libltdl/loaders/load_add_on.c

/* loader-load_add_on.c --  dynamic linking for BeOS

   Copyright (C) 1998-2000, 2004, 2006-2008, 2011-2015 Free Software
   Foundation, Inc.
   Written by Thomas Tanner, 1998

   NOTE: The canonical source of this file is maintained with the
   GNU Libtool package.  Report bugs to bug-libtool@gnu.org.

GNU Libltdl is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

As a special exception to the GNU Lesser General Public License,
if you distribute this file as part of a program or library that
is built using GNU Libtool, you may include this file under the
same distribution terms that you use for the rest of that program.

GNU Libltdl is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with GNU Libltdl; see the file COPYING.LIB.  If not, a
copy can be downloaded from  http://www.gnu.org/licenses/lgpl.html,
or obtained by writing to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/

#include "lt__private.h"
#include "lt_dlloader.h"

/* Use the preprocessor to rename non-static symbols to avoid namespace
   collisions when the loader code is statically linked into libltdl.
   Use the "<module_name>_LTX_" prefix so that the symbol addresses can
   be fetched from the preloaded symbol list by lt_dlsym():  */
#define get_vtable      load_add_on_LTX_get_vtable

LT_BEGIN_C_DECLS
LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
LT_END_C_DECLS


/* Boilerplate code to set up the vtable for hooking this loader into
   libltdl's loader list:  */
static int       vl_exit  (lt_user_data loader_data);
static lt_module vm_open  (lt_user_data loader_data, const char *filename,
                           lt_dladvise advise);
static int       vm_close (lt_user_data loader_data, lt_module module);
static void *    vm_sym   (lt_user_data loader_data, lt_module module,
                          const char *symbolname);

static lt_dlvtable *vtable = 0;

/* Return the vtable for this loader, only the name and sym_prefix
   attributes (plus the virtual function implementations, obviously)
   change between loaders.  */
lt_dlvtable *
get_vtable (lt_user_data loader_data)
{
  if (!vtable)
    {
      vtable = lt__zalloc (sizeof *vtable);
    }

  if (vtable && !vtable->name)
    {
      vtable->name              = "lt_load_add_on";
      vtable->module_open       = vm_open;
      vtable->module_close      = vm_close;
      vtable->find_sym          = vm_sym;
      vtable->dlloader_exit     = vl_exit;
      vtable->dlloader_data     = loader_data;
      vtable->priority          = LT_DLLOADER_APPEND;
    }

  if (vtable && (vtable->dlloader_data != loader_data))
    {
      LT__SETERROR (INIT_LOADER);
      return 0;
    }

  return vtable;
}


/* --- IMPLEMENTATION --- */


#include <kernel/image.h>

/* A function called through the vtable when this loader is no
   longer needed by the application.  */
static int
vl_exit (lt_user_data loader_data LT__UNUSED)
{
  vtable = NULL;
  return 0;
}

/* A function called through the vtable to open a module with this
   loader.  Returns an opaque representation of the newly opened
   module for processing with this loader's other vtable functions.  */
static lt_module
vm_open (lt_user_data loader_data LT__UNUSED, const char *filename,
         lt_dladvise advise LT__UNUSED)
{
  image_id image = 0;

  if (filename)
    {
      image = load_add_on (filename);
    }
  else
    {
      image_info info;
      int32 cookie = 0;
      if (get_next_image_info (0, &cookie, &info) == B_OK)
        image = load_add_on (info.name);
    }

  if (image <= 0)
    {
      LT__SETERROR (CANNOT_OPEN);
      image = 0;
    }

  return (lt_module) image;
}


/* A function called through the vtable when a particular module
   should be unloaded.  */
static int
vm_close (lt_user_data loader_data LT__UNUSED, lt_module module)
{
  int errors = 0;

  if (unload_add_on ((image_id) module) != B_OK)
    {
      LT__SETERROR (CANNOT_CLOSE);
      ++errors;
    }

  return errors;
}


/* A function called through the vtable to get the address of
   a symbol loaded from a particular module.  */
static void *
vm_sym (lt_user_data loader_data LT__UNUSED, lt_module module, const char *name)
{
  void *address = 0;
  image_id image = (image_id) module;

  if (get_image_symbol (image, name, B_SYMBOL_TYPE_ANY, address) != B_OK)
    {
      LT__SETERROR (SYMBOL_NOT_FOUND);
      address = 0;
    }

  return address;
}
Revision:	5395
Committed:	Tue Jan 20 14:03:27 2015 UTC (9 years, 2 months ago) by michael
Content type:	text/x-csrc
File size:	4787 byte(s)
Log Message:	- libtool 2.4.5, automake 1.15
#	Content
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
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 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. */
107	static lt_module
108	vm_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. */
137	static int
138	vm_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. */
154	static void *
155	vm_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	}