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[linuxjm/jm.git] / manual / LDP_man-pages / release / man3 / setbuf.3

.\"
.\" 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  2008-06-26 "Linux" "Linux Programmer's Manual"
.SH ̾Á°
setbuf, setbuffer, setlinebuf, setvbuf \- ¥¹¥È¥ê¡¼¥à¤Î¥Ð¥Ã¥Õ¥¡¥ê¥ó¥°¤ÎÁàºî
.SH ½ñ¼°
.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 ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
.RB ( feature_test_macros (7)
»²¾È):
.in
.sp
.BR setbuffer (),
.BR setlinebuf ():
_BSD_SOURCE
.SH ÀâÌÀ
¥Ð¥Ã¥Õ¥¡¥ê¥ó¥°¤Ë¤Ï unbuffered, block buffered, line buffered ¤Î3¤Ä¤Î¥¿¥¤¥×¤¬
¤¢¤ë¡£½ÐÎÏ¥¹¥È¥ê¡¼¥à¤Î¥¿¥¤¥×¤¬ unbuffered ¤Î¾ì¹ç¡¢¥Ç¡¼¥¿¤ò½ñ¤­¹þ¤à¤È¤¹¤°¤Ë½Ð
ÎÏÀè¥Õ¥¡¥¤¥ë¤Ë½ñ¤­¹þ¤Þ¤ì¤ë¤«¥¿¡¼¥ß¥Ê¥ë¤Ëɽ¼¨¤µ¤ì¤ë¡£block buffered ¤Î¾ì¹ç¡¢Ê¸
»ú¤ÎÆɤ߽ñ¤­¤Ï¥Ö¥í¥Ã¥¯Ã±°Ì¤Ç¤¤¤Ã¤Ú¤ó¤Ë¹Ô¤ï¤ì¤ë¡£line buffered ¤Î¾ì¹ç¡¢
¿·¤·¤¤¹Ô¤¬½ÐÎϤµ¤ì¤ë¤«¡¢¥¿¡¼¥ß¥Ê¥ë¥Ç¥Ð¥¤¥¹¤ËÀܳ¤·¤Æ¤¤¤ë¥¹¥È¥ê¡¼¥à
(Ä̾\fIstdin\fP) ¤«¤é¿·¤·¤¤¹Ô¤¬ÆþÎϤµ¤ì¤ë¤Þ¤Çʸ»ú¤¬¤¿¤¯¤ï¤¨¤é¤ì¤ë¡£
¥Ö¥í¥Ã¥¯¤ò¶¯À©Åª¤Ë½ÐÎϤ¹¤ë¤Ë¤Ï
.BR fflush (3)
´Ø¿ô¤ò»È¤¦¡£
.RB ( fclose (3)
¤ò»²¾È¤Î¤³¤È) Ä̾¥Õ¥¡¥¤¥ë¤Ï¤¹¤Ù¤Æ block buffered ¤Ç¤¢¤ë¡£¥Õ¥¡¥¤¥ë¤ËÂФ·¤Æ
½é¤á¤ÆÆþ½ÐÎϽèÍý¤ò¹Ô¤¦¤È
.BR malloc (3)
¤¬¸Æ¤Ó½Ð¤µ¤ì¥Ð¥Ã¥Õ¥¡¤¬³ÍÆÀ¤µ¤ì¤ë¡£¤â¤· ¥¹¥È¥ê¡¼¥à¤¬ (Ä̾
.I stdout
¤¬¤½¤¦¤Ç¤¢¤ë¤è¤¦¤Ë) ¥¿¡¼¥ß¥Ê¥ë¤ò»²¾È¤¹¤ë¾ì¹ç¤Ë¤Ï¡¢¥Õ¥¡¥¤¥ë¤Ï line buffered ¤È
¤Ê¤ë¡£É¸½à¥¨¥é¡¼½ÐÎÏ
.I stderr
¤Ï¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¾ï¤Ë unbuffered ¤Ç¤¢¤ë¡£
.PP
.BR setvbuf ()
´Ø¿ô¤Ï¡¢¥ª¡¼¥×¥ó¤·¤Æ¤¤¤ëǤ°Õ¤Î¥¹¥È¥ê¡¼¥à¤ËÂФ·¤Æ¥Ð¥Ã¥Õ¥¡¤òÊѹ¹¤Ç¤­¤ë¡£
°ú¤­¿ô
.I mode
¤Ï¡¢¼¡¤Î 3 ¤Ä¤Î¥Þ¥¯¥í¤Î¤¦¤Á¤¤¤º¤ì¤«¤Ç¤¢¤ë:
.RS
.TP
.B _IONBF
unbuffered
.TP
.B _IOLBF
line buffered
.TP
.B _IOFBF
fully buffered
.RE
.PP
unbuffered ¤Î¥Õ¥¡¥¤¥ë¤ò½ü¤­¡¢
.I buf
°ú¿ô¤Ï
.I size
¥Ð¥¤¥È°Ê¾å¤ÎÂ礭¤µ¤Î¥Ð¥Ã¥Õ¥¡¤ò»Ø¤·¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£¤³¤Î¥Ð¥Ã¥Õ¥¡¤Ï¸½ºß¤Î
¥Ð¥Ã¥Õ¥¡¤ÎÂå¤ï¤ê¤ËÍѤ¤¤é¤ì¤ë¡£¤â¤·¡¢°ú¿ô
.I buf
¤¬ NULL ¤Ê¤é¤Ð¡¢¥â¡¼¥É¤À¤±¤¬Êѹ¹¤µ¤ì¤ë¡£
¿·¤·¤¤¥Ð¥Ã¥Õ¥¡¤Ï¼¡¤ËÆɤ߽ñ¤­¤·¤¿ºÝ¤Ë³ä¤êÅö¤Æ¤é¤ì¤ë¡£
.BR setvbuf ()
´Ø¿ô¤Ï¡¢¥¹¥È¥ê¡¼¥à¤ò¥ª¡¼¥×¥ó¤·¤¿¸å¡¢
¤½¤Î¥¹¥È¥ê¡¼¥à¤ËÂФ·¤Æ²¿¤é¤«¤ÎÁàºî¤ò¤¹¤ëÁ°¤Ë¤Î¤ß»ÈÍѤǤ­¤ë¡£
.PP
¾¤Î 3 ¤Ä¤Î´Ø¿ô¤Ï
.BR setvbuf ()
¤Î¸Æ¤Ó½Ð¤·¤Ëñ½ã¤ËÃÖ¤­´¹¤¨¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.BR setbuf ()
´Ø¿ô¤Ï¡¢
.PP
.in +4n
setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);

.in
¤ÈÁ´¤¯Æ±Åù¤À¤·¡¢
.BR setbuffer ()
´Ø¿ô¤Ï¡¢¥Ð¥Ã¥Õ¥¡¥µ¥¤¥º¤¬¥Ç¥Õ¥©¥ë¥ÈÃÍ
.B BUFSIZ
¤Ç¤Ï¤Ê¤¯°ú¿ô¤ÇÍ¿¤¨¤é¤ì¤ëÅÀ°Ê³°¤ÏƱ¤¸¤Ç¤¢¤ë¡£
.BR setlinebuf ()
´Ø¿ô¤Ï
.PP
.in +4n
setvbuf(stream, (char *) NULL, _IOLBF, 0);

.in
¤ÈƱ¤¸¤Ç¤¢¤ë¡£
.SH ÊÖ¤êÃÍ
.BR setvbuf ()
´Ø¿ô¤Ï¡¢À®¸ù¤·¤¿¾ì¹ç 0 ¤òÊÖ¤¹¡£
¼ºÇÔ¤·¤¿¾ì¹ç¡¢0 °Ê³°¤ÎÃͤòÊÖ¤¹
(¼ºÇԤȤϡ¢
.I mode
¤¬ÉÔÀµ¤Ê¾ì¹ç¤Þ¤¿¤Ï¥ê¥¯¥¨¥¹¥È¤¬¾ò·ï¤òËþ¤¿¤µ¤Ê¤¤¾ì¹ç¤Ç¤¢¤ë)¡£
.BR setvbuf ()
´Ø¿ô¤¬¼ºÇÔ¤·¤¿¾ì¹ç¤Ï
.I errno
¤òÀßÄꤹ¤ë¤³¤È¤â¤¢¤ë¡£

¤½¤Î¾¤Î´Ø¿ô¤ÏÃͤòÊÖ¤µ¤Ê¤¤¡£
.SH ½àµò
.BR setbuf ()
´Ø¿ô¤ª¤è¤Ó
.BR setvbuf ()
´Ø¿ô¤Ï C89 ¤È C99 ¤Ë½àµò¤·¤Æ¤¤¤ë¡£
.SH ¥Ð¥°
.BR setbuffer ()
´Ø¿ô¤ª¤è¤Ó
.BR setlinebuf ()
´Ø¿ô¤Ï 4.2BSD ¤è¤êÁ°¤Î BSD ¤È¤Ï¸ß´¹À­¤¬¤Ê¤¤¡£¤Þ¤¿ Linux ¤Ç¤â(¸Å¤¤¥Ð¡¼¥¸¥ç¥ó
¤Ç¤Ï)ÍøÍѤǤ­¤Ê¤¤¤«¤â¤·¤ì¤Ê¤¤¡£4.2BSD ¤ª¤è¤Ó 4.3BSD ¤Î¥·¥¹¥Æ¥à¤Ç¤Ï
.BR setbuf ()
¤Ïɬ¤ºÄɲäΥХåե¡¡¼¤Î¥µ¥¤¥º¤ò»ÈÍѤ¹¤ë¤Î¤Ç¡¢¤³¤ì¤â»È¤¦¤Ù¤­¤Ç¤Ê¤¤¡£
.P
.I stream
¤òÊĤ¸¤ë»þ (¥×¥í¥°¥é¥à¤ò½ªÎ»¤¹¤ëºÝ¤Ë¤â¤³¤ì¤Ïµ¯¤­¤ë) ¤Ë¤Ï¡¢
.I buf
¤¬»Ø¤·¼¨¤¹¶õ´Ö¤È¤¬Â¸ºß¤·¤Æ¤¤¤ë¤³¤È¤òÊݾڤ·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
Î㤨¤Ð¡¢¼¡¤Î¤è¤¦¤Ê»È¤¤Êý¤Ïµö¤µ¤ì¤Ê¤¤:
.nf
.sp
#include <stdio.h>

int
main(void)
{
    char buf[BUFSIZ];
    setbuf(stdin, buf);
    printf("Hello, world!\\n");
    return 0;
}
.fi
.SH ´ØÏ¢¹àÌÜ
.BR fclose (3),
.BR fflush (3),
.BR fopen (3),
.BR fread (3),
.BR malloc (3),
.BR printf (3),
.BR puts (3)