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

FOPTNUM(file-id)

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

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.

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.