Date: Wed, 28 Sep 2005 23:13:22 +0100 From: n0g0013 <ttw@cobbled.net> To: rashmi ns <nsrashmi@gmail.com> Cc: freebsd-hackers@freebsd.org, bugi@lists.redbrick.dcu.ie Subject: Re: [BUGI] IOCTL :Facing problems while acccessing data from kernel space Message-ID: <20050928221322.GB267@eyore.cobbled.net> In-Reply-To: <9f999316050928011010542946@mail.gmail.com> References: <9f999316050928011010542946@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 28.09-13:40, rashmi ns wrote:
[ ... ]
> I was trying to add a new ioctl command like
> > #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 .
i would guess that it's a simple typo and your pointer conversions
are off somewhere.
i.e.
uprintf( "%d", (int*)data ) ;
instead of
uprintf( "%d", *(int*)data ) ;
otherwise, use a debugger or post the code.
--
t
t
w
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050928221322.GB267>