incubator-nuttx/libs/libc/netdb/lib_dnsdefaultserver.c

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/****************************************************************************
* libs/libc/netdb/lib_dnsdefaultserver.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdbool.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/net/dns.h>
#include "netdb/lib_dns.h"
#ifdef CONFIG_NETDB_DNSCLIENT
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: dns_default_nameserver
*
* Description:
* Reset the resolver to use only the default DNS server, if any.
*
****************************************************************************/
#ifdef CONFIG_NETDB_RESOLVCONF
int dns_default_nameserver(void)
{
/* REVISIT: not implemented */
return -ENOSYS;
}
#else /* CONFIG_NETDB_RESOLVCONF */
int dns_default_nameserver(void)
{
dns_semtake();
g_dns_nservers = 0;
dns_semgive();
return OK;
}
#endif /* CONFIG_NETDB_RESOLVCONF */
#endif /* CONFIG_NETDB_DNSCLIENT */