Date: Mon, 25 Jul 2005 14:53:27 +0200 From: Stefan Sperling <stsp@stsp.in-berlin.de> To: Felix-KM <Felix-KM@yandex.ru> Cc: freebsd-hackers@freebsd.org Subject: Re: how to use the function copyout() Message-ID: <20050725125327.GA2213@dice.seeling33.de> In-Reply-To: <42E4DC88.000006.21996@camay.yandex.ru> References: <42E4DC88.000006.21996@camay.yandex.ru>
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On Mon, Jul 25, 2005 at 04:35:20PM +0400, Felix-KM wrote:
> I can't understand how to use the function copyout().
> It is necessary to write the data from a device driver to the
> array defined in user program.
> I do it this way:
>
> #define IOCTL_GET_B _IOWR("F", 127, 0x4)
<snip>
> Here I get EFAULT.
>
> What have I done wrong? How can I do it correctly?
You may need to add your ioctl to another middle layer.
For example, to add ioctls to network devices, I first added
defines to sockio.h only, and it wouldn't work ("device not
configured"). Then I found out that I had to add my ioctls
to a rather large switch statement in if.c too.
hope this helps,
--
stefan
http://stsp.in-berlin.de PGP Key: 0xF59D25F0
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