glib/gmodule/gmodule.h

/* GMODULE - GLIB wrapper code for dynamic module loading
 * Copyright (C) 1998 Tim Janik
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GLib Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GLib at ftp://ftp.gtk.org/pub/gtk/. 
 */

#ifndef __GMODULE_H__
#define __GMODULE_H__

#include <glib.h>

G_BEGIN_DECLS

/* exporting and importing functions, this is special cased
 * to feature Windows dll stubs.
 */
#define	G_MODULE_IMPORT		extern
#ifdef G_PLATFORM_WIN32
#  define	G_MODULE_EXPORT		__declspec(dllexport)
#else /* !G_PLATFORM_WIN32 */
#  define	G_MODULE_EXPORT
#endif /* !G_PLATFORM_WIN32 */

typedef enum
{
  G_MODULE_BIND_LAZY	= 1 << 0,
  G_MODULE_BIND_LOCAL	= 1 << 1,
  G_MODULE_BIND_MASK	= 0x03
} GModuleFlags;

typedef	struct _GModule			 GModule;
typedef const gchar* (*GModuleCheckInit) (GModule	*module);
typedef void	     (*GModuleUnload)	 (GModule	*module);

#ifdef G_OS_WIN32
#define g_module_open g_module_open_utf8
#define g_module_name g_module_name_utf8
#endif

/* return TRUE if dynamic module loading is supported */
gboolean	g_module_supported	   (void) G_GNUC_CONST;

/* open a module `file_name' and return handle, which is NULL on error */
GModule*              g_module_open          (const gchar  *file_name,
					      GModuleFlags  flags);

/* close a previously opened module, returns TRUE on success */
gboolean              g_module_close         (GModule      *module);

/* make a module resident so g_module_close on it will be ignored */
void                  g_module_make_resident (GModule      *module);

/* query the last module error as a string */
G_CONST_RETURN gchar* g_module_error         (void);

/* retrieve a symbol pointer from `module', returns TRUE on success */
gboolean              g_module_symbol        (GModule      *module,
					      const gchar  *symbol_name,
					      gpointer     *symbol);

/* retrieve the file name from an existing module */
G_CONST_RETURN gchar* g_module_name          (GModule      *module);

/* Build the actual file name containing a module. `directory' is the
 * directory where the module file is supposed to be, or NULL or empty
 * in which case it should either be in the current directory or, on
 * some operating systems, in some standard place, for instance on the
 * PATH. Hence, to be absoultely sure to get the correct module,
 * always pass in a directory. The file name consists of the directory,
 * if supplied, and `module_name' suitably decorated accoring to
 * the operating system's conventions (for instance lib*.so or *.dll).
 *
 * No checks are made that the file exists, or is of correct type.
 */
gchar*                g_module_build_path    (const gchar  *directory,
					      const gchar  *module_name);


G_END_DECLS

#endif /* __GMODULE_H__ */