guile-hurd/hurd/fs/file-reparent.lisp

(in-package :hurd)

(defcfun ("file_reparent" %file-reparent)
  err
  (file port)
  (parent port)
  (new-file port-pointer))

(defun file-reparent (file parent)
  "Return a new port for 'file' that lookups parent to 'parent'."
  (declare (type fixnum file parent))
  (with-foreign-pointer (new-file (foreign-type-size 'port))
    (select-error (%file-reparent file parent new-file)
				  (mem-ref new-file 'port))))