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From: carl@CITHEX.CALTECH.EDU (Carl J Lydick)
Newsgroups: comp.os.vms
Subject: Re: Redirection of IO...
Message-ID: <870820155443.01l@CitHex.Caltech.Edu>
Date: Thu, 20-Aug-87 19:00:34 EDT
Article-I.D.: CitHex.870820155443.01l
Posted: Thu Aug 20 19:00:34 1987
Date-Received: Sat, 22-Aug-87 19:48:38 EDT
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 > I have a question for all the VMS gods out there. How do I do this,
 > 
 >         $ define/user sys$input input.dat
 >         $ define/user sys$output output.dat
 >         $ run the_program
 > 
 > within a program (.EXE as opposed to .COM). The following call will not work
 > 
 >         LIB$SPAWN('run the_program','input.dat','output.dat',...)
 > 
 > because after executing 'run the_program' LIB$SPAWN tries to execute
 > INPUT.DAT I'm working on a program to do general redirection of IO and this
 > problem has me at a stand still. Could someone help me?

The problem is that the logical names created by LIB$SPAWN aren't USER_MODE.  
The only simple workaround I know of is to create a file with the commands:
        $ define/user sys$input input.dat
        $ define/user sys$output output.dat
        $ run the_program
in it, then use lib$spawn to create a process with that file as its input.