Date: Wed, 28 Sep 2005 11:48:13 +0200 From: Simon 'corecode' Schubert <corecode@fs.ei.tum.de> To: rashmi ns <nsrashmi@gmail.com> Cc: freebsd-hackers@freebsd.org, bugi@lists.redbrick.dcu.ie Subject: Re: IOCTL :Facing problems while acccessing data from kernel space Message-ID: <433A66DD.7010305@fs.ei.tum.de> In-Reply-To: <9f999316050928011010542946@mail.gmail.com> References: <9f999316050928011010542946@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
rashmi ns wrote:
>>#define HDLCMODE _IOR('6',0xF,int)
>>when i trying to uprintf the data which was sent from the user-space in
>>the device-driver-ioctl-routine i'll get a different value than which was
>>passed. Can anybody please tell me why this is happening . I pass the
>>address of an integer where data is stored from the user space as third arg
>>to the ioctl call .
maybe you should show how you do it in kernel. I suspect you try to
access it as an int* as well, which is wrong. The kernel already does
take care of this for you. Just write the integer you want to pass into
the data area and you're done.
cheers
simon
--
Serve - BSD +++ RENT this banner advert +++ ASCII Ribbon /"\
Work - Mac +++ space for low $$$ NOW!1 +++ Campaign \ /
Party Enjoy Relax | http://dragonflybsd.org Against HTML \
Dude 2c 2 the max ! http://golden-apple.biz Mail + News / \
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?433A66DD.7010305>