mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-11 21:48:50 +01:00
7b4e2ea274
* tests/gpgscm/ffi.scm: Set '*error-hook*' again so that the interpreter will use our function. Signed-off-by: Justus Winter <justus@g10code.com>
86 lines
2.9 KiB
Scheme
86 lines
2.9 KiB
Scheme
;; 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 (string-append
|
|
(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))
|
|
|
|
;; High-level mechanism to terminate the process is to throw an error
|
|
;; of the form (*interpreter-exit* status). This gives automatic
|
|
;; resource management a chance to clean up.
|
|
(define *interpreter-exit* (gensym))
|
|
(define (throw . x)
|
|
(cond
|
|
((more-handlers?)
|
|
(apply (pop-handler) x))
|
|
((and (= 2 (length x)) (equal? *interpreter-exit* (car x)))
|
|
(*run-atexit-handlers*)
|
|
(_exit (cadr x)))
|
|
(else
|
|
(apply error x))))
|
|
(set! *error-hook* throw)
|
|
|
|
;; Terminate the process returning STATUS to the parent.
|
|
(define (exit status)
|
|
(throw *interpreter-exit* status))
|
|
|
|
;; A list of functions run at interpreter shutdown.
|
|
(define *atexit-handlers* (list))
|
|
|
|
;; Execute all these functions.
|
|
(define (*run-atexit-handlers*)
|
|
(unless (null? *atexit-handlers*)
|
|
(let ((proc (car *atexit-handlers*)))
|
|
;; Drop proc from the list so that it will not get
|
|
;; executed again even if it raises an exception.
|
|
(set! *atexit-handlers* (cdr *atexit-handlers*))
|
|
(proc)
|
|
(*run-atexit-handlers*))))
|
|
|
|
;; Register a function to be run at interpreter shutdown.
|
|
(define (atexit proc)
|
|
(set! *atexit-handlers* (cons proc *atexit-handlers*)))
|