Re: [QUESTION]: sk->data_ready/state_change callbacks in struct sock

[David S. Miller]

Bob Matthews writes:
 > So, here are my questions:
 > 
 > - My understanding from the code is that sk->state_change is called when a
 > struct sock transits from SYN_RCVD to ESTABLISHED and from ESTABLISHED to
 > {CLOSE_WAIT,FIN_WAIT_1}.  Is this correct?

This happens for the CHILD socket, not the listening one.

 > - sk->data_ready is called whenever any new data is deposited in the
 > associated sk_buff.  Is this correct?

Yes, and for listening sockets this is the callback made when a new
connection comes in.  See net/sunrpc/svcsock.c function
svc_tcp_listen_data_ready(), it's doing what you want to do.  Make
sure to check in a recent kernel because this used to make the same
mistake you are making, using state_change instead of data_ready on a
listening socket.

Later,
David S. Miller
[e-mail]