sock_opctl_action_t
extern void so_opctl(sock_upper_handle_t, sock_opctl_action_t, uintptr_t);
so_opctl(sock_upper_handle_t sock_handle, sock_opctl_action_t action,
static void sctp_assoc_disconnecting(sock_upper_handle_t, sock_opctl_action_t,
sctp_assoc_disconnecting(sock_upper_handle_t handle, sock_opctl_action_t action,
tcp_dummy_opctl(sock_upper_handle_t x, sock_opctl_action_t y, uintptr_t blah)
void (*su_opctl)(sock_upper_handle_t, sock_opctl_action_t,