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Functions and CALL Routines under OpenVMS

FOPTNUM Function: OpenVMS



Returns the number of information items available for an external file.
Category: External Files
OpenVMS specifics: Available information items
See: FOPTNUM Function in SAS Language Reference: Dictionary

Syntax
Details
See Also

Syntax

FOPTNUM(file-id)

file-id

specifies the identifier that was assigned when the file was opened, generally by the FOPEN function.


Details

Under OpenVMS, five information items are available for all types of files:

If you concatenate filenames, then an additional information item is available: File List.

The open-mode specified in the FOPEN function will determine the value that FOPTNUM returns.

Open Mode FOPTNUM Value Information Items Available
Append

Input

Sequential

Update

6 for concatenated files

5 for single files

All information items available.
Output 5 for concatenated files

4 for single files

Because the file is open for output, the File Size information type is unavailable.

For an example of how to use the FOPTNUM function, see FINFO Function: OpenVMS.


See Also

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