothread associated with the protosocket and
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* must come before other protosocket calls in the function it is used.
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*
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* \param psock (struct psock *) A pointer to the protosocket to be
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* started.
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*
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* \hideinitializer
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*/
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#define PSOCK_BEGIN(psock) PT_BEGIN(&((psock)->pt))
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PT_THREAD(psock_send(struct psock *psock, const uint8_t *buf, unsigned int len));
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/**
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* Send data.
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*
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* This macro sends data over a protosocket. The protosocket protothread blocks
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* until all data has been sent and is known to have been received by
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* the remote end of the TCP connection.
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*
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* \param psock (struct psock *) A pointer to the protosocket over which
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* data is to be sent.
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*
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* \param data (uint8_t *) A pointer to the data that is to be sent.
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*
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* \param datalen (unsigned int) The length of the data that is to be
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* sent.
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*
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* \hideinitializer
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*/
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#define PSOCK_SEND(psock, data, datalen) \
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PT_WAIT_THREAD(&((psock)->pt), psock_send(psock, data, datalen))
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/**
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* \brief Send a null-terminated string.
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* \param psock Pointer to the protosocket.
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* \param str The string to be sent.
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*
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* This function sends a null-terminated string over the
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* protosocket.
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*
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* \hideinitializer
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*/
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#define PSOCK_SEND_STR(psock, str) \
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PT_WAIT_THREAD(&((psock)->pt), psock_send(psock, (uint8_t *)str, strlen(str)))
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PT_THREAD(psock_generator_send(struct psock *psock,
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unsigned short (*f)(void *), void *arg));
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/**
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* \brief Generate data with a function and send it
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* \param psock Pointer to the protosocket.
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* \param generator Pointer to the generator function
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* \param arg Argument to the generator function
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*
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* This function generates data and sends it over the
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* protosocket. This can be used to dynamically generate
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* data for a transmission, instead of generating the data
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* in a buffer beforehand. This function reduces the need for
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* buffer memory. The generator function is implemented by
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* the application, and a pointer to the function is given
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* as an argument with the call to PSOCK_GENERATOR_SEND().
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*
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* The generator function should place the generated data
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* directly in the uip_appdata buffer, and return the
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* length of the generated data. The generator function is
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* called by the protosocket layer when the data first is
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* sent, and once for every retransmission that is needed.
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*
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* \hideinitializer
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*/
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#define PSOCK_GENERATOR_SEND(psock, generator, arg) \
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PT_WAIT_THREAD(&((psock)->pt), \
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psock_generator_send(psock, generator, arg))
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/**
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* Close a protosocket.
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*
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* This macro closes a protosocket and can only be called from within the
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* protothread in which the protosocket lives.
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*
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* \param psock (struct psock *) A pointer to the protosocket that is to
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* be closed.
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*
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* \hideinitializer
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*/
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#define PSOCK_CLOSE(psock) uip_close()
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PT_THREAD(psock_readbuf_len(struct psock *psock, uint16_t len));
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/**
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* Read data until the buffer is full.
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*
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* This macro will block waiting for data and read the data into the
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* input buffer specified with the call to PSOCK_INIT(). Data is read
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* until the buffer is full..
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*
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* \param psock (struct psock *) A pointer to the protosocket from which
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* data should be read.
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*
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* \hideinitializer
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*/
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#define PSOCK_READBUF(psock) \
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PT_WAIT_THREAD(&((psock)->pt), psock_readbuf_len(psock, 1))
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/**
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* Read data until at least len bytes have been read.
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*
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* This macro will block waiting for data and read the data into the
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* input buffer specified with the call to PSOCK_INIT(). Data is read
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* until the buffer is full or len bytes have been read.
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*
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* \param psock (struct psock *) A pointer to the protosocket from which
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* data should be read.
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* \param len (uint16_t) The minimum number of bytes to read.
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*
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* \hideinitializer
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*/
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#define PSOCK_READBUF_LEN(psock, len) \
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PT_WAIT_THREAD(&((psock)->pt), psock_readbuf_len(psock, len))
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PT_THREAD(psock_readto(struct psock *psock, unsigned char c));
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/**
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* Read data up to a specified character.
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*
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* This macro will block waiting for data and read the data into the
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* input buffer specified with the call to PSOCK_INIT(). Data is only
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* read until the specified character appears in the data stream.
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*
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* \param psock (struct psock *) A pointer to the protosocket from which
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* data should be read.
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*
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* \param c (char) The character at which to stop reading.
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*
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* \hideinitializer
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*/
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#define PSOCK_READTO(psock, c) \
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PT_WAIT_THREAD(&((psock)->pt), psock_readto(psock, c))
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/**
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* The length of the data that was previously read.
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*
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* This macro returns the length of the data that was previously read
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* using PSOCK_READTO() or PSOCK_READ().
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*
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* \param psock (struct psock *) A pointer to the protosocket holding the data.
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*
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* \hideinitializer
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*/
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#define PSOCK_DATALEN(psock) psock_datalen(psock)
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uint16_t psock_datalen(struct psock *psock);
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/**
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* Exit the protosocket's protothread.
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*
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* This macro terminates the protothread of the protosocket and should
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* almost always be used in conjunction with PSOCK_CLOSE().
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*
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* \sa PSOCK_CLOSE_EXIT()
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*
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* \param psock (struct psock *) A pointer to the protosocket.
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*
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* \hideinitializer
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*/
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#define PSOCK_EXIT(psock) PT_EXIT(&((psock)->pt))
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/**
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* Close a protosocket and exit the protosocket's protothread.
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*
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* This macro closes a protosocket and exits the protosocket's protothread.
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*
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* \param psock (struct psock *) A pointer to the protosocket.
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*
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* \hideinitializer
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*/
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#define PSOCK_CLOSE_EXIT(psock) \
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do { \
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PSOCK_CLOSE(psock); \
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PSOCK_EXIT(psock); \
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} while(0)
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/**
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* Declare the end of a protosocket's protothread.
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*
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* This macro is used for declaring that the protosocket's protothread
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* ends. It must always be used together with a matching PSOCK_BEGIN()
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* macro.
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*
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* \param psock (struct psock *) A pointer to the protosocket.
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*
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* \hideinitializer
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*/
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#define PSOCK_END(psock) PT_END(&((psock)->pt))
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char psock_newdata(struct psock *s);
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/**
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* Check if new data has arrived on a protosocket.
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*
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* This macro is used in conjunction with the PSOCK_WAIT_UNTIL()
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* macro to check if data has arrived on a protosocket.
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*
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* \param psock (struct psock *) A pointer to the protosocket.
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*
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* \hideinitializer
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*/
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#define PSOCK_NEWDATA(psock) psock_newdata(psock)
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/**
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* Wait until a condition is true.
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*
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* This macro blocks the protothread until the specified condition is
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* true. The macro PSOCK_NEWDATA() can be used to check if new data
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* arrives when the protosocket is waiting.
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*
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* Typically, this macro is used as follows:
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*
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\code
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PT_THREAD(thread(struct psock *s, struct timer *t))
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{
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PSOCK_BEGIN(s);
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PSOCK_WAIT_UNTIL(s, PSOCK_NEWDATA(s) || timer_expired(t));
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if(PSOCK_NEWDATA(s)) {
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PSOCK_READTO(s, '\n');
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} else {
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handle_timed_out(s);
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}
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PSOCK_END(s);
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}
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\endcode
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*
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* \param psock (struct psock *) A pointer to the protosocket.
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* \param condition The condition to wait for.
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*
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* \hideinitializer
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*/
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#define PSOCK_WAIT_UNTIL(psock, condition) \
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PT_WAIT_UNTIL(&((psock)->pt), (condition));
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#define PSOCK_WAIT_THREAD(psock, condition) \
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PT_WAIT_THREAD(&((psock)->pt), (condition))
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#endif /* PSOCK_H_ */
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/** @} */
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/** @} */
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