function SelectReadList( var VSocketList: TIdSocketList; const ATimeout: Integer = IdTimeoutInfinite ): Boolean; virtual; abstract;
SelectReadList is an abstract virtual Boolean function that specifies 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 must be implemented in a descendant class using the protocol stack and list implementation for a specific operating system or platform.
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