1 | /* Example of Reading Datagrams |
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 <errno.h> |
20 | #include <unistd.h> |
21 | #include <stdlib.h> |
22 | #include <sys/socket.h> |
23 | #include <sys/un.h> |
24 | |
25 | #define SERVER "/tmp/serversocket" |
26 | #define CLIENT "/tmp/mysocket" |
27 | #define MAXMSG 512 |
28 | #define MESSAGE "Yow!!! Are we having fun yet?!?" |
29 | |
30 | int |
31 | main (void) |
32 | { |
33 | extern int make_named_socket (const char *name); |
34 | int sock; |
35 | char message[MAXMSG]; |
36 | struct sockaddr_un name; |
37 | size_t size; |
38 | int nbytes; |
39 | |
40 | /* Make the socket. */ |
41 | sock = make_named_socket (CLIENT); |
42 | |
43 | /* Initialize the server socket address. */ |
44 | name.sun_family = AF_LOCAL; |
45 | strcpy (name.sun_path, SERVER); |
46 | size = strlen (name.sun_path) + sizeof (name.sun_family); |
47 | |
48 | /* Send the datagram. */ |
49 | nbytes = sendto (fd: sock, MESSAGE, n: strlen (MESSAGE) + 1, flags: 0, |
50 | addr: (struct sockaddr *) & name, addr_len: size); |
51 | if (nbytes < 0) |
52 | { |
53 | perror ("sendto (client)" ); |
54 | exit (EXIT_FAILURE); |
55 | } |
56 | |
57 | /* Wait for a reply. */ |
58 | nbytes = recvfrom (fd: sock, buf: message, MAXMSG, flags: 0, NULL, addr_len: 0); |
59 | if (nbytes < 0) |
60 | { |
61 | perror ("recfrom (client)" ); |
62 | exit (EXIT_FAILURE); |
63 | } |
64 | |
65 | /* Print a diagnostic message. */ |
66 | fprintf (stderr, "Client: got message: %s\n" , message); |
67 | |
68 | /* Clean up. */ |
69 | remove (CLIENT); |
70 | close (fd: sock); |
71 | } |
72 | |