thanks a million everyone!

dougc

Charles Stevenson wrote:
Look up FILEINFO() function.
Look up STATUS statement (STATEMENT, not function), too.

   $include UNIVERSE.INCLUDE FILEINFO.H
   IF ASSIGNED( VAR ) THEN
      IF FILEINFO(  VAR, FINFO$IS.FILEVAR ) THEN
         * yep, it's a file variable alright.
      END ELSE
         * it's been assigned but it ain't a file.
      END
   END ELSE
      * it's not even been used yet,
      * ;et alone a file variable.
   END

The UV documentation talks about
   $INCLUDE SYSCOM FILEINFO.INC
instead of
   $INCLUDE UNIVERSE.INCLUDE FILEINFO.H
but that's language cribbed from old Prime Information manuals and never
corrected.

All the above is from memory. I might have a few details wrong, but that's
the vibe of the thing.

Chuck Stevenson
stevenson.c...@gmail.com  - new email address


doug chanco  wrote:

is there a way (universe 10.2.x/aix) to tell if a file pointer passed into
a subroutine as a parameter is valid?
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