/[svn]/ircd-hybrid-7.2/libltdl/loaders/load_add_on.c
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Contents of /ircd-hybrid-7.2/libltdl/loaders/load_add_on.c

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Revision 945 - (show annotations)
Mon Jul 20 15:48:27 2009 UTC (10 years, 4 months ago) by michael
File MIME type: text/x-chdr
File size: 4804 byte(s)
- fixed some configure mess and imported latest libtool sources

1 /* loader-load_add_on.c -- dynamic linking for BeOS
2
3 Copyright (C) 1998, 1999, 2000, 2004, 2006,
4 2007, 2008 Free Software 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
10 GNU Libltdl is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Lesser General Public
12 License as published by the Free Software Foundation; either
13 version 2 of the License, or (at your option) any later version.
14
15 As a special exception to the GNU Lesser General Public License,
16 if you distribute this file as part of a program or library that
17 is built using GNU Libtool, you may include this file under the
18 same distribution terms that you use for the rest of that program.
19
20 GNU Libltdl is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 GNU Lesser General Public License for more details.
24
25 You should have received a copy of the GNU Lesser General Public
26 License along with GNU Libltdl; see the file COPYING.LIB. If not, a
27 copy can be downloaded from http://www.gnu.org/licenses/lgpl.html,
28 or obtained by writing to the Free Software Foundation, Inc.,
29 51 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
41 LT_BEGIN_C_DECLS
42 LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
43 LT_END_C_DECLS
44
45
46 /* Boilerplate code to set up the vtable for hooking this loader into
47 libltdl's loader list: */
48 static int vl_exit (lt_user_data loader_data);
49 static lt_module vm_open (lt_user_data loader_data, const char *filename,
50 lt_dladvise advise);
51 static int vm_close (lt_user_data loader_data, lt_module module);
52 static void * vm_sym (lt_user_data loader_data, lt_module module,
53 const char *symbolname);
54
55 static 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. */
60 lt_dlvtable *
61 get_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. */
97 static int
98 vl_exit (lt_user_data LT__UNUSED loader_data)
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. */
107 static lt_module
108 vm_open (lt_user_data LT__UNUSED loader_data, const char *filename,
109 lt_dladvise LT__UNUSED advise)
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. */
137 static int
138 vm_close (lt_user_data LT__UNUSED loader_data, 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. */
154 static void *
155 vm_sym (lt_user_data LT__UNUSED loader_data, 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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