.\" Copyright (c) 1980, 1991 Regents of the University of California.
.\" All rights reserved.
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.\"	This product includes software developed by the University of
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.\"     @(#)lseek.2	6.5 (Berkeley) 3/10/91
.\"
.\" Modified Fri Jul 23 22:17:00 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified 10 June 1995 by Andries Brouwer <aeb@cwi.nl>
.\" Modified Thu Oct 31 15:18:33 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified Sat Jan 17 13:00:32 MET 1998 by Michael Haardt
.\"   <michael@cantor.informatik.rwth-aachen.de>
.\" Modified Mon Sep 24 16:18:02 CEST 2001 by Michael Haardt <michael@moria.de>
.\"
.\" Japanese Version Copyright (c) 1997-1998 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Sun Feb 23 16:24:36 JST 1997
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified Mon May 11 22:54:50 JST 1998
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated Fri Dec 14 JST 2001 by Kentaro Shirakata <argrath@ub32.org>
.\"
.\"WORD:	offset			եå
.\"WORD:	descriptor		ǥץ
.\"WORD:	pointer			ݥ󥿡
.\"WORD:	end-of-file		եκǸ(end-of-file)
.\"WORD:	socket			å
.\"WORD:	pipe			ѥ
.\"
.TH LSEEK 2 2001-09-24 "Linux" "System calls"
.SH ̾
lseek \- եɤ߽񤭥եåȤΰ֤Ѥ
.SH 
.B #include <sys/types.h>
.br
.B #include <unistd.h>
.sp
.BI "off_t lseek(int " fildes ", off_t " offset ", int " whence );
.SH 
.B lseek
ؿϥեǥץ(descriptor)
.I fildes
ΥեåȤ
.IR  whence 
˽ä
.I offset
ΰ֤ذʲΤ褦ѹ:
.TP
.B SEEK_SET
եåȤ
.I offset
ХȤꤵ롣
.TP
.B SEEK_CUR
եåȤϸ֤߰
.I offset
ХȤ­ͤˤʤ롣
.TP
.B SEEK_END
եåȤϥեΥ
.I offset
ХȤ­ͤˤʤ롣
.PP
.B lseek
ؿϥեåȤ¸ߤեΥեκǸ(end-of-file)
Ķꤹ뤳ȤǤ롣⤷ǡλ˽񤭹ޤ줿
ʤС֤ζʬɤ߹
(ºݤˤ˥ǡ񤭹ޤǤ)ΥХ֤롣
.SH ֤

.B lseek
Ϸ̤Υե֤եƬΥХȿ֤Ǥʤ
ͤȤ (off_t)\-1 ֤
.I errno
˥顼ؼ롣
.SH 顼
.TP
.B EBADF
.I fildes
ץ󤵤줿եǥץǤʤ
.TP
.B ESPIPE
.I fildes
ѥ(pipe), å(socket), FIFO 򻲾ȤƤ롣
.TP
.B EINVAL
.I whence
ͤǤʤ

.SH 
SVr4, POSIX, BSD 4.3
.SH 
ĤΥǥХǤ seek ǤʤPOSIX ǤϤΤ褦
ǥХΥݡȤ׵ᤷƤʤ

Linux ͭ¤Ȥ: tty ǥХ \fBlseek\fP Ѥȡ
\fBESPIPE\fP ֤¾ΥƥǤϽ񤭹ޤ줿ʸο֤
SEEK_SET ǤΥ󥿡Ǥ롣ĤΥǥХ㤨
\fB/dev/null\fP  \fBESPIPE\fP 顼򵯤ʤ֤
ݥ󥿡̤Ǥ롣
.SH 
ʸϤǻѤ
.I whence
ϱѸȤʤ
ŪͳˤݻƤ롣

ŤɤѴ \fIwhence\fP ͤʲΥޥ֤뤳:
.PP
.TS
c c
l l.
old 	new 
0	SEEK_SET
1	SEEK_CUR
2	SEEK_END
L_SET	SEEK_SET
L_INCR	SEEK_CUR
L_XTND	SEEK_END
.TE
.PP
SVR1-3 Ǥ \fBoff_t\fP  \fBlong\fP ֤
BSD Ǥ \fBint\fP ֤
.PP
.BR dup (2)

.BR fork (2)
Ǻ줿եǥץϸߥե֥ݥ
(current file position pointer)ͭƤΤǡ
Τ褦ʥեǰưԤȶ֤ǽ롣
.SH Ϣ
.BR dup (2),
.BR fork (2),
.BR open (2),
.BR fseek (3)