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1 | /* Internet Socket Example using sockaddr_in. | |
2 | Copyright (C) 1991-2019 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 | |
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 | } |