1994-05-30 19:09:18 +00:00
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.\" Copyright (c) 1986, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)socketpair.c 8.1 (Berkeley) 6/8/93
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.\"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#define DATA1 "In Xanadu, did Kublai Khan . . ."
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#define DATA2 "A stately pleasure dome decree . . ."
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/*
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* This program creates a pair of connected sockets then forks and
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* communicates over them. This is very similar to communication with pipes,
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* however, socketpairs are two-way communications objects. Therefore I can
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1995-05-30 06:58:14 +00:00
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* send messages in both directions.
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1994-05-30 19:09:18 +00:00
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*/
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main()
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{
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int sockets[2], child;
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char buf[1024];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) < 0) {
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perror("opening stream socket pair");
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exit(1);
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}
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if ((child = fork()) == -1)
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perror("fork");
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else if (child) { /* This is the parent. */
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close(sockets[0]);
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if (read(sockets[1], buf, 1024, 0) < 0)
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perror("reading stream message");
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printf("-->%s\en", buf);
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if (write(sockets[1], DATA2, sizeof(DATA2)) < 0)
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perror("writing stream message");
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close(sockets[1]);
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} else { /* This is the child. */
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close(sockets[1]);
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if (write(sockets[0], DATA1, sizeof(DATA1)) < 0)
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perror("writing stream message");
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if (read(sockets[0], buf, 1024, 0) < 0)
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perror("reading stream message");
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printf("-->%s\en", buf);
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close(sockets[0]);
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}
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}
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