543 lines
14 KiB
Groff
543 lines
14 KiB
Groff
.\" Copyright (c) 1983, 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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.\" @(#)fcntl.2 8.2 (Berkeley) 1/12/94
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.\" %FreeBSD: src/lib/libc/sys/fcntl.2,v 1.16.2.12 2002/04/29 08:21:58 asmodai Exp %
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.\"
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.\" $FreeBSD$
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.Dd January 12, 1994
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.Dt FCNTL 2
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.Os
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.Sh ̾¾Î
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.Nm fcntl
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.Nd ¥Õ¥¡¥¤¥ëÀ©¸æ
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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 fcntl.h
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.Ft int
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.Fn fcntl "int fd" "int cmd" "..."
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.Sh ²òÀâ
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.Fn fcntl
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¤Ï¡¢µ½Ò»Ò¤ÎÀ©¸æµ¡Ç½¤òÄ󶡤·¤Þ¤¹¡£°ú¿ô
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.Fa fd
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¤Ï¡¢¸å½Ò¤¹¤ë
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.Fa cmd
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¤Ë¤è¤Ã¤ÆÁàºî¤µ¤ì¤ëµ½Ò»Ò¤Ç¤¹¡£
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.Fa cmd
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¤ÎÃͤˤè¤Ã¤Æ¤Ï¡¢
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.Nm
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¤Ï 3 ¤Ä¤á¤Î°ú¿ô
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.Fa "int arg"
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¤ò¼è¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹¡£
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.Bl -tag -width F_GETOWNX
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.It Dv F_DUPFD
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.Pp
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.Bl -bullet -compact -offset 4n
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.It
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.Fa arg
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.It
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.It
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.It
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Ʊ¤¸¥¢¥¯¥»¥¹¥â¡¼¥É (Æɼè¤ê¡¢½ñ¹þ¤ß¡¢¤Þ¤¿¤ÏÆɼè¤ê¤È½ñ¹þ¤ß)
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ξÊý¤Î¥Õ¥¡¥¤¥ëµ½Ò»Ò¤¬Æ±¤¸¥Õ¥¡¥¤¥ë¥¹¥Æ¡¼¥¿¥¹
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.It
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close-on-exec ¥Õ¥é¥°¤Ï¡¢
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.Xr execve 2
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Î¸å¤Ç¤â
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µ½Ò»Ò¤ò¥ª¡¼¥×¥ó¤·¤¿¤Þ¤Þ¤Ç¤¤¤ë¤è¤¦¤ËÀßÄê
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.El
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.It Dv F_GETFD
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.Fa fd
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¤Ë·ë¤ÓÉÕ¤±¤é¤ì¤¿ close-on-exec ¥Õ¥é¥°¤ò¡¢
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.Dv FD_CLOEXEC
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ÊÖ¤µ¤ì¤¿ÃͤÈ
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.Dv FD_CLOEXEC
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¤ÎÏÀÍýÀѤ¬ 0 ¤Î¾ì¹ç¡¢¥Õ¥¡¥¤¥ë¤Ï
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.Fn exec
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¤ò¼Â¹Ô¤·¤Æ¤â¥ª¡¼¥×¥ó¤µ¤ì¤¿¤Þ¤Þ¤Ë¤Ê¤ê¤Þ¤¹¡£
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.Fa ( arg
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.It Dv F_SETFD
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.Fa fd
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¤Ë·ë¤ÓÉÕ¤±¤é¤ì¤¿ close-on-exec ¥Õ¥é¥°¤ò
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.Fa arg
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¤Ï 0 ¤Þ¤¿¤ÏÁ°½Ò¤Î
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.Dv FD_CLOEXEC
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.It Dv F_GETFL
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.It Dv F_SETFL
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µ½Ò»Ò¥¹¥Æ¡¼¥¿¥¹¥Õ¥é¥°¤ò
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.It Dv F_GETOWN
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.Dv SIGIO
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¥·¥°¥Ê¥ë¤È
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.Dv SIGURG
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.El
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.Pp
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.Dv F_GETFL
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¤ª¤è¤Ó
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ÍѤΥե饰¤Ï¼¡¤Î¤È¤ª¤ê¤Ç¤¹¡£
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.Bl -tag -width O_NONBLOCKX
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.It Dv O_NONBLOCK
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.Xr read 2
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¸Æ¤Ó½Ð¤·¤ÇÆɤ߼è¤ë¤Ù¤¥Ç¡¼¥¿¤¬Ìµ¤¤¾ì¹ç¡¢¤Þ¤¿¤Ï
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.Xr write 2
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Áàºî¤¬¥Ö¥í¥Ã¥¯¤¹¤ë¤Ç¤¢¤í¤¦¾ì¹ç¤Ë¡¢Æɼè¤ê¸Æ¤Ó½Ð¤·¤Þ¤¿¤Ï½ñ¹þ¤ß¸Æ¤Ó½Ð¤·¤Ï¥¨¥é¡¼
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.Er EAGAIN
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¤Ç -1 ¤òÊÖ¤·¤Þ¤¹¡£
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.Xr open 2
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¥·¥°¥Ê¥ë¤¬¥×¥í¥»¥¹¥°¥ë¡¼¥×¤ËÁ÷¿®¤µ¤ì¤ë¤è¤¦¤Ë¤·¤Þ¤¹¡£
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.El
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Ìä¹ç¤»·¿¥Õ¥¡¥¤¥ë¥í¥Ã¥¯¤ò¹Ô¤Ê¤¦¤¿¤á¤Ë¤¤¤¯¤Ä¤«¤Î¥³¥Þ¥ó¥É¤¬ÍøÍѤǤ¤Þ¤¹¡£
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¤³¤ì¤é¤Î¥³¥Þ¥ó¥É¤Ï¤¹¤Ù¤Æ¼¡¤Î¹½Â¤ÂΤÇÁàºî¤·¤Þ¤¹¡£
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.ne 7v
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.Bd -literal
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struct flock {
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off_t l_start; /* ³«»Ï°ÌÃ֤Υª¥Õ¥»¥Ã¥È */
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off_t l_len; /* len = 0 ¤Ï¥Õ¥¡¥¤¥ëËöÈø¤Þ¤Ç¤È¤¤¤¦°ÕÌ£ */
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pid_t l_pid; /* ¥í¥Ã¥¯½êÍ¼Ô */
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short l_type; /* ¥í¥Ã¥¯¥¿¥¤¥×: Æɼè¤ê/½ñ¹þ¤ß¤Ê¤É */
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short l_whence; /* l_start ¤Î¥¿¥¤¥× */
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};
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.Ed
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Ìä¹ç¤»·¿¥ì¥³¡¼¥É¥í¥Ã¥¯¤ËÍøÍѤǤ¤ë¥³¥Þ¥ó¥É¤Ï¼¡¤Î¤È¤ª¤ê¤Ç¤¹¡£
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.Bl -tag -width F_SETLKWX
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.It Dv F_GETLK
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3 ÈÖ¤á¤Î°ú¿ô
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.Fa arg
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¤ò
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.Fa "struct flock"
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(Á°µ¤ò»²¾È) ¤Ø¤Î¥Ý¥¤¥ó¥¿¤È²ò¼á¤·¤Æ¡¢¤½¤ì¤Ë¤è¤Ã¤Æ»ØÄꤵ¤ì¤ë
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.Fn fcntl
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¤ËÅϤµ¤ì¤¿
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.Fa flock
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¤¿¤À¤·¡¢¥í¥Ã¥¯¥¿¥¤¥×¤¬
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.Dv F_UNLCK
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.It Dv F_SETLK
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3 ÈÖ¤á¤Î°ú¿ô
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.Fa arg
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¤ò
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.Fa "struct flock"
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(Á°µ¤ò»²¾È) ¤Ø¤Î¥Ý¥¤¥ó¥¿¤È²ò¼á¤·¤Æ¡¢¤½¤ì¤Ë¤è¤Ã¤Æ»ØÄꤵ¤ì¤ë
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¤Ï¡¢¶¦Í (¤Þ¤¿¤ÏÆɼè¤ê) ¥í¥Ã¥¯
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.Pq Dv F_RDLCK
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¤Þ¤¿¤ÏÇÓ¾Ū (¤Þ¤¿¤Ï½ñ¹þ¤ß) ¥í¥Ã¥¯
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.Pq Dv F_WRLCK
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¶¦Í¥í¥Ã¥¯¤Þ¤¿¤ÏÇÓ¾Ū¥í¥Ã¥¯¤¬ÀßÄê¤Ç¤¤Ê¤¤¾ì¹ç¡¢
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.Fn fcntl
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¤Ï
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.Er EAGAIN
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¤Ç¤¿¤À¤Á¤ËÌá¤ê¤Þ¤¹¡£
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.It Dv F_SETLKW
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¤³¤Î¥³¥Þ¥ó¥É¤Ï
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.Fn fcntl
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.Dv SA_RESTART
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.Pf ( Xr sigaction 2
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¤ò»²¾È) ¤ò
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.El
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.Pp
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.Fa l_whence
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¤ÎÃͤÏ
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.Dv SEEK_SET ,
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.Dv SEEK_CUR ,
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¤Þ¤¿¤Ï
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.Dv SEEK_END
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¤Ç¡¢¤³¤ì¤é¤ÏÁêÂÐ¥ª¥Õ¥»¥Ã¥È
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.Fa l_start
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.Fa l_len
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.Fa l_len
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.Fa l_pid
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¥Õ¥£¡¼¥ë¥É¤Ï¡¢
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.Dv F_GETLK
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¤Ç¤Î¤ß»ÈÍѤµ¤ì¤Þ¤¹¡£
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.Dv F_GETLK
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Í׵᤬Àµ¾ï¤Ë´°Î»¤¹¤ë¤È
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.Fa l_whence
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¤ÎÃͤÏ
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.Dv SEEK_SET
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.Pp
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¥í¥Ã¥¯¤Ï¸½ºß¤Î¥Õ¥¡¥¤¥ëËöÈø°Ê¹ß¤Ç³«»Ï¤·¤¿¤ê¡¢
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.Fa l_len
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¤¬ 0 ¤ËÀßÄꤵ¤ì¤Æ¤¤¤ë¾ì¹ç¡¢¥í¥Ã¥¯¤Ï¤½¤Î¥Õ¥¡¥¤¥ë¤Î
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