Function soupcall_set

freebsd/kern/uipc_socket.c:4113–4134

* Register per-socket buffer upcalls. */

 * Register per-socket buffer upcalls.
 */
void
soupcall_set(struct socket *so, int which, so_upcall_t func, void *arg)
{
	struct sockbuf *sb;

	KASSERT(!SOLISTENING(so), ("%s: so %p listening", __func__, so));

	switch (which) {
	case SO_RCV:
		sb = &so->so_rcv;
		break;
	case SO_SND:
		sb = &so->so_snd;
		break;
	default:
		panic("soupcall_set: bad which");
	}
	SOCKBUF_LOCK_ASSERT(sb);
	sb->sb_upcall = func;
	sb->sb_upcallarg = arg;
	sb->sb_flags |= SB_UPCALL;
}

void
soupcall_clear(struct socket *so, int which)