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LISTXATTR(2)			 System calls			  LISTXATTR(2)

NAME
       listxattr, llistxattr, flistxattr - list extended attribute names

SYNOPSIS
       #include <sys/types.h>
       #include <attr/xattr.h>

       ssize_t listxattr (const char *path,
			    char *list, size_t size);
       ssize_t llistxattr (const char *path,
			    char *list, size_t size);
       ssize_t flistxattr (int filedes,
			    char *list, size_t size);

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
       stat(2) data).  A complete overview of extended attributes concepts can
       be found in attr(5).

       listxattr  retrieves  the  list	of extended attribute names associated
       with the given 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 list is returned.

       llistxattr  is identical to 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.

       flistxattr  is identical to listxattr, only the open file pointed to by
       filedes (as returned by open(2)) is interrogated in place of path.

       A single extended attribute name is a  simple  NULL-terminated  string.
       The  name  includes a namespace prefix - there may be several, disjoint
       namespaces associated with an individual inode.

       An empty buffer of 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.

EXAMPLES
       The  list of names is returned as an unordered array of NULL-terminated
       character strings (attribute names are separated by  NULL  characters),
       like this:
	      user.name1\0system.name1\0user.name2\0

       Filesystems  like  ext2,	 ext3 and XFS which implement POSIX ACLs using
       extended attributes, might return a list like this:
	      system.posix_acl_access\0system.posix_acl_default\0

RETURN VALUE
       On success, a positive number is returned indicating the	 size  of  the
       extended	 attribute name list.  On failure, -1 is returned and errno is
       set appropriately.

       If the size of the list buffer is too small to hold the	result,	 errno
       is set to ERANGE.

       If extended attributes are not supported by the filesystem, or are dis‐
       abled, errno is set to ENOTSUP.

       The errors documented for the stat(2) system call are  also  applicable
       here.

AUTHORS
       Andreas Gruenbacher, <a.gruenbacher@bestbits.at> and the SGI XFS devel‐
       opment team, <linux-xfs@oss.sgi.com>.  Please send any bug  reports  or
       comments to these addresses.

SEE ALSO
       getfattr(1),  setfattr(1),  open(2), stat(2), getxattr(2), setxattr(2),
       removexattr(2), and attr(5).

Dec 2001		      Extended Attributes		  LISTXATTR(2)
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