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.\"     @(#)truncate.2	6.9 (Berkeley) 3/10/91
.\"
.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1996-10-22 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 1998-12-21 by Andries Brouwer <aeb@cwi.nl>
.\" Modified 2002-01-07 by Michael Kerrisk <mtk-manpages@gmx.net>
.\" Modified 2002-04-06 by Andries Brouwer <aeb@cwi.nl>
.\" Modified 2004-06-23 by Michael Kerrisk <mtk-manpages@gmx.net>
.\"
.\" Japanese Version Copyright (c) 1997 SUTO, Mitsuaki
.\"         all rights reserved.
.\" Translated Thu Jun 26 21:14:31 JST 1997
.\"         by SUTO, Mitsuaki <suto@av.crl.sony.co.jp>
.\" Modified Sun Mar 12 16:46:31 JST 2000
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated Jan  9 JST 2001 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated Apr 13 JST 2002 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated Oct 21 JST 2002 by Kentaro Shirakata <argrath@ub32.org>
.\"
.TH TRUNCATE 2 2004-06-23 "Linux 2.6.7" "Linux Programmer's Manual"
.SH ̾
truncate, ftruncate \- ꤷĹ˥եڤͤ
.SH 
.B #include <unistd.h>
.br
.B #include <sys/types.h>
.sp
.BI "int truncate(const char *" path ", off_t " length );
.br
.BI "int ftruncate(int " fd ", off_t " length );
.SH 
.B truncate

.I path
ǻꤵե
.B ftruncate

.I fd
ǻȤե
.I length
ХȤĹˤʤ褦˱Ĺ롢⤷ڤͤ롣
⤷ڤͤΥե뤬
.I length
ĹСlength ХȤۤʬΥǡϼ롣
⤷ڤͤΥե뤬
.I length
ûСĥ롣
ĥ줿ʬɤϥ֤롣
.LP
եݥ󥿤ѹʤ
.LP
Ĺѹȡե ctime  mtime Υեɤ
롣ޤsuid  sgid ΥӥåȤꥢ뤫⤷ʤ
.LP
.B ftruncate
ξ硢եϽ񤭹Ѥ˳ƤʤФʤʤ
.B truncate
ξ硢եϽ񤭹߲ǽǤʤФʤʤ
.SH ֤
 0 ֤롣Ԥ \-1 ֤ꡢ
.I errno
顼Ƥ˽äꤵ롣
.SH 顼
.B truncate 
ǤϰʲΥ顼ɤƤ롣
.TP
.B EACCES
(See also
.BR path_resolution (2).)
ѥǻꤵƤǥ쥯ȥ˸ĤΤʤΤ
(:x ӥåȤΩäƤʤ)
뤤ϡꤵ줿եФ񤭹ߵĤäƤʤ
.RB ( path_resolution (2)
⻲ȤΤ)
.TP
.B EFAULT
.I path
ץ˳ƤƤ륢ɥ쥹֤γؤƤ롣
.TP
.B EFBIG

.I length
ե륵礭(XSI)
.TP
.B EINTR
¹˥ʥ
.TP
.B EINVAL

.I length
Ǥ뤫ե륵礭
.TP
.B EIO
inode ι I/O 顼ȯ
.TP
.B EISDIR
ꤵ줿եϥǥ쥯ȥǤ롣
.TP
.B ELOOP
ѥ᤹̾ݤ˥ܥå󥯤¿
.TP
.B ENAMETOOLONG
ѥ̾Υǥ쥯ȥ̾ 255 ʸۤƤ롢⤷ϥѥ̾Τ 
1023 ʸۤƤ롣
.TP
.B ENOENT
ꤵ줿̾Υե뤬¸ߤʤ
.TP
.B ENOTDIR
ѥ̾ιܤ˥ǥ쥯ȥǤϤʤΤäƤ롣
.TP
.B EROFS
ꤵ줿եɤ߽ФѤΥե륷ƥˤ롣
.TP
.B ETXTBSY
ꤵ줿եϼ¹ԤƤեǤ롣
.PP
.B ftruncate 
ǤƱͤΥ顼ŬѤ롣
â
.I path
꤬륨顼ξ
.I fd
꤬륨顼Ȥʤ롣
.TP
.B EBADF
.I fd
̵ʥǥץ(descripter)Ǥ롣
.TP
.BR EBADF ޤ EINVAL
.I fd
 ǻꤵƤΤ񤭹ߥ⡼ɤdzƤʤ
.SH 
4.4BSD, SVr4 (δؿ BSD 4.2 ˽ƻȤ줿)
POSIX 1003.1-1996 ˤ
.B ftruncate
롣
POSIX 1003.1-2001 ˤ
XSI ĥȤ
.B truncate
⤢롣
.LP
SVr4 ˤ¾Υ顼ɤȤơ
.B truncate
ˤ EMFILE, EMULTIHP, ENFILE, ENOLINK 
.B ftruncate
ˤ EAGAIN 줾쵭ҤƤ롣
.SH 
嵭εҤ XSI ΥƥΤΤǤ롣
XSI Υƥξ硢POSIX ɸ
.B ftruncate
Ф
.I length
եĹĹä硢
顼֤եĥ뤫ĤưƤƤ롣
.B truncate
ФƤꤵƤʤ
ʤۤȤɤ UNIX  XSI ׵Ƥ롣
.SH Ϣ
.BR open (2),
.BR path_resolution (2)