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
232
233
234
235
236
237
|
#include <malloc.h> /* for alloca() */
/************************************************************/
/* errno and GetLastError support */
struct cffi_errno_s {
int saved_errno;
int saved_lasterror;
};
static DWORD cffi_tls_index;
static void init_errno(void)
{
cffi_tls_index = TlsAlloc();
if (cffi_tls_index == TLS_OUT_OF_INDEXES)
PyErr_SetString(PyExc_WindowsError, "TlsAlloc() failed");
}
static struct cffi_errno_s *_geterrno_object(void)
{
LPVOID p = TlsGetValue(cffi_tls_index);
if (p == NULL) {
/* XXX this malloc() leaks */
p = malloc(sizeof(struct cffi_errno_s));
if (p == NULL)
return NULL;
memset(p, 0, sizeof(struct cffi_errno_s));
TlsSetValue(cffi_tls_index, p);
}
return (struct cffi_errno_s *)p;
}
static void save_errno(void)
{
int current_err = errno;
int current_lasterr = GetLastError();
struct cffi_errno_s *p;
p = _geterrno_object();
if (p != NULL) {
p->saved_errno = current_err;
p->saved_lasterror = current_lasterr;
}
/* else: cannot report the error */
}
static void save_errno_only(void)
{
int current_err = errno;
struct cffi_errno_s *p;
p = _geterrno_object();
if (p != NULL) {
p->saved_errno = current_err;
}
/* else: cannot report the error */
}
static void restore_errno(void)
{
struct cffi_errno_s *p;
p = _geterrno_object();
if (p != NULL) {
SetLastError(p->saved_lasterror);
errno = p->saved_errno;
}
/* else: cannot report the error */
}
static void restore_errno_only(void)
{
struct cffi_errno_s *p;
p = _geterrno_object();
if (p != NULL) {
errno = p->saved_errno;
}
/* else: cannot report the error */
}
#if PY_MAJOR_VERSION >= 3
static PyObject *b_getwinerror(PyObject *self, PyObject *args)
{
int err = -1;
int len;
WCHAR *s_buf = NULL; /* Free via LocalFree */
PyObject *v, *message;
if (!PyArg_ParseTuple(args, "|i", &err))
return NULL;
if (err == -1) {
struct cffi_errno_s *p;
p = _geterrno_object();
if (p == NULL)
return PyErr_NoMemory();
err = p->saved_lasterror;
}
len = FormatMessageW(
/* Error API error */
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, /* no message source */
err,
MAKELANGID(LANG_NEUTRAL,
SUBLANG_DEFAULT), /* Default language */
(LPWSTR) &s_buf,
0, /* size not used */
NULL); /* no args */
if (len==0) {
/* Only seen this in out of mem situations */
message = PyUnicode_FromFormat("Windows Error 0x%X", err);
} else {
/* remove trailing cr/lf and dots */
while (len > 0 && (s_buf[len-1] <= L' ' || s_buf[len-1] == L'.'))
s_buf[--len] = L'\0';
message = PyUnicode_FromWideChar(s_buf, len);
}
if (message != NULL)
v = Py_BuildValue("(iO)", err, message);
else
v = NULL;
LocalFree(s_buf);
return v;
}
#else
static PyObject *b_getwinerror(PyObject *self, PyObject *args)
{
int err = -1;
int len;
char *s;
char *s_buf = NULL; /* Free via LocalFree */
char s_small_buf[28]; /* Room for "Windows Error 0xFFFFFFFF" */
PyObject *v;
if (!PyArg_ParseTuple(args, "|i", &err))
return NULL;
if (err == -1) {
struct cffi_errno_s *p;
p = _geterrno_object();
if (p == NULL)
return PyErr_NoMemory();
err = p->saved_lasterror;
}
len = FormatMessage(
/* Error API error */
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, /* no message source */
err,
MAKELANGID(LANG_NEUTRAL,
SUBLANG_DEFAULT), /* Default language */
(LPTSTR) &s_buf,
0, /* size not used */
NULL); /* no args */
if (len==0) {
/* Only seen this in out of mem situations */
sprintf(s_small_buf, "Windows Error 0x%X", err);
s = s_small_buf;
s_buf = NULL;
} else {
s = s_buf;
/* remove trailing cr/lf and dots */
while (len > 0 && (s[len-1] <= ' ' || s[len-1] == '.'))
s[--len] = '\0';
}
v = Py_BuildValue("(is)", err, s);
LocalFree(s_buf);
return v;
}
#endif
/************************************************************/
/* Emulate dlopen()&co. from the Windows API */
#define RTLD_LAZY 0
#define RTLD_NOW 0
#define RTLD_GLOBAL 0
#define RTLD_LOCAL 0
static void *dlopen(const char *filename, int flag)
{
return (void *)LoadLibrary(filename);
}
static void *dlsym(void *handle, const char *symbol)
{
void *address = GetProcAddress((HMODULE)handle, symbol);
#ifndef MS_WIN64
if (!address) {
/* If 'symbol' is not found, then try '_symbol@N' for N in
(0, 4, 8, 12, ..., 124). Unlike ctypes, we try to do that
for any symbol, although in theory it should only be done
for __stdcall functions.
*/
int i;
char *mangled_name = alloca(1 + strlen(symbol) + 1 + 3 + 1);
if (!mangled_name)
return NULL;
for (i = 0; i < 32; i++) {
sprintf(mangled_name, "_%s@%d", symbol, i * 4);
address = GetProcAddress((HMODULE)handle, mangled_name);
if (address)
break;
}
}
#endif
return address;
}
static void dlclose(void *handle)
{
FreeLibrary((HMODULE)handle);
}
static const char *dlerror(void)
{
static char buf[32];
DWORD dw = GetLastError();
if (dw == 0)
return NULL;
sprintf(buf, "error 0x%x", (unsigned int)dw);
return buf;
}
/************************************************************/
/* obscure */
#define ffi_prep_closure(a,b,c,d) ffi_prep_closure_loc(a,b,c,d,a)
|
