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Marius Vollmer
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2 changed files with 221 additions and 0 deletions
157
libguile/extensions.c
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157
libguile/extensions.c
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/* extensions.c - registering and loading extensions.
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*
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* Copyright (C) 2001 Free Software Foundation, Inc.
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*
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* This program 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 2, or (at your option)
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* any later version.
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*
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* This program 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 software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "libguile/_scm.h"
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#include "libguile/strings.h"
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#include "libguile/gc.h"
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#include "libguile/dynl.h"
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#include "libguile/extensions.h"
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struct extension {
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struct extension *next;
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const char *lib;
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const char *init;
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void (*func)(void *);
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void *data;
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};
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static struct extension *registered_extensions;
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void
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scm_c_register_extension (const char *lib, const char *init,
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void (*func) (void *), void *data)
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{
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struct extension *ext = scm_must_malloc (sizeof(struct extension),
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"scm_register_extension");
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ext->lib = scm_must_strdup (lib);
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ext->init = scm_must_strdup (init);
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ext->func = func;
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ext->data = data;
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ext->next = registered_extensions;
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registered_extensions = ext;
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}
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static void
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load_extension (SCM lib, SCM init)
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{
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/* Search the registry. */
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{
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struct extension *ext;
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for (ext = registered_extensions; ext; ext = ext->next)
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if (!strcmp (ext->lib, SCM_STRING_CHARS (lib))
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&& !strcmp (ext->init, SCM_STRING_CHARS (init)))
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{
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ext->func (ext->data);
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return;
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}
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}
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/* Dynamically link the library. */
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scm_dynamic_call (init, scm_dynamic_link (lib));
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}
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void
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scm_c_load_extension (const char *lib, const char *init)
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{
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load_extension (scm_makfrom0str (lib), scm_makfrom0str (init));
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}
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SCM_DEFINE (scm_load_extension, "load-extension", 2, 0, 0,
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(SCM lib, SCM init),
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"Load and initilize the extension designated by LIB and INIT."
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"When there is no pre-registered function for LIB/INIT, this is "
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"equivalent to "
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" "
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" (dynamic-call INIT (dynamic-link LIB)) "
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" "
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"When there is a pre-registered function, that function is called "
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"instead. "
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" "
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"Normally, there is no pre-registered function. This option exists "
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"only for situations where dynamic linking is unavailable or unwanted. "
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"In that case, you would statically link your program with the desired "
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"library, and register its init function right after Guile has been "
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"initialized. "
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" "
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"LIB should be a string denoting a shared library without any file type "
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"suffix such as \".so\". The suffix is provided automatically. It "
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"should also not contain any directory components. Libraries that "
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"implement Guile Extensions should be put into the normal locations for "
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"shared libraries. We recommend to use the naming convention "
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"libguile-bla-blum for a extension related to a module `(bla blum)'. "
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" "
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"The normal way for a extension to be used is to write a small Scheme "
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"file that defines a module, and to load the extension into this "
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"module. When the module is auto-loaded, the extension is loaded as "
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"well. For example, "
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" "
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" (define-module (bla blum)) "
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" "
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" (load-extension \"libguile-bla-blum\" \"bla_init_blum\")")
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#define FUNC_NAME s_scm_load_extension
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{
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SCM_VALIDATE_STRING (1, lib);
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SCM_VALIDATE_STRING (2, init);
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load_extension (lib, init);
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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void
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scm_init_extensions ()
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{
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registered_extensions = NULL;
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#ifndef SCM_MAGIC_SNARFER
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#include "libguile/extensions.x"
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#endif
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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64
libguile/extensions.h
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64
libguile/extensions.h
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@ -0,0 +1,64 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc.
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*
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* This program 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 2, or (at your option)
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* any later version.
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*
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* This program 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 software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#ifndef LIBGUILE_EXTENSIONS_H
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#define LIBGUILE_EXTENSIONS_H
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#include "libguile/__scm.h"
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extern void scm_c_register_extension (const char *lib, const char *init,
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void (*func) (void *), void *data);
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extern void scm_c_load_extension (const char *lib, const char *init);
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extern SCM scm_load_extension (SCM lib, SCM init);
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void scm_init_extensions (void);
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#endif /* LIBGUILE_EXTENSIONS_H */
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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