Date: Thu, 18 Apr 2002 16:04:31 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Nick Hibma <n_hibma@van-laarhoven.org> Cc: Peter Haight <peterh@sapros.com>, <hardware@FreeBSD.ORG> Subject: Re: Reading from the USB ugen device. Message-ID: <20020418160144.T13784-100000@gamplex.bde.org> In-Reply-To: <004501c1e612$ede6a4c0$7800420a@vanlaarhoven.org>
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On Wed, 17 Apr 2002, Nick Hibma wrote: > > Here the problem may be the more immediate one that usb returns EIO > > instead of EWOULDBLOCK when it can't proceed. > > EIO is only returned in case of error. I was mistaken. EWOULDBLOCK can never > be returned because the ugen driver can't know whether or no the transfer is > going to block. There is no such thing as a poll for data on the USB bus. It seems to sometimes return ETIMEDOUT, which causes the same problem. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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