SBL_WAIT
error = SOCK_IO_SEND_LOCK(so, SBL_WAIT);
error = SOCK_IO_SEND_LOCK(so, SBL_WAIT | SBL_NOINTR);
error = SOCK_IO_RECV_LOCK(so, SBL_WAIT);
error = SOCK_IO_SEND_LOCK(so, SBL_WAIT);
error = SOCK_IO_SEND_LOCK(so, SBL_WAIT);
error = SOCK_IO_RECV_LOCK(so, SBL_WAIT | SBL_NOINTR);
error = SOCK_IO_RECV_LOCK(so, SBL_WAIT);
if ((flags & SBL_WAIT) != 0) {
error = SOCK_IO_SEND_LOCK(so_dst, SBL_WAIT | SBL_NOINTR);
error = SOCK_IO_RECV_LOCK(so_src, SBL_WAIT | SBL_NOINTR);
error = SOCK_IO_RECV_LOCK(so, SBL_WAIT | SBL_NOINTR);
sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
#define SBL_VALID (SBL_WAIT | SBL_NOINTR)
#define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)