Generic datagram poll
unsigned int datagram_poll(struct file * file, struct socket * sock, poll_table * wait);
file
file struct
sock
socket
wait
poll table
Again totally generic. This also handles sequenced packet sockets providing the socket receive queue is only ever holding data ready to receive.
when you _don't_ use this routine for this protocol, and you use a different write policy from sock_writeable then please supply your own write_space callback.