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_gio_module_get_default() is a very convenient function for modules implementing a singleton -- it finds the default module by priority subject to override by a given environment variable name, instantiates it, and caches the instance for future calls. It also has the ability to query instances for being 'active' using a callback. It doesn't work very well for non-singletons (like file monitors). Add a new function _gio_module_get_default_type() that skips the instantiation, returning the GType instead. As a replacement for the 'active' callback, a vtable offset can be given for a virtual function to use to query if a particular backend is supported. https://bugzilla.gnome.org/show_bug.cgi?id=592211
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* 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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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#ifndef __G_IO_MODULE_PRIV_H__
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#define __G_IO_MODULE_PRIV_H__
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#include "giomodule.h"
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G_BEGIN_DECLS
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void _g_io_modules_ensure_extension_points_registered (void);
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void _g_io_modules_ensure_loaded (void);
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typedef gboolean (*GIOModuleVerifyFunc) (gpointer);
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gpointer _g_io_module_get_default (const gchar *extension_point,
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const gchar *envvar,
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GIOModuleVerifyFunc verify_func);
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GType _g_io_module_get_default_type (const gchar *extension_point,
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const gchar *envvar,
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guint is_supported_offset);
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#ifdef G_PLATFORM_WIN32
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void *_g_io_win32_get_module (void);
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#endif
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G_END_DECLS
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#endif /* __G_IO_MODULE_PRIV_H__ */
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