glib/libgmodule/src/gmodule.c
changeset 0 e4d67989cc36
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-1:000000000000 0:e4d67989cc36
       
     1 /* GMODULE - GLIB wrapper code for dynamic module loading
       
     2  * Copyright (C) 1998 Tim Janik
       
     3  * Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
       
     4  *
       
     5  * This library is free software; you can redistribute it and/or
       
     6  * modify it under the terms of the GNU Lesser General Public
       
     7  * License as published by the Free Software Foundation; either
       
     8  * version 2 of the License, or (at your option) any later version.
       
     9  *
       
    10  * This library is distributed in the hope that it will be useful,
       
    11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
       
    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
       
    13  * Lesser General Public License for more details.
       
    14  *
       
    15  * You should have received a copy of the GNU Lesser General Public
       
    16  * License along with this library; if not, write to the
       
    17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
       
    18  * Boston, MA 02111-1307, USA.
       
    19  */
       
    20 
       
    21 /*
       
    22  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
       
    23  * file for a list of people on the GLib Team.  See the ChangeLog
       
    24  * files for a list of changes.  These files are distributed with
       
    25  * GLib at ftp://ftp.gtk.org/pub/gtk/. 
       
    26  */
       
    27 
       
    28 /* 
       
    29  * MT safe
       
    30  */
       
    31 
       
    32 #ifdef HAVE_CONFIG_H
       
    33 # include <config.h>
       
    34 #endif
       
    35 #include	"gstdio.h"
       
    36 #include	"gmodule.h"
       
    37 #include	"gmoduleconf.h"
       
    38 #include	<errno.h>
       
    39 #include	<string.h>
       
    40 #include 	<sys/types.h>
       
    41 #include 	<sys/stat.h>
       
    42 #include 	<fcntl.h>
       
    43 #ifdef HAVE_UNISTD_H
       
    44 # include <unistd.h>
       
    45 #endif
       
    46 #if defined (G_OS_WIN32)
       
    47 # include <io.h>		/* For open() and close() prototypes. */
       
    48 #endif
       
    49 
       
    50 #ifdef __SYMBIAN32__
       
    51 #include <gmodule_wsd.h>
       
    52 #endif /* __SYMBIAN32__ */
       
    53 
       
    54 /* We maintain a list of modules, so we can reference count them.
       
    55  * That's needed because some platforms don't support refernce counts on
       
    56  * modules e.g. the shl_* implementation of HP-UX
       
    57  * (http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html).
       
    58  * Also, the module for the program itself is kept seperatedly for
       
    59  * faster access and because it has special semantics.
       
    60  */
       
    61 
       
    62 
       
    63 /* --- structures --- */
       
    64 struct _GModule
       
    65 {
       
    66   gchar	*file_name;
       
    67 #ifdef G_OS_WIN32
       
    68   gchar *cp_file_name;
       
    69 #endif
       
    70   gpointer handle;
       
    71   guint ref_count : 31;
       
    72   guint is_resident : 1;
       
    73   GModuleUnload unload;
       
    74   GModule *next;
       
    75 };
       
    76 
       
    77 
       
    78 /* --- prototypes --- */
       
    79 static gpointer		_g_module_open		(const gchar	*file_name,
       
    80 						 gboolean	 bind_lazy,
       
    81 						 gboolean	 bind_local);
       
    82 static void		_g_module_close		(gpointer	 handle,
       
    83 						 gboolean	 is_unref);
       
    84 static gpointer		_g_module_self		(void);
       
    85 static gpointer		_g_module_symbol	(gpointer	 handle,
       
    86 						 const gchar	*symbol_name);
       
    87 static gchar*		_g_module_build_path	(const gchar	*directory,
       
    88 						 const gchar	*module_name);
       
    89 static inline void	g_module_set_error	(const gchar	*error);
       
    90 static inline GModule*	g_module_find_by_handle (gpointer	 handle);
       
    91 static inline GModule*	g_module_find_by_name	(const gchar	*name);
       
    92 
       
    93 
       
    94 /* --- variables --- */
       
    95 #if EMULATOR
       
    96 
       
    97 PLS(modules,gmodule,GModule *)
       
    98 PLS(main_module,gmodule,GModule *)
       
    99 PLS(module_error_private,gmodule,GStaticPrivate)
       
   100 
       
   101 #define modules (*FUNCTION_NAME(modules,gmodule)())
       
   102 #define main_module (*FUNCTION_NAME(main_module,gmodule)())
       
   103 #define module_error_private (*FUNCTION_NAME(module_error_private,gmodule)())
       
   104 
       
   105 #else
       
   106 static GModule	     *modules = NULL;
       
   107 static GModule	     *main_module = NULL;
       
   108 static GStaticPrivate module_error_private = G_STATIC_PRIVATE_INIT;
       
   109 #endif /* EMULATOR */
       
   110 
       
   111 
       
   112 /* --- inline functions --- */
       
   113 static inline GModule*
       
   114 g_module_find_by_handle (gpointer handle)
       
   115 {
       
   116   GModule *module;
       
   117   GModule *retval = NULL;
       
   118   
       
   119   if (main_module && main_module->handle == handle)
       
   120     retval = main_module;
       
   121   else
       
   122     for (module = modules; module; module = module->next)
       
   123       if (handle == module->handle)
       
   124 	{
       
   125 	  retval = module;
       
   126 	  break;
       
   127 	}
       
   128 
       
   129   return retval;
       
   130 }
       
   131 
       
   132 static inline GModule*
       
   133 g_module_find_by_name (const gchar *name)
       
   134 {
       
   135   GModule *module;
       
   136   GModule *retval = NULL;
       
   137   
       
   138   for (module = modules; module; module = module->next)
       
   139     if (strcmp (name, module->file_name) == 0)
       
   140 	{
       
   141 	  retval = module;
       
   142 	  break;
       
   143 	}
       
   144 
       
   145   return retval;
       
   146 }
       
   147 
       
   148 static inline void
       
   149 g_module_set_error_unduped (gchar *error)
       
   150 {
       
   151   g_static_private_set (&module_error_private, error, g_free);
       
   152   errno = 0;
       
   153 }
       
   154 
       
   155 static inline void
       
   156 g_module_set_error (const gchar *error)
       
   157 {
       
   158   g_module_set_error_unduped (g_strdup (error));
       
   159 }
       
   160 
       
   161 
       
   162 /* --- include platform specifc code --- */
       
   163 #define	SUPPORT_OR_RETURN(rv)	{ g_module_set_error (NULL); }
       
   164 #if	(G_MODULE_IMPL == G_MODULE_IMPL_DL)
       
   165 #include "gmodule-dl.c"
       
   166 #elif	(G_MODULE_IMPL == G_MODULE_IMPL_DLD)
       
   167 #include "gmodule-dld.c"
       
   168 #elif	(G_MODULE_IMPL == G_MODULE_IMPL_WIN32)
       
   169 #include "gmodule-win32.c"
       
   170 #elif	(G_MODULE_IMPL == G_MODULE_IMPL_DYLD)
       
   171 #include "gmodule-dyld.c"
       
   172 #elif	(G_MODULE_IMPL == G_MODULE_IMPL_AR)
       
   173 #include "gmodule-ar.c"
       
   174 #else
       
   175 #undef	SUPPORT_OR_RETURN
       
   176 #define	SUPPORT_OR_RETURN(rv)	{ g_module_set_error ("dynamic modules are " \
       
   177                                               "not supported by this system"); return rv; }
       
   178 static gpointer
       
   179 _g_module_open (const gchar	*file_name,
       
   180 		gboolean	 bind_lazy,
       
   181 		gboolean	 bind_local)
       
   182 {
       
   183   return NULL;
       
   184 }
       
   185 static void
       
   186 _g_module_close	(gpointer	 handle,
       
   187 		 gboolean	 is_unref)
       
   188 {
       
   189 }
       
   190 static gpointer
       
   191 _g_module_self (void)
       
   192 {
       
   193   return NULL;
       
   194 }
       
   195 static gpointer
       
   196 _g_module_symbol (gpointer	 handle,
       
   197 		  const gchar	*symbol_name)
       
   198 {
       
   199   return NULL;
       
   200 }
       
   201 static gchar*
       
   202 _g_module_build_path (const gchar *directory,
       
   203 		      const gchar *module_name)
       
   204 {
       
   205   return NULL;
       
   206 }
       
   207 #endif	/* no implementation */
       
   208 
       
   209 /* --- functions --- */
       
   210 EXPORT_C gboolean
       
   211 g_module_supported (void)
       
   212 {
       
   213   SUPPORT_OR_RETURN (FALSE);
       
   214   
       
   215   return TRUE;
       
   216 }
       
   217 
       
   218 static gchar*
       
   219 parse_libtool_archive (const gchar* libtool_name)
       
   220 {
       
   221   const guint TOKEN_DLNAME = G_TOKEN_LAST + 1;
       
   222   const guint TOKEN_INSTALLED = G_TOKEN_LAST + 2;
       
   223   const guint TOKEN_LIBDIR = G_TOKEN_LAST + 3;
       
   224   gchar *lt_dlname = NULL;
       
   225   gboolean lt_installed = TRUE;
       
   226   gchar *lt_libdir = NULL;
       
   227   gchar *name;
       
   228   GTokenType token;
       
   229   GScanner *scanner;
       
   230   
       
   231   int fd = g_open (libtool_name, O_RDONLY, 0);
       
   232   if (fd < 0)
       
   233     {
       
   234       gchar *display_libtool_name = g_filename_display_name (libtool_name);
       
   235       g_module_set_error_unduped (g_strdup_printf ("failed to open libtool archive \"%s\"", display_libtool_name));
       
   236       g_free (display_libtool_name);
       
   237       return NULL;
       
   238     }
       
   239   /* search libtool's dlname specification  */
       
   240   scanner = g_scanner_new (NULL);
       
   241   g_scanner_input_file (scanner, fd);
       
   242   scanner->config->symbol_2_token = TRUE;
       
   243   g_scanner_scope_add_symbol (scanner, 0, "dlname", 
       
   244 			      GUINT_TO_POINTER (TOKEN_DLNAME));
       
   245   g_scanner_scope_add_symbol (scanner, 0, "installed", 
       
   246 			      GUINT_TO_POINTER (TOKEN_INSTALLED));
       
   247   g_scanner_scope_add_symbol (scanner, 0, "libdir", 
       
   248 			      GUINT_TO_POINTER (TOKEN_LIBDIR));
       
   249   while (!g_scanner_eof (scanner))
       
   250     {
       
   251       token = g_scanner_get_next_token (scanner);
       
   252       if (token == TOKEN_DLNAME || token == TOKEN_INSTALLED || 
       
   253 	  token == TOKEN_LIBDIR)
       
   254 	{
       
   255 	  if (g_scanner_get_next_token (scanner) != '=' ||
       
   256 	      g_scanner_get_next_token (scanner) != 
       
   257 	      (token == TOKEN_INSTALLED ? 
       
   258 	       G_TOKEN_IDENTIFIER : G_TOKEN_STRING))
       
   259 	    {
       
   260 	      gchar *display_libtool_name = g_filename_display_name (libtool_name);
       
   261 	      g_module_set_error_unduped (g_strdup_printf ("unable to parse libtool archive \"%s\"", display_libtool_name));
       
   262 	      g_free (display_libtool_name);
       
   263 
       
   264 	      g_free (lt_dlname);
       
   265 	      g_free (lt_libdir);
       
   266 	      g_scanner_destroy (scanner);
       
   267 	      close (fd);
       
   268 
       
   269 	      return NULL;
       
   270 	    }
       
   271 	  else
       
   272 	    {
       
   273 	      if (token == TOKEN_DLNAME)
       
   274 		{
       
   275 		  g_free (lt_dlname);
       
   276 		  lt_dlname = g_strdup (scanner->value.v_string);
       
   277 		}
       
   278 	      else if (token == TOKEN_INSTALLED)
       
   279 		lt_installed = 
       
   280 		  strcmp (scanner->value.v_identifier, "yes") == 0;
       
   281 	      else /* token == TOKEN_LIBDIR */
       
   282 		{
       
   283 		  g_free (lt_libdir);
       
   284 		  lt_libdir = g_strdup (scanner->value.v_string);
       
   285 		}
       
   286 	    }
       
   287 	}      
       
   288     }
       
   289 
       
   290   if (!lt_installed)
       
   291     {
       
   292       gchar *dir = g_path_get_dirname (libtool_name);
       
   293       g_free (lt_libdir);
       
   294       lt_libdir = g_strconcat (dir, G_DIR_SEPARATOR_S ".libs", NULL);
       
   295       g_free (dir);
       
   296     }
       
   297 
       
   298   name = g_strconcat (lt_libdir, G_DIR_SEPARATOR_S, lt_dlname, NULL);
       
   299   
       
   300   g_free (lt_dlname);
       
   301   g_free (lt_libdir);
       
   302   g_scanner_destroy (scanner);
       
   303   close (fd);
       
   304 
       
   305   return name;
       
   306 }
       
   307 
       
   308 static inline gboolean
       
   309 str_check_suffix (const gchar* string,
       
   310 		  const gchar* suffix)
       
   311 {
       
   312   gsize string_len = strlen (string);    
       
   313   gsize suffix_len = strlen (suffix);    
       
   314 
       
   315   return string_len >= suffix_len && 
       
   316     strcmp (string + string_len - suffix_len, suffix) == 0;
       
   317 }
       
   318 
       
   319 #if EMULATOR
       
   320 
       
   321 PLS(g_module_global_lock,gmodule,GStaticRecMutex)
       
   322 #define g_module_global_lock (*FUNCTION_NAME(g_module_global_lock,gmodule)())
       
   323 
       
   324 #else
       
   325 
       
   326 static GStaticRecMutex g_module_global_lock = G_STATIC_REC_MUTEX_INIT;
       
   327 
       
   328 #endif /* EMULATOR */
       
   329 
       
   330 EXPORT_C GModule*
       
   331 g_module_open (const gchar    *file_name,
       
   332 	       GModuleFlags    flags)
       
   333 {
       
   334   GModule *module;
       
   335   gpointer handle = NULL;
       
   336   gchar *name = NULL;
       
   337   
       
   338   SUPPORT_OR_RETURN (NULL);
       
   339   
       
   340   g_static_rec_mutex_lock (&g_module_global_lock);
       
   341   if (!file_name)
       
   342     {      
       
   343       if (!main_module)
       
   344 	{
       
   345 	  handle = _g_module_self ();
       
   346 	  if (handle)
       
   347 	    {
       
   348 	      main_module = g_new (GModule, 1);
       
   349 	      main_module->file_name = NULL;
       
   350 #ifdef G_OS_WIN32
       
   351 	      main_module->cp_file_name = NULL;
       
   352 #endif
       
   353 	      main_module->handle = handle;
       
   354 	      main_module->ref_count = 1;
       
   355 	      main_module->is_resident = TRUE;
       
   356 	      main_module->unload = NULL;
       
   357 	      main_module->next = NULL;
       
   358 	    }
       
   359 	}
       
   360       else
       
   361 	main_module->ref_count++;
       
   362 
       
   363       g_static_rec_mutex_unlock (&g_module_global_lock);
       
   364       return main_module;
       
   365     }
       
   366   
       
   367   /* we first search the module list by name */
       
   368   module = g_module_find_by_name (file_name);
       
   369   if (module)
       
   370     {
       
   371       module->ref_count++;
       
   372       
       
   373       g_static_rec_mutex_unlock (&g_module_global_lock);
       
   374       return module;
       
   375     }
       
   376 
       
   377   /* check whether we have a readable file right away */
       
   378   if (g_file_test (file_name, G_FILE_TEST_IS_REGULAR))
       
   379     name = g_strdup (file_name);
       
   380   /* try completing file name with standard library suffix */
       
   381   if (!name)
       
   382     {
       
   383       name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
       
   384       if (!g_file_test (name, G_FILE_TEST_IS_REGULAR))
       
   385 	{
       
   386 	  g_free (name);
       
   387 	  name = NULL;
       
   388 	}
       
   389     }
       
   390   /* try completing by appending libtool suffix */
       
   391   if (!name)
       
   392     {
       
   393       name = g_strconcat (file_name, ".la", NULL);
       
   394       if (!g_file_test (name, G_FILE_TEST_IS_REGULAR))
       
   395 	{
       
   396 	  g_free (name);
       
   397 	  name = NULL;
       
   398 	}
       
   399     }
       
   400   /* we can't access() the file, lets hope the platform backends finds
       
   401    * it via library paths
       
   402    */
       
   403   if (!name)
       
   404     {
       
   405       gchar *dot = strrchr (file_name, '.');
       
   406       gchar *slash = strrchr (file_name, G_DIR_SEPARATOR);
       
   407       
       
   408       /* make sure the name has a suffix */
       
   409       if (!dot || dot < slash)
       
   410 	name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
       
   411       else
       
   412 	name = g_strdup (file_name);
       
   413     }
       
   414 
       
   415   /* ok, try loading the module */
       
   416   if (name)
       
   417     {
       
   418       /* if it's a libtool archive, figure library file to load */
       
   419       if (str_check_suffix (name, ".la")) /* libtool archive? */
       
   420 	{
       
   421 	  gchar *real_name = parse_libtool_archive (name);
       
   422 
       
   423 	  /* real_name might be NULL, but then module error is already set */
       
   424 	  g_free (name);
       
   425 	  name = real_name;
       
   426 	}
       
   427       if (name)
       
   428 	handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0,
       
   429 			(flags & G_MODULE_BIND_LOCAL) != 0);
       
   430     }
       
   431   else
       
   432     {
       
   433       gchar *display_file_name = g_filename_display_name (file_name);
       
   434       g_module_set_error_unduped (g_strdup_printf ("unable to access file \"%s\"", display_file_name));
       
   435       g_free (display_file_name);
       
   436     }
       
   437   g_free (name);
       
   438 
       
   439   if (handle)
       
   440     {
       
   441       gchar *saved_error;
       
   442       GModuleCheckInit check_init;
       
   443       const gchar *check_failed = NULL;
       
   444       
       
   445       /* search the module list by handle, since file names are not unique */
       
   446       module = g_module_find_by_handle (handle);
       
   447       if (module)
       
   448 	{
       
   449 	  _g_module_close (module->handle, TRUE);
       
   450 	  module->ref_count++;
       
   451 	  g_module_set_error (NULL);
       
   452 	  
       
   453 	  g_static_rec_mutex_unlock (&g_module_global_lock);
       
   454 	  return module;
       
   455 	}
       
   456       
       
   457       saved_error = g_strdup (g_module_error ());
       
   458       g_module_set_error (NULL);
       
   459       module = g_new (GModule, 1);
       
   460       module->file_name = g_strdup (file_name);
       
   461 #ifdef G_OS_WIN32
       
   462       module->cp_file_name = g_locale_from_utf8 (file_name, -1,
       
   463 						 NULL, NULL, NULL);
       
   464 #endif
       
   465       module->handle = handle;
       
   466       module->ref_count = 1;
       
   467       module->is_resident = FALSE;
       
   468       module->unload = NULL;
       
   469       module->next = modules;
       
   470       modules = module;
       
   471       
       
   472       /* check initialization */
       
   473       if (g_module_symbol (module, "g_module_check_init", (gpointer) &check_init))
       
   474 	check_failed = check_init (module);
       
   475       
       
   476       /* we don't call unload() if the initialization check failed. */
       
   477       if (!check_failed)
       
   478 	g_module_symbol (module, "g_module_unload", (gpointer) &module->unload);
       
   479       
       
   480       if (check_failed)
       
   481 	{
       
   482 	  gchar *error;
       
   483 
       
   484 	  error = g_strconcat ("GModule initialization check failed: ", check_failed, NULL);
       
   485 	  g_module_close (module);
       
   486 	  module = NULL;
       
   487 	  g_module_set_error (error);
       
   488 	  g_free (error);
       
   489 	}
       
   490       else
       
   491 	g_module_set_error (saved_error);
       
   492 
       
   493       g_free (saved_error);
       
   494     }
       
   495 
       
   496   g_static_rec_mutex_unlock (&g_module_global_lock);
       
   497   return module;
       
   498 }
       
   499 
       
   500 #ifdef G_OS_WIN32
       
   501 
       
   502 #undef g_module_open
       
   503 
       
   504 GModule*
       
   505 g_module_open (const gchar    *file_name,
       
   506 	       GModuleFlags    flags)
       
   507 {
       
   508   gchar *utf8_file_name = g_locale_to_utf8 (file_name, -1, NULL, NULL, NULL);
       
   509   GModule *retval = g_module_open_utf8 (utf8_file_name, flags);
       
   510 
       
   511   g_free (utf8_file_name);
       
   512 
       
   513   return retval;
       
   514 }
       
   515 
       
   516 #endif
       
   517 
       
   518 EXPORT_C gboolean
       
   519 g_module_close (GModule	       *module)
       
   520 {
       
   521   SUPPORT_OR_RETURN (FALSE);
       
   522   
       
   523   g_return_val_if_fail (module != NULL, FALSE);
       
   524   g_return_val_if_fail (module->ref_count > 0, FALSE);
       
   525   
       
   526   g_static_rec_mutex_lock (&g_module_global_lock);
       
   527 
       
   528   module->ref_count--;
       
   529   
       
   530   if (!module->ref_count && !module->is_resident && module->unload)
       
   531     {
       
   532       GModuleUnload unload;
       
   533 
       
   534       unload = module->unload;
       
   535       module->unload = NULL;
       
   536       unload (module);
       
   537     }
       
   538 
       
   539   if (!module->ref_count && !module->is_resident)
       
   540     {
       
   541       GModule *last;
       
   542       GModule *node;
       
   543       
       
   544       last = NULL;
       
   545       
       
   546       node = modules;
       
   547       while (node)
       
   548 	{
       
   549 	  if (node == module)
       
   550 	    {
       
   551 	      if (last)
       
   552 		last->next = node->next;
       
   553 	      else
       
   554 		modules = node->next;
       
   555 	      break;
       
   556 	    }
       
   557 	  last = node;
       
   558 	  node = last->next;
       
   559 	}
       
   560       module->next = NULL;
       
   561       
       
   562       _g_module_close (module->handle, FALSE);
       
   563       g_free (module->file_name);
       
   564 #ifdef G_OS_WIN32
       
   565       g_free (module->cp_file_name);
       
   566 #endif
       
   567       g_free (module);
       
   568     }
       
   569   
       
   570   g_static_rec_mutex_unlock (&g_module_global_lock);
       
   571   return g_module_error() == NULL;
       
   572 }
       
   573 
       
   574 EXPORT_C void
       
   575 g_module_make_resident (GModule *module)
       
   576 {
       
   577   g_return_if_fail (module != NULL);
       
   578 
       
   579   module->is_resident = TRUE;
       
   580 }
       
   581 
       
   582 EXPORT_C G_CONST_RETURN gchar*
       
   583 g_module_error (void)
       
   584 {
       
   585   return g_static_private_get (&module_error_private);
       
   586 }
       
   587 
       
   588 EXPORT_C gboolean
       
   589 g_module_symbol (GModule	*module,
       
   590 		 const gchar	*symbol_name,
       
   591 		 gpointer	*symbol)
       
   592 {
       
   593   const gchar *module_error;
       
   594 
       
   595   if (symbol)
       
   596     *symbol = NULL;
       
   597   SUPPORT_OR_RETURN (FALSE);
       
   598   
       
   599   g_return_val_if_fail (module != NULL, FALSE);
       
   600   g_return_val_if_fail (symbol_name != NULL, FALSE);
       
   601   g_return_val_if_fail (symbol != NULL, FALSE);
       
   602   
       
   603   g_static_rec_mutex_lock (&g_module_global_lock);
       
   604 
       
   605 #ifdef	G_MODULE_NEED_USCORE
       
   606   {
       
   607     gchar *name;
       
   608 
       
   609     name = g_strconcat ("_", symbol_name, NULL);
       
   610     *symbol = _g_module_symbol (module->handle, name);
       
   611     g_free (name);
       
   612   }
       
   613 #else	/* !G_MODULE_NEED_USCORE */
       
   614   *symbol = _g_module_symbol (module->handle, symbol_name);
       
   615 #endif	/* !G_MODULE_NEED_USCORE */
       
   616   
       
   617   module_error = g_module_error ();
       
   618   if (module_error)
       
   619     {
       
   620       gchar *error;
       
   621 
       
   622       error = g_strconcat ("`", symbol_name, "': ", module_error, NULL);
       
   623       g_module_set_error (error);
       
   624       g_free (error);
       
   625       *symbol = NULL;
       
   626     }
       
   627   
       
   628   g_static_rec_mutex_unlock (&g_module_global_lock);
       
   629   return *symbol != NULL;
       
   630 }
       
   631 
       
   632 EXPORT_C G_CONST_RETURN gchar*
       
   633 g_module_name (GModule *module)
       
   634 {
       
   635   g_return_val_if_fail (module != NULL, NULL);
       
   636   
       
   637   if (module == main_module)
       
   638     return "main";
       
   639   
       
   640   return module->file_name;
       
   641 }
       
   642 
       
   643 #ifdef G_OS_WIN32
       
   644 
       
   645 #undef g_module_name
       
   646 
       
   647 G_CONST_RETURN gchar*
       
   648 g_module_name (GModule *module)
       
   649 {
       
   650   g_return_val_if_fail (module != NULL, NULL);
       
   651   
       
   652   if (module == main_module)
       
   653     return "main";
       
   654   
       
   655   return module->cp_file_name;
       
   656 }
       
   657 
       
   658 #endif
       
   659 
       
   660 EXPORT_C gchar*
       
   661 g_module_build_path (const gchar *directory,
       
   662 		     const gchar *module_name)
       
   663 {
       
   664   g_return_val_if_fail (module_name != NULL, NULL);
       
   665   
       
   666   return _g_module_build_path (directory, module_name);
       
   667 }