93 lines
3.6 KiB
C
93 lines
3.6 KiB
C
/****************************************************************************
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* libs/libc/netdb/lib_gethostbyname.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <netdb.h>
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#include <errno.h>
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#include "libc.h"
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#include "netdb/lib_netdb.h"
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#ifdef CONFIG_LIBC_NETDB
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gethostbyname
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*
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* Description:
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* The gethostbyname() function returns a structure of type hostent for
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* the given host name. Here name is either a hostname, or an IPv4 address
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* in standard dot notation (as for inet_addr(3)), or an IPv6 address in
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* colon (and possibly dot) notation.
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*
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* If name is an IPv4 or IPv6 address, no lookup is performed and
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* gethostbyname_r() simply copies name into the h_name field
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* and its struct in_addr equivalent into the h_addr_list[0] field of the
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* returned hostent structure.
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*
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* Input Parameters:
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* name - The name of the host to find.
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*
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* Returned Value:
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* Upon successful completion, this function will return a pointer to a
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* hostent structure if the requested entry was found, and a null pointer
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* if the end of the database was reached or the requested entry was not
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* found.
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*
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* Upon unsuccessful completion, gethostbyname() will set h_errno to
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* indicate the error
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*
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****************************************************************************/
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FAR struct hostent *gethostbyname(FAR const char *name)
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{
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int ret;
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DEBUGASSERT(name != NULL);
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ret = gethostbyname_r(name, &g_hostent, g_hostbuffer, CONFIG_NETDB_BUFSIZE,
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&h_errno);
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return ret == 0 ? &g_hostent : NULL;
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}
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#endif /* CONFIG_LIBC_NETDB */
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