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CentOS 7.0 - man page for attr_getf (centos section 3)

ATTR_GET(3)			      XFS Compatibility API			      ATTR_GET(3)

NAME
       attr_get, attr_getf - get the value of a user attribute of a filesystem object

C SYNOPSIS
       #include <attr/attributes.h>

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

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

DESCRIPTION
       The attr_get and attr_getf functions provide a way to retrieve the value of an attribute.

       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 exists, the value  associated  with  it
       will  be  copied  into  the attrvalue buffer.  The valuelength argument is an input/output
       argument that on the call to attr_get should contain the maximum size of  attribute  value
       the  process  is willing to accept.  On return, the valuelength will have been modified to
       show the actual size of the attribute value returned.  The flags argument can contain  the
       following symbols bitwise OR'ed together:

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

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

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

       [ENOATTR]	The  attribute name given is not associated with the indicated filesystem
			object.

       [E2BIG]		The value of the given attribute is too large to  fit  into  the  buffer.
			The  integer that the valuelength argument points to has been modified to
			show the actual number of bytes that would be required to store the value
			of that attribute.

       [ENOENT] 	The named file does not exist.

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

       [EFAULT] 	Path,  attrname,  attrvalue,  or valuelength points outside the allocated
			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_getf will fail if:

       [ENOATTR]      The  attribute  name  given is not associated with the indicated filesystem
		      object.

       [E2BIG]	      The value of the given attribute is too large to fit into the buffer.   The
		      integer  that  the valuelength argument points to has been modified to show
		      the actual numnber of bytes that would be required to store  the	value  of
		      that attribute.

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

       [EFAULT]       Attrname, attrvalue, or valuelength 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_list(3), attr_multi(3), attr_remove(3), and attr_set(3).

Dec 2001			       Extended Attributes			      ATTR_GET(3)


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