From:	CSBVAX::MRGATE!info-vax-RELAY@KL.SRI.COM@SMTP  3-AUG-1988 10:34
To:	ARISIA::EVERHART
Subj:	Re: Multiple-access files in VMS?


Received: from CitHex.Caltech.Edu by KL.SRI.COM with TCP; Mon, 1 Aug 88 04:28:45 PDT
Date:     Mon, 1 Aug 88 04:28:36 PDT
From:     carl@CitHex.Caltech.Edu (Carl J Lydick)
Message-Id: <880801042149.f37@CitHex.Caltech.Edu>
Subject:  Re: Multiple-access files in VMS?
In-Reply-To: Your message <1391@csun.UUCP> dated 26-Jul-1988
To:       sm.unisys.com!csun!mst@cs.utexas.edu, info-vax@CitHex.Caltech.Edu

 > 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