
Chapter 17. TCP/IP
405
Function #21 .fcFDISSET
Get socket identifier status from socket identifier set
Syntax: CALL "SOCKET.FN3" .fcFDISSET SOCKFD%, SOCKFDSET$,
FDISSET%
Description:
This function gets the status of the specified socket identifier in the
specified socket identifier set.
BSD4.4 socket API equivalent: This function is equivalent to the BSD4.4
socket API FD_ISSET macro.
Parameters: SOCKFD% Socket identifier
SOCKFDSET$ Socket identifier set
Return value: FDISSET% Socket identifier status
The socket identifier status (
FDISSET%) must be one of the following
values:
.soFDSet
0
No change
.soFDNoSet
1
Change in status
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