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SETXATTR(2)                      System calls                      SETXATTR(2)

       setxattr, lsetxattr, fsetxattr - set an extended attribute value

       #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);

       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 operation.  XATTR_CREATE specifies a  pure  cre-
       ate,  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.

       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.

       Andreas  Gruenbacher,  <>  and  the SGI XFS development team, <>.
       Please send any bug reports or comments to these addresses.

       getfattr(1), setfattr(1), open(2), stat(2), getxattr(2), listxattr(2), removexattr(2), and attr(5).

Dec 2001                      Extended Attributes                  SETXATTR(2)