doc/ja_JP.eucJP/man/man2/flock.2

.\" Copyright (c) 1983, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 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.
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.\" 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
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.\"
.\"     @(#)flock.2	8.2 (Berkeley) 12/11/93
.\" %FreeBSD: src/lib/libc/sys/flock.2,v 1.8.2.4 2000/12/29 14:44:52 ru Exp %
.\"
.Dd December 11, 1993
.Dt FLOCK 2
.Os BSD 4.2
.Sh ̾¾Î
.Nm flock
.Nd "³«¤¤¤¿¥Õ¥¡¥¤¥ë¾å¤ÎÌä¹ç¤»·¿¥í¥Ã¥¯¤òŬÍѤޤ¿¤Ï½üµî¤¹¤ë"
.Sh ¥é¥¤¥Ö¥é¥ê
.Lb libc
.Sh ½ñ¼°
.Fd #include <sys/file.h>
.Fd "#define	LOCK_SH		0x01		/* ¶¦Í­¥Õ¥¡¥¤¥ë¥í¥Ã¥¯ */"
.Fd "#define	LOCK_EX		0x02		/* ÇÓ¾Ū¥Õ¥¡¥¤¥ë¥í¥Ã¥¯ */"
.Fd "#define	LOCK_NB		0x04		/* ¥í¥Ã¥¯¤¹¤ë¤È¤­¤Ë¥Ö¥í¥Ã¥¯¤·¤Ê¤¤ */"
.Fd "#define	LOCK_UN		0x08		/* ¥Õ¥¡¥¤¥ë¤ò¥¢¥ó¥í¥Ã¥¯¤¹¤ë */"
.Ft int
.Fn flock "int fd" "int operation"
.Sh ²òÀâ
flock()
¤Ï¡¢¥Õ¥¡¥¤¥ëµ­½Ò»Ò
.Fa fd
¤ËÂбþ¤¹¤ë¥Õ¥¡¥¤¥ë¾å¤Î
.Em Ìä¹ç¤»·¿
¥í¥Ã¥¯¤òŬÍѤޤ¿¤Ï½üµî¤·¤Þ¤¹¡£
¥í¥Ã¥¯¤òŬÍѤ¹¤ë¤Ë¤Ï¡¢¥Ñ¥é¥á¡¼¥¿¤Î
.Fa operation
¤Ë
.Dv LOCK_SH
¤Þ¤¿¤Ï
.Dv LOCK_EX
¤Î¤¤¤º¤ì¤«¤È¡¢É¬ÍפǤ¢¤ì¤Ð
.Dv LOCK_NB
¤ò²Ã¤¨¤Æ»ØÄꤷ¤Þ¤¹¡£
´û¸¤Î¥í¥Ã¥¯¤ò¥¢¥ó¥í¥Ã¥¯¤¹¤ë¾ì¹ç¤Ï
.Dv operation
¤ò
.Dv LOCK_UN
¤Ë¤·¤Æ¤¯¤À¤µ¤¤¡£
.Pp
Ìä¹ç¤»·¿¥í¥Ã¥¯¤Ï¡¢¶¨Æ±¤¹¤ë¥×¥í¥»¥¹´Ö¤Ç¤Î°ì´Ó¤·¤¿¥Õ¥¡¥¤¥ëÁàºî¤ò
²Äǽ¤Ë¤·¤Þ¤¹¤¬¡¢¥Õ¥¡¥¤¥ë¤Î°ì´ÓÀ­¤òÊݾڤ¹¤ë
¤â¤Î¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó (¤¹¤Ê¤ï¤Á¡¢¥×¥í¥»¥¹¤ÏÌä¹ç¤»·¿¥í¥Ã¥¯¤ò»ÈÍѤ»¤º¤Ë
¥Õ¥¡¥¤¥ë¤Ë¥¢¥¯¥»¥¹¤Ç¤­¤ë¤Î¤Ç¡¢¤½¤Î·ë²Ì°ì´ÓÀ­¤¬¤Ê¤¯¤Ê¤ë²ÄǽÀ­¤¬¤¢¤ê¤Þ¤¹)¡£
.Pp
¥í¥Ã¥¯¥á¥«¥Ë¥º¥à¤Ï
.Em ¶¦Í­
¥í¥Ã¥¯¤È
.Em ÇÓ¾Ū
¥í¥Ã¥¯¤È¤¤¤¦ 2 ¤Ä¤Î¥¿¥¤¥×¤Î¥í¥Ã¥¯¤òÄ󶡤·¤Þ¤¹¡£
¤¤¤Ä¤Ç¤âÊ£¿ô¤Î¶¦Í­¥í¥Ã¥¯¤ò 1 ¤Ä¤Î¥Õ¥¡¥¤¥ë¤ËŬÍѤǤ­¤Þ¤¹¡£¤·¤«¤·¡¢
Ʊ»þ¤Ë 1 ¤Ä¤Î¥Õ¥¡¥¤¥ë¤ËÊ£¿ô¤ÎÇÓ¾Ū¥í¥Ã¥¯¡¢
¤Þ¤¿¤Ï¶¦Í­¥í¥Ã¥¯¤ÈÇÓ¾Ū¥í¥Ã¥¯¤ÎξÊý¤òŬÍѤ¹¤ë¤³¤È¤Ï¤Ç¤­¤Þ¤»¤ó¡£
.Pp
ŬÀڤʥí¥Ã¥¯¤Î¥¿¥¤¥×¤ò»ØÄꤹ¤ë¤À¤±¤Ç¡¢¶¦Í­¥í¥Ã¥¯¤ÏÇÓ¾Ū¥í¥Ã¥¯¤Ë
.Em ¥¢¥Ã¥×¥°¥ì¡¼¥É
¤Ç¤­¡¢ÇÓ¾Ū¥í¥Ã¥¯¤ò¶¦Í­¥í¥Ã¥¯¤Ë
.Em ¥À¥¦¥ó¥°¥ì¡¼¥É
¤Ç¤­¤Þ¤¹¡£
¤½¤Î·ë²Ì¤È¤·¤ÆÁ°¤Î¥í¥Ã¥¯¤Ï²òÊü¤µ¤ì¤Æ
¿·¤·¤¤¥í¥Ã¥¯¤¬Å¬ÍѤµ¤ì¤Þ¤¹ (¾¤Î¥×¥í¥»¥¹¤¬¥í¥Ã¥¯¤ò¼èÆÀ¤·
²òÊü¤·¤¿¸å¤«¤â¤·¤ì¤Þ¤»¤ó)¡£
.Pp
´û¤Ë¥í¥Ã¥¯¤µ¤ì¤Æ¤¤¤ë¥ª¥Ö¥¸¥§¥¯¥È¤Ë¤Ä¤¤¤Æ¥í¥Ã¥¯¤òÍ׵᤹¤ë¤È¡¢
¥í¥Ã¥¯¤¬³ÍÆÀ¤Ç¤­¤ë¤Þ¤Ç¸Æ¤Ó½Ð¤·Â¦¤Ï¥Ö¥í¥Ã¥¯¤µ¤ì¤Þ¤¹¡£¤¿¤À¤·
.Dv LOCK_NB
¤¬
.Fa operation
¤Ë´Þ¤Þ¤ì¤ë¾ì¹ç¤Ï¥Ö¥í¥Ã¥¯¤µ¤ì¤Þ¤»¤ó¡£Âå¤ï¤ê¤Ë¸Æ¤Ó½Ð¤·¤¬¼ºÇÔ¤·¡¢
¥¨¥é¡¼
.Er EWOULDBLOCK
¤¬ÊÖ¤µ¤ì¤Þ¤¹¡£
.Sh Ãí
¥í¥Ã¥¯¤Ï¥Õ¥¡¥¤¥ë¤Ë¤«¤±¤é¤ì¤ë¤â¤Î¤Ç¤¢¤Ã¤Æ¡¢
¥Õ¥¡¥¤¥ëµ­½Ò»Ò¤Ë¤«¤±¤é¤ì¤ë¤â¤Î¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó¡£
¤¹¤Ê¤ï¤Á¡¢
.Xr dup 2
¤Þ¤¿¤Ï
.Xr fork 2
¤Ë¤è¤Ã¤ÆÊ£À½¤µ¤ì¤¿¥Õ¥¡¥¤¥ëµ­½Ò»Ò¤Ï¡¢
¥í¥Ã¥¯¤ÎÊ£¿ô¤Î¥¤¥ó¥¹¥¿¥ó¥¹¤È¤Ï¤Ê¤é¤º¤Ë¡¢1 ¤Ä¤Î¥í¥Ã¥¯¤Ø¤ÎÊ£¿ô¤Î
»²¾È¤Ë¤Ê¤ê¤Þ¤¹¡£¤¢¤ë¥Õ¥¡¥¤¥ë¤Ë¤Ä¤¤¤Æ¤Î¥í¥Ã¥¯¤òÊÝ»ý¤·¤Æ¤¤¤ë¥×¥í¥»¥¹¤¬
¥Õ¥©¡¼¥¯¤·¡¢»Ò¥×¥í¥»¥¹¤¬ÌÀ¼¨Åª¤Ë¤½¤Î
¥Õ¥¡¥¤¥ë¤ò¥¢¥ó¥í¥Ã¥¯¤¹¤ë¾ì¹ç¡¢¿Æ¥×¥í¥»¥¹¤Ï¤½¤Î¥í¥Ã¥¯¤ò¼º¤¤¤Þ¤¹¡£
.Pp
¥í¥Ã¥¯¤òÂԤäƥ֥í¥Ã¥¯¤·¤Æ¤¤¤ë¥×¥í¥»¥¹¤Ï¥·¥°¥Ê¥ë¤Çµ¯¤³¤µ¤ì¤ë¤«¤â¤·¤ì¤Þ¤»¤ó¡£
.Sh ¼ÂÁõ¤Ë´Ø¤¹¤ëÃí
.Pp
Èó¥¹¥ì¥Ã¥É¥é¥¤¥Ö¥é¥ê¤Ç¤Ï¡¢
.Fn flock
¤Ï
.Va flock
¥·¥¹¥Æ¥à¥³¡¼¥ë¤È¤·¤Æ¼ÂÁõ¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
.Pp
¥¹¥ì¥Ã¥É¥é¥¤¥Ö¥é¥ê¤Ç¤Ï¡¢
.Va flock
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï
.Fn _thread_sys_flock
¤Ë¥¢¥»¥ó¥Ö¥ë¤µ¤ì¡¢
.Fn flock
¤Ï¡¢Æɤ߽ñ¤­¤Ë¤Ä¤¤¤Æ
.Fa fd
¤ò¥í¥Ã¥¯¤·¤Æ¤«¤é¡¢
.Fn _thread_sys_flock
¤ò¸Æ¤Ó½Ð¤¹´Ø¿ô¤È¤·¤Æ
¼ÂÁõ¤µ¤ì¤Æ¤¤¤Þ¤¹¡£Ìá¤ëÁ°¤Ë
.Fn flock
¤Ï
.Fa fd
¤ò¥¢¥ó¥í¥Ã¥¯¤·¤Þ¤¹¡£
.Sh Ìá¤êÃÍ
Áàºî¤¬Àµ¾ï¤Ë´°Î»¤·¤¿¾ì¹ç¤Ï 0¤¬ÊÖ¤µ¤ì¤Þ¤¹¡£
¥¨¥é¡¼¤Î¾ì¹ç¤Ï -1 ¤¬ÊÖ¤µ¤ì¡¢
¥¨¥é¡¼¥³¡¼¥É¤Ï¥°¥í¡¼¥Ð¥ëÊÑ¿ô
.Va errno
¤Ë»Ä¤µ¤ì¤Þ¤¹¡£
.Sh ¥¨¥é¡¼
.Fn flock
¸Æ¤Ó½Ð¤·¤Ï¼¡¤Î¾ì¹ç¤Ë¼ºÇÔ¤·¤Þ¤¹:
.Bl -tag -width Er
.It Bq Er EWOULDBLOCK
¥Õ¥¡¥¤¥ë¤Ï¤¹¤Ç¤Ë
.Dv LOCK_NB
¥ª¥×¥·¥ç¥ó¤¬»ØÄꤵ¤ì¤¿¾õÂ֤ǥí¥Ã¥¯¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
.It Bq Er EBADF
°ú¿ô
.Fa fd
¤¬Ìµ¸ú¤Êµ­½Ò»Ò¤ò»Ø¤·¤Æ¤¤¤Þ¤¹¡£
.It Bq Er EINVAL
°ú¿ô
.Fa fd
¤¬¥Õ¥¡¥¤¥ë°Ê³°¤Î¥ª¥Ö¥¸¥§¥¯¥È¤ò»²¾È¤·¤Æ¤¤¤Þ¤¹¡£
.It Bq Er EOPNOTSUPP
°ú¿ô
.Fa fd
¤¬¥Õ¥¡¥¤¥ë¤Î¥í¥Ã¥¯¤ò¥µ¥Ý¡¼¥È¤·¤Ê¤¤¥ª¥Ö¥¸¥§¥¯¥È¤ò»²¾È¤·¤Æ¤¤¤Þ¤¹¡£
.El
.Sh ´ØÏ¢¹àÌÜ
.Xr close 2 ,
.Xr dup 2 ,
.Xr execve 2 ,
.Xr fork 2 ,
.Xr open 2
.Sh Îò»Ë
.Fn flock
´Ø¿ô¤Ï
.Bx 4.2
¤ÇÅо줷¤Þ¤·¤¿¡£