1 /* GMODULE - GLIB wrapper code for dynamic module loading
2 * Copyright (C) 1998 Tim Janik
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library 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.
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 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library 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.
20 #include "gmoduleconf.h"
25 /* We maintain a list of modules, so we can reference count them.
26 * That's needed because some platforms don't support refernce counts on
27 * modules e.g. the shl_* implementation of HP-UX
28 * (http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html).
29 * Also, the module for the program itself is kept seperatedly for
30 * faster access and because it has special semantics.
34 /* --- structures --- */
40 guint is_resident : 1;
46 /* --- prototypes --- */
47 static gpointer _g_module_open (const gchar *file_name,
49 static void _g_module_close (gpointer handle,
51 static gpointer _g_module_self (void);
52 static gpointer _g_module_symbol (gpointer handle,
53 const gchar *symbol_name);
54 static gchar* _g_module_build_path (const gchar *directory,
55 const gchar *module_name);
56 static inline void g_module_set_error (const gchar *error);
57 static inline GModule* g_module_find_by_handle (gpointer handle);
58 static inline GModule* g_module_find_by_name (const gchar *name);
61 /* --- variables --- */
62 const char *g_log_domain_gmodule = "GModule";
63 static GModule *modules = NULL;
64 static GModule *main_module = NULL;
65 static gchar *module_error = NULL;
68 /* --- inline functions --- */
69 static inline GModule*
70 g_module_find_by_handle (gpointer handle)
74 if (main_module && main_module->handle == handle)
77 for (module = modules; module; module = module->next)
78 if (handle == module->handle)
83 static inline GModule*
84 g_module_find_by_name (const gchar *name)
88 for (module = modules; module; module = module->next)
89 if (strcmp (name, module->file_name) == 0)
95 g_module_set_error (const gchar *error)
98 g_free (module_error);
100 module_error = g_strdup (error);
107 /* --- include platform specifc code --- */
108 #define CHECK_ERROR(rv) { g_module_set_error (NULL); }
109 #if (G_MODULE_IMPL == G_MODULE_IMPL_DL)
110 #include "gmodule-dl.c"
111 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DLD)
112 #include "gmodule-dld.c"
113 #elif (G_MODULE_IMPL == G_MODULE_IMPL_WIN32)
114 #include "gmodule-win32.c"
117 #define CHECK_ERROR(rv) { g_module_set_error ("unsupported"); return rv; }
119 _g_module_open (const gchar *file_name,
125 _g_module_close (gpointer handle,
130 _g_module_self (void)
135 _g_module_symbol (gpointer handle,
136 const gchar *symbol_name)
141 _g_module_build_path (const gchar *directory,
142 const gchar *module_name)
146 #endif /* no implementation */
148 #if defined (NATIVE_WIN32) && defined (__LCC__)
150 LibMain (void *hinstDll,
151 unsigned long dwReason,
156 #endif /* NATIVE_WIN32 && __LCC__ */
159 /* --- functions --- */
161 g_module_supported (void)
169 g_module_open (const gchar *file_name,
181 handle = _g_module_self ();
184 main_module = g_new (GModule, 1);
185 main_module->file_name = NULL;
186 main_module->handle = handle;
187 main_module->ref_count = 1;
188 main_module->is_resident = TRUE;
189 main_module->unload = NULL;
190 main_module->next = NULL;
197 /* we first search the module list by name */
198 module = g_module_find_by_name (file_name);
206 /* open the module */
207 handle = _g_module_open (file_name, (flags & G_MODULE_BIND_LAZY) != 0);
211 GModuleCheckInit check_init;
212 const gchar *check_failed = NULL;
214 /* search the module list by handle, since file names are not unique */
215 module = g_module_find_by_handle (handle);
218 _g_module_close (module->handle, TRUE);
220 g_module_set_error (NULL);
225 saved_error = module_error;
227 g_module_set_error (NULL);
229 module = g_new (GModule, 1);
230 module->file_name = g_strdup (file_name);
231 module->handle = handle;
232 module->ref_count = 1;
233 module->is_resident = FALSE;
234 module->unload = NULL;
235 module->next = modules;
238 /* check initialization */
239 if (g_module_symbol (module, "g_module_check_init", (gpointer) &check_init))
240 check_failed = check_init (module);
242 /* we don't call unload() if the initialization check failed. */
244 g_module_symbol (module, "g_module_unload", (gpointer) &module->unload);
250 error = g_strconcat ("GModule initialization check failed: ", check_failed, NULL);
251 g_module_close (module);
253 g_module_set_error (error);
257 g_module_set_error (saved_error);
258 g_free (saved_error);
265 g_module_close (GModule *module)
269 g_return_val_if_fail (module != NULL, FALSE);
270 g_return_val_if_fail (module->ref_count > 0, FALSE);
274 if (!module->ref_count && !module->is_resident && module->unload)
276 GModuleUnload unload;
278 unload = module->unload;
279 module->unload = NULL;
283 if (!module->ref_count && !module->is_resident)
295 last->next = node->next;
297 modules = node->next;
305 _g_module_close (module->handle, FALSE);
306 g_free (module->file_name);
311 return module_error == NULL;
315 g_module_make_resident (GModule *module)
317 g_return_if_fail (module != NULL);
319 module->is_resident = TRUE;
323 g_module_error (void)
329 g_module_symbol (GModule *module,
330 const gchar *symbol_name,
337 g_return_val_if_fail (module != NULL, FALSE);
338 g_return_val_if_fail (symbol_name != NULL, FALSE);
339 g_return_val_if_fail (symbol != NULL, FALSE);
341 #ifdef G_MODULE_NEED_USCORE
345 name = g_strconcat ("_", symbol_name, NULL);
346 *symbol = _g_module_symbol (module->handle, name);
349 #else /* !G_MODULE_NEED_USCORE */
350 *symbol = _g_module_symbol (module->handle, symbol_name);
351 #endif /* !G_MODULE_NEED_USCORE */
357 error = g_strconcat ("`", symbol_name, "': ", module_error, NULL);
358 g_module_set_error (error);
368 g_module_name (GModule *module)
370 g_return_val_if_fail (module != NULL, NULL);
372 if (module == main_module)
375 return module->file_name;
379 g_module_build_path (const gchar *directory,
380 const gchar *module_name)
382 g_return_val_if_fail (module_name != NULL, NULL);
384 return _g_module_build_path (directory, module_name);