Asynchronous Terminals and Printer Processes Programming Manual

SECTION 6
PROCEDURE CALLS FOR ACCESSING PRINTERS
This section contains descriptions of the procedure calls that
control printer I/O and some examples of how to use the calls.
PROCEDURE CALLS SUMMARY
The following GUARDIAN 90 file-system procedures perform I/O
operations with serial printers:
AWAITIO waits for completion of an outstanding I/O
operation pending on an open file.
CANCELREQ cancels the oldest outstanding operation,
optionally identified by a tag, on an open file.
CLOSE stops access to an open file.
CONTROL is used for form control and modem connect and
disconnect. See Appendix C for a summary of
CONTROL operations.
CONTROLBUF is used to load the DAVFU for the model 5520
printer. See Appendix C for a summary of
CONTROLBUF operations.
DEVICEINFO returns the device type and configured record
length.
FILEINFO returns error information and characteristics
of an open file.
OPEN starts access to a file.
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