1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/* Load a shared object at runtime, relocate it, and run its initializer.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <link.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <errno.h>
size_t _dl_global_scope_alloc;
struct link_map *
_dl_open (const char *file, int mode)
{
struct link_map *new, *l;
ElfW(Addr) init;
struct r_debug *r;
/* Load the named object. */
new = _dl_map_object (NULL, file, lt_loaded);
if (new->l_searchlist)
/* It was already open. */
return new;
/* Load that object's dependencies. */
_dl_map_object_deps (new, NULL, 0);
/* Relocate the objects loaded. We do this in reverse order so that copy
relocs of earlier objects overwrite the data written by later objects. */
l = new;
while (l->l_next)
l = l->l_next;
while (1)
{
if (! l->l_relocated)
{
_dl_relocate_object (l, _dl_object_relocation_scope (l),
(mode & RTLD_BINDING_MASK) == RTLD_LAZY);
*_dl_global_scope_end = NULL;
}
if (l == new)
break;
l = l->l_prev;
}
new->l_global = (mode & RTLD_GLOBAL);
if (new->l_global)
{
/* The symbols of the new object and its dependencies are to be
introduced into the global scope that will be used to resolve
references from other dynamically-loaded objects. */
if (_dl_global_scope_alloc == 0)
{
/* This is the first dynamic object given global scope. */
_dl_global_scope_alloc = 8;
_dl_global_scope = malloc (8 * sizeof (struct link_map *));
if (! _dl_global_scope)
{
_dl_global_scope = _dl_default_scope;
nomem:
_dl_close (new);
_dl_signal_error (ENOMEM, file, "cannot extend global scope");
}
_dl_global_scope[2] = _dl_default_scope[2];
_dl_global_scope[3] = new;
_dl_global_scope[4] = NULL;
_dl_global_scope[5] = NULL;
}
else
{
if (_dl_global_scope_alloc <
_dl_global_scope_end - _dl_global_scope + 2)
{
/* Must extend the list. */
struct link_map **new = realloc (_dl_global_scope,
_dl_global_scope_alloc * 2);
if (! new)
goto nomem;
_dl_global_scope_end = new + (_dl_global_scope_end -
_dl_global_scope);
_dl_global_scope = new;
_dl_global_scope_alloc *= 2;
}
/* Append the new object and re-terminate the list. */
*_dl_global_scope_end++ = new;
/* We keep the list double-terminated so the last element
can be filled in for symbol lookups. */
_dl_global_scope_end[0] = NULL;
_dl_global_scope_end[1] = NULL;
}
}
/* Notify the debugger we have added some objects. We need to call
_dl_debug_initialize in a static program in case dynamic linking has
not been used before. */
r = _dl_debug_initialize (0);
r->r_state = RT_ADD;
_dl_debug_state ();
/* Run the initializer functions of new objects. */
while (init = _dl_init_next (new))
(*(void (*) (void)) init) ();
return new;
}
|
