Date: Sat, 21 Jun 1997 08:54:58 -0700 From: Amancio Hasty <hasty@rah.star-gate.com> To: Mark Murray <mark@grondar.za> Cc: John-Mark Gurney <gurney_j@resnet.uoregon.edu>, multimedia@FreeBSD.ORG Subject: Re: GUS PnP woes Message-ID: <199706211554.IAA08263@rah.star-gate.com> In-Reply-To: Your message of "Sat, 21 Jun 1997 14:56:31 %2B0200." <199706211256.OAA09649@greenpeace.grondar.za>
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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
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>
>
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