gmodule/gmodule.h

   1 /* GMODULE - GLIB wrapper code for dynamic module loading
   2  * Copyright (C) 1998 Tim Janik
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #ifndef __GMODULE_H__
  28 #define __GMODULE_H__
  29
  30 #include <glib.h>
  31
  32 G_BEGIN_DECLS
  33
  34 /* exporting and importing functions, this is special cased
  35  * to feature Windows dll stubs.
  36  */
  37 #define G_MODULE_IMPORT         extern
  38 #ifdef G_PLATFORM_WIN32
  39 #  define       G_MODULE_EXPORT         __declspec(dllexport)
  40 #else /* !G_PLATFORM_WIN32 */
  41 #  define       G_MODULE_EXPORT
  42 #endif /* !G_PLATFORM_WIN32 */
  43
  44 typedef enum
  45 {
  46   G_MODULE_BIND_LAZY    = 1 << 0,
  47   G_MODULE_BIND_LOCAL   = 1 << 1,
  48   G_MODULE_BIND_MASK    = 0x03
  49 } GModuleFlags;
  50
  51 typedef struct _GModule                  GModule;
  52 typedef const gchar* (*GModuleCheckInit) (GModule       *module);
  53 typedef void         (*GModuleUnload)    (GModule       *module);
  54
  55 #ifdef G_OS_WIN32
  56 #define g_module_open g_module_open_utf8
  57 #define g_module_name g_module_name_utf8
  58 #endif
  59
  60 /* return TRUE if dynamic module loading is supported */
  61 gboolean        g_module_supported         (void) G_GNUC_CONST;
  62
  63 /* open a module `file_name' and return handle, which is NULL on error */
  64 GModule*              g_module_open          (const gchar  *file_name,
  65                                               GModuleFlags  flags);
  66
  67 /* close a previously opened module, returns TRUE on success */
  68 gboolean              g_module_close         (GModule      *module);
  69
  70 /* make a module resident so g_module_close on it will be ignored */
  71 void                  g_module_make_resident (GModule      *module);
  72
  73 /* query the last module error as a string */
  74 G_CONST_RETURN gchar* g_module_error         (void);
  75
  76 /* retrieve a symbol pointer from `module', returns TRUE on success */
  77 gboolean              g_module_symbol        (GModule      *module,
  78                                               const gchar  *symbol_name,
  79                                               gpointer     *symbol);
  80
  81 /* retrieve the file name from an existing module */
  82 G_CONST_RETURN gchar* g_module_name          (GModule      *module);
  83
  84 /* Build the actual file name containing a module. `directory' is the
  85  * directory where the module file is supposed to be, or NULL or empty
  86  * in which case it should either be in the current directory or, on
  87  * some operating systems, in some standard place, for instance on the
  88  * PATH. Hence, to be absoultely sure to get the correct module,
  89  * always pass in a directory. The file name consists of the directory,
  90  * if supplied, and `module_name' suitably decorated accoring to
  91  * the operating system's conventions (for instance lib*.so or *.dll).
  92  *
  93  * No checks are made that the file exists, or is of correct type.
  94  */
  95 gchar*                g_module_build_path    (const gchar  *directory,
  96                                               const gchar  *module_name);
  97
  98
  99 G_END_DECLS
 100
 101 #endif /* __GMODULE_H__ */