установить расширенное значение атрибута (set an extended attribute value)
Имя (Name)
setxattr, lsetxattr, fsetxattr - set an extended attribute value
Синопсис (Synopsis)
#include <sys/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);
Описание (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 xattr(7).
setxattr() sets the value of the extended attribute identified by
name and associated with the given path in the filesystem. The
size argument specifies the size (in bytes) of value; a zero-
length value is permitted.
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 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.
By default (i.e., flags is zero), the extended attribute will be
created if it does not exist, or the value will be replaced if
the attribute already exists. To modify these semantics, one of
the following values can be specified in flags:
XATTR_CREATE
Perform a pure create, which fails if the named attribute
exists already.
XATTR_REPLACE
Perform a pure replace operation, which fails if the named
attribute does not already exist.
Возвращаемое значение (Return value)
On success, zero is returned. On failure, -1 is returned and
errno is set to indicate the error.
Ошибки (Error)
EDQUOT Disk quota limits meant that there is insufficient space
remaining to store the extended attribute.
EEXIST XATTR_CREATE was specified, and the attribute exists
already.
ENODATA
XATTR_REPLACE was specified, and the attribute does not
exist.
ENOSPC There is insufficient space remaining to store the
extended attribute.
ENOTSUP
The namespace prefix of name is not valid.
ENOTSUP
Extended attributes are not supported by the filesystem,
or are disabled,
EPERM The file is marked immutable or append-only. (See
ioctl_iflags(2).)
In addition, the errors documented in stat(2) can also occur.
ERANGE The size of name or value exceeds a filesystem-specific
limit.
Версии (Versions)
These system calls have been available on Linux since kernel 2.4;
glibc support is provided since version 2.3.
Стандарты (Conforming to)
These system calls are Linux-specific.
Смотри также (See also)
getfattr(1), setfattr(1), getxattr(2), listxattr(2), open(2),
removexattr(2), stat(2), symlink(7), xattr(7)
