Re: [BUGI] IOCTL :Facing problems while acccessing data from kernel space
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
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IOCTL :Facing problems while acccessing data from kernel space
Hello All ,
Sorry for resending the message many times !!!.
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 .
Thanks and regards,
Rashmi.N.S
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Re: IOCTL :Facing problems while acccessing data from kernel space
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
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