1 /* Internet Socket Example using sockaddr_in.
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 #include <netdb.h>
23
24 void
init_sockaddr(struct sockaddr_in * name,const char * hostname,uint16_t port)25 init_sockaddr (struct sockaddr_in *name,
26 const char *hostname,
27 uint16_t port)
28 {
29 struct hostent *hostinfo;
30
31 name->sin_family = AF_INET;
32 name->sin_port = htons (port);
33 hostinfo = gethostbyname (hostname);
34 if (hostinfo == NULL)
35 {
36 fprintf (stderr, "Unknown host %s.\n", hostname);
37 exit (EXIT_FAILURE);
38 }
39 name->sin_addr = *(struct in_addr *) hostinfo->h_addr;
40 }
41