Function sodealloc

freebsd/kern/uipc_socket.c:459–499

* Free the storage associated with a socket at the socket layer, tear down * locks, labels, etc. All protocol state is assumed already to have been * torn down (and possibly never set up) by the caller. */

 * torn down (and possibly never set up) by the caller.
 */
static void
sodealloc(struct socket *so)
{

	KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
	KASSERT(so->so_pcb == NULL, ("sodealloc(): so_pcb != NULL"));

	mtx_lock(&so_global_mtx);
	so->so_gencnt = ++so_gencnt;
	--numopensockets;	/* Could be below, but faster here. */
#ifdef VIMAGE
	VNET_ASSERT(so->so_vnet != NULL, ("%s:%d so_vnet is NULL, so=%p",
	    __func__, __LINE__, so));
	so->so_vnet->vnet_sockcnt--;
#endif
	mtx_unlock(&so_global_mtx);
#ifdef MAC
	mac_socket_destroy(so);
#endif
	hhook_run_socket(so, NULL, HHOOK_SOCKET_CLOSE);

	crfree(so->so_cred);
	khelp_destroy_osd(&so->osd);
	if (SOLISTENING(so)) {
		if (so->sol_accept_filter != NULL)
			accept_filt_setopt(so, NULL);
	} else {
		if (so->so_rcv.sb_hiwat)
			(void)chgsbsize(so->so_cred->cr_uidinfo,
			    &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
		if (so->so_snd.sb_hiwat)
			(void)chgsbsize(so->so_cred->cr_uidinfo,
			    &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
		sx_destroy(&so->so_snd.sb_sx);
		sx_destroy(&so->so_rcv.sb_sx);
		SOCKBUF_LOCK_DESTROY(&so->so_snd);
		SOCKBUF_LOCK_DESTROY(&so->so_rcv);
	}
	mtx_destroy(&so->so_lock);
	uma_zfree(socket_zone, so);
}

/*
 * socreate returns a socket with a ref count of 1.  The socket should be