x                  Resultant value of the configuration attribute
                       specified in name.
    -1                 Indicates an error; errno is set to one of the
                       following values:

                       o  EACCES - Search permission is denied for a
                          component of the path prefix.

                       o  EINVAL - The name argument specifies an
                          unknown or inapplicable characteristic.

                       o  EFAULT - The path argument is an invalid
                          address.

                       o  ENAMETOOLONG - The length of the path
                          string exceeds PATH_MAX or a pathname
                          component is longer than NAME_MAX.

                       o  ENOENT - The named file does not exist
                          or the path argument points to an empty
                          string.

                       o  ENOTDI - A component of the path prefix is
                          not a directory.