.\"
.\" Japanese Version Copyright (c) 1999 ishikawa, keisuke
.\"         all rights reserved.
.\" Translated Thu Jan  7 00:03:12 JST 1999
.\"         by ishikawa, keisuke <ishikawa@sgk.gr.jp>
.\" Updated Sat May 19 JST 2001 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated & Modified Sun Jul  1 15:48:32 JST 2001
.\"         by Yuichi SATO <ysato@h4.dion.ne.jp>
.\"
.\" Copyright (c) 1980, 1991 Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
.\"
.\" 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.
.\"
.\"     @(#)setbuf.3	6.10 (Berkeley) 6/29/91
.\"
.\" Converted for Linux, Mon Nov 29 14:55:24 1993, faith@cs.unc.edu
.\" Added section to BUGS, Sun Mar 12 22:28:33 MET 1995,
.\"                   Thomas.Koenig@ciw.uni-karlsruhe.de
.\" Correction,  Sun, 11 Apr 1999 15:55:18,
.\"     Martin Vicente <martin@netadmin.dgac.fr>
.\" Correction,  2000-03-03, Andreas Jaeger <aj@suse.de>
.\" Added return value for setvbuf, aeb,
.\"
.TH SETBUF 3  2007-07-26 "Linux" "Linux Programmer's Manual"
.SH ̾
setbuf, setbuffer, setlinebuf, setvbuf \- ȥ꡼ΥХåե󥰤
.SH 
.nf
.B #include <stdio.h>

.BI "void setbuf(FILE *" stream ", char *" buf );

.BI "void setbuffer(FILE *" stream ", char *" buf ", size_t "  size );

.BI "void setlinebuf(FILE *" stream );

.BI "int setvbuf(FILE *" stream ", char *" buf ", int " mode \
", size_t " size );
.fi
.sp
.in -4n
glibc εǽޥ׷
.RB ( feature_test_macros (7)
):
.in
.sp
.BR setbuffer (),
.BR setlinebuf ():
_BSD_SOURCE
.SH 
Хåե󥰤ˤ unbuffered, block buffered, line buffered 3ĤΥפ
롣ϥȥ꡼Υפ unbuffered ξ硢ǡ񤭹Ȥ˽
ե˽񤭹ޤ뤫ߥʥɽ롣block buffered ξ硢ʸ
ɤ߽񤭤ϥ֥åñ̤Ǥäڤ˹Ԥ롣line buffered ξ硢
ԤϤ뤫ߥʥǥХ³Ƥ륹ȥ꡼
(̾\fIstdin\fP) 鿷ԤϤޤʸ廊롣
֥åŪ˽Ϥˤ
.BR fflush (3)
ؿȤ
.RB ( fclose (3)
򻲾ȤΤ) ̾եϤ٤ block buffered Ǥ롣եФ
ϽԤ
.BR malloc (3)
ƤӽФХåե롣⤷ ȥ꡼ब (̾
.I stdout
Ǥ褦) ߥʥ򻲾Ȥˤϡե line buffered 
ʤ롣ɸ२顼
.I stderr
ϥǥեȤǤϾ unbuffered Ǥ롣
.PP
.BR setvbuf ()
ؿϡץ󤷤ƤǤդΥȥ꡼ФƥХåեѹǤ롣
ѥ᡼
.I mode
ϡ 3 ĤΥޥΤ줫Ǥ:
.RS
.TP
.B _IONBF
unbuffered
.TP
.B _IOLBF
line buffered
.TP
.B _IOFBF
fully buffered
.RE
.PP
unbuffered Υե
.I buf

.I size
ХȰʾ礭ΥХåեؤƤʤФʤʤΥХåեϸߤ
ХåեѤ롣⤷
.I buf
 NULL ʤС⡼ɤѹ롣
Хåեϼɤ߽񤭤ݤ˳Ƥ롣
.BR setvbuf ()
ؿϡȥ꡼򥪡ץ󤷤塢
Υȥ꡼ФƲ餫򤹤ˤΤ߻ѤǤ롣
.PP
¾ 3 Ĥδؿ
.BR setvbuf ()
θƤӽФñ֤뤳ȤǤ롣
.BR setbuf ()
ؿϡ
.PP
.in +4n
setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);

.in
Ʊ
.BR setbuffer ()
ؿϡХåեǥե
.B BUFSIZ
ǤϤʤͿʳƱǤ롣
.BR setlinebuf ()
ؿ
.PP
.in +4n
setvbuf(stream, (char *) NULL, _IOLBF, 0);

.in
ƱǤ롣
.SH ֤
.BR setvbuf ()
ؿϡ 0 ֤
ԤǤդ֤ͤȤ뤬
.I mode
ʾޤϥꥯȤʤϡ0 ʳ֤
.BR setvbuf ()
ؿԤ
.I errno
ꤹ뤳Ȥ⤢롣
¾δؿ֤ͤ void Ǥ롣
.SH 
.BR setbuf ()
ؿ
.BR setvbuf ()
ؿ C89  C99 ˽򤷤Ƥ롣
.SH Х
.BR setbuffer ()
ؿ
.BR setlinebuf ()
ؿ 4.2BSD  BSD Ȥϸߴʤޤ Linux Ǥ(ŤС
Ǥ)ѤǤʤ⤷ʤ4.2BSD  4.3BSD ΥƥǤ
.BR setbuf ()
ɬɲäΥХåեΥѤΤǡȤ٤Ǥʤ
.P
.I stream
Ĥ (ץλݤˤ⤳ϵ) ˤϡ
.I buf
ؤ֤Ȥ¸ߤƤ뤳ȤݾڤʤФʤʤ
.P
㤨СΤ褦ʻȤϵʤ:
.nf
.sp
#include <stdio.h>

int
main(void)
{
    char buf[BUFSIZ];
    setbuf(stdin, buf);
    printf("Hello, world!\\n");
    return 0;
}
.fi
.SH Ϣ
.BR fclose (3),
.BR fflush (3),
.BR fopen (3),
.BR fread (3),
.BR malloc (3),
.BR printf (3),
.BR puts (3)