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-.\"
-.\" Extended attributes system calls manual pages
-.\"
-.\" (C) Andreas Gruenbacher, February 2001
-.\" (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.
-.\"
-.TH LISTXATTR 2 "Extended Attributes" "Dec 2001" "Linux Programmer's Manual"
-.SH NAME
-listxattr, llistxattr, flistxattr \- list extended attribute names
-.SH SYNOPSIS
-.fam C
-.nf
-.B #include <sys/types.h>
-.B #include <attr/xattr.h>
-.sp
-.BI "ssize_t listxattr (const char\ *" path ",
-.BI "\t\t\t\t char\ *" list ", size_t " size );
-.BI "ssize_t llistxattr (const char\ *" path ",
-.BI "\t\t\t\t char\ *" list ", size_t " size );
-.BI "ssize_t flistxattr (int " filedes ",
-.BI "\t\t\t\t char\ *" list ", size_t " size );
-.fi
-.fam T
-.SH DESCRIPTION
-Extended attributes are name:value
-pairs associated with inodes (files, directories, symlinks, etc).
-They are extensions to the normal attributes which are associated
-with all inodes in the system (i.e. the
-.BR stat (2)
-data).
-A complete overview of extended attributes concepts can be found in
-.BR attr (5).
-.PP
-.B listxattr
-retrieves the
-.I list
-of extended attribute names associated with the given
-.I path
-in the filesystem.
-The list is the set of (NULL-terminated) names, one after the other.
-Names of extended attributes to which the calling process does not
-have access may be omitted from the list.
-The length of the attribute name
-.I list
-is returned.
-.PP
-.B llistxattr
-is identical to 
-.BR listxattr ,
-except in the case of a symbolic link, where the list of names of
-extended attributes associated with the link itself is retrieved,
-not the file that it refers to.
-.PP
-.B flistxattr
-is identical to
-.BR listxattr ,
-only the open file pointed to by
-.I filedes
-(as returned by
-.BR open (2))
-is interrogated in place of
-.IR path .
-.PP
-A single extended attribute
-.I name
-is a simple NULL-terminated string.
-The name includes a namespace prefix \- there may be several, disjoint
-namespaces associated with an individual inode.
-.PP
-An empty buffer of
-.I size
-zero can be passed into these calls to return the current size of the
-list of extended attribute names, which can be used to estimate the
-size of a buffer which is sufficiently large to hold the list of names.
-.SH EXAMPLES
-The
-.I list
-of names is returned as an unordered array of NULL-terminated character
-strings (attribute names are separated by NULL characters), like this:
-.fam C
-.RS
-.nf
-user.name1\\0system.name1\\0user.name2\\0
-.fi
-.RE
-.fam T
-.P
-Filesystems like ext2, ext3 and XFS which implement POSIX ACLs using
-extended attributes, might return a
-.I list
-like this:
-.fam C
-.RS
-.nf
-system.posix_acl_access\\0system.posix_acl_default\\0
-.fi
-.RE
-.fam T
-.SH RETURN VALUE
-On success, a positive number is returned indicating the size of the
-extended attribute name list.
-On failure, \-1 is returned and
-.I errno
-is set appropriately.
-.PP
-If the
-.I size
-of the
-.I list
-buffer is too small to hold the result,
-.I errno
-is set to ERANGE.
-.PP
-If extended attributes are not supported by the filesystem, or are disabled,
-.I errno
-is set to ENOTSUP.
-.PP
-The errors documented for the
-.BR stat (2)
-system call are also applicable here.
-.SH AUTHORS
-Andreas Gruenbacher,
-.RI < a.gruenbacher@computer.org >
-and the SGI XFS development team,
-.RI < linux-xfs@oss.sgi.com >.
-Please send any bug reports or comments to these addresses.
-.SH SEE ALSO
-.BR getfattr (1),
-.BR setfattr (1),
-.BR getxattr (2),
-.BR open (2),
-.BR removexattr (2),
-.BR setxattr (2),
-.BR stat (2),
-.BR attr (5)