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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (C) 2005, 2008, Michael Kerrisk <mtk.manpages@gmail.com>
.\" (A few fragments remain from an earlier (1992) version by
.\" Drew Eckhardt <drew@cs.colorado.edu>.)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Modified by Michael Haardt <michael@moria.de>
.\" Modified 1993-07-23 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1996-10-22 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
.\" Modified 2005, mtk: added an example program
.\" Modified 2008-01-09, mtk: rewrote DESCRIPTION; minor additions
.\" to EXAMPLE text.
.\"
.\" Japanese Version Copyright (c) 1997 SUTO, Mitsuaki
.\" all rights reserved.
.\" Translated Thu Jun 26 21:09:51 JST 1997
.\" by SUTO, Mitsuaki <suto@av.crl.sony.co.jp>
.\" Updated & Modified Thu Feb 10 00:47:11 JST 2005
.\" by Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated & Modified Sat Dec 17 08:10:16 JST 2005 by Yuichi SATO
.\" Updated 2008-02-10, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.77
.\"
.TH PIPE 2 2008-01-09 "Linux" "Linux Programmer's Manual"
.SH ̾
pipe \- ѥפ
.SH
.B #include <unistd.h>
.sp
.BI "int pipe(int " pipefd "[2]);"
.SH
.BR pipe (2)
ϡѥסĤޤץ̿˻ѤǤñΥǡͥ
롣
.I pipefd
ϡѥפξüȤե롦ǥץ֤Τ˻Ѥ롣
.I pipefd[0]
ѥפɤ߽Ф¦
.I pipefd[1]
ѥפν¦Ǥ롣
ѥפν¦˽ޤ줿ǡϡ
ѥפɤ߽Ф¦ɤ߽ФޤǥͥǥХåե롣
ʤܺ٤
.BR pipe (7)
ȤΤȡ
.SH ֤
0 ֤롣Ԥ \-1 ֤ꡢ
.I errno
顼Ƥ˽äꤵ롣
.SH 顼
.TP
.B EFAULT
.I pipefd
̵ͤǤ롣
.TP
.B EMFILE
ΥץǻȤƤե롦ǥץ¿롣
.TP
.B ENFILE
ץƤեƥ¤ã
.SH
POSIX.1-2001.
.SH
.\" fork.2 ϤΥץȤƤ롣
ʲΥץǤϥѥפθ
.BR fork (2)
ǻҥץ롣
ҥץƱѥפȤեǥץΥԡ
Ѿ롣
.BR fork (2)
θ塢ƥץϥѥ
.RB ( pipe (7)
) ɬפʤʤäǥץ롣
ƥץϥץΥޥɥ饤˴ޤޤ
ʸѥפؽߡ
ҥץϤʸѥפ 1 ХȤɤ߹ɸϤ˥롣
.nf
#include <sys/wait.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
int
main(int argc, char *argv[])
{
int pipefd[2];
pid_t cpid;
char buf;
assert(argc == 2);
if (pipe(pipefd) == \-1) {
perror("pipe");
exit(EXIT_FAILURE);
}
cpid = fork();
if (cpid == \-1) {
perror("fork");
exit(EXIT_FAILURE);
}
if (cpid == 0) { /* ҥץѥפɤ߹ */
close(pipefd[1]); /* Ѥʤ write ¦ϥ */
while (read(pipefd[0], &buf, 1) > 0)
write(STDOUT_FILENO, &buf, 1);
write(STDOUT_FILENO, "\\n", 1);
close(pipefd[0]);
_exit(EXIT_SUCCESS);
} else { /* ƥץ argv[1] ѥפؽ */
close(pipefd[0]); /* Ѥʤ read ¦ϥ */
write(pipefd[1], argv[1], strlen(argv[1]));
close(pipefd[1]); /* ɤ߹¦ EOF ˽в */
wait(NULL); /* ҥץԤ */
exit(EXIT_SUCCESS);
}
}
.fi
.SH Ϣ
.BR fork (2),
.BR read (2),
.BR socketpair (2),
.BR write (2),
.BR popen (3),
.BR pipe (7)
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