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43f8006f5c
* tests/gpgscm/ffi.scm (throw): Run *run-atexit-handlers* when terminating the interpreter. (*atexit-handlers*): New variable. (*run-atexit-handlers*): New function. (atexit): Likewise. * tests/gpgscm/main.c (main): Run *run-atexit-handlers* at normal interpreter shutdown. Signed-off-by: Justus Winter <justus@g10code.com>
85 lines
2.8 KiB
Scheme
85 lines
2.8 KiB
Scheme
;; FFI interface for TinySCHEME.
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;;
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;; Copyright (C) 2016 g10 Code GmbH
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;;
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;; This file is part of GnuPG.
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;;
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;; GnuPG is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; GnuPG is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, see <http://www.gnu.org/licenses/>.
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;; Foreign function wrapper. Expects F to return a list with the
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;; first element being the `error_t' value returned by the foreign
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;; function. The error is thrown, or the cdr of the result is
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;; returned.
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(define (ffi-apply name f args)
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(let ((result (apply f args)))
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(cond
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((string? result)
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(ffi-fail name args result))
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((not (= (car result) 0))
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(ffi-fail name args (strerror (car result))))
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((and (= (car result) 0) (pair? (cdr result))) (cadr result))
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((= (car result) 0) '())
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(else
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(throw (list "Result violates FFI calling convention: " result))))))
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(define (ffi-fail name args message)
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(let ((args' (open-output-string)))
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(write (cons (string->symbol name) args) args')
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(throw (string-append
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(get-output-string args') ": " message))))
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;; Pseudo-definitions for foreign functions. Evaluates to no code,
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;; but serves as documentation.
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(macro (ffi-define form))
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;; Runtime support.
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;; Low-level mechanism to terminate the process.
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(ffi-define (_exit status))
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;; High-level mechanism to terminate the process is to throw an error
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;; of the form (*interpreter-exit* status). This gives automatic
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;; resource management a chance to clean up.
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(define *interpreter-exit* (gensym))
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(define (throw . x)
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(cond
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((more-handlers?)
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(apply (pop-handler) x))
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((and (= 2 (length x)) (equal? *interpreter-exit* (car x)))
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(*run-atexit-handlers*)
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(_exit (cadr x)))
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(else
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(apply error x))))
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;; Terminate the process returning STATUS to the parent.
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(define (exit status)
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(throw *interpreter-exit* status))
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;; A list of functions run at interpreter shutdown.
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(define *atexit-handlers* (list))
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;; Execute all these functions.
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(define (*run-atexit-handlers*)
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(unless (null? *atexit-handlers*)
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(let ((proc (car *atexit-handlers*)))
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;; Drop proc from the list so that it will not get
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;; executed again even if it raises an exception.
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(set! *atexit-handlers* (cdr *atexit-handlers*))
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(proc)
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(*run-atexit-handlers*))))
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;; Register a function to be run at interpreter shutdown.
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(define (atexit proc)
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(set! *atexit-handlers* (cons proc *atexit-handlers*)))
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