Date: Thu, 29 Apr 1999 09:30:48 +0800 From: Stephen Hocking-Senior Programmer PGS Tensor Perth <shocking@prth.pgs.com> To: Dag-Erling Smorgrav <des@flood.ping.uio.no> Cc: hackers@freebsd.org Subject: Re: Porting Linux Device drivers Message-ID: <199904290130.JAA12353@ariadne.tensor.pgs.com> In-Reply-To: Your message of "28 Apr 1999 11:00:41 %2B0200." <xzplnfd5dc6.fsf@flood.ping.uio.no>
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> shocking@prth.pgs.com (Stephen Hocking-Senior Programmer PGS Tensor Perth) writes:
> > The problem I'm having is that I'm using the glide Linux
> > binaries to test the device, and the positive return values are being
> > trapped somewhere and turned into -1, an obvious failure which the
> > Linux glide library interprets as an error, spitting the dummy.
>
> The userland part of the syscall mechanism stores the returned value
> in errno and returns ((ret == 0) ? p_retval[0] : -1). Hence, if you
> want to return a specific value, store it in p_retval[0] and return 0
> to indicate success.
Aaagh, I just found out where I goofed when trying to do this. That bit now
works. What happens now is that a passed structure from the glide lib's ioctl
calls doesn't seem to agree with the definition I have in the driver. Sigh.
Stephen
--
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