1/* Internet Socket Example
2 Copyright (C) 1991-2022 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
23int
24make_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, protocol: 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 (fd: sock, addr: (struct sockaddr *) &name, len: sizeof (name)) < 0)
42 {
43 perror ("bind");
44 exit (EXIT_FAILURE);
45 }
46
47 return sock;
48}
49

source code of glibc/manual/examples/mkisock.c