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FreeRTOS_FD_SET() [FreeRTOS+TCP API Reference] FreeRTOS_sockets.h void FreeRTOS_FD_SET( Socket_t xSocket, SocketSet_t xSocketSet, BaseType_t xSelectBits ); Add a socket to a socket set, and set the event bits of interest for the added socket. A socket can only be a member of one set at any time. ipconfigSUPPORT_SELECT_FUNCTION must be set to 1 in FreeRTOSIPConfig.h for FreeRTOS_FD_SET() to be available. Socket Sets allow an application RTOS task to block on multiple sockets simultaneously. To use a socket set: Create a socket set by calling FreeRTOS_CreateSocketSet(). A socket set is equivalent to the Berkeley sockets fd_set type. Add one or more sockets to the set using calls to FreeRTOS_FD_SET(). FreeRTOS_FD_SET() is equivalent to the Berkeley sockets FD_SET() macro. Call FreeRTOS_Select() to test the sockets in the set to see if any of the sockets have an event pending. If FreeRTOS_select() returns a non-zero value then check all sockets in the set using a call to FreeRTOS_FD_ISSET() to determine which events are pending. The event bits of interest are set using the xSelectBits parameter, which can take a bitwise OR combination of one or more of the following values: eSELECT_READ For a socket that is reading data, the eSELECT_READ event will be pending in a socket as long as the socket contains unread data. For a socket that is listening for new connections, the eSELECT_READ event will be pended each time a new connection is received. eSELECT_WRITE The eSELECT_WRITE event will remain pending as long as the socket has space for writing. If a TCP socket is actively connecting to a pear the eSELECT_WRITE event will be triggered as soon as the connection is established. One the eSELECT_WRITE event has been pended it should either be disabled, or the caller should write enough data to the socket so as to completely fill up the transmit buffer - otherwise the pending eSELECT_WRITE event will not be cleared. eSELECT_EXCEPT The eSELECT_EXCEPT event will become pending if the socket gets disconnected. The FreeRTOS_FD_CLR() API function is used to clear event bits or remove a socket from a socket set. Parameters: xSocket   The socket being added to the set. xSocketSet   The socket set to which the socket is being added. xSelectBits   The events that will cause the socket to unblock a call to FreeRTOS_select(). See the table above for valid values. Returns: void. Example usage: See the example on the FreeRTOS_select() documentation page. [ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ FreeRTOS Labs Sitemap ]    [ Main FreeRTOS Sitemap ]    [ ] Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.