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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, sym-
links, 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 names-
pace 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 operation. XATTR_CREATE
specifies a pure create, which fails if the named attribute exists already. XATTR_REPLACE
specifies a pure replace operation, 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 enforcement was the cause.
If extended attributes are not supported by the filesystem, or are disabled, errno is set
to ENOTSUP.
The errors documented for the stat(2) system call are also applicable here.
AUTHORS
Andreas Gruenbacher, <a.gruenbacher AT bestbits.at> and the SGI XFS development team, <linux-
xfs AT oss.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)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/2.4.6 (CentOS)
Under GNU General Public License
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