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From: gclark@utcsri.UUCP (Graeme Clark)
Newsgroups: net.micro.amiga
Subject: Questions on Execute and device assignment
Message-ID: <2933@utcsri.UUCP>
Date: Fri, 6-Jun-86 19:59:27 EDT
Article-I.D.: utcsri.2933
Posted: Fri Jun  6 19:59:27 1986
Date-Received: Fri, 6-Jun-86 20:47:42 EDT
Reply-To: gclark@utcsri.UUCP (Graeme Clark)
Distribution: net
Organization: CSRI, University of Toronto
Lines: 24
Summary: 


Two questions:

1.  When a program A runs another program B using the Execute call, how 
    can I arrange things so that B can be interrupted by a ^C or ^D?
    Specifically, A is a shell I am working on, and B is a program, such
    as the "type" program which comes with the system, which normally
    stops when a ^C is typed.  However, when B is invoked from A using the
    call
      Execute("type foo.txt", 0, 0);
    hitting a ^C does not terminate the type command.
    A performs its I/O using the Lattice C library standard I/O; it doesn't
    open any windows of its own.

2.  How can I change the assignments of logical devices from a C program?
    Do I use the DevInfo structure in the DOS global data structure?
    The DOS manual says I should not use these structures, as they are
    subject to change.  If I do have to modify the DevInfo list, do I
    need to surround the accesses with Forbid() and Permit() calls 
    to prevent other tasks examining/changing the list while I am
    modifying it?

Graeme Clark -- Dept. of Computer Science, Univ. of Toronto, Canada M5S 1A4
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