SCTP_CAN_BLOCK
int sleep = flags & SCTP_CAN_BLOCK ? KM_SLEEP : KM_NOSLEEP;
sctp->sctp_cansleep = ((flags & SCTP_CAN_BLOCK) == SCTP_CAN_BLOCK);
if (flags & SCTP_CAN_BLOCK) {
optlen, SCTP_CAN_BLOCK);
NULL, so->so_family, so->so_type, SCTP_CAN_BLOCK,
NULL, so->so_family, so->so_type, SCTP_CAN_BLOCK,
msg->msg_control, optlen, SCTP_CAN_BLOCK);
so->so_family, so->so_type, SCTP_CAN_BLOCK, &sosctp_assoc_upcalls,