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SETXATTR
Section: Linux Programmer's Manual (2)
Updated: 2001-12-31
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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 fd, const char *name,
const void *value, size_t size, int flags);
DESCRIPTION
Extended attributes are
name:value
pairs associated with inodes (files, directories, symbolic 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 file system.
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 referred to by
fd
(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
argument 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 file system, or are disabled,
errno
is set to
ENOTSUP.
The errors documented for the
stat(2)
system call are also applicable here.
VERSIONS
These system calls have been available on Linux since kernel 2.4;
glibc support is provided since version 2.3.
CONFORMING TO
These system calls are Linux-specific.
SEE ALSO
getfattr(1),
setfattr(1),
getxattr(2),
listxattr(2),
open(2),
removexattr(2),
stat(2),
attr(5),
symlink(7)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- VERSIONS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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