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diff --git a/tests/gpgscm/ffi.scm b/tests/gpgscm/ffi.scm
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+;; FFI interface for TinySCHEME.
+;;
+;; Copyright (C) 2016 g10 Code GmbH
+;;
+;; This file is part of GnuPG.
+;;
+;; GnuPG is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; GnuPG is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+;; Foreign function wrapper.  Expects F to return a list with the
+;; first element being the `error_t' value returned by the foreign
+;; function.  The error is thrown, or the cdr of the result is
+;; returned.
+(define (ffi-apply name f args)
+  (let ((result (apply f args)))
+    (cond
+     ((string? result)
+      (ffi-fail name args result))
+     ((not (= (car result) 0))
+      (ffi-fail name args (strerror (car result))))
+     ((and (= (car result) 0) (pair? (cdr result))) (cadr result))
+     ((= (car result) 0) '())
+     (else
+      (throw (list "Result violates FFI calling convention: " result))))))
+
+(define (ffi-fail name args message)
+  (let ((args' (open-output-string)))
+    (write (cons (string->symbol name) args) args')
+    (throw (get-output-string args') message)))
+
+;; Pseudo-definitions for foreign functions.  Evaluates to no code,
+;; but serves as documentation.
+(macro (ffi-define form))
+
+;; Runtime support.
+
+;; Low-level mechanism to terminate the process.
+(ffi-define (_exit status))
+
+;; Get the current time in seconds since the epoch.
+(ffi-define (get-time))