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Diffstat (limited to 'share/doc/psd/20.ipctut/socketpair.c')
| -rw-r--r-- | share/doc/psd/20.ipctut/socketpair.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/share/doc/psd/20.ipctut/socketpair.c b/share/doc/psd/20.ipctut/socketpair.c new file mode 100644 index 000000000000..f525c76fc792 --- /dev/null +++ b/share/doc/psd/20.ipctut/socketpair.c @@ -0,0 +1,77 @@ +.\" 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]); + } +} |