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15637ed4 RG |
1 | .\" Copyright (c) 1986 The Regents of the University of California. |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" Redistribution and use in source and binary forms, with or without | |
5 | .\" modification, are permitted provided that the following conditions | |
6 | .\" are met: | |
7 | .\" 1. Redistributions of source code must retain the above copyright | |
8 | .\" notice, this list of conditions and the following disclaimer. | |
9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer in the | |
11 | .\" documentation and/or other materials provided with the distribution. | |
12 | .\" 3. All advertising materials mentioning features or use of this software | |
13 | .\" must display the following acknowledgement: | |
14 | .\" This product includes software developed by the University of | |
15 | .\" California, Berkeley and its contributors. | |
16 | .\" 4. Neither the name of the University nor the names of its contributors | |
17 | .\" may be used to endorse or promote products derived from this software | |
18 | .\" without specific prior written permission. | |
19 | .\" | |
20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | .\" SUCH DAMAGE. | |
31 | .\" | |
78ed81a3 | 32 | .\" from: @(#)socketpair.c 6.4 (Berkeley) 4/17/91 |
33 | .\" socketpair.c,v 1.2 1993/08/01 18:23:29 mycroft Exp | |
15637ed4 RG |
34 | .\" |
35 | #include <sys/types.h> | |
36 | #include <sys/socket.h> | |
37 | #include <stdio.h> | |
38 | ||
39 | #define DATA1 "In Xanadu, did Kublai Khan . . ." | |
40 | #define DATA2 "A stately pleasure dome decree . . ." | |
41 | ||
42 | /* | |
43 | * This program creates a pair of connected sockets then forks and | |
44 | * communicates over them. This is very similar to communication with pipes, | |
45 | * however, socketpairs are two-way communications objects. Therefore I can | |
46 | * send messages in both directions. | |
47 | */ | |
48 | ||
49 | main() | |
50 | { | |
51 | int sockets[2], child; | |
52 | char buf[1024]; | |
53 | ||
54 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) < 0) { | |
55 | perror("opening stream socket pair"); | |
56 | exit(1); | |
57 | } | |
58 | ||
59 | if ((child = fork()) == -1) | |
60 | perror("fork"); | |
61 | else if (child) { /* This is the parent. */ | |
62 | close(sockets[0]); | |
63 | if (read(sockets[1], buf, 1024, 0) < 0) | |
64 | perror("reading stream message"); | |
65 | printf("-->%s\en", buf); | |
66 | if (write(sockets[1], DATA2, sizeof(DATA2)) < 0) | |
67 | perror("writing stream message"); | |
68 | close(sockets[1]); | |
69 | } else { /* This is the child. */ | |
70 | close(sockets[1]); | |
71 | if (write(sockets[0], DATA1, sizeof(DATA1)) < 0) | |
72 | perror("writing stream message"); | |
73 | if (read(sockets[0], buf, 1024, 0) < 0) | |
74 | perror("reading stream message"); | |
75 | printf("-->%s\en", buf); | |
76 | close(sockets[0]); | |
77 | } | |
78 | } |