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

74 lines
2.8 KiB
C

/****************************************************************************
* libs/libc/netdb/lib_gethostbyaddr.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 <netdb.h>
#include "netdb/lib_netdb.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: gethostbyaddr
*
* Description:
* The gethostbyaddr() function returns a structure of type hostent for
* the given host address addr of length len and address type type. Valid
* address types are AF_INET and AF_INET6. The host address argument is a
* pointer to a struct of a type depending on the address type, for example
* a struct in_addr * for address type AF_INET.
*
* Input Parameters:
* addr - The address of the host to find.
* len - The length of the address
* type - The type of the address
*
* Returned Value:
* Upon successful completion, this function will return a pointer to a
* hostent structure if the requested entry was found, and a null pointer
* if the end of the database was reached or the requested entry was not
* found.
*
* Upon unsuccessful completion, gethostbyaddr() will set h_errno to
* indicate the error
*
****************************************************************************/
FAR struct hostent *gethostbyaddr(FAR const void *addr,
socklen_t len, int type)
{
FAR struct hostent *res;
int ret;
ret = gethostbyaddr_r(addr, len, type, &g_hostent, g_hostbuffer,
CONFIG_NETDB_BUFSIZE, &res, &h_errno);
return ret == 0 ? res : NULL;
}