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libattr1-dev - Extended attribute static libraries and headers…  more info»


SETXATTR(2)                 System calls                 SETXATTR(2)

       setxattr,  lsetxattr,  fsetxattr  - set an extended attribute

       #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 exten‐
       sions 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

       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  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.

       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 speci‐
       fied, and the attribute does  not  exist,  errno  is  set  to

       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)
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