Stream and File Handling

• ref-iou-sfh-sob: Stream Objects
• ref-iou-sfh-est: Exceptions related to Streams
• ref-iou-sfh-sem: Suppressing Error Messages
• ref-iou-sfh-opn: Opening a Stream
• ref-iou-sfh-cis: Finding the Current Input Stream
• ref-iou-sfh-cos: Finding the current output stream
• ref-iou-sfh-bos: Backtracking through Open Streams
• ref-iou-sfh-cst: Closing a Stream
• ref-iou-sfh-flu: Flushing Output

The operations implemented are opening, closing, querying status, flushing, error handling, setting.

The predicates in the "see" and "tell" families are supplied for DEC-10 Prolog compatibility. They take either file specifications or stream objects as arguments (see mpg-ref) and they specify an alternative, less powerful, mechanism for dealing with files and streams than the similar predicates (open/[3,4], etc.), which take stream objects (see the figure "Categorization of Stream Handling Predicates").