attr_set man page on Archlinux

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ATTR_SET(3)		     XFS Compatibility API		   ATTR_SET(3)

NAME
       attr_set, attr_setf - set the value of a user attribute of a filesystem
       object

C SYNOPSIS
       #include <attr/attributes.h>

       int attr_set (const char *path, const char *attrname,
		     const char *attrvalue, const int valuelength,
		     int flags);

       int attr_setf (int fd, const char *attrname,
		      const char *attrvalue, const int valuelength,
		      int flags);

DESCRIPTION
       The attr_set and attr_setf functions provide a way to create attributes
       and set/change their values.

       Path  points  to	 a path name for a filesystem object, and fd refers to
       the file descriptor associated with a file.  If the attribute  attrname
       does not exist, an attribute with the given name and value will be cre‐
       ated and associated with	 that  indicated  filesystem  object.	If  an
       attribute  with that name already exists on that filesystem object, the
       existing value is replaced with the new value given in this call.   The
       new  attribute value is copied from the attrvalue buffer for a total of
       valuelength bytes.  The flags argument can contain the  following  sym‐
       bols bitwise OR'ed together:

       ATTR_ROOT
	      Look  for	 attrname  in  the root address space, not in the user
	      address space.  (limited to use by super-user only)

       ATTR_DONTFOLLOW
	      Do not follow  symbolic  links  when  resolving  a  path	on  an
	      attr_set	function  call.	  The  default	is  to follow symbolic
	      links.

       ATTR_CREATE
	      Return an error (EEXIST) if  an  attribute  of  the  given  name
	      already  exists  on  the	indicated filesystem object, otherwise
	      create an attribute with the given name and value.  This flag is
	      used  to	implement  a  pure create operation, without this flag
	      attr_set will create the attribute if it does not already exist.
	      An  error	 (EINVAL)  will	 be  returned  if both ATTR_CREATE and
	      ATTR_REPLACE are set in the same call.

       ATTR_REPLACE
	      Return an error (ENOATTR) if an attribute of the given name does
	      not  already exist on the indicated filesystem object, otherwise
	      replace the existing attribute´s value  with  the	 given	value.
	      This  flag  is  used  to implement a pure replacement operation,
	      without this flag attr_set will create the attribute if it  does
	      not  already  exist.  An error (EINVAL) will be returned if both
	      ATTR_CREATE and ATTR_REPLACE are set in the same call.

       attr_set will fail if one or more of the following are true:

       [ENOATTR]	The attribute name given is not	 associated  with  the
			indicated  filesystem object and the ATTR_REPLACE flag
			bit was set.

       [E2BIG]		The value of the given	attribute  is  too  large,  it
			exceeds	 the  maximum  allowable  size of an attribute
			value.

       [EEXIST]		The attribute name given is  already  associated  with
			the  indicated	filesystem  object and the ATTR_CREATE
			flag bit was set.

       [ENOENT]		The named file does not exist.

       [EPERM]		The effective user ID does not match the owner of  the
			file and the effective user ID is not super-user.

       [ENOTDIR]	A component of the path prefix is not a directory.

       [EACCES]		Search permission is denied on a component of the path
			prefix.

       [EINVAL]		A bit was set in the flag argument that is not defined
			for  this  system  call,  or  both the ATTR_CREATE and
			ATTR_REPLACE flags bits were set.

       [EFAULT]		Path, attrname, or attrvalue points outside the	 allo‐
			cated address space of the process.

       [ELOOP]		A path name lookup involved too many symbolic links.

       [ENAMETOOLONG]	The length of path exceeds {MAXPATHLEN}, or a pathname
			component is longer than {MAXNAMELEN}.

       attr_setf will fail if:

       [ENOATTR]      The attribute name given	is  not	 associated  with  the
		      indicated	 filesystem  object  and the ATTR_REPLACE flag
		      bit was set.

       [E2BIG]	      The value of  the	 given	attribute  is  too  large,  it
		      exceeds  the  maximum  allowable	size  of  an attribute
		      value.

       [EEXIST]	      The attribute name given is already associated with  the
		      indicated filesystem object and the ATTR_CREATE flag bit
		      was set.

       [EINVAL]	      A bit was set in the flag argument that is  not  defined
		      for  this	 system	 call,	or  both  the  ATTR_CREATE and
		      ATTR_REPLACE flags bits were set,	 or  fd	 refers	 to  a
		      socket, not a file.

       [EFAULT]	      Attrname,	 or  attrvalue	points	outside	 the allocated
		      address space of the process.

       [EBADF]	      Fd does not refer to a valid descriptor.

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

SEE ALSO
       attr(1), attr_get(3), attr_list(3), attr_multi(3), and attr_remove(3).

Dec 2001		      Extended Attributes		   ATTR_SET(3)
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