1 /* Internet Socket Example
2    Copyright (C) 1991-2021 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
make_socket(uint16_t port)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 }
49