source: squid-ssl/trunk/fuentes/libltdl/loaders/load_add_on.c @ 5495

Last change on this file since 5495 was 5495, checked in by Juanma, 23 months ago

Initial release

File size: 4.7 KB
Line 
1/* loader-load_add_on.c --  dynamic linking for BeOS
2
3   Copyright (C) 1998-2000, 2004, 2006-2008, 2011-2015 Free Software
4   Foundation, Inc.
5   Written by Thomas Tanner, 1998
6
7   NOTE: The canonical source of this file is maintained with the
8   GNU Libtool package.  Report bugs to bug-libtool@gnu.org.
9
10GNU Libltdl is free software; you can redistribute it and/or
11modify it under the terms of the GNU Lesser General Public
12License as published by the Free Software Foundation; either
13version 2 of the License, or (at your option) any later version.
14
15As a special exception to the GNU Lesser General Public License,
16if you distribute this file as part of a program or library that
17is built using GNU Libtool, you may include this file under the
18same distribution terms that you use for the rest of that program.
19
20GNU Libltdl is distributed in the hope that it will be useful,
21but WITHOUT ANY WARRANTY; without even the implied warranty of
22MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23GNU Lesser General Public License for more details.
24
25You should have received a copy of the GNU Lesser General Public
26License along with GNU Libltdl; see the file COPYING.LIB.  If not, a
27copy can be downloaded from  http://www.gnu.org/licenses/lgpl.html,
28or obtained by writing to the Free Software Foundation, Inc.,
2951 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
30*/
31
32#include "lt__private.h"
33#include "lt_dlloader.h"
34
35/* Use the preprocessor to rename non-static symbols to avoid namespace
36   collisions when the loader code is statically linked into libltdl.
37   Use the "<module_name>_LTX_" prefix so that the symbol addresses can
38   be fetched from the preloaded symbol list by lt_dlsym():  */
39#define get_vtable      load_add_on_LTX_get_vtable
40
41LT_BEGIN_C_DECLS
42LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
43LT_END_C_DECLS
44
45
46/* Boilerplate code to set up the vtable for hooking this loader into
47   libltdl's loader list:  */
48static int       vl_exit  (lt_user_data loader_data);
49static lt_module vm_open  (lt_user_data loader_data, const char *filename,
50                           lt_dladvise advise);
51static int       vm_close (lt_user_data loader_data, lt_module module);
52static void *    vm_sym   (lt_user_data loader_data, lt_module module,
53                          const char *symbolname);
54
55static lt_dlvtable *vtable = 0;
56
57/* Return the vtable for this loader, only the name and sym_prefix
58   attributes (plus the virtual function implementations, obviously)
59   change between loaders.  */
60lt_dlvtable *
61get_vtable (lt_user_data loader_data)
62{
63  if (!vtable)
64    {
65      vtable = lt__zalloc (sizeof *vtable);
66    }
67
68  if (vtable && !vtable->name)
69    {
70      vtable->name              = "lt_load_add_on";
71      vtable->module_open       = vm_open;
72      vtable->module_close      = vm_close;
73      vtable->find_sym          = vm_sym;
74      vtable->dlloader_exit     = vl_exit;
75      vtable->dlloader_data     = loader_data;
76      vtable->priority          = LT_DLLOADER_APPEND;
77    }
78
79  if (vtable && (vtable->dlloader_data != loader_data))
80    {
81      LT__SETERROR (INIT_LOADER);
82      return 0;
83    }
84
85  return vtable;
86}
87
88
89
90/* --- IMPLEMENTATION --- */
91
92
93#include <kernel/image.h>
94
95/* A function called through the vtable when this loader is no
96   longer needed by the application.  */
97static int
98vl_exit (lt_user_data loader_data LT__UNUSED)
99{
100  vtable = NULL;
101  return 0;
102}
103
104/* A function called through the vtable to open a module with this
105   loader.  Returns an opaque representation of the newly opened
106   module for processing with this loader's other vtable functions.  */
107static lt_module
108vm_open (lt_user_data loader_data LT__UNUSED, const char *filename,
109         lt_dladvise advise LT__UNUSED)
110{
111  image_id image = 0;
112
113  if (filename)
114    {
115      image = load_add_on (filename);
116    }
117  else
118    {
119      image_info info;
120      int32 cookie = 0;
121      if (get_next_image_info (0, &cookie, &info) == B_OK)
122        image = load_add_on (info.name);
123    }
124
125  if (image <= 0)
126    {
127      LT__SETERROR (CANNOT_OPEN);
128      image = 0;
129    }
130
131  return (lt_module) image;
132}
133
134
135/* A function called through the vtable when a particular module
136   should be unloaded.  */
137static int
138vm_close (lt_user_data loader_data LT__UNUSED, lt_module module)
139{
140  int errors = 0;
141
142  if (unload_add_on ((image_id) module) != B_OK)
143    {
144      LT__SETERROR (CANNOT_CLOSE);
145      ++errors;
146    }
147
148  return errors;
149}
150
151
152/* A function called through the vtable to get the address of
153   a symbol loaded from a particular module.  */
154static void *
155vm_sym (lt_user_data loader_data LT__UNUSED, lt_module module, const char *name)
156{
157  void *address = 0;
158  image_id image = (image_id) module;
159
160  if (get_image_symbol (image, name, B_SYMBOL_TYPE_ANY, address) != B_OK)
161    {
162      LT__SETERROR (SYMBOL_NOT_FOUND);
163      address = 0;
164    }
165
166  return address;
167}
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