1  /* Internet Socket Example
       2     Copyright (C) 1991-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU General Public License
       6     as published by the Free Software Foundation; either version 2
       7     of the License, or (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program; if not, see <https://www.gnu.org/licenses/>.
      16  */
      17  
      18  #include <stdio.h>
      19  #include <stdlib.h>
      20  #include <sys/socket.h>
      21  #include <netinet/in.h>
      22  
      23  int
      24  make_socket (uint16_t port)
      25  {
      26    int sock;
      27    struct sockaddr_in name;
      28  
      29    /* Create the socket. */
      30    sock = socket (PF_INET, SOCK_STREAM, 0);
      31    if (sock < 0)
      32      {
      33        perror ("socket");
      34        exit (EXIT_FAILURE);
      35      }
      36  
      37    /* Give the socket a name. */
      38    name.sin_family = AF_INET;
      39    name.sin_port = htons (port);
      40    name.sin_addr.s_addr = htonl (INADDR_ANY);
      41    if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0)
      42      {
      43        perror ("bind");
      44        exit (EXIT_FAILURE);
      45      }
      46  
      47    return sock;
      48  }