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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/* Storage management for the chain of loaded shared objects.
Copyright (C) 1995, 1996, 1997, 1998, 1999 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <elf/ldsodefs.h>
#include <assert.h>
/* Allocate a `struct link_map' for a new object being loaded,
and enter it into the _dl_loaded list. */
struct link_map *
internal_function
_dl_new_object (char *realname, const char *libname, int type,
struct link_map *loader)
{
struct link_map *l;
int idx;
size_t libname_len = strlen (libname) + 1;
struct link_map *new = calloc (sizeof *new, 1);
struct libname_list *newname = malloc (sizeof *newname + libname_len);
if (! new || ! newname)
return NULL;
new->l_name = realname;
newname->name = memcpy (newname + 1, libname, libname_len);
newname->next = NULL;
new->l_libname = newname;
new->l_type = type;
new->l_loader = loader;
/* new->l_global = 0; We use calloc therefore not necessary. */
/* Counter for the scopes we have to handle. */
idx = 0;
if (_dl_loaded != NULL)
{
l = _dl_loaded;
while (l->l_next)
l = l->l_next;
new->l_prev = l;
/* new->l_next = NULL; Would be necesary but we use calloc. */
l->l_next = new;
/* Add the global scope. */
new->l_scope[idx++] = &_dl_loaded->l_searchlist;
}
else
_dl_loaded = new;
/* This is our local scope. */
if (loader != NULL)
{
while (loader->l_loader != NULL)
loader = loader->l_loader;
new->l_scope[idx] = &loader->l_searchlist;
}
else
new->l_scope[idx] = &new->l_searchlist;
new->l_local_scope[0] = &new->l_searchlist;
/* Don't try to find the origin for the main map which has the name "". */
if (realname[0] != '\0')
{
char *origin;
if (realname[0] == '/')
{
/* It an absolute path. Use it. But we have to make a copy since
we strip out the trailing slash. */
size_t len = strlen (realname) + 1;
origin = malloc (len);
if (origin == NULL)
origin = (char *) -1;
else
memcpy (origin, realname, len);
}
else
{
size_t realname_len = strlen (realname) + 1;
size_t len = 128 + realname_len;
char *result = NULL;
/* Get the current directory name. */
origin = malloc (len);
while (origin != NULL
&& (result = __getcwd (origin, len - realname_len)) == NULL
&& errno == ERANGE)
{
len += 128;
origin = (char *) realloc (origin, len);
}
if (result == NULL)
{
/* We were not able to determine the current directory. */
if (origin != NULL)
free (origin);
origin = (char *) -1;
}
else
{
/* Now append the filename. */
char *cp = strchr (origin, '\0');
if (cp [-1] != '/')
*cp++ = '/';
memcpy (cp, realname, realname_len);
}
}
if (origin != (char *) -1)
{
/* Now remove the filename and the slash. Do this even if the
string is something like "/foo" which leaves an empty string. */
char *last = strrchr (origin, '/');
if (last == origin)
origin[1] = '\0';
else
*last = '\0';
}
new->l_origin = origin;
}
return new;
}
|
