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FreeRTOS_Sockets.c
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FreeRTOS_Sockets.c
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/*
* FreeRTOS+TCP V2.3.2
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* 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.
*
* http://aws.amazon.com/freertos
* http://www.FreeRTOS.org
*/
/**
* @file FreeRTOS_Sockets.c
* @brief Implements the Sockets API based on Berkeley sockets for the FreeRTOS+TCP network stack.
* Sockets are used by the application processes to interact with the IP-task which in turn
* interacts with the hardware.
*/
/* Standard includes. */
#include <stdint.h>
#include <stdio.h>
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"
/* FreeRTOS+TCP includes. */
#include "FreeRTOS_UDP_IP.h"
#include "FreeRTOS_IP.h"
#include "FreeRTOS_Sockets.h"
#include "FreeRTOS_IP_Private.h"
#include "FreeRTOS_DNS.h"
#include "NetworkBufferManagement.h"
/* The ItemValue of the sockets xBoundSocketListItem member holds the socket's
* port number. */
/** @brief Set the port number for the socket in the xBoundSocketListItem. */
#define socketSET_SOCKET_PORT( pxSocket, usPort ) listSET_LIST_ITEM_VALUE( ( &( ( pxSocket )->xBoundSocketListItem ) ), ( usPort ) )
/** @brief Get the port number for the socket in the xBoundSocketListItem. */
#define socketGET_SOCKET_PORT( pxSocket ) listGET_LIST_ITEM_VALUE( ( &( ( pxSocket )->xBoundSocketListItem ) ) )
/** @brief Test if a socket it bound which means it is either included in
* xBoundUDPSocketsList or xBoundTCPSocketsList
*/
#define socketSOCKET_IS_BOUND( pxSocket ) ( listLIST_ITEM_CONTAINER( &( pxSocket )->xBoundSocketListItem ) != NULL )
/** @brief If FreeRTOS_sendto() is called on a socket that is not bound to a port
* number then, depending on the FreeRTOSIPConfig.h settings, it might be
* that a port number is automatically generated for the socket.
* Automatically generated port numbers will be between
* socketAUTO_PORT_ALLOCATION_START_NUMBER and 0xffff.
*
* @note Per https://tools.ietf.org/html/rfc6056, "the dynamic ports consist of
* the range 49152-65535. However, ephemeral port selection algorithms should
* use the whole range 1024-65535" excluding those already in use (inbound
* or outbound).
*/
#if !defined( socketAUTO_PORT_ALLOCATION_START_NUMBER )
#define socketAUTO_PORT_ALLOCATION_START_NUMBER ( ( uint16_t ) 0x0400 )
#endif
/** @brief Maximum value of port number which can be auto assigned. */
#define socketAUTO_PORT_ALLOCATION_MAX_NUMBER ( ( uint16_t ) 0xffff )
/** @brief The number of octets that make up an IP address. */
#define socketMAX_IP_ADDRESS_OCTETS 4U
/** @brief A block time of 0 simply means "don't block". */
#define socketDONT_BLOCK ( ( TickType_t ) 0 )
/** @brief TCP timer period in milliseconds. */
#if ( ( ipconfigUSE_TCP == 1 ) && !defined( ipTCP_TIMER_PERIOD_MS ) )
#define ipTCP_TIMER_PERIOD_MS ( 1000U )
#endif
/* Some helper macro's for defining the 20/80 % limits of uxLittleSpace / uxEnoughSpace. */
#define sock20_PERCENT 20U /**< 20% of the defined limit. */
#define sock80_PERCENT 80U /**< 80% of the defined limit. */
#define sock100_PERCENT 100U /**< 100% of the defined limit. */
#if ( ipconfigUSE_CALLBACKS != 0 )
static portINLINE ipDECL_CAST_PTR_FUNC_FOR_TYPE( F_TCP_UDP_Handler_t )
{
return ( F_TCP_UDP_Handler_t * ) pvArgument;
}
/*-----------------------------------------------------------*/
static portINLINE ipDECL_CAST_CONST_PTR_FUNC_FOR_TYPE( F_TCP_UDP_Handler_t )
{
return ( const F_TCP_UDP_Handler_t * ) pvArgument;
}
/*-----------------------------------------------------------*/
#endif /* if ( ipconfigUSE_CALLBACKS != 0 ) */
/**
* @brief Utility function to cast pointer of a type to pointer of type NetworkBufferDescriptor_t.
*
* @return The casted pointer.
*/
static portINLINE ipDECL_CAST_PTR_FUNC_FOR_TYPE( NetworkBufferDescriptor_t )
{
return ( NetworkBufferDescriptor_t * ) pvArgument;
}
/*-----------------------------------------------------------*/
/**
* @brief Utility function to cast pointer of a type to pointer of type StreamBuffer_t.
*
* @return The casted pointer.
*/
static portINLINE ipDECL_CAST_PTR_FUNC_FOR_TYPE( StreamBuffer_t )
{
return ( StreamBuffer_t * ) pvArgument;
}
/*-----------------------------------------------------------*/
/*
* Allocate the next port number from the private allocation range.
* TCP and UDP each have their own series of port numbers
* ulProtocol is either ipPROTOCOL_UDP or ipPROTOCOL_TCP
*/
static uint16_t prvGetPrivatePortNumber( BaseType_t xProtocol );
/*
* Return the list item from within pxList that has an item value of
* xWantedItemValue. If there is no such list item return NULL.
*/
static const ListItem_t * pxListFindListItemWithValue( const List_t * pxList,
TickType_t xWantedItemValue );
/*
* Return pdTRUE only if pxSocket is valid and bound, as far as can be
* determined.
*/
static BaseType_t prvValidSocket( const FreeRTOS_Socket_t * pxSocket,
BaseType_t xProtocol,
BaseType_t xIsBound );
#if ( ipconfigUSE_TCP == 1 )
/*
* Internal function prvSockopt_so_buffer(): sets FREERTOS_SO_SNDBUF or
* FREERTOS_SO_RCVBUF properties of a socket.
*/
static BaseType_t prvSockopt_so_buffer( FreeRTOS_Socket_t * pxSocket,
int32_t lOptionName,
const void * pvOptionValue );
#endif /* ipconfigUSE_TCP == 1 */
/*
* Before creating a socket, check the validity of the parameters used
* and find the size of the socket space, which is different for UDP and TCP
*/
static BaseType_t prvDetermineSocketSize( BaseType_t xDomain,
BaseType_t xType,
BaseType_t xProtocol,
size_t * pxSocketSize );
#if ( ipconfigUSE_TCP == 1 )
/*
* Create a txStream or a rxStream, depending on the parameter 'xIsInputStream'
*/
static StreamBuffer_t * prvTCPCreateStream( FreeRTOS_Socket_t * pxSocket,
BaseType_t xIsInputStream );
#endif /* ipconfigUSE_TCP == 1 */
#if ( ipconfigUSE_TCP == 1 )
/*
* Called from FreeRTOS_send(): some checks which will be done before
* sending a TCP packed.
*/
static int32_t prvTCPSendCheck( FreeRTOS_Socket_t * pxSocket,
size_t uxDataLength );
#endif /* ipconfigUSE_TCP */
#if ( ipconfigUSE_TCP == 1 )
/*
* When a child socket gets closed, make sure to update the child-count of the parent
*/
static void prvTCPSetSocketCount( FreeRTOS_Socket_t const * pxSocketToDelete );
#endif /* ipconfigUSE_TCP == 1 */
#if ( ipconfigUSE_TCP == 1 )
/*
* Called from FreeRTOS_connect(): make some checks and if allowed, send a
* message to the IP-task to start connecting to a remote socket
*/
static BaseType_t prvTCPConnectStart( FreeRTOS_Socket_t * pxSocket,
struct freertos_sockaddr const * pxAddress );
#endif /* ipconfigUSE_TCP */
#if ( ipconfigUSE_TCP == 1 )
/*
* Check if it makes any sense to wait for a connect event.
* It may return: -EINPROGRESS, -EAGAIN, or 0 for OK.
*/
static BaseType_t bMayConnect( FreeRTOS_Socket_t const * pxSocket );
#endif /* ipconfigUSE_TCP */
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/* Executed by the IP-task, it will check all sockets belonging to a set */
static void prvFindSelectedSocket( SocketSelect_t * pxSocketSet );
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
/** @brief The list that contains mappings between sockets and port numbers.
* Accesses to this list must be protected by critical sections of
* some kind.
*/
List_t xBoundUDPSocketsList;
#if ipconfigUSE_TCP == 1
/** @brief The list that contains mappings between sockets and port numbers.
* Accesses to this list must be protected by critical sections of
* some kind.
*/
List_t xBoundTCPSocketsList;
#endif /* ipconfigUSE_TCP == 1 */
/*-----------------------------------------------------------*/
/**
* @brief Check whether the socket is valid or not.
*
* @param[in] pxSocket: The socket being checked.
* @param[in] xProtocol: The protocol for which the socket was created.
* @param[in] xIsBound: pdTRUE when the socket should be bound, otherwise pdFALSE.
*
* @return If the socket is valid, then pdPASS is returned or else, pdFAIL
* is returned.
*/
static BaseType_t prvValidSocket( const FreeRTOS_Socket_t * pxSocket,
BaseType_t xProtocol,
BaseType_t xIsBound )
{
BaseType_t xReturn;
if( ( pxSocket == NULL ) || ( pxSocket == FREERTOS_INVALID_SOCKET ) )
{
xReturn = pdFALSE;
}
else if( ( xIsBound != pdFALSE ) && !socketSOCKET_IS_BOUND( pxSocket ) )
{
/* The caller expects the socket to be bound, but it isn't. */
xReturn = pdFALSE;
}
else if( pxSocket->ucProtocol != ( uint8_t ) xProtocol )
{
/* Socket has a wrong type (UDP != TCP). */
xReturn = pdFALSE;
}
else
{
xReturn = pdTRUE;
}
return xReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief Initialise the bound TCP/UDP socket lists.
*/
void vNetworkSocketsInit( void )
{
vListInitialise( &xBoundUDPSocketsList );
#if ( ipconfigUSE_TCP == 1 )
{
vListInitialise( &xBoundTCPSocketsList );
}
#endif /* ipconfigUSE_TCP == 1 */
}
/*-----------------------------------------------------------*/
/**
* @brief Determine the socket size for the given protocol.
*
* @param[in] xDomain: The domain for which the size of socket is being determined.
* @param[in] xType: Is this a datagram socket or a stream socket.
* @param[in] xProtocol: The protocol being used.
* @param[out] pxSocketSize: Pointer to a variable in which the size shall be returned
* if all checks pass.
*
* @return pdPASS if socket size was determined and put in the parameter pxSocketSize
* correctly, else pdFAIL.
*/
static BaseType_t prvDetermineSocketSize( BaseType_t xDomain,
BaseType_t xType,
BaseType_t xProtocol,
size_t * pxSocketSize )
{
BaseType_t xReturn = pdPASS;
FreeRTOS_Socket_t const * pxSocket = NULL;
/* Asserts must not appear before it has been determined that the network
* task is ready - otherwise the asserts will fail. */
if( xIPIsNetworkTaskReady() == pdFALSE )
{
xReturn = pdFAIL;
}
else
{
/* Only Ethernet is currently supported. */
configASSERT( xDomain == FREERTOS_AF_INET );
/* Check if the UDP socket-list has been initialised. */
configASSERT( listLIST_IS_INITIALISED( &xBoundUDPSocketsList ) );
#if ( ipconfigUSE_TCP == 1 )
{
/* Check if the TCP socket-list has been initialised. */
configASSERT( listLIST_IS_INITIALISED( &xBoundTCPSocketsList ) );
}
#endif /* ipconfigUSE_TCP == 1 */
if( xProtocol == FREERTOS_IPPROTO_UDP )
{
if( xType != FREERTOS_SOCK_DGRAM )
{
xReturn = pdFAIL;
configASSERT( xReturn == pdPASS );
}
/* In case a UDP socket is created, do not allocate space for TCP data. */
*pxSocketSize = ( sizeof( *pxSocket ) - sizeof( pxSocket->u ) ) + sizeof( pxSocket->u.xUDP );
}
#if ( ipconfigUSE_TCP == 1 )
else if( xProtocol == FREERTOS_IPPROTO_TCP )
{
if( xType != FREERTOS_SOCK_STREAM )
{
xReturn = pdFAIL;
configASSERT( xReturn == pdPASS );
}
*pxSocketSize = ( sizeof( *pxSocket ) - sizeof( pxSocket->u ) ) + sizeof( pxSocket->u.xTCP );
}
#endif /* ipconfigUSE_TCP == 1 */
else
{
xReturn = pdFAIL;
configASSERT( xReturn == pdPASS );
}
}
/* In case configASSERT() is not used */
( void ) xDomain;
( void ) pxSocket; /* Was only used for sizeof. */
return xReturn;
}
/*-----------------------------------------------------------*/
/**
* @brief allocate and initialise a socket.
*
* @param[in] xDomain: The domain in which the socket should be created.
* @param[in] xType: The type of the socket.
* @param[in] xProtocol: The protocol of the socket.
*
* @return FREERTOS_INVALID_SOCKET if the allocation failed, or if there was
* a parameter error, otherwise a valid socket.
*/
Socket_t FreeRTOS_socket( BaseType_t xDomain,
BaseType_t xType,
BaseType_t xProtocol )
{
FreeRTOS_Socket_t * pxSocket;
/* Note that this value will be over-written by the call to prvDetermineSocketSize. */
size_t uxSocketSize = 1;
EventGroupHandle_t xEventGroup;
Socket_t xReturn;
if( prvDetermineSocketSize( xDomain, xType, xProtocol, &uxSocketSize ) == pdFAIL )
{
xReturn = FREERTOS_INVALID_SOCKET;
}
else
{
/* Allocate the structure that will hold the socket information. The
* size depends on the type of socket: UDP sockets need less space. A
* define 'pvPortMallocSocket' will used to allocate the necessary space.
* By default it points to the FreeRTOS function 'pvPortMalloc()'. */
pxSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, pvPortMallocSocket( uxSocketSize ) );
if( pxSocket == NULL )
{
xReturn = FREERTOS_INVALID_SOCKET;
iptraceFAILED_TO_CREATE_SOCKET();
}
else
{
xEventGroup = xEventGroupCreate();
if( xEventGroup == NULL )
{
vPortFreeSocket( pxSocket );
xReturn = FREERTOS_INVALID_SOCKET;
iptraceFAILED_TO_CREATE_EVENT_GROUP();
}
else
{
if( xProtocol == FREERTOS_IPPROTO_UDP )
{
iptraceMEM_STATS_CREATE( tcpSOCKET_UDP, pxSocket, uxSocketSize + sizeof( StaticEventGroup_t ) );
}
else
{
/* Lint wants at least a comment, in case the macro is empty. */
iptraceMEM_STATS_CREATE( tcpSOCKET_TCP, pxSocket, uxSocketSize + sizeof( StaticEventGroup_t ) );
}
/* Clear the entire space to avoid nulling individual entries. */
( void ) memset( pxSocket, 0, uxSocketSize );
pxSocket->xEventGroup = xEventGroup;
/* Initialise the socket's members. The semaphore will be created
* if the socket is bound to an address, for now the pointer to the
* semaphore is just set to NULL to show it has not been created. */
if( xProtocol == FREERTOS_IPPROTO_UDP )
{
vListInitialise( &( pxSocket->u.xUDP.xWaitingPacketsList ) );
#if ( ipconfigUDP_MAX_RX_PACKETS > 0U )
{
pxSocket->u.xUDP.uxMaxPackets = ( UBaseType_t ) ipconfigUDP_MAX_RX_PACKETS;
}
#endif /* ipconfigUDP_MAX_RX_PACKETS > 0 */
}
vListInitialiseItem( &( pxSocket->xBoundSocketListItem ) );
listSET_LIST_ITEM_OWNER( &( pxSocket->xBoundSocketListItem ), ipPOINTER_CAST( void *, pxSocket ) );
pxSocket->xReceiveBlockTime = ipconfigSOCK_DEFAULT_RECEIVE_BLOCK_TIME;
pxSocket->xSendBlockTime = ipconfigSOCK_DEFAULT_SEND_BLOCK_TIME;
pxSocket->ucSocketOptions = ( uint8_t ) FREERTOS_SO_UDPCKSUM_OUT;
pxSocket->ucProtocol = ( uint8_t ) xProtocol; /* protocol: UDP or TCP */
#if ( ipconfigUSE_TCP == 1 )
{
if( xProtocol == FREERTOS_IPPROTO_TCP )
{
/* StreamSize is expressed in number of bytes */
/* Round up buffer sizes to nearest multiple of MSS */
pxSocket->u.xTCP.usCurMSS = ( uint16_t ) ipconfigTCP_MSS;
pxSocket->u.xTCP.usInitMSS = ( uint16_t ) ipconfigTCP_MSS;
pxSocket->u.xTCP.uxRxStreamSize = ( size_t ) ipconfigTCP_RX_BUFFER_LENGTH;
pxSocket->u.xTCP.uxTxStreamSize = ( size_t ) FreeRTOS_round_up( ipconfigTCP_TX_BUFFER_LENGTH, ipconfigTCP_MSS );
/* Use half of the buffer size of the TCP windows */
#if ( ipconfigUSE_TCP_WIN == 1 )
{
pxSocket->u.xTCP.uxRxWinSize = FreeRTOS_max_uint32( 1UL, ( uint32_t ) ( pxSocket->u.xTCP.uxRxStreamSize / 2U ) / ipconfigTCP_MSS );
pxSocket->u.xTCP.uxTxWinSize = FreeRTOS_max_uint32( 1UL, ( uint32_t ) ( pxSocket->u.xTCP.uxTxStreamSize / 2U ) / ipconfigTCP_MSS );
}
#else
{
pxSocket->u.xTCP.uxRxWinSize = 1U;
pxSocket->u.xTCP.uxTxWinSize = 1U;
}
#endif
/* The above values are just defaults, and can be overridden by
* calling FreeRTOS_setsockopt(). No buffers will be allocated until a
* socket is connected and data is exchanged. */
}
}
#endif /* ipconfigUSE_TCP == 1 */
xReturn = pxSocket;
}
}
}
/* Remove compiler warnings in the case the configASSERT() is not defined. */
( void ) xDomain;
return xReturn;
}
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Create a socket set.
*
* @return The new socket set which was created, or NULL when allocation has failed.
*/
SocketSet_t FreeRTOS_CreateSocketSet( void )
{
SocketSelect_t * pxSocketSet;
pxSocketSet = ipCAST_PTR_TO_TYPE_PTR( SocketSelect_t, pvPortMalloc( sizeof( *pxSocketSet ) ) );
if( pxSocketSet != NULL )
{
( void ) memset( pxSocketSet, 0, sizeof( *pxSocketSet ) );
pxSocketSet->xSelectGroup = xEventGroupCreate();
if( pxSocketSet->xSelectGroup == NULL )
{
vPortFree( pxSocketSet );
pxSocketSet = NULL;
}
else
{
/* Lint wants at least a comment, in case the macro is empty. */
iptraceMEM_STATS_CREATE( tcpSOCKET_SET, pxSocketSet, sizeof( *pxSocketSet ) + sizeof( StaticEventGroup_t ) );
}
}
return ( SocketSet_t ) pxSocketSet;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Delete a given socket set.
*
* @param[in] xSocketSet: The socket set being deleted.
*/
void FreeRTOS_DeleteSocketSet( SocketSet_t xSocketSet )
{
SocketSelect_t * pxSocketSet = ( SocketSelect_t * ) xSocketSet;
iptraceMEM_STATS_DELETE( pxSocketSet );
vEventGroupDelete( pxSocketSet->xSelectGroup );
vPortFree( pxSocketSet );
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Add a socket to a set.
*
* @param[in] xSocket: The socket being added.
* @param[in] xSocketSet: The socket set being added to.
* @param[in] xBitsToSet: The event bits to set, a combination of the values defined
* in 'eSelectEvent_t', for read, write, exception, etc.
*/
void FreeRTOS_FD_SET( Socket_t xSocket,
SocketSet_t xSocketSet,
EventBits_t xBitsToSet )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
SocketSelect_t * pxSocketSet = ( SocketSelect_t * ) xSocketSet;
configASSERT( pxSocket != NULL );
configASSERT( xSocketSet != NULL );
/* Make sure we're not adding bits which are reserved for internal use,
* such as eSELECT_CALL_IP */
pxSocket->xSelectBits |= xBitsToSet & ( ( EventBits_t ) eSELECT_ALL );
if( ( pxSocket->xSelectBits & ( ( EventBits_t ) eSELECT_ALL ) ) != ( EventBits_t ) 0U )
{
/* Adding a socket to a socket set. */
pxSocket->pxSocketSet = ( SocketSelect_t * ) xSocketSet;
/* Now have the IP-task call vSocketSelect() to see if the set contains
* any sockets which are 'ready' and set the proper bits. */
prvFindSelectedSocket( pxSocketSet );
}
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Clear select bits for a socket. If the mask becomes 0,
* remove the socket from the set.
*
* @param[in] xSocket: The socket whose select bits are being cleared.
* @param[in] xSocketSet: The socket set of the socket.
* @param[in] xBitsToClear: The bits to be cleared. Every '1' means that the
* corresponding bit will be cleared. See 'eSelectEvent_t' for
* the possible values.
*/
void FreeRTOS_FD_CLR( Socket_t xSocket,
SocketSet_t xSocketSet,
EventBits_t xBitsToClear )
{
FreeRTOS_Socket_t * pxSocket = ( FreeRTOS_Socket_t * ) xSocket;
configASSERT( pxSocket != NULL );
configASSERT( xSocketSet != NULL );
pxSocket->xSelectBits &= ~( xBitsToClear & ( ( EventBits_t ) eSELECT_ALL ) );
if( ( pxSocket->xSelectBits & ( ( EventBits_t ) eSELECT_ALL ) ) != ( EventBits_t ) 0U )
{
pxSocket->pxSocketSet = ( SocketSelect_t * ) xSocketSet;
}
else
{
/* disconnect it from the socket set */
pxSocket->pxSocketSet = NULL;
}
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Test if a socket belongs to a socket-set and if so, which event bit(s)
* are set.
*
* @param[in] xSocket: The socket of interest.
* @param[in] xSocketSet: The socket set to which the socket belongs.
*
* @return If the socket belongs to the socket set: the event bits, otherwise zero.
*/
EventBits_t FreeRTOS_FD_ISSET( Socket_t xSocket,
SocketSet_t xSocketSet )
{
EventBits_t xReturn;
const FreeRTOS_Socket_t * pxSocket = ( const FreeRTOS_Socket_t * ) xSocket;
configASSERT( pxSocket != NULL );
configASSERT( xSocketSet != NULL );
if( xSocketSet == ( SocketSet_t ) pxSocket->pxSocketSet )
{
/* Make sure we're not adding bits which are reserved for internal
* use. */
xReturn = pxSocket->xSocketBits & ( ( EventBits_t ) eSELECT_ALL );
}
else
{
xReturn = 0;
}
return xReturn;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief The select() statement: wait for an event to occur on any of the sockets
* included in a socket set.
*
* @param[in] xSocketSet: The socket set including the sockets on which we are
* waiting for an event to occur.
* @param[in] xBlockTimeTicks: Maximum time ticks to wait for an event to occur.
* If the value is 'portMAX_DELAY' then the function will wait
* indefinitely for an event to occur.
*
* @return The socket which might have triggered the event bit.
*/
BaseType_t FreeRTOS_select( SocketSet_t xSocketSet,
TickType_t xBlockTimeTicks )
{
TimeOut_t xTimeOut;
TickType_t xRemainingTime;
SocketSelect_t * pxSocketSet = ( SocketSelect_t * ) xSocketSet;
EventBits_t uxResult;
configASSERT( xSocketSet != NULL );
/* Only in the first round, check for non-blocking */
xRemainingTime = xBlockTimeTicks;
/* Fetch the current time */
vTaskSetTimeOutState( &xTimeOut );
for( ; ; )
{
/* Find a socket which might have triggered the bit
* This function might return immediately or block for a limited time */
uxResult = xEventGroupWaitBits( pxSocketSet->xSelectGroup, ( ( EventBits_t ) eSELECT_ALL ), pdFALSE, pdFALSE, xRemainingTime );
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
if( ( uxResult & ( ( EventBits_t ) eSELECT_INTR ) ) != 0U )
{
( void ) xEventGroupClearBits( pxSocketSet->xSelectGroup, ( EventBits_t ) eSELECT_INTR );
FreeRTOS_debug_printf( ( "FreeRTOS_select: interrupted\n" ) );
break;
}
}
#endif /* ipconfigSUPPORT_SIGNALS */
/* Have the IP-task find the socket which had an event */
prvFindSelectedSocket( pxSocketSet );
uxResult = xEventGroupGetBits( pxSocketSet->xSelectGroup );
if( uxResult != 0U )
{
break;
}
/* Has the timeout been reached? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
break;
}
}
return ( BaseType_t ) uxResult;
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION */
/*-----------------------------------------------------------*/
#if ( ipconfigSUPPORT_SELECT_FUNCTION == 1 )
/**
* @brief Send a message to the IP-task to have it check all sockets belonging to
* 'pxSocketSet'
*
* @param[in] pxSocketSet: The socket set being asked to check.
*/
static void prvFindSelectedSocket( SocketSelect_t * pxSocketSet )
{
IPStackEvent_t xSelectEvent;
#if ( ipconfigSELECT_USES_NOTIFY != 0 )
SocketSelectMessage_t xSelectMessage;
#endif
xSelectEvent.eEventType = eSocketSelectEvent;
#if ( ipconfigSELECT_USES_NOTIFY != 0 )
{
xSelectMessage.pxSocketSet = pxSocketSet;
xSelectMessage.xTaskhandle = xTaskGetCurrentTaskHandle();
xSelectEvent.pvData = &( xSelectMessage );
}
#else
{
xSelectEvent.pvData = pxSocketSet;
/* while the IP-task works on the request, the API will block on
* 'eSELECT_CALL_IP'. So clear it first. */
( void ) xEventGroupClearBits( pxSocketSet->xSelectGroup, ( BaseType_t ) eSELECT_CALL_IP );
}
#endif /* if ( ipconfigSELECT_USES_NOTIFY != 0 ) */
/* Now send the socket select event */
if( xSendEventStructToIPTask( &xSelectEvent, ( TickType_t ) portMAX_DELAY ) == pdFAIL )
{
/* Oops, we failed to wake-up the IP task. No use to wait for it. */
FreeRTOS_debug_printf( ( "prvFindSelectedSocket: failed\n" ) );
}
else
{
/* As soon as the IP-task is ready, it will set 'eSELECT_CALL_IP' to
* wakeup the calling API */
#if ( ipconfigSELECT_USES_NOTIFY != 0 )
{
( void ) ulTaskNotifyTake( pdFALSE, portMAX_DELAY );
}
#else
{
( void ) xEventGroupWaitBits( pxSocketSet->xSelectGroup, ( BaseType_t ) eSELECT_CALL_IP, pdTRUE, pdFALSE, portMAX_DELAY );
}
#endif
}
}
#endif /* ipconfigSUPPORT_SELECT_FUNCTION == 1 */
/*-----------------------------------------------------------*/
/**
* @brief Receive data from a bound socket. In this library, the function
* can only be used with connection-less sockets (UDP). For TCP sockets,
* please use FreeRTOS_recv().
*
* @param[in] xSocket: The socket to which the data is sent i.e. the
* listening socket.
* @param[out] pvBuffer: The buffer in which the data being received is to
* be stored.
* @param[in] uxBufferLength: The length of the buffer.
* @param[in] xFlags: The flags to indicate preferences while calling this function.
* @param[out] pxSourceAddress: The source address from which the data is being sent.
* @param[out] pxSourceAddressLength: This parameter is used only to adhere to Berkeley
* sockets standard. It is not used internally.
*
* @return The number of bytes received. Or else, an error code is returned. When it
* returns a negative value, the cause can be looked-up in
* 'FreeRTOS_errno_TCP.h'.
*/
int32_t FreeRTOS_recvfrom( Socket_t xSocket,
void * pvBuffer,
size_t uxBufferLength,
BaseType_t xFlags,
struct freertos_sockaddr * pxSourceAddress,
socklen_t * pxSourceAddressLength )
{
BaseType_t lPacketCount;
NetworkBufferDescriptor_t * pxNetworkBuffer;
const void * pvCopySource;
FreeRTOS_Socket_t const * pxSocket = xSocket;
TickType_t xRemainingTime = ( TickType_t ) 0; /* Obsolete assignment, but some compilers output a warning if its not done. */
BaseType_t xTimed = pdFALSE;
TimeOut_t xTimeOut;
int32_t lReturn;
EventBits_t xEventBits = ( EventBits_t ) 0;
size_t uxPayloadLength;
if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_UDP, pdTRUE ) == pdFALSE )
{
lReturn = -pdFREERTOS_ERRNO_EINVAL;
}
else
{
lPacketCount = ( BaseType_t ) listCURRENT_LIST_LENGTH( &( pxSocket->u.xUDP.xWaitingPacketsList ) );
/* The function prototype is designed to maintain the expected Berkeley
* sockets standard, but this implementation does not use all the parameters. */
( void ) pxSourceAddressLength;
while( lPacketCount == 0 )
{
if( xTimed == pdFALSE )
{
/* Check to see if the socket is non blocking on the first
* iteration. */
xRemainingTime = pxSocket->xReceiveBlockTime;
if( xRemainingTime == ( TickType_t ) 0 )
{
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
/* Just check for the interrupt flag. */
xEventBits = xEventGroupWaitBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_INTR,
pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, socketDONT_BLOCK );
}
#endif /* ipconfigSUPPORT_SIGNALS */
break;
}
if( ( ( ( UBaseType_t ) xFlags ) & ( ( UBaseType_t ) FREERTOS_MSG_DONTWAIT ) ) != 0U )
{
break;
}
/* To ensure this part only executes once. */
xTimed = pdTRUE;
/* Fetch the current time. */
vTaskSetTimeOutState( &xTimeOut );
}
/* Wait for arrival of data. While waiting, the IP-task may set the
* 'eSOCKET_RECEIVE' bit in 'xEventGroup', if it receives data for this
* socket, thus unblocking this API call. */
xEventBits = xEventGroupWaitBits( pxSocket->xEventGroup, ( ( EventBits_t ) eSOCKET_RECEIVE ) | ( ( EventBits_t ) eSOCKET_INTR ),
pdTRUE /*xClearOnExit*/, pdFALSE /*xWaitAllBits*/, xRemainingTime );
#if ( ipconfigSUPPORT_SIGNALS != 0 )
{
if( ( xEventBits & ( EventBits_t ) eSOCKET_INTR ) != 0U )
{
if( ( xEventBits & ( EventBits_t ) eSOCKET_RECEIVE ) != 0U )
{
/* Shouldn't have cleared the eSOCKET_RECEIVE flag. */
( void ) xEventGroupSetBits( pxSocket->xEventGroup, ( EventBits_t ) eSOCKET_RECEIVE );
}
break;
}
}
#else /* if ( ipconfigSUPPORT_SIGNALS != 0 ) */
{
( void ) xEventBits;
}
#endif /* ipconfigSUPPORT_SIGNALS */
lPacketCount = ( BaseType_t ) listCURRENT_LIST_LENGTH( &( pxSocket->u.xUDP.xWaitingPacketsList ) );
if( lPacketCount != 0 )
{
break;
}
/* Has the timeout been reached ? */
if( xTaskCheckForTimeOut( &xTimeOut, &xRemainingTime ) != pdFALSE )
{
break;
}
} /* while( lPacketCount == 0 ) */
if( lPacketCount != 0 )
{
taskENTER_CRITICAL();
{
/* The owner of the list item is the network buffer. */
pxNetworkBuffer = ipCAST_PTR_TO_TYPE_PTR( NetworkBufferDescriptor_t, listGET_OWNER_OF_HEAD_ENTRY( &( pxSocket->u.xUDP.xWaitingPacketsList ) ) );
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_MSG_PEEK ) == 0U )
{
/* Remove the network buffer from the list of buffers waiting to
* be processed by the socket. */
( void ) uxListRemove( &( pxNetworkBuffer->xBufferListItem ) );
}
}
taskEXIT_CRITICAL();
/* The returned value is the length of the payload data, which is
* calculated at the total packet size minus the headers.
* The validity of `xDataLength` prvProcessIPPacket has been confirmed
* in 'prvProcessIPPacket()'. */
uxPayloadLength = pxNetworkBuffer->xDataLength - sizeof( UDPPacket_t );
lReturn = ( int32_t ) uxPayloadLength;
if( pxSourceAddress != NULL )
{
pxSourceAddress->sin_port = pxNetworkBuffer->usPort;
pxSourceAddress->sin_addr = pxNetworkBuffer->ulIPAddress;
}
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_ZERO_COPY ) == 0U )
{
/* The zero copy flag is not set. Truncate the length if it won't
* fit in the provided buffer. */
if( lReturn > ( int32_t ) uxBufferLength )
{
iptraceRECVFROM_DISCARDING_BYTES( ( uxBufferLength - lReturn ) );
lReturn = ( int32_t ) uxBufferLength;
}
/* Copy the received data into the provided buffer, then release the
* network buffer. */
pvCopySource = ( const void * ) &pxNetworkBuffer->pucEthernetBuffer[ ipUDP_PAYLOAD_OFFSET_IPv4 ];
( void ) memcpy( pvBuffer, pvCopySource, ( size_t ) lReturn );
if( ( ( UBaseType_t ) xFlags & ( UBaseType_t ) FREERTOS_MSG_PEEK ) == 0U )
{
vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
}
}
else
{
/* The zero copy flag was set. pvBuffer is not a buffer into which
* the received data can be copied, but a pointer that must be set to
* point to the buffer in which the received data has already been
* placed. */
*( ( void ** ) pvBuffer ) = ipPOINTER_CAST( void *, &( pxNetworkBuffer->pucEthernetBuffer[ ipUDP_PAYLOAD_OFFSET_IPv4 ] ) );
}
}
#if ( ipconfigSUPPORT_SIGNALS != 0 )
else if( ( xEventBits & ( EventBits_t ) eSOCKET_INTR ) != 0U )
{
lReturn = -pdFREERTOS_ERRNO_EINTR;
iptraceRECVFROM_INTERRUPTED();
}
#endif /* ipconfigSUPPORT_SIGNALS */
else
{
lReturn = -pdFREERTOS_ERRNO_EWOULDBLOCK;
iptraceRECVFROM_TIMEOUT();