| /**************************************************************************** |
| * libs/libc/netdb/lib_dnsinit.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 <string.h> |
| #include <errno.h> |
| #include <assert.h> |
| |
| #include <arpa/inet.h> |
| |
| #include <nuttx/sched.h> |
| #include <nuttx/mutex.h> |
| #include "netdb/lib_dns.h" |
| |
| /**************************************************************************** |
| * Private Data |
| ****************************************************************************/ |
| |
| /* Protects DNS cache, nameserver list and notify list. */ |
| |
| static rmutex_t g_dns_lock = NXRMUTEX_INITIALIZER; |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Name: dns_lock |
| * |
| * Description: |
| * Take the DNS lock, ignoring errors due to the receipt of signals. |
| * |
| ****************************************************************************/ |
| |
| void dns_lock(void) |
| { |
| nxrmutex_lock(&g_dns_lock); |
| } |
| |
| /**************************************************************************** |
| * Name: dns_unlock |
| * |
| * Description: |
| * Release the DNS lock |
| * |
| ****************************************************************************/ |
| |
| void dns_unlock(void) |
| { |
| nxrmutex_unlock(&g_dns_lock); |
| } |
| |
| /**************************************************************************** |
| * Name: dns_breaklock |
| * |
| * Description: |
| * Break the DNS lock |
| ****************************************************************************/ |
| |
| void dns_breaklock(FAR unsigned int *count) |
| { |
| nxrmutex_breaklock(&g_dns_lock, count); |
| } |
| |
| /**************************************************************************** |
| * Name: dns_restorelock |
| * |
| * Description: |
| * Restore the DNS lock |
| * |
| ****************************************************************************/ |
| |
| void dns_restorelock(unsigned int count) |
| { |
| nxrmutex_restorelock(&g_dns_lock, count); |
| } |