mirror of git://git.gnupg.org/gnupg.git
52 lines
1.8 KiB
Scheme
52 lines
1.8 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 (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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;; Get the current time in seconds since the epoch.
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(ffi-define (get-time))
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