Path: utzoo!utgpu!attcan!uunet!husc6!psuvax1!rutgers!ucsd!nosc!helios.ee.lbl.gov!pasteur!ucbvax!CITHEX.CALTECH.EDU!carl
From: carl@CITHEX.CALTECH.EDU (Carl J Lydick)
Newsgroups: comp.os.vms
Subject: Re: Multiple-access files in VMS?
Message-ID: <880801042149.f37@CitHex.Caltech.Edu>
Date: 1 Aug 88 11:28:36 GMT
References: <1391@csun.UUCP>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
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 > Does anyone out there know how to make a file  multi-accessible  (readwise)
 > in VMS?  There must be a way since I would think that the help file is that
 > way.  Any help is appreciated.

I take it you mean you want several processes to be  able  to  read  the  file
simultaneously.   This  is not an attribute of the file; it depends on how you
open the file.  The following three examples show you how to do it in three of
the most commonly used high-level languages.

In FORTRAN:
		OPEN(UNIT=1,FILE='TEST.DAT',SHARED,READONLY,STATUS='OLD')
In C:
	#include file
		int fd;
		fd = open("TEST.DAT", O_RDONLY, 0777, "shr=get");
In DCL:
	$ open/read/share=read file test.dat