sbappend(struct socket *so, struct mbuf *m) { int ret = 0; DEBUG_CALL("sbappend"); DEBUG_ARG("so = %p", so); DEBUG_ARG("m = %p", m); DEBUG_ARG("m->m_len = %d", m->m_len); /* Shouldn't happen, but... e.g. foreign host closes connection */ if (m->m_len <= 0) { m_free(m); return; } /* * If there is urgent data, call sosendoob * if not all was sent, sowrite will take care of the rest * (The rest of this function is just an optimisation) */ if (so->so_urgc) { sbappendsb(&so->so_rcv, m); m_free(m); sosendoob(so); return; } /* * We only write if there's nothing in the buffer, * ottherwise it'll arrive out of order, and hence corrupt */ if (!so->so_rcv.sb_cc) ret = slirp_send(so, m->m_data, m->m_len, 0); if (ret <= 0) { /* * Nothing was written * It's possible that the socket has closed, but * we don't need to check because if it has closed, * it will be detected in the normal way by soread() */ sbappendsb(&so->so_rcv, m); } else if (ret != m->m_len) { /* * Something was written, but not everything.. * sbappendsb the rest */ m->m_len -= ret; m->m_data += ret; sbappendsb(&so->so_rcv, m); } /* else */ /* Whatever happened, we free the mbuf */ m_free(m); }