| 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 |
| 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 (name: 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 |