Function sctp_sorecvmsg

freebsd/netinet/sctputil.c:5452–6415

}

int
sctp_sorecvmsg(struct socket *so,
    struct uio *uio,
    struct mbuf **mp,
    struct sockaddr *from,
    int fromlen,
    int *msg_flags,
    struct sctp_sndrcvinfo *sinfo,
    int filling_sinfo)
{
	/*
	 * MSG flags we will look at MSG_DONTWAIT - non-blocking IO.
	 * MSG_PEEK - Look don't touch :-D (only valid with OUT mbuf copy
	 * mp=NULL thus uio is the copy method to userland) MSG_WAITALL - ??
	 * On the way out we may send out any combination of:
	 * MSG_NOTIFICATION MSG_EOR
	 *
	 */
	struct sctp_inpcb *inp = NULL;
	ssize_t my_len = 0;
	ssize_t cp_len = 0;
	int error = 0;
	struct sctp_queued_to_read *control = NULL, *ctl = NULL, *nxt = NULL;
	struct mbuf *m = NULL;
	struct sctp_tcb *stcb = NULL;
	int wakeup_read_socket = 0;
	int freecnt_applied = 0;
	int out_flags = 0, in_flags = 0;
	int block_allowed = 1;
	uint32_t freed_so_far = 0;
	ssize_t copied_so_far = 0;
	int in_eeor_mode = 0;
	int no_rcv_needed = 0;
	uint32_t rwnd_req = 0;
	int hold_sblock = 0;
	int hold_rlock = 0;
	ssize_t slen = 0;
	uint32_t held_length = 0;
	int sockbuf_lock = 0;

	if (uio == NULL) {
		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTPUTIL, EINVAL);
		return (EINVAL);
	}

	if (msg_flags) {
		in_flags = *msg_flags;
		if (in_flags & MSG_PEEK)
			SCTP_STAT_INCR(sctps_read_peeks);
	} else {
		in_flags = 0;
	}
	slen = uio->uio_resid;

	/* Pull in and set up our int flags */
	if (in_flags & MSG_OOB) {
		/* Out of band's NOT supported */
		return (EOPNOTSUPP);