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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  20  * file for a list of people on the GLib Team.  See the ChangeLog
  21  * files for a list of changes.  These files are distributed with
  22  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  23  */
  24
  25 #ifndef __GMODULE_H__
  26 #define __GMODULE_H__
  27
  28 #include <glib.h>
  29
  30 G_BEGIN_DECLS
  31
  32 /* exporting and importing functions, this is special cased
  33  * to feature Windows dll stubs.
  34  */
  35 #define G_MODULE_IMPORT         extern
  36 #ifdef G_PLATFORM_WIN32
  37 #  define       G_MODULE_EXPORT         __declspec(dllexport)
  38 #else /* !G_PLATFORM_WIN32 */
  39 #  define       G_MODULE_EXPORT
  40 #endif /* !G_PLATFORM_WIN32 */
  41
  42 typedef enum
  43 {
  44   G_MODULE_BIND_LAZY    = 1 << 0,
  45   G_MODULE_BIND_LOCAL   = 1 << 1,
  46   G_MODULE_BIND_MASK    = 0x03
  47 } GModuleFlags;
  48
  49 typedef struct _GModule                  GModule;
  50 typedef const gchar* (*GModuleCheckInit) (GModule       *module);
  51 typedef void         (*GModuleUnload)    (GModule       *module);
  52
  53 /* return TRUE if dynamic module loading is supported */
  54 GLIB_AVAILABLE_IN_ALL
  55 gboolean        g_module_supported         (void) G_GNUC_CONST;
  56
  57 /* open a module 'file_name' and return handle, which is NULL on error */
  58 GLIB_AVAILABLE_IN_ALL
  59 GModule*              g_module_open          (const gchar  *file_name,
  60                                               GModuleFlags  flags);
  61
  62 /* close a previously opened module, returns TRUE on success */
  63 GLIB_AVAILABLE_IN_ALL
  64 gboolean              g_module_close         (GModule      *module);
  65
  66 /* make a module resident so g_module_close on it will be ignored */
  67 GLIB_AVAILABLE_IN_ALL
  68 void                  g_module_make_resident (GModule      *module);
  69
  70 /* query the last module error as a string */
  71 GLIB_AVAILABLE_IN_ALL
  72 const gchar *         g_module_error         (void);
  73
  74 /* retrieve a symbol pointer from 'module', returns TRUE on success */
  75 GLIB_AVAILABLE_IN_ALL
  76 gboolean              g_module_symbol        (GModule      *module,
  77                                               const gchar  *symbol_name,
  78                                               gpointer     *symbol);
  79
  80 /* retrieve the file name from an existing module */
  81 GLIB_AVAILABLE_IN_ALL
  82 const 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 according 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 GLIB_AVAILABLE_IN_ALL
  96 gchar*                g_module_build_path    (const gchar  *directory,
  97                                               const gchar  *module_name);
  98
  99
 100 #ifndef __GTK_DOC_IGNORE__
 101 #ifdef G_OS_WIN32
 102 #define g_module_open g_module_open_utf8
 103 #define g_module_name g_module_name_utf8
 104
 105 GLIB_AVAILABLE_IN_ALL
 106 GModule *    g_module_open_utf8 (const gchar  *file_name,
 107                                  GModuleFlags  flags);
 108 GLIB_AVAILABLE_IN_ALL
 109 const gchar *g_module_name_utf8 (GModule      *module);
 110 #endif
 111 #endif
 112
 113 G_END_DECLS
 114
 115 #endif /* __GMODULE_H__ */