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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man2 / removexattr.2

.\"
.\" Extended attributes system calls manual pages
.\"
.\" Copyright (C) Andreas Gruenbacher, February 2001
.\" Copyright (C) Silicon Graphics Inc, September 2001
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
.\" USA.
.\"
.\" Japanese Version Copyright (c) 2003  Akihiro MOTOKI
.\"         all rights reserved.
.\" Translated Tue Jul  8 04:43:40 JST 2003
.\"         by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.\"WORD:        extended attributes     ³Èĥ°À­
.\"WORD:        namespace               ̾Á°¶õ´Ö
.\"
.TH REMOVEXATTR 2 2001-12-01 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.\"O removexattr, lremovexattr, fremovexattr \- remove an extended attribute
.SH ̾Á°
removexattr, lremovexattr, fremovexattr \- ³Èĥ°À­¤òºï½ü¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.fam C
.nf
.B #include <sys/types.h>
.B #include <attr/xattr.h>
.sp
.BI "int removexattr(const char\ *" path ", const char\ *" name );
.BI "int lremovexattr(const char\ *" path ", const char\ *" name );
.BI "int fremovexattr(int " fd ", const char\ *" name );
.fi
.fam T
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O Extended attributes are
.\"O .IR name :\c
.\"O value pairs associated with inodes (files, directories, symbolic links, etc.).
.\"O They are extensions to the normal attributes which are associated
.\"O with all inodes in the system (i.e., the
.\"O .BR stat (2)
.\"O data).
.\"O A complete overview of extended attributes concepts can be found in
.\"O .BR attr (5).
³Èĥ°À­¤Ï¡¢inode (¥Õ¥¡¥¤¥ë¡¢¥Ç¥£¥ì¥¯¥È¥ê¡¢¥·¥ó¥Ü¥ê¥Ã¥¯¥ê¥ó¥¯Åù) ¤Ë
´ØÏ¢ÉÕ¤±¤é¤ì¤¿
.IR name :\c
.I value
¤ÎÂФǤ¢¤ë¡£
¤³¤ì¤é¤Ï¡¢¥·¥¹¥Æ¥à¾å¤Î¤¹¤Ù¤Æ¤Î inode ¤Ë´ØÏ¢ÉÕ¤±¤é¤ì¤¿Ä̾ï¤Î°À­
.RB ( stat (2)
¤¬ÊÖ¤¹¥Ç¡¼¥¿) ¤ò³ÈÄ¥¤¹¤ë¤â¤Î¤Ç¤¢¤ë¡£
³Èĥ°À­¤Î¥³¥ó¥»¥×¥È¤Ï
.BR attr (5)
¤Ë½ñ¤«¤ì¤Æ¤¤¤ë¡£
.PP
.\"O .BR removexattr ()
.\"O removes the extended attribute identified by
.\"O .I name
.\"O and associated with the given
.\"O .I path
.\"O in the file system.
.BR removexattr ()
¤Ï¡¢¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥àÆâ¤Î»ØÄꤵ¤ì¤¿
.I path
¤ËÂбþ¤¹¤ë¡¢Ì¾Á°
.I name
¤Î³Èĥ°À­¤òºï½ü¤¹¤ë¡£
.PP
.\"O .BR lremovexattr ()
.\"O is identical to
.\"O .BR removexattr (),
.\"O except in the case of a symbolic link, where the extended attribute is
.\"O removed from the link itself, not the file that it refers to.
.BR lremovexattr ()
¤Ï
.BR removexattr ()
¤ÈƱ¤¸¤À¤¬¡¢¥·¥ó¥Ü¥ê¥Ã¥¯¥ê¥ó¥¯¤Î¾ì¹ç¤Ë¡¢¥ê¥ó¥¯¤¬»²¾È¤·¤Æ¤¤¤ë¥Õ¥¡¥¤¥ë
¤Ç¤Ï¤Ê¤¯¡¢¥ê¥ó¥¯¤½¤Î¤â¤Î¤Î¾ðÊó¤òºï½ü¤¹¤ëÅÀ¤À¤±¤¬°Û¤Ê¤ë¡£
.PP
.\"O .BR fremovexattr ()
.\"O is identical to
.\"O .BR removexattr (),
.\"O only the extended attribute is removed from the open file referred to by
.\"O .I fd
.\"O (as returned by
.\"O .BR open (2))
.\"O in place of
.\"O .IR path .
.BR fremovexattr ()
¤Ï
.BR removexattr ()
¤ÈƱ¤¸¤À¤¬¡¢
.I path
¤ÎÂå¤ï¤ê¤Ë
.I fd
¤Ç»²¾È¤µ¤ì¤¿¥ª¡¼¥×¥óºÑ¤ß¥Õ¥¡¥¤¥ë¤«¤é³Èĥ°À­¤òºï½ü¤¹¤ë¤À¤±¤Ç¤¢¤ëÅÀ¤¬°Û¤Ê¤ë
.RI ( fd
¤Ï
.BR open (2)
¤Ë¤è¤Ã¤ÆÊÖ¤µ¤ì¤ë)¡£
.PP
.\"O An extended attribute name is a simple null-terminated string.
.\"O The
.\"O .I name
.\"O includes a namespace prefix; there may be several, disjoint
.\"O namespaces associated with an individual inode.
³Èĥ°À­¤Î̾Á°¤Ï¡¢ÉáÄ̤ΠNULL ½ªÃ¼¤µ¤ì¤¿Ê¸»úÎó¤Ç¤¢¤ë¡£
.I name
¤Ë¤Ï¡¢Ì¾Á°¶õ´Ö¤òɽ¤¹ÀÜƬ¼­ (prefix) ¤¬´Þ¤Þ¤ì¤ë¡£
¸Ä¡¹¤Î inode ¤ËÂФ·¡¢¸ß¤¤¤ËÆÈΩ¤Ê̾Á°¶õ´Ö¤¬Ê£¿ô¤¢¤Ã¤Æ¤â¤è¤¤¡£
.\"O .SH RETURN VALUE
.SH ÊÖ¤êÃÍ
.\"O On success, zero is returned.
.\"O On failure, \-1 is returned and
.\"O .I errno
.\"O is set appropriately.
À®¸ù¤·¤¿¾ì¹ç¡¢0 ¤¬ÊÖ¤µ¤ì¤ë¡£
¼ºÇÔ¤·¤¿¾ì¹ç¡¢ \-1 ¤¬ÊÖ¤µ¤ì¡¢
.I errno
¤ËŬÀÚ¤ÊÃͤ¬¥»¥Ã¥È¤µ¤ì¤ë¡£
.PP
.\"O If the named attribute does not exist,
.\"O .I errno
.\"O is set to
.\"O .BR ENOATTR .
»ØÄꤵ¤ì¤¿Ì¾Á°¤Î°À­¤¬Â¸ºß¤·¤Ê¤¤¾ì¹ç¡¢
.I errno
¤Ë
.B ENOATTR
¤¬¥»¥Ã¥È¤µ¤ì¤ë¡£
.PP
.\"O If extended attributes are not supported by the file system, or are disabled,
.\"O .I errno
.\"O is set to
.\"O .BR ENOTSUP .
³Èĥ°À­¤¬¤½¤Î¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ç¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç¡¢
¤â¤·¤¯¤Ï̵¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤ë¾ì¹ç¡¢
.I errno
¤Ë
.B ENOTSUP
¤¬¥»¥Ã¥È¤µ¤ì¤ë¡£
.PP
.\"O The errors documented for the
.\"O .BR stat (2)
.\"O system call are also applicable here.
.BR stat (2)
¥·¥¹¥Æ¥à¥³¡¼¥ë¤ÎÀâÌÀ¤Ë½ñ¤«¤ì¤Æ¤¤¤ë¥¨¥é¡¼¤Ï
¤³¤ì¤é¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ë¤âŬÍѤµ¤ì¤ë¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O These system calls have been available on Linux since kernel 2.4;
.\"O glibc support is provided since version 2.3.
¤³¤ì¤é¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¥«¡¼¥Í¥ë 2.4 °Ê¹ß¤Î Linux ¤ÇÍøÍѤǤ­¤ë¡£
glibc ¤Ç¤Î¥µ¥Ý¡¼¥È¤Ï¥Ð¡¼¥¸¥ç¥ó 2.3 °Ê¹ß¤Ç¹Ô¤ï¤ì¤Æ¤¤¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O These system calls are Linux-specific.
¤³¤ì¤é¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï Linux Æȼ«¤Ç¤¢¤ë¡£
.\"O .\" .SH AUTHORS
.\" .SH Ãø¼Ô
.\"O .\" Andreas Gruenbacher,
.\"O .\" .RI < a.gruenbacher@computer.org >
.\"O .\" and the SGI XFS development team,
.\"O .\" .RI < linux-xfs@oss.sgi.com >.
.\"O .\" Please send any bug reports or comments to these addresses.
.\" Andreas Gruenbacher,
.\" .RI < a.gruenbacher@computer.org >
.\" ¤È SGI XFS ³«È¯¥Á¡¼¥à,
.\" .RI < linux-xfs@oss.sgi.com >¡£
.\" ¥Ð¥°¥ì¥Ý¡¼¥È¤ä¥³¥á¥ó¥È¤Ï¾åµ­¤Î¥¢¥É¥ì¥¹¤Þ¤ÇÁ÷¤Ã¤Æ²¼¤µ¤¤¡£
.\"O .SH SEE ALSO
.SH ´ØÏ¢¹àÌÜ
.BR getfattr (1),
.BR setfattr (1),
.BR getxattr (2),
.BR listxattr (2),
.BR open (2),
.BR setxattr (2),
.BR stat (2),
.BR attr (5),
.BR symlink (7)