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To: Mark Murray <mark@grondar.za>
cc: John-Mark Gurney <gurney_j@resnet.uoregon.edu>, multimedia@FreeBSD.ORG
Subject: Re: GUS PnP woes 
In-reply-to: Your message of "Sat, 21 Jun 1997 14:56:31 +0200."
             <199706211256.OAA09649@greenpeace.grondar.za> 
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Date: Sat, 21 Jun 1997 08:54:58 -0700
From: Amancio Hasty <hasty@rah.star-gate.com>
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Don't use /dev/audio1

	Cheers,
	Amancio

>From The Desk Of Mark Murray :
> John-Mark Gurney wrote:
> > > Two processes can't open /dev/audio. How should this work?
> > 
> > see below, they can if one is a child of another...
> > 
> > > Speak_freely has one process doing the reading and one doing the 
> > > writing. The one that starts second cannot get /dev/audio because it is 
> > > busy. This can be duplicated by going 'cat /dev/audio > /dev/audio'.
> > 
> > so you simply do something like:
> > 
> > int fd;
> > fd=open("/dev/audio", O_RDWR);
> > if(fork()) {
> > 	handle one end;
> > } else {
> > 	handle the other;
> > }
> 
> AAAHHH! Does this not therefore represent breakage of the original 
> FULL-DUPLEX model of /dev/audio (as required by eg. speak_freely)?
> 
> > really quite simple...  and the seperate audio{0,1} was probably so you
> > could simulate full duplex audio with two sound cards... one as audio0
> > and the other as audio1...
> 
> OK. ATM, if I cat a .au file to /dev/audio1, my system panics with an 
> integer overflow. I dont know enough about what I am doing to tell 
> whether this is a real problem or pilot error.
> 
> M
> --
> Mark Murray
> Join the anti-SPAM movement: http://www.cauce.org
> 
>