157 lines
4.2 KiB
Groff
157 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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.\" @(#)dup.2 8.1 (Berkeley) 6/4/93
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.\" %FreeBSD: src/lib/libc/sys/dup.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 June 4, 1993
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.Dt DUP 2
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.Os
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.Sh ̾¾Î
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.Nm dup ,
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.Nm dup2
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.Nd ´û¸¤Î¥Õ¥¡¥¤¥ëµ½Ò»Ò¤òÊ£À½¤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 int
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.Fn dup "int oldd"
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.Ft int
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.Fn dup2 "int oldd" "int newd"
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.Sh ²òÀâ
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.Fn dup
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢´û¸¤Î¥ª¥Ö¥¸¥§¥¯¥Èµ½Ò»Ò¤òÊ£À½¤·¡¢
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¤½¤ÎÃͤò¸Æ¤Ó½Ð¤·¥×¥í¥»¥¹¤ËÊÖ¤·¤Þ¤¹
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.Fa ( newd
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=
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.Fn dup oldd )
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¡£
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°ú¿ô
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.Fa oldd
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¤Ï¥×¥í¥»¥¹¤Îµ½Ò»Ò¥Æ¡¼¥Ö¥ëÆâ¤Î¥¤¥ó¥Ç¥Ã¥¯¥¹¤Ç¡¢Éé¤Ç¤Ê¤¤¾®¤µ¤ÊÀ°¿ô¤Ç¤¹¡£
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¤½¤ÎÃͤϥơ¼¥Ö¥ë¤Î¥µ¥¤¥º¤è¤ê¾®¤µ¤¯¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£
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¥Æ¡¼¥Ö¥ë¤Î¥µ¥¤¥º¤Ï
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.Xr getdtablesize 2
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¤Ë¤è¤Ã¤ÆÊÖ¤µ¤ì¤Þ¤¹¡£
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.Fn dup
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¸Æ¤Ó½Ð¤·¤Ï¡¢¤½¤Î¤È¤¤Ë¥×¥í¥»¥¹¤Ë¤è¤Ã¤Æ»ÈÍѤµ¤ì¤Æ¤¤¤Ê¤¤ÈÖ¹æ¤Î¤¦¤Á¡¢
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ºÇ¤â¾®¤µ¤¤ÈÖ¹æ¤ÎÉÕ¤¤¤¿µ½Ò»Ò¤òÊÖ¤·¤Þ¤¹¡£
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.Pp
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µ½Ò»Ò¤¬»²¾È¤¹¤ë¥ª¥Ö¥¸¥§¥¯¥È¤Ï
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.Fa oldd
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¤È
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.Fa newd
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¤ò¤Þ¤Ã¤¿¤¯¶èÊ̤·¤Þ¤»¤ó¡£
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¤·¤¿¤¬¤Ã¤Æ
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.Fa newd
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¤È
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.Fa oldd
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¤¬¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ø¤ÎÊ£À½¤µ¤ì¤¿»²¾È¤À¤Ã¤¿¾ì¹ç¡¢¤¹¤Ù¤Æ¤Î
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.Xr read 2 ,
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.Xr write 2
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¤ª¤è¤Ó
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.Xr lseek 2
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¸Æ¤Ó½Ð¤·¤Ï¡¢Ã±°ì¤Î¥Ý¥¤¥ó¥¿¤ò¥Õ¥¡¥¤¥ëÆâ¤Ç°ÜÆ°¤·¤Þ¤¹¡£
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Äɲå⡼¥É¡¢¥Î¥ó¥Ö¥í¥Ã¥¥ó¥°Æþ½ÐÎÏ
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¤ª¤è¤ÓÈóƱ´üÆþ½ÐÎÏ¥ª¥×¥·¥ç¥ó¤Ï³Æ»²¾È¤Î´Ö¤Ç¶¦Í¤µ¤ì¤Þ¤¹¡£
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°ì¤Ä¤Î¥Õ¥¡¥¤¥ë¤Ø¤ÎÊÌ¡¹¤Î¥Ý¥¤¥ó¥¿¤¬É¬Íפʾì¹ç¤Ï¡¢ÄɲäÎ
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.Xr open 2
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤ò¸Æ¤Ó½Ð¤·¡¢¥Õ¥¡¥¤¥ë¤Ø¤Î°Û¤Ê¤ë¥ª¥Ö¥¸¥§¥¯¥È»²¾È¤ò
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ÆÀ¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£
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¤³¤Î¤È¤¡¢¿·¤·¤¤¥Õ¥¡¥¤¥ëµ½Ò»Ò¤Î close-on-exec ¥Õ¥é¥°¤ÏÀßÄê²ò½ü¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
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.Pp
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.Fn dup2
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¤Ë¤Ï¿·¤·¤¤µ½Ò»Ò
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.Fa newd
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¤ÎÃͤò»ØÄꤷ¤Þ¤¹¡£
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¤³¤Îµ½Ò»Ò¤¬´û¤Ë»ÈÍѤµ¤ì¤Æ¤¤¤¿¾ì¹ç¡¢
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.Fa oldd
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\*(Ne
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.Fa newd
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¤Ç¤¢¤ì¤Ð¡¢¤Þ¤º¤½¤Îµ½Ò»Ò¤Ï
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.Xr close 2
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬»ÈÍѤµ¤ì¤¿¤«¤Î¤è¤¦¤Ë³ä¤êÅö¤Æ²ò½ü¤µ¤ì¤Þ¤¹¡£
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.Fa oldd
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¤¬Í¸ú¤Êµ½Ò»Ò¤Ç¤Ê¤«¤Ã¤¿¾ì¹ç¤Ë¤Ï¡¢
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.Fa newd
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¤Ï¥¯¥í¡¼¥º¤µ¤ì¤Þ¤»¤ó¡£
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.Fa oldd
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==
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.Fa newd
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¤Ç¤¢¤ê¡¢¤·¤«¤â
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.Fa oldd
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¤¬Í¸ú¤Êµ½Ò»Ò¤Î¾ì¹ç¡¢
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.Fn dup2
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¤ÏÀµ¾ï¤Ë½ªÎ»¤·¡¢²¿¤â¤·¤Þ¤»¤ó¡£
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.Sh Ìá¤êÃÍ
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¤¤¤º¤ì¤«¤Î¸Æ¤Ó½Ð¤·¤Ç¥¨¥é¡¼¤¬µ¯¤¤¿¾ì¹ç¤ÏÃÍ -1 ¤¬ÊÖ¤µ¤ì¤Þ¤¹¡£
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³°ÉôÊÑ¿ô
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.Va errno
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¤Ï¥¨¥é¡¼¤Î¸¶°ø¤ò¼¨¤·¤Þ¤¹¡£
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.Sh ¥¨¥é¡¼
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.Fn dup
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤È
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.Fn dup2
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢¼¡¤Î¾ì¹ç¤Ë½èÍý¤Ë¼ºÇÔ¤·¤Þ¤¹:
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.Bl -tag -width Er
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.It Bq Er EBADF
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.Fa oldd
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¤Þ¤¿¤Ï
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.Fa newd
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°ú¿ô¤¬Í¸ú¤Ê¥¢¥¯¥Æ¥£¥Öµ½Ò»Ò¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó¡£
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.It Bq Er EMFILE
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¥¢¥¯¥Æ¥£¥Ö¤Êµ½Ò»Ò¤¬Â¿¤¹¤®¤Þ¤¹¡£
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.El
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.Sh ´ØÏ¢¹àÌÜ
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.Xr accept 2 ,
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.Xr close 2 ,
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.Xr fcntl 2 ,
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.Xr getdtablesize 2 ,
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.Xr open 2 ,
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.Xr pipe 2 ,
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.Xr socket 2 ,
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.Xr socketpair 2
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.Sh µ¬³Ê
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.Fn dup
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤È
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.Fn dup2
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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 dup
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´Ø¿ô¤È
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.Fn dup2
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´Ø¿ô¤Ï
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.At v7
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¤ÇÅо줷¤Þ¤·¤¿¡£
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