Virtualization - Oct 2010 - vhost_net_ioctl

Hi All,


           What's the role or value of the third argument in the
vhost_net_ioctl function in /drivers/vhost/net.c .

       The function declaration is

         static long vhost_net_ioctl(struct file *f, unsigned int
ioctl, unsigned long arg)

As per my knowledge,

*f represents the fd of vhost-net device,
ioctl  any device request like VHOST_NET_SET_BACKEND,

But what's the third arg represent ?

With hope,
Devi.

On Wed, Oct 6, 2010 at 11:16 AM, devi thapa <devi.thapa at gmail.com>
wrote:
> ? ? ? ? ? What's the role or value of the third argument in the
> vhost_net_ioctl function in /drivers/vhost/net.c .
Read the code.  There is the kernel vhost code and the QEMU vhost
userspace code to look at.  By studying both sides you can figure this
out.

Look at how arg is used in vhost_net_ioctl().

Please spend more time learning how things work before sending
questions to the mailing list.

Stefan