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