gmodule/gmodule-dyld.c

   1 /* GMODULE - GLIB wrapper code for dynamic module loading
   2  * Copyright (C) 1998, 2000 Tim Janik
   3  *
   4  * dyld (Darwin) GMODULE implementation
   5  * Copyright (C) 2001 Dan Winship
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22 #include "config.h"
  23
  24 #include <mach-o/dyld.h>
  25
  26 static gpointer self_module = GINT_TO_POINTER (1);
  27
  28 static gpointer
  29 _g_module_open (const gchar *file_name,
  30                 gboolean     bind_lazy,
  31                 gboolean     bind_local)
  32 {
  33   NSObjectFileImage image;
  34   NSObjectFileImageReturnCode ret;
  35   NSModule module;
  36   unsigned long options;
  37   char *msg;
  38
  39   ret = NSCreateObjectFileImageFromFile (file_name, &image);
  40   if (ret != NSObjectFileImageSuccess)
  41     {
  42       switch (ret)
  43         {
  44         case NSObjectFileImageInappropriateFile:
  45         case NSObjectFileImageFormat:
  46           msg = g_strdup_printf ("%s is not a loadable module", file_name);
  47           break;
  48
  49         case NSObjectFileImageArch:
  50           msg = g_strdup_printf ("%s is not built for this architecture",
  51                                  file_name);
  52           break;
  53
  54         case NSObjectFileImageAccess:
  55           if (access (file_name, F_OK) == 0)
  56             msg = g_strdup_printf ("%s: permission denied", file_name);
  57           else
  58             msg = g_strdup_printf ("%s: no such file or directory", file_name);
  59           break;
  60
  61         default:
  62           msg = g_strdup_printf ("unknown error for %s", file_name);
  63           break;
  64         }
  65
  66       g_module_set_error (msg);
  67       g_free (msg);
  68       return NULL;
  69     }
  70
  71   options = NSLINKMODULE_OPTION_RETURN_ON_ERROR;
  72   if (bind_local)
  73     options |= NSLINKMODULE_OPTION_PRIVATE;
  74   if (!bind_lazy)
  75     options |= NSLINKMODULE_OPTION_BINDNOW;
  76   module = NSLinkModule (image, file_name, options);
  77   NSDestroyObjectFileImage (image);
  78   if (!module)
  79     {
  80       NSLinkEditErrors c;
  81       int error_number;
  82       const char *file, *error;
  83
  84       NSLinkEditError (&c, &error_number, &file, &error);
  85       msg = g_strdup_printf ("could not link %s: %s", file_name, error);
  86       g_module_set_error (msg);
  87       g_free (msg);
  88       return NULL;
  89     }
  90
  91   return module;
  92 }
  93
  94 static gpointer
  95 _g_module_self (void)
  96 {
  97   return &self_module;
  98 }
  99
 100 static void
 101 _g_module_close (gpointer handle,
 102                  gboolean is_unref)
 103 {
 104   if (handle == &self_module)
 105     return;
 106
 107   if (!NSUnLinkModule (handle, 0))
 108     g_module_set_error ("could not unlink module");
 109 }
 110
 111 static gpointer
 112 _g_module_symbol (gpointer     handle,
 113                   const gchar *symbol_name)
 114 {
 115   NSSymbol sym;
 116   char *msg;
 117
 118   if (handle == &self_module)
 119     {
 120       if (NSIsSymbolNameDefined (symbol_name))
 121         sym = NSLookupAndBindSymbol (symbol_name);
 122       else
 123         sym = NULL;
 124     }
 125   else
 126     sym = NSLookupSymbolInModule (handle, symbol_name);
 127
 128   if (!sym)
 129     {
 130       msg = g_strdup_printf ("no such symbol %s", symbol_name);
 131       g_module_set_error (msg);
 132       g_free (msg);
 133       return NULL;
 134     }
 135
 136   return NSAddressOfSymbol (sym);
 137 }
 138
 139 static gchar*
 140 _g_module_build_path (const gchar *directory,
 141                       const gchar *module_name)
 142 {
 143   if (directory && *directory)
 144     {
 145       if (strncmp (module_name, "lib", 3) == 0)
 146         return g_strconcat (directory, "/", module_name, NULL);
 147       else
 148         return g_strconcat (directory, "/lib", module_name, "." G_MODULE_SUFFIX, NULL);
 149     }
 150   else if (strncmp (module_name, "lib", 3) == 0)
 151     return g_strdup (module_name);
 152   else
 153     return g_strconcat ("lib", module_name, "." G_MODULE_SUFFIX, NULL);
 154 }