50 lines
1.7 KiB
Scheme
50 lines
1.7 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; 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 (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix gcrypt)
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#:use-module (guix config)
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#:use-module (system foreign)
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#:export (gcrypt-version
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libgcrypt-func))
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;;; Commentary:
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;;;
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;;; Common code for the GNU Libgcrypt bindings. Loading this module
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;;; initializes Libgcrypt as a side effect.
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;;;
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;;; Code:
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(define libgcrypt-func
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(let ((lib (dynamic-link %libgcrypt)))
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(lambda (func)
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"Return a pointer to symbol FUNC in libgcrypt."
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(dynamic-func func lib))))
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(define gcrypt-version
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;; According to the manual, this function must be called before any other,
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;; and it's not clear whether it can be called more than once. So call it
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;; right here from the top level.
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(let* ((ptr (libgcrypt-func "gcry_check_version"))
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(proc (pointer->procedure '* ptr '(*)))
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(version (pointer->string (proc %null-pointer))))
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(lambda ()
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"Return the version number of libgcrypt as a string."
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version)))
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;;; gcrypt.scm ends here
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