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 #elif __GNUC__ >= 4
  39 #  define       G_MODULE_EXPORT         __attribute__((visibility("default")))
  40 #else /* !G_PLATFORM_WIN32 && __GNUC__ < 4 */
  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 /* return TRUE if dynamic module loading is supported */
  56 GLIB_AVAILABLE_IN_ALL
  57 gboolean        g_module_supported         (void) G_GNUC_CONST;
  58
  59 /* open a module 'file_name' and return handle, which is NULL on error */
  60 GLIB_AVAILABLE_IN_ALL
  61 GModule*              g_module_open          (const gchar  *file_name,
  62                                               GModuleFlags  flags);
  63
  64 /* close a previously opened module, returns TRUE on success */
  65 GLIB_AVAILABLE_IN_ALL
  66 gboolean              g_module_close         (GModule      *module);
  67
  68 /* make a module resident so g_module_close on it will be ignored */
  69 GLIB_AVAILABLE_IN_ALL
  70 void                  g_module_make_resident (GModule      *module);
  71
  72 /* query the last module error as a string */
  73 GLIB_AVAILABLE_IN_ALL
  74 const gchar *         g_module_error         (void);
  75
  76 /* retrieve a symbol pointer from 'module', returns TRUE on success */
  77 GLIB_AVAILABLE_IN_ALL
  78 gboolean              g_module_symbol        (GModule      *module,
  79                                               const gchar  *symbol_name,
  80                                               gpointer     *symbol);
  81
  82 /* retrieve the file name from an existing module */
  83 GLIB_AVAILABLE_IN_ALL
  84 const gchar *         g_module_name          (GModule      *module);
  85
  86 /* Build the actual file name containing a module. 'directory' is the
  87  * directory where the module file is supposed to be, or NULL or empty
  88  * in which case it should either be in the current directory or, on
  89  * some operating systems, in some standard place, for instance on the
  90  * PATH. Hence, to be absoultely sure to get the correct module,
  91  * always pass in a directory. The file name consists of the directory,
  92  * if supplied, and 'module_name' suitably decorated according to
  93  * the operating system's conventions (for instance lib*.so or *.dll).
  94  *
  95  * No checks are made that the file exists, or is of correct type.
  96  */
  97 GLIB_AVAILABLE_IN_ALL
  98 gchar*                g_module_build_path    (const gchar  *directory,
  99                                               const gchar  *module_name);
 100
 101
 102 #ifndef __GTK_DOC_IGNORE__
 103 #ifdef G_OS_WIN32
 104 #define g_module_open g_module_open_utf8
 105 #define g_module_name g_module_name_utf8
 106
 107 GLIB_AVAILABLE_IN_ALL
 108 GModule *    g_module_open_utf8 (const gchar  *file_name,
 109                                  GModuleFlags  flags);
 110 GLIB_AVAILABLE_IN_ALL
 111 const gchar *g_module_name_utf8 (GModule      *module);
 112 #endif
 113 #endif
 114
 115 G_END_DECLS
 116
 117 #endif /* __GMODULE_H__ */