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From: cmcmanis@sun.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: How to tell if Volume is Mounted?
Message-ID: <15624@sun.uucp>
Date: Wed, 25-Mar-87 14:13:15 EST
Article-I.D.: sun.15624
Posted: Wed Mar 25 14:13:15 1987
Date-Received: Fri, 27-Mar-87 05:10:39 EST
References: <489@batcomputer.tn.cornell.edu>
Organization: Sun Microsystems, Inc. - Mtn View, CA
Lines: 26
Keywords: Volume, Mounted, DeviceList
Summary: Check the handler field

In article <489@batcomputer.tn.cornell.edu>, Dan Green writes:
< [] <---- Not needed
<    Does anyone know how to tell if a Volume is mounted or not?
< I use my own varient of Phillip Lindsay's GetDisk, which scans
< through the DeviceLists (headed by DevInfo) and reports all the
< Volume names.  But I can't figure out where in the DeviceList
< structure the flag for mounted or not-mounted is maintained.  It
< must be there somewhere because the CLI's INFO command can tell.
<    So if I give you either a volume name, or a pointer to a
< DeviceList (eg from the Volume field in a lock), how could I
< determine whether the volume was mounted?  Thanks very much
< for any information.
< -- Dan Green

The simple answer is look in the code for the C version of Assign that
I wrote on Fish disk fifty something. The real answer is the file
handler field. It contains the address of the file handler task that 
is handling this volume. It will be NULL when the Volume is not mounted.
This is also a quick way to check if accessing this volume will cause
an 'Insert Disk' requester to appear.


-- 
--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
These opinions are my own and no one elses, but you knew that didn't you.