139 lines
4.2 KiB
Groff
139 lines
4.2 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)lseek.2 8.3 (Berkeley) 4/19/94
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.\" %FreeBSD: src/lib/libc/sys/lseek.2,v 1.21 2004/07/02 23:52:13 ru Exp %
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.\"
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.\" $FreeBSD$
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.Dd April 19, 1994
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.Dt LSEEK 2
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.Os
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.Sh ̾¾Î
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.Nm lseek
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.Nd Æɼè¤ê / ½ñ¹þ¤ß¥Õ¥¡¥¤¥ë¥ª¥Õ¥»¥Ã¥È°ÌÃÖ¤òÊѹ¹¤¹¤ë
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.Sh ¥é¥¤¥Ö¥é¥ê
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.Lb libc
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.Sh ½ñ¼°
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.In unistd.h
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.Ft off_t
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.Fn lseek "int fildes" "off_t offset" "int whence"
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.Sh ²òÀâ
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.Fn lseek
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢¥Ç¥£¥ì¥¯¥Æ¥£¥Ö
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.Fa whence
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¤Ë½¾¤Ã¤Æ¥Õ¥¡¥¤¥ëµ½Ò»Ò
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.Fa fildes
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¤Î¥ª¥Õ¥»¥Ã¥È¤ò°ú¿ô
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.Fa offset
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¤Ë°ÜÆ°¤·¤Þ¤¹¡£
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°ú¿ô
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.Fa fildes
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¤Ï¥ª¡¼¥×¥ó¥Õ¥¡¥¤¥ëµ½Ò»Ò¤Ç¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£
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.Fn lseek
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢¼¡¤Î¤è¤¦¤Ë¥Õ¥¡¥¤¥ëµ½Ò»Ò
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.Fa fildes
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¤ËÂбþ¤¹¤ë¥Õ¥¡¥¤¥ë°ÌÃ֥ݥ¤¥ó¥¿¤ò°ÜÆ°¤·¤Þ¤¹:
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.Bl -item -offset indent
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.It
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.Fa whence
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¤¬
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.Dv SEEK_SET
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¤Î¾ì¹ç¡¢¥ª¥Õ¥»¥Ã¥È¤Ï
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.Fa offset
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¥Ð¥¤¥È¤ËÀßÄꤵ¤ì¤Þ¤¹¡£
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.It
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.Fa whence
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¤¬
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.Dv SEEK_CUR
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¤Î¾ì¹ç¡¢¥ª¥Õ¥»¥Ã¥È¤Ï¸½ºß¤Î°ÌÃÖ¤Ë
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.Fa offset
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¥Ð¥¤¥È¤ò²Ã»»¤·¤¿¤â¤Î¤ËÀßÄꤵ¤ì¤Þ¤¹¡£
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.It
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.Fa whence
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¤¬
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.Dv SEEK_END
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¤Î¾ì¹ç¡¢¥ª¥Õ¥»¥Ã¥È¤Ï¥Õ¥¡¥¤¥ë¤Î¥µ¥¤¥º¤Ë
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.Fa offset
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¥Ð¥¤¥È¤ò²Ã»»¤·¤¿¤â¤Î¤Ë¤Ê¤ê¤Þ¤¹¡£
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.El
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.Pp
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.Fn lseek
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ë¤è¤Ã¤Æ¡¢¥Õ¥¡¥¤¥ë¥ª¥Õ¥»¥Ã¥È¤ò¥Õ¥¡¥¤¥ë¤Î´û¸¤Î¥Õ¥¡¥¤¥ë¤Î
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½ª¤ê (EOF) ¤ò±Û¤¨¤ë¤È¤³¤í¤ËÀßÄê¤Ç¤¤Þ¤¹¡£
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¸å¤Ë¥Ç¡¼¥¿¤¬¤³¤ÎÅÀ¤Ë½ñ¤¹þ¤Þ¤ì¤ë¤È¡¢
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¤½¤ì°Ê¸å¤Î¥®¥ã¥Ã¥×Æâ¤Î¥Ç¡¼¥¿¤ËÂФ¹¤ëÆɼè¤ê¤Ï
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(¥Ç¡¼¥¿¤¬¼ÂºÝ¤Ë¥®¥ã¥Ã¥×Æâ¤Ë½ñ¤¹þ¤Þ¤ì¤ë¤Þ¤Ç) ¥Ç¡¼¥¿¤È¤·¤Æ 0 ¤òÊÖ¤·¤Þ¤¹¡£
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.Pp
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¥·¡¼¥¯¤Ç¤¤Ê¤¤¥Ç¥Ð¥¤¥¹¤â¤¢¤ê¤Þ¤¹¡£
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¤½¤Î¤è¤¦¤Ê¥Ç¥Ð¥¤¥¹¤ËÂбþ¤¹¤ë¥Ý¥¤¥ó¥¿¤ÎÃͤÏ̤ÄêµÁ¤Ë¤Ê¤ê¤Þ¤¹¡£
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.Sh Ìá¤êÃÍ
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½èÍý¤¬Àµ¾ï¤Ë´°Î»¤¹¤ë¤È
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.Fn lseek
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¤Ï¡¢¥Õ¥¡¥¤¥ë¤ÎÀèƬ¤«¤é¬Äꤷ¤¿·ë²Ì¤Î¥ª¥Õ¥»¥Ã¥È°ÌÃÖ¤ò¥Ð¥¤¥Èñ°Ì¤ÇÊÖ¤·¤Þ¤¹¡£
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¤½¤¦¤Ç¤Ê¤¤¾ì¹ç¤Ï -1 ¤¬ÊÖ¤µ¤ì¡¢¥¨¥é¡¼¤ò¼¨¤¹¤¿¤á¤Ë
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.Va errno
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¤¬ÀßÄꤵ¤ì¤Þ¤¹¡£
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.Sh ¥¨¥é¡¼
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.Fn lseek
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¼¡¤Î¾ì¹ç¤Ë½èÍý¤ò¼ºÇÔ¤·¡¢¥Õ¥¡¥¤¥ë°ÌÃ֥ݥ¤¥ó¥¿¤ÏÊѹ¹¤µ¤ì¤Þ¤»¤ó:
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.Bl -tag -width Er
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.It Bq Er EBADF
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.Fa fildes
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°ú¿ô¤¬¥ª¡¼¥×¥ó¥Õ¥¡¥¤¥ëµ½Ò»Ò¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó¡£
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.It Bq Er EINVAL
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.Fa whence
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°ú¿ô¤¬Àµ¤·¤¤ÃͤǤϤʤ¤¤«¡¢·×»»·ë²Ì¤Î¥Õ¥¡¥¤¥ë¥ª¥Õ¥»¥Ã¥È¤¬
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¥¥ã¥é¥¯¥¿·¿¤Ç¤Ï¤Ê¤¤Æüì¥Õ¥¡¥¤¥ë¤Ë»È¤¦Éé¤ÎÃͤȤʤê¤Þ¤·¤¿¡£
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.It Bq Er EOVERFLOW
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·×»»·ë²Ì¤Î¥Õ¥¡¥¤¥ë¥ª¥Õ¥»¥Ã¥È¤¬¡¢
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.Fa off_t
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·¿¤Î¥ª¥Ö¥¸¥§¥¯¥È¤Ç¤ÏÀµ¤·¤¯É½¸½¤Ç¤¤Ê¤¤ÃͤȤʤê¤Þ¤·¤¿¡£
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.It Bq Er ESPIPE
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.Fa fildes
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°ú¿ô¤Ï¥Ñ¥¤¥×¡¢¥½¥±¥Ã¥È¡¢¤Þ¤¿¤Ï FIFO ¤ÈÂбþ¤Å¤±¤é¤ì¤Æ¤¤¤Þ¤¹¡£
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.El
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.Sh ´ØÏ¢¹àÌÜ
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.Xr dup 2 ,
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.Xr open 2
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.Sh ¥Ð¥°
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¤³¤Î¥É¥¥å¥á¥ó¥È¤Î
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.Fa whence
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¤Î»ÈÍÑË¡¤ÏÀµ¤·¤¯¤Ê¤¤±Ñ¸ì¤Ç¤¹¤¬¡¢Îò»ËŪ¤ÊÍýͳ¤Ç°Ý»ý¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
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.Sh µ¬³Ê
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.Fn lseek
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï
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.St -p1003.1-90
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¤ËŬ¹ç¤·¤Æ¤¤¤Þ¤¹¡£
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.Sh Îò»Ë
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.Fn lseek
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´Ø¿ô¤Ï
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.At v7
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¤ÇÅо줷¤Þ¤·¤¿¡£
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