SysSock2Select (FUN)

FUNCTION SysSock2Select : RTS_IEC_RESULT

Check a number of sockets for activity. All sockets added to the FD_SETs have to be of the same type (Standard or TLS)

InOut:

Scope	Name	Type	Comment
Return	SysSock2Select	RTS_IEC_RESULT	Runtime system error code (see CmpErrors.library): ERR_OK ERR_SOCK_TIMEDOUT, if timeout expired
Input	hSocket	RTS_IEC_HANDLE	Handle to one of the socket handles added to the FD Sets.
	diWidth	DINT	Number of sockets in the |SOCKET_FD_SET| structure, so |SOCKET_FD_SETSIZE| must be used here.
	pfdRead	POINTER TO SOCKET_FD_SET	Optional pointer to the structure |SOCKET_FD_SET| defining the socket set to be checked for reading. It is also possible to set this parameter to 0.
	pfdWrite	POINTER TO SOCKET_FD_SET	Optional pointer to the structure |SOCKET_FD_SET| defining the socket set to be checked for writing. It is also possible to set this parameter to 0.
	pfdExcept	POINTER TO SOCKET_FD_SET	Optional pointer to structure |SOCKET_FD_SET| that defines the socket set the error state has to be checked. It is also possible to set this parameter to 0.
	ptvTimeout	POINTER TO SOCKET_TIMEVAL	Pointer to maximum timespan which the function SysSockSelect waits for a response: ptvTimeout=NULL: Infinite wait ptvTimeout->tv_sec=-1, ptvTimeout->tv_usec=-1: Infinite wait ptvTimeout->tv_sec=0, ptvTimeout->tv_usec=0: No wait
	pdiReady	POINTER TO DINT	Number of sockets that are ready for IO