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[linuxjm/LDP_man-pages.git] / release / man2 / lseek.2

.\" Copyright (c) 1980, 1991 Regents of the University of California.
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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 1997-02-23, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified 1998-05-11, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated 2001-12-14, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2003-09-08, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-02-24, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2006-03-05, Akihiro MOTOKI, catch up to LDP v2.25
.\"
.\"WORD:        end-of-file             ¥Õ¥¡¥¤¥ë¤Î½ªÃ¼(end-of-file)
.\"
.TH LSEEK 2 2001-09-24 "Linux" "Linux Programmer's Manual"
.SH ̾Á°
lseek \- ¥Õ¥¡¥¤¥ë¤ÎÆɤ߽ñ¤­¥ª¥Õ¥»¥Ã¥È¤Î°ÌÃÖ¤òÊѤ¨¤ë
.SH ½ñ¼°
.B #include <sys/types.h>
.br
.B #include <unistd.h>
.sp
.BI "off_t lseek(int " fd ", off_t " offset ", int " whence );
.SH ÀâÌÀ
.BR lseek ()
´Ø¿ô¤Ï¡¢¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿ (descriptor)
.I fd
¤ËÂбþ¤¹¤ë¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Î¥ª¥Õ¥»¥Ã¥È¤ò¡¢
.IR  whence
¤Ë´ð¤Å¤­
.I offset
°ú¤­¿ô¤Î°ÌÃ֤ذʲ¼¤Î¤è¤¦¤ËÊѹ¹¤¹¤ë:
.TP
.B SEEK_SET
¥ª¥Õ¥»¥Ã¥È¤Ï
.I offset
¥Ð¥¤¥È¤ËÀßÄꤵ¤ì¤ë¡£
.TP
.B SEEK_CUR
¥ª¥Õ¥»¥Ã¥È¤Ï¸½ºß°ÌÃÖ¤Ë
.I offset
¥Ð¥¤¥È¤ò­¤·¤¿°ÌÃ֤ˤʤ롣
.TP
.B SEEK_END
¥ª¥Õ¥»¥Ã¥È¤Ï¥Õ¥¡¥¤¥ë¤Î¥µ¥¤¥º¤Ë
.I offset
¥Ð¥¤¥È¤ò­¤·¤¿°ÌÃ֤ˤʤ롣
.PP
.BR lseek ()
´Ø¿ô¤Ï¡¢¥ª¥Õ¥»¥Ã¥È¤ò¥Õ¥¡¥¤¥ë¤ÎËöÈø¤ò±Û¤¨¤¿°ÌÃÖ¤ËÀßÄê¤Ç¤­¤ë
(⤷¡¢¤³¤ì¤Ë¤è¤ê¥Õ¥¡¥¤¥ë¤Î¥µ¥¤¥º¤¬ÊѤï¤é¤Ê¤¤)¡£
¤â¤·¥Ç¡¼¥¿¤¬¤³¤Î¥ª¥Õ¥»¥Ã¥È°ÌÃְʹߤ˽ñ¤­¹þ¤Þ¤ì¤¿¾ì¹ç¡¢
´Ö¤Î¶õ·ä¤ÎÉôʬ ("·ê (hole)") ¤ÎÆɤ߽Ф·¤¬¤¢¤ë¤È¡¢
¼ÂºÝ¤Ë¤½¤³¤Ë¥Ç¡¼¥¿¤ò½ñ¤­¹þ¤Þ¤ì¤ë¤Þ¤Ç¤Ï
NULL ¥Ð¥¤¥È (\(aq\\0\(aq) ¤ÎÎó¤¬ÊÖ¤µ¤ì¤ë¡£
.SH ÊÖ¤êÃÍ
À®¸ù¤·¤¿¾ì¹ç¡¢
.BR lseek ()
¤Ï·ë²Ì¤Î¥Õ¥¡¥¤¥ë°ÌÃÖ¤ò¥Õ¥¡¥¤¥ë¤ÎÀèƬ¤«¤é¤Î¥Ð¥¤¥È¿ô¤ÇÊÖ¤¹¡£
¥¨¥é¡¼¤Î¾ì¹ç¡¢ÃͤȤ·¤Æ \fI(off_t)\ \-1\fP ¤òÊÖ¤·¡¢
.I errno
¤Ë¥¨¥é¡¼¤¬»Ø¼¨¤µ¤ì¤ë¡£
.SH ¥¨¥é¡¼
.TP
.B EBADF
.I fd
¤¬¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤Ê¤¤¡£
.TP
.B EINVAL
.I whence
¤¬
.BR SEEK_SET ,
.BR SEEK_CUR ,
.B SEEK_END
¤Î¤É¤ì¤Ç¤â¤Ê¤¤¡£
¤Þ¤¿¤Ï¡¢seek ¤Î·ë²Ì¡¢¥Õ¥¡¥¤¥ë¡¦¥ª¥Õ¥»¥Ã¥È¤¬Éé¤Ë¤Ê¤Ã¤Æ¤·¤Þ¤¦¤«¡¢
seek ²Äǽ¤Ê¥Ç¥Ð¥¤¥¹¤ÎËöÈø¤ò±Û¤¨¤Æ¤·¤Þ¤¦¡£
.\" ¥·¥¹¥Æ¥à¤Ë¤è¤Ã¤Æ¤Ï¥­¥ã¥é¥¯¥¿¥Ç¥Ð¥¤¥¹¤ä¥ê¥â¡¼¥È¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ËÂФ·¤Æ
.\" Éé¤Î¥ª¥Õ¥»¥Ã¥È¤¬µö¤µ¤ì¤ë¤«¤â¤·¤ì¤Ê¤¤¡£
.B EOVERFLOW
.\" ¤³¤Î¾ì¹ç HP-UX 11 ¤Ï EINVAL ¤òÊÖ¤¹ (°ìÊý¡¢POSIX.1 ¤Ï EOVERFLOW ¤òÊÖ¤¹)
·ë²Ì¤Î¥Õ¥¡¥¤¥ë¡¦¥ª¥Õ¥»¥Ã¥È¤ò
.I off_t
·¿¤Çɽ¸½¤¹¤ë¤³¤È¤¬¤Ç¤­¤Ê¤¤¡£
.TP
.B ESPIPE
.I fd
¤¬¥Ñ¥¤¥×¡¢¥½¥±¥Ã¥È¡¢FIFO ¤ò»²¾È¤·¤Æ¤¤¤ë¡£
.SH ½àµò
SVr4, 4.3BSD, POSIX.1-2001.
.SH Ãí°Õ
¤³¤Îʸ¾Ï¤Ç»ÈÍѤ·¤¿
.I whence
¤Ï±Ñ¸ì¤È¤·¤ÆÀµ¤·¤¯¤Ê¤¤¤¬¡¢
Îò»ËŪÍýͳ¤Ë¤è¤ê¤½¤Î¤Þ¤Þ»È¤ï¤ì¤Æ¤¤¤ë¡£

¤¤¤¯¤Ä¤«¤Î¥Ç¥Ð¥¤¥¹¤Ç¤Ï seek ¤¬¤Ç¤­¤Ê¤¤¡£
POSIX ¤Ï¤É¤Î¥Ç¥Ð¥¤¥¹¤¬
.BR lseek ()
¤ËÂбþ¤¹¤Ù¤­¤«¤Ïµ¬Äꤷ¤Æ¤¤¤Ê¤¤¡£

Linux ¤Ç¤Ï¡¢ tty ¥Ç¥Ð¥¤¥¹¤Ë
.BR lseek ()
¤ò»ÈÍѤ¹¤ë¤È
\fBESPIPE\fP ¤òÊÖ¤¹¡£
.\" ¾¤Î¥·¥¹¥Æ¥à¤Ç¤Ï½ñ¤­¹þ¤Þ¤ì¤¿Ê¸»ú¤Î¿ô¤òÊÖ¤·¡¢
.\" SEEK_SET ¤òÍѤ¤¤Æ¥«¥¦¥ó¥¿¤òÀßÄꤹ¤ë¡£ (½ñ¤­¹þ¤Þ¤ì¤¿Ê¸»ú¤Î¡£)

¸Å¤¤¥³¡¼¥É¤òÊÑ´¹¤¹¤ë»þ¤Ï \fIwhence\fP ¤ÎÃͤò°Ê²¼¤Î¥Þ¥¯¥í¤ËÃÖ¤­´¹¤¨¤ë¤³¤È:
.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
ÊÖ¤êÃͤη¿¤Ï¡¢SVr1-3 ¤Ç¤Ï \fIoff_t\fP ¤Ç¤Ï¤Ê¤¯ \fIlong\fP ¤Ç¤¢¤ê¡¢
BSD ¤Ç¤Ï \fIint\fP ¤Ç¤¢¤ë¡£
.PP
.BR dup (2)
¤ä
.BR fork (2)
¤ÇºîÀ®¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ï¡¢¸½ºß¤Î¥Õ¥¡¥¤¥ë°ÌÃ֥ݥ¤¥ó¥¿
(current file position pointer) ¤ò¶¦Í­¤·¤Æ¤¤¤ë¤Î¤Ç¡¢
¤³¤Î¤è¤¦¤Ê¥Õ¥¡¥¤¥ë¤Ç°ÜÆ°¤ò¹Ô¤¦¤È¶¥¹ç¾õÂÖ¤ò°ú¤­µ¯¤³¤¹²ÄǽÀ­¤¬¤¢¤ë¡£
.SH ´ØÏ¢¹àÌÜ
.BR dup (2),
.BR fork (2),
.BR open (2),
.BR fseek (3),
.BR lseek64 (3),
.BR posix_fallocate (3)