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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* $XFree86: xc/programs/Xserver/hw/xfree86/loader/dlloader.c,v 1.13 2003/10/15 16:29:02 dawes Exp $ */
/*
*
* Copyright (c) 1997 The XFree86 Project, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of the
* XFree86 Project, Inc. not be used in advertising or publicity
* pertaining to distribution of the software without specific,
* written prior permission. The Xfree86 Project, Inc. makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THE XFREE86 PROJECT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE XFREE86 PROJECT, INC. BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE. */
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include "Xos.h"
#include "os.h"
#include "sym.h"
#include "loader.h"
#include "dlloader.h"
#ifdef DL_LAZY
#define DLOPEN_LAZY DL_LAZY
#else
#ifdef RTLD_LAZY
#define DLOPEN_LAZY RTLD_LAZY
#else
#ifdef __FreeBSD__
#define DLOPEN_LAZY 1
#else
#define DLOPEN_LAZY 0
#endif
#endif
#endif
#ifdef LD_GLOBAL
#define DLOPEN_GLOBAL LD_GLOBAL
#else
#ifdef RTLD_GLOBAL
#define DLOPEN_GLOBAL RTLD_GLOBAL
#else
#define DLOPEN_GLOBAL 0
#endif
#endif
#define DLOPEN_FLAGS ( DLOPEN_LAZY | DLOPEN_GLOBAL )
#if defined(CSRG_BASED) && !defined(__ELF__)
#define NEED_UNDERSCORE_FOR_DLLSYM
#endif
/*
* This structure contains all of the information about a module
* that has been loaded.
*/
typedef struct {
int handle;
void *dlhandle;
} DLModuleRec, *DLModulePtr;
/*
* a list of loaded modules XXX can be improved
*/
typedef struct DLModuleList {
DLModulePtr module;
struct DLModuleList *next;
} DLModuleList;
DLModuleList *dlModuleList = NULL;
/*
* Search a symbol in the module list
*/
void *
DLFindSymbol(const char *name)
{
DLModuleList *l;
void *p;
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
char *n;
n = xf86loadermalloc(strlen(name) + 2);
sprintf(n, "_%s", name);
#endif
(void)dlerror(); /* Clear out any previous error */
for (l = dlModuleList; l != NULL; l = l->next) {
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
p = dlsym(l->module->dlhandle, n);
#else
p = dlsym(l->module->dlhandle, name);
#endif
if (dlerror() == NULL) {
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
xf86loaderfree(n);
#endif
return p;
}
}
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
xf86loaderfree(n);
#endif
return NULL;
}
/*
* public interface
*/
void *
DLLoadModule(loaderPtr modrec, int fd, LOOKUP ** ppLookup)
{
DLModulePtr dlfile;
DLModuleList *l;
if ((dlfile = xf86loadercalloc(1, sizeof(DLModuleRec))) == NULL) {
ErrorF("Unable to allocate DLModuleRec\n");
return NULL;
}
dlfile->handle = modrec->handle;
dlfile->dlhandle = dlopen(modrec->name, DLOPEN_FLAGS);
if (dlfile->dlhandle == NULL) {
ErrorF("dlopen: %s\n", dlerror());
xf86loaderfree(dlfile);
return NULL;
}
/* Add it to the module list */
l = xf86loadermalloc(sizeof(DLModuleList));
l->module = dlfile;
l->next = dlModuleList;
dlModuleList = l;
*ppLookup = NULL;
return (void *)dlfile;
}
void
DLResolveSymbols(void *mod)
{
return;
}
int
DLCheckForUnresolved(void *mod)
{
return 0;
}
void
DLUnloadModule(void *modptr)
{
DLModulePtr dlfile = (DLModulePtr) modptr;
DLModuleList *l, *p;
/* remove it from dlModuleList */
if (dlModuleList->module == modptr) {
l = dlModuleList;
dlModuleList = l->next;
xf86loaderfree(l);
} else {
p = dlModuleList;
for (l = dlModuleList->next; l != NULL; l = l->next) {
if (l->module == modptr) {
p->next = l->next;
xf86loaderfree(l);
break;
}
p = l;
}
}
dlclose(dlfile->dlhandle);
xf86loaderfree(modptr);
}
|
