Populates the list of socket handles ready for reading.
function SelectReadList( var VSocketList: TIdSocketList; const ATimeout: Integer = IdTimeoutInfinite ): Boolean; override;
SelectReadList is an overridden Boolean function that implements the method used to populate the socket list in VSocketList with the socket handles ready for reading.
SelectReadList uses the Select() and fd_set() APIs for a protocol stack implementation to populate the socket handle list.
SelectReadList returns True when the socket list contains at least one socket handle available for reading.
SelectReadList converts the set of readable socket descriptors for storage in the TIdSocketList instance. If VSocketList is unassigned, a new TIdSocketListWindows instance is create for the converted values.
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