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SETXATTR(2)                Linux Programmer's Manual               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 fd, const char *name,
                     const void *value, size_t size, int flags);

       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 sym-
       bolic 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 names-
       paces  associated  with  an individual inode.  The value of an extended
       attribute is a chunk of arbitrary textual or binary data  of  specified

       The  flags  argument  can be used to refine the semantics of the opera-
       tion.  XATTR_CREATE specifies a pure create, which fails if  the  named
       attribute exists already.  XATTR_REPLACE specifies a pure replace oper-
       ation, 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  enforce-
       ment 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

       These system calls have been available on Linux since kernel 2.4; glibc
       support is provided since version 2.3.

       These system calls are Linux-specific.

       getfattr(1), setfattr(1), getxattr(2), listxattr(2), open(2),  removex-
       attr(2), stat(2), attr(5), symlink(7)

       This  page  is  part of release 3.25 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/.

Linux                             2001-12-31                       SETXATTR(2)

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