Date: Sat, 21 Jun 1997 14:56:31 +0200 From: Mark Murray <mark@grondar.za> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: Mark Murray <mark@grondar.za>, multimedia@FreeBSD.ORG Subject: Re: GUS PnP woes Message-ID: <199706211256.OAA09649@greenpeace.grondar.za>
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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
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