Re: How to retrieve buffer from struct uio ?
Re: How to retrieve buffer from struct uio ?
- Subject: Re: How to retrieve buffer from struct uio ?
- From: sanjay yaragatti <email@hidden>
- Date: Tue, 12 Sep 2006 13:35:31 +0100 (BST)
Thanks Terry. Now i am able to retrieve the buffer
from the struture uio.Thanks a lot for providing
pointers :-)
Regards,
Sanjay
--- Terry Lambert <email@hidden> wrote:
> On Sep 12, 2006, at 2:13 AM, sanjay yaragatti wrote:
> >
> > Hi all,
> > I am writing a kernel driver.I have
> regestered it
> > as character device. I am unable to implement the
> > device write method (dev_write( dev_t device,
> struct
> > uio *uio, int ioflag)) since I don't know how to
> > retrieve the buffer from struct uio.
> >
> > However on trying to dereference uio as
> > uio->uio_iov->iov_base gave a compilation error.
> >
> > Is there a KPI to retrieve the buffer sent from
> user
> > space?
>
> You may want to read /usr/include/sys/uio.h...
>
>
> /*
> * uio_curriovbase - return the base address of the
> current iovec
> associated
> * with the given uio_t. May return 0.
> */
> user_addr_t uio_curriovbase( uio_t a_uio );
>
>
> You can also look at the kernel sources; in this
> case, the function is
> implemented in:
>
>
>
<http://www.opensource.apple.com/darwinsource/10.4.7.ppc/xnu-792.6.76/bsd/kern/kern_subr.c
>
> >
>
> -- Terry
>
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