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SETXATTR(2)			 System calls			   SETXATTR(2)

NAME
       setxattr, lsetxattr, fsetxattr - set an extended attribute value

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

       int setxattr (const char *path, const char *name,
		       const void *value, size_t size, int flags);
       int lsetxattr (const char *path, const char *name,
		       const void *value, size_t size, int flags);
       int fsetxattr (int filedes, const char *name,
		       const void *value, size_t size, int flags);

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).

       setxattr	 sets  the  value of the extended attribute identified by name
       and associated with the given path in the filesystem.  The size of  the
       value must be specified.

       lsetxattr  is  identical	 to setxattr, except in the case of a symbolic
       link, where the extended attribute is set on the link itself,  not  the
       file that it refers to.

       fsetxattr  is identical to setxattr, only the extended attribute is set
       on the open file pointed to by filedes  (as  returned  by  open(2))  in
       place of path.

       An  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.   The  value of an
       extended attribute is a chunk of arbitrary textual or  binary  data  of
       specified length.

       The  flags  parameter can be used to refine the semantics of the opera‐
       tion.  XATTR_CREATE specifies a pure create, which fails if  the	 named
       attribute exists already.  XATTR_REPLACE specifies a pure replace oper‐
       ation, which fails if the named attribute does not already  exist.   By
       default	(no flags), the extended attribute will be created if need be,
       or will simply replace the value if the attribute exists.

RETURN VALUE
       On success, zero is returned.  On failure, -1 is returned and errno  is
       set appropriately.

       If  XATTR_CREATE	 is specified, and the attribute exists already, errno
       is set to EEXIST.  If XATTR_REPLACE is  specified,  and	the  attribute
       does not exist, errno is set to ENOATTR.

       If  there  is  insufficient  space  remaining  to  store	 the  extended
       attribute, errno is set to either ENOSPC, or EDQUOT if  quota  enforce‐
       ment was the cause.

       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), listxattr(2),
       removexattr(2), and attr(5).

Dec 2001		      Extended Attributes		   SETXATTR(2)
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