Re: how to use the function copyout()
From: Stefan Sperling (stsp_at_stsp.in-berlin.de)
Date: 07/25/05
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Date: Mon, 25 Jul 2005 14:53:27 +0200 To: Felix-KM <Felix-KM@yandex.ru>
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 _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
- Previous message: Steven Hartland: "Re: aac_pci.c Patch (support for HP ML110 G2)"
- In reply to: Felix-KM: "how to use the function copyout()"
- Next in thread: Kamal R. Prasad: "Re: how to use the function copyout()"
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