int nn_rep_recv (struct nn_sockbase *self, struct nn_msg *msg)
{
int rc;
struct nn_rep *rep;
rep = nn_cont (self, struct nn_rep, xrep.sockbase);
/* If a request is already being processed, cancel it. */
if (nn_slow (rep->flags & NN_REP_INPROGRESS)) {
nn_chunkref_term (&rep->backtrace);
rep->flags &= ~NN_REP_INPROGRESS;
}
/* Receive the request. */
rc = nn_xrep_recv (&rep->xrep.sockbase, msg);
if (nn_slow (rc == -EAGAIN))
return -EAGAIN;
errnum_assert (rc == 0, -rc);
/* Store the backtrace. */
nn_chunkref_mv (&rep->backtrace, &msg->sphdr);
nn_chunkref_init (&msg->sphdr, 0);
rep->flags |= NN_REP_INPROGRESS;
return 0;
}
int nn_rep_send (struct nn_sockbase *self, struct nn_msg *msg)
{
int rc;
struct nn_rep *rep;
rep = nn_cont (self, struct nn_rep, xrep.sockbase);
/* If no request was received, there's nowhere to send the reply to. */
if (nn_slow (!(rep->flags & NN_REP_INPROGRESS)))
return -EFSM;
/* Move the stored backtrace into the message header. */
nn_assert (nn_chunkref_size (&msg->sphdr) == 0);
nn_chunkref_term (&msg->sphdr);
nn_chunkref_mv (&msg->sphdr, &rep->backtrace);
rep->flags &= ~NN_REP_INPROGRESS;
/* Send the reply. If it cannot be sent because of pushback,
drop it silently. */
rc = nn_xrep_send (&rep->xrep.sockbase, msg);
errnum_assert (rc == 0 || rc == -EAGAIN, -rc);
return 0;
}
void nn_msg_mv (struct nn_msg *dst, struct nn_msg *src)
{
nn_chunkref_mv (&dst->hdr, &src->hdr);
nn_chunkref_mv (&dst->body, &src->body);
}