.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" This manpage is Copyright (C) 2006 Jens Axboe
.\" and Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" Japanese Version Copyright (c) 2007  Akihiro MOTOKI
.\"         all rights reserved.
.\" Translated 2007-02-04, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" 
.TH TEE 2 2006-04-28 "Linux" "Linux Programmer's Manual"
.SH ̾
tee \- ѥפȤʣ
.SH 
.nf
.B #define _GNU_SOURCE
.B #include <fcntl.h>

.BI "long tee(int " fd_in ", int " fd_out ", size_t " len \
", unsigned int " flags );
.fi
.SH 
.\" Example programs http://brick.kernel.dk/snaps
.\"
.\"
.\" add a "tee(in, out1, out2)" system call that duplicates the pages
.\" (again, incrementing their reference count, not copying the data) from
.\" one pipe to two other pipes.
.BR tee ()
ϡեǥץ
.I fd_in
Ȥѥפեǥץ
.I fd_out
Ȥѥפغ
.I len
ХȤΥǡʣ롣
Ǥϡʣǡ
.I fd_in
Ͼ񤵤ʤäơΥǡ򤳤θ
.BR splice (2)
ǥԡ뤳ȤǤ롣

.I flags
ϰϢνե饰Ǥꡢ
.BR splice (2)

.BR vmsplice (2)
ȶ̤̾Ǥ롣
.TP 1.9i
.B SPLICE_F_MOVE
ߤΤȤ
.BR tee ()
Ǥϲθ̤ʤ
.BR splice (2)
ȡ
.TP
.B SPLICE_F_NONBLOCK
ϻ (block) ʤ
ܺ٤
.BR splice (2)
ȡ
.TP
.B SPLICE_F_MORE
ߤΤȤ
.BR tee ()
Ǥϲθ̤ʤŪˤϼǽ롣
.BR splice (2)
ȡ
.TP
.B SPLICE_F_GIFT
.BR tee ()
Ǥ̤ѡ
.BR vmsplice (2)
ȡ
.SH ֤
ƴλȡ
.BR tee ()
ϴ֤ʣ줿Хȿ֤
֤ 0 ϥǡžԤʤäȤ򼨤
ξ硢 (block) Ƥ̵̣Ǥ롣
ʤʤ顢
.I fd_in
Ȥѥפν񤭹¦³ƤԤʤǤ롣

顼ξ硢
.BR tee ()
 \-1 ֤
.I errno
˥顼򼨤ͤꤹ롣
.SH 顼
.TP
.B EINVAL
.I fd_in

.I fd_out
Τɤ餫ѥפ򻲾ȤƤʤ⤷
.I fd_in

.I fd_out
Ʊѥפ򻲾ȤƤ롣
.TP
.B ENOMEM
­
.SH С
.BR tee ()
ƥॳ Linux 2.6.17 ǽо줷
.SH 
Υƥॳ Linux ͭǤ롣
.SH 
ǰȤƤϡ
.BR tee ()
ĤΥѥ״֤ǥǡΥԡԤ
ºݤˤϼ¥ǡΥԡϹԤʤ
Ǥϡ
.BR tee ()
¦Ф뻲Ȥ뤳Ȥǽ¦˥ǡ
ɲä롣
.SH 
ʲϡ
.BR tee ()
ƥॳȤäơ
Ū
.BR tee (1)
ץΤǤ롣
.nf

#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>

int
main(int argc, char *argv[])
{
    int fd;
    int len, slen;

    assert(argc == 2);

    fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
    if (fd == \-1) {
        perror("open");
        exit(EXIT_FAILURE);
    }

    do {
        /*
         * tee stdin to stdout.
         */
        len = tee(STDIN_FILENO, STDOUT_FILENO,
                  INT_MAX, SPLICE_F_NONBLOCK);

        if (len < 0) {
            if (errno == EAGAIN)
                continue;
            perror("tee");
            exit(EXIT_FAILURE);
        } else
            if (len == 0)
                break;

        /*
         * Consume stdin by splicing it to a file.
         */
        while (len > 0) {
            slen = splice(STDIN_FILENO, NULL, fd, NULL,
                          len, SPLICE_F_MOVE);
            if (slen < 0) {
                perror("splice");
                break;
            }
            len \-= slen;
        }
    } while (1);

    close(fd);
    exit(EXIT_SUCCESS);
}
.fi
.SH Ϣ
.BR splice (2),
.BR vmsplice (2),
.BR feature_test_macros (7)