Xref: utzoo comp.sys.dec:2826 comp.os.vms:23346
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!pacbell!rtech!mikes@rtech.UUCP
From: mikes@rtech.UUCP (Mike Schilling)
Newsgroups: comp.sys.dec,comp.os.vms
Subject: Re: Runtime loading of shareable images
Message-ID: <4969@rtech.rtech.com>
Date: 12 Mar 90 18:12:17 GMT
References: <27705@cup.portal.com>
Sender: news@rtech.rtech.com
Distribution: usa
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From article <27705@cup.portal.com>, by Prodas@cup.portal.com (Henry Lewis Feldman):
> I have a question about run-time dynamic linking.
> 
> I am working on a C program that during run-time must choose between
> several different subroutines.  Ideally these run-time subroutines
> should be "shareable images".  But is there a program callable routine
> that will dynamically load an image, my reading of the linker is that
> link to the shareable image is fixed at link time.  My program must choose
> between one of many images after the program has started.
> 
> Can anyone point me to the proper routines?
> 
I'm posting this, rather than mailing it, because the technique is so generally
useful:

Use LIB$FIND_IMAGE_SYMBOL.  It will, at run-time, map a shareable image and
return the value of any universal symbol which that image defines. 
----------------------------------------------------------------------------
"I want the right to urinate in different colors"  -- Tom Stoppard, "Travesties"
mikes@rtech.com = Mike Schilling, Ingres Corporation, Alameda, CA