C++ ISC_LIST_EMPTY函数代码示例

static void
free_controlkeylist(controlkeylist_t *keylist, isc_mem_t *mctx) {
	while (!ISC_LIST_EMPTY(*keylist)) {
		controlkey_t *key = ISC_LIST_HEAD(*keylist);
		ISC_LIST_UNLINK(*keylist, key, link);
		free_controlkey(key, mctx);
	}
}

isc_result_t
printmessage(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers) {
	char servtext[ISC_SOCKADDR_FORMATSIZE];

	/* I've we've gotten this far, we've reached a server. */
	query_error = 0;

	debug("printmessage()");

	isc_sockaddr_format(&query->sockaddr, servtext, sizeof(servtext));
	printf("Server:\t\t%s\n", query->userarg);
	printf("Address:\t%s\n", servtext);

	puts("");

	if (!short_form) {
		isc_boolean_t headers = ISC_TRUE;
		puts("------------");
		/*		detailheader(query, msg);*/
		detailsection(query, msg, headers, DNS_SECTION_QUESTION);
		detailsection(query, msg, headers, DNS_SECTION_ANSWER);
		detailsection(query, msg, headers, DNS_SECTION_AUTHORITY);
		detailsection(query, msg, headers, DNS_SECTION_ADDITIONAL);
		puts("------------");
	}

	if (msg->rcode != 0) {
		char nametext[DNS_NAME_FORMATSIZE];
		dns_name_format(query->lookup->name,
				nametext, sizeof(nametext));
		printf("** server can't find %s: %s\n",
		       nametext, rcode_totext(msg->rcode));
		debug("returning with rcode == 0");

		/* the lookup failed */
		print_error |= 1;
		return (ISC_R_SUCCESS);
	}

	if ((msg->flags & DNS_MESSAGEFLAG_AA) == 0)
		puts("Non-authoritative answer:");
	if (!ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER]))
		printsection(query, msg, headers, DNS_SECTION_ANSWER);
	else
		printf("*** Can't find %s: No answer\n",
		       query->lookup->textname);

	if (((msg->flags & DNS_MESSAGEFLAG_AA) == 0) &&
	    (query->lookup->rdtype != dns_rdatatype_a)) {
		puts("\nAuthoritative answers can be found from:");
		printsection(query, msg, headers,
			     DNS_SECTION_AUTHORITY);
		printsection(query, msg, headers,
			     DNS_SECTION_ADDITIONAL);
	}
	return (ISC_R_SUCCESS);
}

static void
do_find(isc_boolean_t want_event) {
	isc_result_t result;
	isc_boolean_t done = ISC_FALSE;
	unsigned int options;

	options = DNS_ADBFIND_INET | DNS_ADBFIND_INET6;
	if (want_event)
		options |= DNS_ADBFIND_WANTEVENT | DNS_ADBFIND_EMPTYEVENT;
	dns_fixedname_init(&target);
	result = dns_adb_createfind(view->adb, task, adb_callback, NULL,
				    dns_fixedname_name(&fixed),
				    dns_rootname, 0, options, 0,
				    dns_fixedname_name(&target), 0,
				    &find);
	if (result == ISC_R_SUCCESS) {
		if (!ISC_LIST_EMPTY(find->list)) {
			/*
			 * We have at least some of the addresses for the
			 * name.
			 */
			INSIST((find->options & DNS_ADBFIND_WANTEVENT) == 0);
			print_addresses(find);
			done = ISC_TRUE;
		} else {
			/*
			 * We don't know any of the addresses for this
			 * name.
			 */
			if ((find->options & DNS_ADBFIND_WANTEVENT) == 0) {
				/*
				 * And ADB isn't going to send us any events
				 * either.  This query loses.
				 */
				done = ISC_TRUE;
			}
			/*
			 * If the DNS_ADBFIND_WANTEVENT flag was set, we'll
			 * get an event when something happens.
			 */
		}
	} else if (result == DNS_R_ALIAS) {
		print_name(dns_fixedname_name(&target));
		done = ISC_TRUE;
	} else {
		printf("dns_adb_createfind() returned %s\n",
		       isc_result_totext(result));
		done = ISC_TRUE;
	}

	if (done) {
		if (find != NULL)
			dns_adb_destroyfind(&find);
		isc_app_shutdown();
	}
}

void
ns_controls_destroy(ns_controls_t **ctrlsp) {
	ns_controls_t *controls = *ctrlsp;

	REQUIRE(ISC_LIST_EMPTY(controls->listeners));

	isccc_symtab_destroy(&controls->symtab);
	isc_mem_put(controls->server->mctx, controls, sizeof(*controls));
	*ctrlsp = NULL;
}

static void free_namelist (dns_message_t * msg, dns_namelist_t * namelist)
{
    dns_name_t *name;

    dns_rdataset_t *set;

    while (!ISC_LIST_EMPTY (*namelist))
    {
        name = ISC_LIST_HEAD (*namelist);
        ISC_LIST_UNLINK (*namelist, name, link);
        while (!ISC_LIST_EMPTY (name->list))
        {
            set = ISC_LIST_HEAD (name->list);
            ISC_LIST_UNLINK (name->list, set, link);
            dns_message_puttemprdataset (msg, &set);
        }
        dns_message_puttempname (msg, &name);
    }
}

void
dns_diff_clear(dns_diff_t *diff) {
	dns_difftuple_t *t;
	REQUIRE(DNS_DIFF_VALID(diff));
	while ((t = ISC_LIST_HEAD(diff->tuples)) != NULL) {
		ISC_LIST_UNLINK(diff->tuples, t, link);
		dns_difftuple_free(&t);
	}
	ENSURE(ISC_LIST_EMPTY(diff->tuples));
}

static void
httpdmgr_destroy(isc_httpdmgr_t *httpdmgr)
{
	isc_mem_t *mctx;
	isc_httpdurl_t *url;

	ENTER("httpdmgr_destroy");

	LOCK(&httpdmgr->lock);

	if (!MSHUTTINGDOWN(httpdmgr)) {
		NOTICE("httpdmgr_destroy not shutting down yet");
		UNLOCK(&httpdmgr->lock);
		return;
	}

	/*
	 * If all clients are not shut down, don't do anything yet.
	 */
	if (!ISC_LIST_EMPTY(httpdmgr->running)) {
		NOTICE("httpdmgr_destroy clients still active");
		UNLOCK(&httpdmgr->lock);
		return;
	}

	NOTICE("httpdmgr_destroy detaching socket, task, and timermgr");

	isc_socket_detach(&httpdmgr->sock);
	isc_task_detach(&httpdmgr->task);
	httpdmgr->timermgr = NULL;

	/*
	 * Clear out the list of all actions we know about.  Just free the
	 * memory.
	 */
	url = ISC_LIST_HEAD(httpdmgr->urls);
	while (url != NULL) {
		isc_mem_free(httpdmgr->mctx, url->url);
		ISC_LIST_UNLINK(httpdmgr->urls, url, link);
		isc_mem_put(httpdmgr->mctx, url, sizeof(isc_httpdurl_t));
		url = ISC_LIST_HEAD(httpdmgr->urls);
	}

	UNLOCK(&httpdmgr->lock);
	isc_mutex_destroy(&httpdmgr->lock);

	if (httpdmgr->ondestroy != NULL)
		(httpdmgr->ondestroy)(httpdmgr->cb_arg);

	mctx = httpdmgr->mctx;
	isc_mem_putanddetach(&mctx, httpdmgr, sizeof(isc_httpdmgr_t));

	EXIT("httpdmgr_destroy");
}

void
cleanup_entropy(isc_entropy_t **ectx) {
	entropysource_t *source;
	while (!ISC_LIST_EMPTY(sources)) {
		source = ISC_LIST_HEAD(sources);
		ISC_LIST_UNLINK(sources, source, link);
		isc_entropy_destroysource(&source->source);
		isc_mem_put(source->mctx, source, sizeof(*source));
	}
	isc_entropy_detach(ectx);
}

isc_boolean_t
isc__taskmgr_ready(isc_taskmgr_t *manager0) {
	isc__taskmgr_t *manager = (isc__taskmgr_t *)manager0;

#ifdef USE_SHARED_MANAGER
	if (manager == NULL)
		manager = taskmgr;
#endif
	if (manager == NULL)
		return (ISC_FALSE);
	return (ISC_TF(!ISC_LIST_EMPTY(manager->ready_tasks)));
}

void
ns_lwresd_shutdown(void) {
	ns_lwreslistener_t *listener;

	RUNTIME_CHECK(isc_once_do(&once, initialize_mutex) == ISC_R_SUCCESS);

	while (!ISC_LIST_EMPTY(listeners)) {
		listener = ISC_LIST_HEAD(listeners);
		ISC_LIST_UNLINK(listeners, listener, link);
		ns_lwreslistener_detach(&listener);
	}
}

isc_result_t
dns_fwdtable_add(dns_fwdtable_t *fwdtable, const dns_name_t *name,
		 isc_sockaddrlist_t *addrs, dns_fwdpolicy_t fwdpolicy)
{
	isc_result_t result;
	dns_forwarders_t *forwarders;
	dns_forwarder_t *fwd;
	isc_sockaddr_t *sa;

	REQUIRE(VALID_FWDTABLE(fwdtable));

	forwarders = isc_mem_get(fwdtable->mctx, sizeof(dns_forwarders_t));
	if (forwarders == NULL)
		return (ISC_R_NOMEMORY);

	ISC_LIST_INIT(forwarders->fwdrs);
	for (sa = ISC_LIST_HEAD(*addrs);
	     sa != NULL;
	     sa = ISC_LIST_NEXT(sa, link))
	{
		fwd = isc_mem_get(fwdtable->mctx, sizeof(dns_forwarder_t));
		if (fwd == NULL) {
			result = ISC_R_NOMEMORY;
			goto cleanup;
		}
		fwd->addr = *sa;
		fwd->dscp = -1;
		ISC_LINK_INIT(fwd, link);
		ISC_LIST_APPEND(forwarders->fwdrs, fwd, link);
	}
	forwarders->fwdpolicy = fwdpolicy;

	RWLOCK(&fwdtable->rwlock, isc_rwlocktype_write);
	result = dns_rbt_addname(fwdtable->table, name, forwarders);
	RWUNLOCK(&fwdtable->rwlock, isc_rwlocktype_write);

	if (result != ISC_R_SUCCESS)
		goto cleanup;

	return (ISC_R_SUCCESS);

 cleanup:
	while (!ISC_LIST_EMPTY(forwarders->fwdrs)) {
		fwd = ISC_LIST_HEAD(forwarders->fwdrs);
		ISC_LIST_UNLINK(forwarders->fwdrs, fwd, link);
		isc_mem_put(fwdtable->mctx, fwd, sizeof(dns_forwarder_t));
	}
	isc_mem_put(fwdtable->mctx, forwarders, sizeof(dns_forwarders_t));
	return (result);
}

static void
auto_detach(void *data, void *arg) {
	dns_forwarders_t *forwarders = data;
	dns_fwdtable_t *fwdtable = arg;
	isc_sockaddr_t *sa;

	UNUSED(arg);

	while (!ISC_LIST_EMPTY(forwarders->addrs)) {
		sa = ISC_LIST_HEAD(forwarders->addrs);
		ISC_LIST_UNLINK(forwarders->addrs, sa, link);
		isc_mem_put(fwdtable->mctx, sa, sizeof(isc_sockaddr_t));
	}
	isc_mem_put(fwdtable->mctx, forwarders, sizeof(dns_forwarders_t));
}

static isc_result_t
listener_startclients(ns_lwreslistener_t *listener) {
	ns_lwdclientmgr_t *cm;
	unsigned int i;
	isc_result_t result = ISC_R_SUCCESS;

	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
		      NS_LOGMODULE_LWRESD, ISC_LOG_DEBUG(6),
		      "listener_startclients: creating %d "
		      "managers with %d clients each",
		      listener->manager->ntasks, listener->manager->nclients);

	/*
	 * Create the client managers.
	 */
	for (i = 0; i < listener->manager->ntasks; i++) {
		result = ns_lwdclientmgr_create(listener,
						listener->manager->nclients,
						ns_g_taskmgr);
		if (result != ISC_R_SUCCESS)
			break;
	}

	/*
	 * Ensure that we have created at least one.
	 */
	if (ISC_LIST_EMPTY(listener->cmgrs))
		return (result);

	/*
	 * Walk the list of clients and start each one up.
	 */
	LOCK(&listener->lock);
	cm = ISC_LIST_HEAD(listener->cmgrs);
	while (cm != NULL) {
		result = ns_lwdclient_startrecv(cm);
		if (result != ISC_R_SUCCESS)
			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
				      NS_LOGMODULE_LWRESD, ISC_LOG_ERROR,
				      "could not start lwres "
				      "client handler: %s",
				      isc_result_totext(result));
		cm = ISC_LIST_NEXT(cm, link);
	}
	UNLOCK(&listener->lock);

	return (ISC_R_SUCCESS);
}

static void
free_listener(controllistener_t *listener) {
	INSIST(listener->exiting);
	INSIST(!listener->listening);
	INSIST(ISC_LIST_EMPTY(listener->connections));

	if (listener->sock != NULL)
		isc_socket_detach(&listener->sock);

	free_controlkeylist(&listener->keys, listener->mctx);

	if (listener->acl != NULL)
		dns_acl_detach(&listener->acl);

	isc_mem_putanddetach(&listener->mctx, listener, sizeof(*listener));
}

static isc_result_t
dispatch_query(struct query_trans *trans) {
	isc_result_t result;
	size_t namelen;
	isc_buffer_t b;
	char buf[4096];	/* XXX ad hoc constant, but should be enough */
	char *cp;

	REQUIRE(trans != NULL);
	REQUIRE(trans->inuse == ISC_FALSE);
	REQUIRE(ISC_LIST_EMPTY(trans->answerlist));
	REQUIRE(outstanding_queries < MAX_QUERIES);

	/* Construct qname */
	cp = fgets(buf, sizeof(buf), fp);
	if (cp == NULL)
		return (ISC_R_NOMORE);
	/* zap NL if any */
	if ((cp = strchr(buf, '\n')) != NULL)
		*cp = '\0';
	namelen = strlen(buf);
	isc_buffer_init(&b, buf, namelen);
	isc_buffer_add(&b, namelen);
	dns_fixedname_init(&trans->fixedname);
	trans->qname = dns_fixedname_name(&trans->fixedname);
	result = dns_name_fromtext(trans->qname, &b, dns_rootname, 0, NULL);
	if (result != ISC_R_SUCCESS)
		goto cleanup;

	/* Start resolution */
	result = dns_client_startresolve(client, trans->qname,
					 dns_rdataclass_in, trans->type, 0,
					 query_task, process_answer, trans,
					 &trans->xid);
	if (result != ISC_R_SUCCESS)
		goto cleanup;

	trans->inuse = ISC_TRUE;
	outstanding_queries++;

	return (ISC_R_SUCCESS);

 cleanup:
	dns_fixedname_invalidate(&trans->fixedname);

	return (result);
}