code: def htmlCtxtReadFd(self, fd, URL, encoding, options):
          
          ret = libxml2mod.htmlCtxtReadFd(self._o, fd, URL, encoding, options)
          if ret is None:raise treeError('htmlCtxtReadFd() failed')
          __tmp = xmlDoc(_obj=ret)
          return __tmp
docs: parse an XML from a file descriptor and build a tree. This
             reuses the existing @ctxt parser context