vio_get_iov()

Convert a VIRTIO descriptor request into an iov array

Synopsis:

#include <qvm/vio.h>
ssize_t vio_get_iov(const vdev_t *vdp,
                    vq_t *vq,
                    unsigned didx,
                    struct vio_iov *iov)

Arguments:

vdp
A pointer to a vdev's state structure.
vq
A pointer to the virtual queue from which we are taking descriptors.
didx
An index to the descriptor.
iov
A pointer to the converted request structure.

Returns:

If successful, the number of bytes to transfer; otherwise a negative errno value.

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