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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/*
Copyright (c) 2002 Peter O'Gorman <ogorman@users.sourceforge.net>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* Just to prove that it isn't that hard to add Mac calls to your code :)
This works with pretty much everything, including kde3 xemacs and the gimp,
I'd guess that it'd work in at least 95% of cases, use this as your starting
point, rather than the mess that is dlfcn.c, assuming that your code does not
require ref counting or symbol lookups in dependent libraries
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/param.h> // XXX: needed?
#include <sys/stat.h>
#include <stdarg.h>
#include <limits.h>
#include <mach-o/dyld.h>
#include "dlfcn.h"
#define ERR_STR_LEN 256
static void *dlsymIntern(void *handle, const char *symbol);
static const char *error(int setget, const char *str, ...);
/* Set and get the error string for use by dlerror */
static const char *error(int setget, const char *str, ...)
{
static char errstr[ERR_STR_LEN];
static int err_filled = 0;
const char *retval;
va_list arg;
if (setget == 0)
{
va_start(arg, str);
strncpy(errstr, "dlsimple: ", ERR_STR_LEN);
vsnprintf(errstr + 10, ERR_STR_LEN - 10, str, arg);
va_end(arg);
err_filled = 1;
retval = NULL;
}
else
{
if (!err_filled)
retval = NULL;
else
retval = errstr;
err_filled = 0;
}
return retval;
}
/* dlopen */
void *dlopen(const char *path, int mode)
{
void *module = 0;
NSObjectFileImage ofi = 0;
NSObjectFileImageReturnCode ofirc;
static int (*make_private_module_public) (NSModule module) = 0;
unsigned int flags = NSLINKMODULE_OPTION_RETURN_ON_ERROR | NSLINKMODULE_OPTION_PRIVATE;
/* If we got no path, the app wants the global namespace, use -1 as the marker
in this case */
if (!path)
return (void *)-1;
/* Create the object file image, works for things linked with the -bundle arg to ld */
ofirc = NSCreateObjectFileImageFromFile(path, &ofi);
switch (ofirc)
{
case NSObjectFileImageSuccess:
/* It was okay, so use NSLinkModule to link in the image */
if (!(mode & RTLD_LAZY)) flags += NSLINKMODULE_OPTION_BINDNOW;
module = NSLinkModule(ofi, path,flags);
/* Don't forget to destroy the object file image, unless you like leaks */
NSDestroyObjectFileImage(ofi);
/* If the mode was global, then change the module, this avoids
multiply defined symbol errors to first load private then make
global. Silly, isn't it. */
if ((mode & RTLD_GLOBAL))
{
if (!make_private_module_public)
{
_dyld_func_lookup("__dyld_NSMakePrivateModulePublic",
(unsigned long *)&make_private_module_public);
}
make_private_module_public(module);
}
break;
case NSObjectFileImageInappropriateFile:
/* It may have been a dynamic library rather than a bundle, try to load it */
module = (void *)NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR);
break;
case NSObjectFileImageFailure:
error(0,"Object file setup failure : \"%s\"", path);
return 0;
case NSObjectFileImageArch:
error(0,"No object for this architecture : \"%s\"", path);
return 0;
case NSObjectFileImageFormat:
error(0,"Bad object file format : \"%s\"", path);
return 0;
case NSObjectFileImageAccess:
error(0,"Can't read object file : \"%s\"", path);
return 0;
}
if (!module)
error(0, "Can not open \"%s\"", path);
return module;
}
/* dlsymIntern is used by dlsym to find the symbol */
void *dlsymIntern(void *handle, const char *symbol)
{
NSSymbol *nssym = 0;
/* If the handle is -1, if is the app global context */
if (handle == (void *)-1)
{
/* Global context, use NSLookupAndBindSymbol */
if (NSIsSymbolNameDefined(symbol))
{
nssym = NSLookupAndBindSymbol(symbol);
}
}
/* Now see if the handle is a struch mach_header* or not, use NSLookupSymbol in image
for libraries, and NSLookupSymbolInModule for bundles */
else
{
/* Check for both possible magic numbers depending on x86/ppc byte order */
if ((((struct mach_header *)handle)->magic == MH_MAGIC) ||
(((struct mach_header *)handle)->magic == MH_CIGAM))
{
if (NSIsSymbolNameDefinedInImage((struct mach_header *)handle, symbol))
{
nssym = NSLookupSymbolInImage((struct mach_header *)handle,
symbol,
NSLOOKUPSYMBOLINIMAGE_OPTION_BIND
| NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
}
}
else
{
nssym = NSLookupSymbolInModule(handle, symbol);
}
}
if (!nssym)
{
error(0, "Symbol \"%s\" Not found", symbol);
return NULL;
}
return NSAddressOfSymbol(nssym);
}
const char *dlerror(void)
{
return error(1, (char *)NULL);
}
int dlclose(void *handle)
{
if ((((struct mach_header *)handle)->magic == MH_MAGIC) ||
(((struct mach_header *)handle)->magic == MH_CIGAM))
{
error(0, "Can't remove dynamic libraries on darwin");
return 0;
}
if (!NSUnLinkModule(handle, 0))
{
error(0, "unable to unlink module %s", NSNameOfModule(handle));
return 1;
}
return 0;
}
/* dlsym, prepend the underscore and call dlsymIntern */
void *dlsym(void *handle, const char *symbol)
{
static char undersym[257]; /* Saves calls to malloc(3) */
int sym_len = strlen(symbol);
void *value = NULL;
char *malloc_sym = NULL;
if (sym_len < 256)
{
snprintf(undersym, 256, "_%s", symbol);
value = dlsymIntern(handle, undersym);
}
else
{
malloc_sym = malloc(sym_len + 2);
if (malloc_sym)
{
sprintf(malloc_sym, "_%s", symbol);
value = dlsymIntern(handle, malloc_sym);
free(malloc_sym);
}
else
{
error(0, "Unable to allocate memory");
}
}
return value;
}
|
