gethostbyname.C

////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2013, Lawrence Livermore National Security, LLC.
// Produced at the Lawrence Livermore National Laboratory.
// Written by the Greg Bronevetsky <bronevetsky1@llnl.gov> / <greg@bronevetsky.com>. 
//
// LLNL-CODE-642002
// All rights reserved.
//
// This file is part of Sight. For details, see https://e-reports-ext.llnl.gov/pdf/781752.pdf or
// https://github.com/bronevet/sight.
//
// Licensed under the GNU Lesser General Public License (Lesser GPU) Version 2.1, 
// February 1999; you may not use this file except in compliance with the License.  
// The full licence is included in file LICENCE and you may obtain a copy of the 
// License at: 
// https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
//
// 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.
////////////////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <netdb.h>

int main (int argc, char *argv[]) {
    struct hostent *hstnm;
    if (argc != 2) {
        fprintf(stderr, "usage: %s hostname\n", argv[0]);
        return 1;
    }
    hstnm = gethostbyname (argv[1]);
    if (!hstnm)
        return 1;
    printf ("Name: %s\n", hstnm->h_name);
    return 0;
}