Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!oliveb!amiga!cbmvax!thomas
From: thomas@cbmvax.UUCP (Dave Thomas QA)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Testing for disk (Lock?)
Keywords: Lock, Help, T-Disk
Message-ID: <6248@cbmvax.UUCP>
Date: 14 Mar 89 14:38:05 GMT
References: <0422.AA0422@wfhami>
Reply-To: thomas@cbmvax.UUCP (Dave Thomas QA)
Organization: Commodore Technology, West Chester, PA
Lines: 48

In article <0422.AA0422@wfhami> bill@wfhami.UUCP (Bill Hogsett) writes:
> 
> 	I am modifying the C code for the old Tecmar T-Disk (yep its still
> ticking!).  I now have it running with FFS, but can't get the old code to
> properly tell if it is being run after the disk has already been mounted.
> 
> 	I have tried the following:
> 
> /*      This calls up a requestor!!*/
> 	lock=Lock("dh0:c", SHARED_LOCK);
> 	if (lock != 0)
> 	{
> 		UnLock(lock);	 
> 		return HDERR_IsMounted;	
>    	}
> 	This works fine if the disk has already been mounted.  It returns what 
> you would expect.  The problem is that it prompts for DH0: if it is called 
> before the disk is mounted (the normal case).
> 
>         Is there a way to check for the existence of a device or directory and
> not have a requestor if the check fails?

Yep. In the process structure there is a field called pr_ConsoleTask. If it
is set to -1 (I think) this will inhibit DOS requesters appearing for that
process.

     struct Process *p;

     p = (struct Process *) FindTask (0);
     p->pr_ConsoleTask = (APTR) -1;

This should do the trick.  You should restore the original value when your
program exits or that process will not get requesters ever again...

           Dave
> --
> ******************************************************************************
> Bill Hogsett			CLEVELAND AREA-AMIGA USERS' GROUP
> ncoast!bill			(216) 581-2284 (BBS)
> ncoast!wfhami!bill
-- 
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   Dave Thomas               COMMODORE AMIGA TEST ENGINEERING
  // /_ |\/||/_ /_           UUCP  ...{allegra,rutgers}!cbmvax!thomas
\X/ /  \|  ||\//  \
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       Opinions expressed are my own...no one else wants them
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