gmodule/gmodule-beos.c

   1 /* GMODULE - GLIB wrapper code for dynamic module loading
   2  * Copyright (C) 1998, 2000 Tim Janik
   3  *
   4  * BeOS GMODULE implementation
   5  * Copyright (C) 1999 Richard Offer and Shawn T. Amundson (amundson@gtk.org)
   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
  23 /*
  24  * MT safe
  25  */
  26 #include "config.h"
  27
  28 #include <be/kernel/image.h> /* image (aka DSO) handling functions... */
  29
  30 /*
  31  * The BeOS doesn't use the same symantics as Unix's dlopen....
  32  *
  33  */
  34 #ifndef RTLD_GLOBAL
  35 #define RTLD_GLOBAL     0
  36 #endif  /* RTLD_GLOBAL */
  37 #ifndef RTLD_LAZY
  38 #define RTLD_LAZY       1
  39 #endif  /* RTLD_LAZY */
  40 #ifndef RTLD_NOW
  41 #define RTLD_NOW        0
  42 #endif  /* RTLD_NOW */
  43
  44
  45 /*
  46  * Points to Ponder
  47  *
  48  * You can load the same DSO more than once, in which case you'll have
  49  * different image_id's. While this means that we don't have to worry about
  50  * reference counts, it could lead to problems in the future....
  51  * richard.
  52  *
  53  * load_add_on() apparently does not support lazy or local binding.  Need
  54  * to confirm that the actual behavior is non-lazy/local.  --ds
  55  */
  56
  57 #include <Errors.h>
  58 #include <stdio.h>
  59
  60 /* --- functions --- */
  61 static gpointer
  62 _g_module_open (const gchar *file_name,
  63                 gboolean     bind_lazy,
  64                 gboolean     bind_local)
  65 {
  66   image_id handle;
  67
  68   handle = load_add_on (file_name);
  69   if (handle < B_OK)
  70     {
  71       gchar *msg = g_strdup_printf ("failed to load_add_on(%s): %s",
  72                                     file_name,
  73                                     strerror (handle));
  74
  75       g_module_set_error (msg);
  76       g_free (msg);
  77
  78       return NULL;
  79     }
  80
  81   return (gpointer) handle;
  82 }
  83
  84 static gpointer
  85 _g_module_self (void)
  86 {
  87   image_info info;
  88   int32 cookie = 0;
  89   status_t status;
  90
  91   /* Is it always the first one?  I'm guessing yes. */
  92   status = get_next_image_info (0, &cookie, &info);
  93   if (status == B_OK)
  94     return (gpointer) info.id;
  95   else
  96     {
  97       gchar *msg = g_strdup_printf ("failed to get_next_image_info(self): %s",
  98                                     strerror (status));
  99
 100       g_module_set_error (msg);
 101       g_free (msg);
 102
 103       return NULL;
 104     }
 105 }
 106
 107 static void
 108 _g_module_close (gpointer handle,
 109                  gboolean is_unref)
 110 {
 111   image_info info;
 112   gchar *name;
 113
 114   if (unload_add_on ((image_id) handle) != B_OK)
 115     {
 116       gchar *msg;
 117
 118       /* Try and get the name of the image. */
 119       if (get_image_info ((image_id) handle, &info) != B_OK)
 120         name = g_strdup ("unknown");
 121       else
 122         name = g_strdup (info.name);
 123
 124       msg = g_strdup_printf ("failed to unload_add_on(%s): %s", name, strerror (status));
 125       g_module_set_error (msg);
 126       g_free (msg);
 127       g_free (name);
 128     }
 129 }
 130
 131 static gpointer
 132 _g_module_symbol (gpointer     handle,
 133                   const gchar *symbol_name)
 134 {
 135   image_id id;
 136   status_t status;
 137   image_info info;
 138   int32 type, name_len;
 139   void *p;
 140   gchar *msg, name[256];
 141   gint n, l;
 142
 143   id = (image_id) handle;
 144
 145   status = get_image_info (id, &info);
 146   if (status != B_OK)
 147     {
 148       msg = g_strdup_printf ("failed to get_image_info(): %s", strerror (status));
 149       g_module_set_error (msg);
 150       g_free (msg);
 151
 152       return NULL;
 153     }
 154
 155   l = strlen (symbol_name);
 156   name_len = 256;
 157   type = B_SYMBOL_TYPE_ANY;
 158   n = 0;
 159   status = get_nth_image_symbol (id, n, name, &name_len, &type, &p);
 160   while (status == B_OK)
 161     {
 162       if (p && strncmp (name, symbol_name, l) == 0)
 163         return p;
 164
 165       if (strcmp (name, "_end") == 0)
 166         {
 167           msg = g_strdup_printf ("unmatched symbol name `%s'", symbol_name);
 168           g_module_set_error (msg);
 169           g_free (msg);
 170
 171           return NULL;
 172         }
 173
 174       name_len = 256;
 175       type = B_SYMBOL_TYPE_ANY;
 176       n++;
 177       status = get_nth_image_symbol (id, n, name, &name_len, &type, &p);
 178     }
 179
 180   msg = g_strdup_printf ("failed to get_image_symbol(%s): %s", symbol_name, strerror (status));
 181   g_module_set_error (msg);
 182   g_free (msg);
 183
 184   return NULL;
 185 }
 186
 187 static gchar*
 188 _g_module_build_path (const gchar *directory,
 189                       const gchar *module_name)
 190 {
 191   g_warning ("_g_module_build_path() untested for BeOS!");
 192
 193   if (directory && *directory)
 194     {
 195       if (strncmp (module_name, "lib", 3) == 0)
 196         return g_strconcat (directory, "/", module_name, NULL);
 197       else
 198         return g_strconcat (directory, "/lib", module_name, "." G_MODULE_SUFFIX, NULL);
 199     }
 200   else if (strncmp (module_name, "lib", 3) == 0)
 201     return g_strdup (module_name);
 202   else
 203     return g_strconcat ("lib", module_name, "." G_MODULE_SUFFIX, NULL);
 204 }