SETXATTR(2)                Linux Programmer's Manual               SETXATTR(2)

       setxattr, lsetxattr, fsetxattr - set an extended attribute value

       #include <sys/types.h>
       #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);

       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  argu-
       ment  specifies  the  size  (in bytes) of value; a zero-length value is

       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 null-terminated string.  The  name  in-
       cludes  a  namespace  prefix; there may be several, disjoint namespaces
       associated with an individual inode.  The value of an  extended  attri-
       bute  is  a  chunk  of  arbitrary  textual  or binary data of specified

       By default (i.e., flags is zero), the extended attribute will  be  cre-
       ated  if it does not exist, or the value will be replaced if the attri-
       bute already exists.  To modify these semantics, one of  the  following
       values can be specified in flags:

              Perform a pure create, which fails if the named attribute exists

              Perform a pure replace operation, which fails if the  named  at-
              tribute does not already exist.

       On  success, zero is returned.  On failure, -1 is returned and errno is
       set appropriately.

       EDQUOT Disk quota limits meant that there is insufficient space remain-
              ing to store the extended attribute.

       EEXIST XATTR_CREATE was specified, and the attribute exists already.

              XATTR_REPLACE was specified, and the attribute does not exist.

       ENOSPC There  is insufficient space remaining to store the extended at-

              The namespace prefix of name is not valid.

              Extended attributes are not supported by the filesystem, or  are

       EPERM  The   file   is   marked   immutable   or   append-only.    (See

       In addition, the errors documented in stat(2) can also occur.

       ERANGE The size of name or value exceeds a filesystem-specific limit.

       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), symlink(7), xattr(7)

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Linux                             2019-08-02                       SETXATTR(2)
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