Mercurial > cpython-lru_cache-weakref

annotate Modules/_ctypes/callbacks.c @ 70817:dd775b1561ba

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Fix markup.
author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents dc245d681901
children eae8e4ab0455
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1 #include "Python.h"
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2 #include "frameobject.h"
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3
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4 #include <ffi.h>
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5 #ifdef MS_WIN32
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6 #include <windows.h>
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7 #endif
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8 #include "ctypes.h"
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9
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10 /**************************************************************/
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11
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12 static void
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13 CThunkObject_dealloc(PyObject *_self)
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14 {
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15 CThunkObject *self = (CThunkObject *)_self;
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16 Py_XDECREF(self->converters);
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17 Py_XDECREF(self->callable);
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18 Py_XDECREF(self->restype);
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19 if (self->pcl_write)
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20 ffi_closure_free(self->pcl_write);
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21 PyObject_GC_Del(self);
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22 }
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23
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24 static int
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25 CThunkObject_traverse(PyObject *_self, visitproc visit, void *arg)
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26 {
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27 CThunkObject *self = (CThunkObject *)_self;
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28 Py_VISIT(self->converters);
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29 Py_VISIT(self->callable);
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30 Py_VISIT(self->restype);
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31 return 0;
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32 }
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33
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34 static int
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35 CThunkObject_clear(PyObject *_self)
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36 {
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37 CThunkObject *self = (CThunkObject *)_self;
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38 Py_CLEAR(self->converters);
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39 Py_CLEAR(self->callable);
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40 Py_CLEAR(self->restype);
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41 return 0;
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42 }
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43
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44 PyTypeObject PyCThunk_Type = {
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45 PyVarObject_HEAD_INIT(NULL, 0)
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46 "_ctypes.CThunkObject",
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47 sizeof(CThunkObject), /* tp_basicsize */
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48 sizeof(ffi_type), /* tp_itemsize */
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49 CThunkObject_dealloc, /* tp_dealloc */
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50 0, /* tp_print */
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51 0, /* tp_getattr */
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52 0, /* tp_setattr */
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53 0, /* tp_reserved */
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54 0, /* tp_repr */
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55 0, /* tp_as_number */
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56 0, /* tp_as_sequence */
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57 0, /* tp_as_mapping */
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58 0, /* tp_hash */
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59 0, /* tp_call */
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60 0, /* tp_str */
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61 0, /* tp_getattro */
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62 0, /* tp_setattro */
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63 0, /* tp_as_buffer */
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64 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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65 "CThunkObject", /* tp_doc */
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66 CThunkObject_traverse, /* tp_traverse */
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67 CThunkObject_clear, /* tp_clear */
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68 0, /* tp_richcompare */
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69 0, /* tp_weaklistoffset */
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70 0, /* tp_iter */
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71 0, /* tp_iternext */
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72 0, /* tp_methods */
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73 0, /* tp_members */
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74 };
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75
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76 /**************************************************************/
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77
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78 static void
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79 PrintError(char *msg, ...)
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80 {
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81 char buf[512];
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82 PyObject *f = PySys_GetObject("stderr");
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83 va_list marker;
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84
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85 va_start(marker, msg);
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86 vsnprintf(buf, sizeof(buf), msg, marker);
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87 va_end(marker);
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88 if (f != NULL && f != Py_None)
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89 PyFile_WriteString(buf, f);
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90 PyErr_Print();
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91 }
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92
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93
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94 /* after code that pyrex generates */
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95 void _ctypes_add_traceback(char *funcname, char *filename, int lineno)
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96 {
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97 PyObject *py_globals = 0;
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98 PyCodeObject *py_code = 0;
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99 PyFrameObject *py_frame = 0;
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100
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101 py_globals = PyDict_New();
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102 if (!py_globals) goto bad;
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103 py_code = PyCode_NewEmpty(filename, funcname, lineno);
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104 if (!py_code) goto bad;
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105 py_frame = PyFrame_New(
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106 PyThreadState_Get(), /*PyThreadState *tstate,*/
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107 py_code, /*PyCodeObject *code,*/
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108 py_globals, /*PyObject *globals,*/
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109 0 /*PyObject *locals*/
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110 );
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111 if (!py_frame) goto bad;
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112 py_frame->f_lineno = lineno;
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113 PyTraceBack_Here(py_frame);
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114 bad:
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115 Py_XDECREF(py_globals);
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116 Py_XDECREF(py_code);
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117 Py_XDECREF(py_frame);
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118 }
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119
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120 #ifdef MS_WIN32
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121 /*
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122 * We must call AddRef() on non-NULL COM pointers we receive as arguments
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123 * to callback functions - these functions are COM method implementations.
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124 * The Python instances we create have a __del__ method which calls Release().
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125 *
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126 * The presence of a class attribute named '_needs_com_addref_' triggers this
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127 * behaviour. It would also be possible to call the AddRef() Python method,
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128 * after checking for PyObject_IsTrue(), but this would probably be somewhat
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129 * slower.
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130 */
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131 static void
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132 TryAddRef(StgDictObject *dict, CDataObject *obj)
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133 {
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134 IUnknown *punk;
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135
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136 if (NULL == PyDict_GetItemString((PyObject *)dict, "_needs_com_addref_"))
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137 return;
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138
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139 punk = *(IUnknown **)obj->b_ptr;
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140 if (punk)
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141 punk->lpVtbl->AddRef(punk);
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142 return;
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143 }
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144 #endif
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145
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146 /******************************************************************************
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147 *
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148 * Call the python object with all arguments
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149 *
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150 */
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151 static void _CallPythonObject(void *mem,
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152 ffi_type *restype,
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153 SETFUNC setfunc,
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154 PyObject *callable,
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155 PyObject *converters,
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156 int flags,
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157 void **pArgs)
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158 {
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159 Py_ssize_t i;
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160 PyObject *result;
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161 PyObject *arglist = NULL;
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162 Py_ssize_t nArgs;
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163 PyObject *error_object = NULL;
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164 int *space;
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165 #ifdef WITH_THREAD
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166 PyGILState_STATE state = PyGILState_Ensure();
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167 #endif
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168
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169 nArgs = PySequence_Length(converters);
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170 /* Hm. What to return in case of error?
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171 For COM, 0xFFFFFFFF seems better than 0.
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172 */
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173 if (nArgs < 0) {
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174 PrintError("BUG: PySequence_Length");
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175 goto Done;
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176 }
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177
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178 arglist = PyTuple_New(nArgs);
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179 if (!arglist) {
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180 PrintError("PyTuple_New()");
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181 goto Done;
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182 }
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183 for (i = 0; i < nArgs; ++i) {
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184 /* Note: new reference! */
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185 PyObject *cnv = PySequence_GetItem(converters, i);
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186 StgDictObject *dict;
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187 if (cnv)
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188 dict = PyType_stgdict(cnv);
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189 else {
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190 PrintError("Getting argument converter %d\n", i);
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191 goto Done;
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192 }
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193
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194 if (dict && dict->getfunc && !_ctypes_simple_instance(cnv)) {
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195 PyObject *v = dict->getfunc(*pArgs, dict->size);
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196 if (!v) {
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197 PrintError("create argument %d:\n", i);
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198 Py_DECREF(cnv);
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199 goto Done;
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200 }
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201 PyTuple_SET_ITEM(arglist, i, v);
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202 /* XXX XXX XX
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203 We have the problem that c_byte or c_short have dict->size of
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204 1 resp. 4, but these parameters are pushed as sizeof(int) bytes.
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205 BTW, the same problem occurs when they are pushed as parameters
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206 */
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207 } else if (dict) {
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208 /* Hm, shouldn't we use PyCData_AtAddress() or something like that instead? */
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209 CDataObject *obj = (CDataObject *)PyObject_CallFunctionObjArgs(cnv, NULL);
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210 if (!obj) {
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211 PrintError("create argument %d:\n", i);
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212 Py_DECREF(cnv);
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213 goto Done;
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214 }
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215 if (!CDataObject_Check(obj)) {
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216 Py_DECREF(obj);
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217 Py_DECREF(cnv);
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218 PrintError("unexpected result of create argument %d:\n", i);
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219 goto Done;
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220 }
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221 memcpy(obj->b_ptr, *pArgs, dict->size);
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222 PyTuple_SET_ITEM(arglist, i, (PyObject *)obj);
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223 #ifdef MS_WIN32
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224 TryAddRef(dict, obj);
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225 #endif
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226 } else {
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227 PyErr_SetString(PyExc_TypeError,
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228 "cannot build parameter");
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229 PrintError("Parsing argument %d\n", i);
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230 Py_DECREF(cnv);
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231 goto Done;
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232 }
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233 Py_DECREF(cnv);
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234 /* XXX error handling! */
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235 pArgs++;
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236 }
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237
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238 #define CHECK(what, x) \
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239 if (x == NULL) _ctypes_add_traceback(what, "_ctypes/callbacks.c", __LINE__ - 1), PyErr_Print()
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240
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241 if (flags & (FUNCFLAG_USE_ERRNO | FUNCFLAG_USE_LASTERROR)) {
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242 error_object = _ctypes_get_errobj(&space);
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243 if (error_object == NULL)
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244 goto Done;
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245 if (flags & FUNCFLAG_USE_ERRNO) {
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246 int temp = space[0];
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247 space[0] = errno;
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248 errno = temp;
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249 }
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250 #ifdef MS_WIN32
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251 if (flags & FUNCFLAG_USE_LASTERROR) {
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252 int temp = space[1];
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253 space[1] = GetLastError();
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254 SetLastError(temp);
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255 }
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256 #endif
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257 }
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258
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259 result = PyObject_CallObject(callable, arglist);
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260 CHECK("'calling callback function'", result);
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261
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262 #ifdef MS_WIN32
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263 if (flags & FUNCFLAG_USE_LASTERROR) {
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264 int temp = space[1];
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265 space[1] = GetLastError();
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266 SetLastError(temp);
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267 }
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268 #endif
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269 if (flags & FUNCFLAG_USE_ERRNO) {
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270 int temp = space[0];
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271 space[0] = errno;
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272 errno = temp;
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273 }
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274 Py_XDECREF(error_object);
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275
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276 if ((restype != &ffi_type_void) && result) {
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277 PyObject *keep;
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278 assert(setfunc);
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279 #ifdef WORDS_BIGENDIAN
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280 /* See the corresponding code in callproc.c, around line 961 */
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281 if (restype->type != FFI_TYPE_FLOAT && restype->size < sizeof(ffi_arg))
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282 mem = (char *)mem + sizeof(ffi_arg) - restype->size;
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283 #endif
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284 keep = setfunc(mem, result, 0);
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285 CHECK("'converting callback result'", keep);
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286 /* keep is an object we have to keep alive so that the result
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287 stays valid. If there is no such object, the setfunc will
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288 have returned Py_None.
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289
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290 If there is such an object, we have no choice than to keep
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291 it alive forever - but a refcount and/or memory leak will
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292 be the result. EXCEPT when restype is py_object - Python
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293 itself knows how to manage the refcount of these objects.
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294 */
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295 if (keep == NULL) /* Could not convert callback result. */
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296 PyErr_WriteUnraisable(callable);
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297 else if (keep == Py_None) /* Nothing to keep */
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298 Py_DECREF(keep);
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299 else if (setfunc != _ctypes_get_fielddesc("O")->setfunc) {
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300 if (-1 == PyErr_WarnEx(PyExc_RuntimeWarning,
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301 "memory leak in callback function.",
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302 1))
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303 PyErr_WriteUnraisable(callable);
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304 }
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305 }
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306 Py_XDECREF(result);
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307 Done:
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308 Py_XDECREF(arglist);
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309 #ifdef WITH_THREAD
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310 PyGILState_Release(state);
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311 #endif
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312 }
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313
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314 static void closure_fcn(ffi_cif *cif,
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315 void *resp,
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316 void **args,
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317 void *userdata)
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318 {
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319 CThunkObject *p = (CThunkObject *)userdata;
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320
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321 _CallPythonObject(resp,
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322 p->ffi_restype,
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323 p->setfunc,
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324 p->callable,
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325 p->converters,
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326 p->flags,
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327 args);
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328 }
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329
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330 static CThunkObject* CThunkObject_new(Py_ssize_t nArgs)
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331 {
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332 CThunkObject *p;
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333 int i;
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334
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335 p = PyObject_GC_NewVar(CThunkObject, &PyCThunk_Type, nArgs);
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336 if (p == NULL) {
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337 PyErr_NoMemory();
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338 return NULL;
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339 }
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340
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341 p->pcl_exec = NULL;
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342 p->pcl_write = NULL;
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343 memset(&p->cif, 0, sizeof(p->cif));
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344 p->converters = NULL;
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345 p->callable = NULL;
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346 p->setfunc = NULL;
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347 p->ffi_restype = NULL;
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348
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349 for (i = 0; i < nArgs + 1; ++i)
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350 p->atypes[i] = NULL;
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351 PyObject_GC_Track((PyObject *)p);
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352 return p;
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353 }
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354
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355 CThunkObject *_ctypes_alloc_callback(PyObject *callable,
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356 PyObject *converters,
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357 PyObject *restype,
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358 int flags)
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359 {
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360 int result;
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361 CThunkObject *p;
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362 Py_ssize_t nArgs, i;
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363 ffi_abi cc;
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364
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365 nArgs = PySequence_Size(converters);
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366 p = CThunkObject_new(nArgs);
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367 if (p == NULL)
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368 return NULL;
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369
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370 assert(CThunk_CheckExact((PyObject *)p));
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371
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372 p->pcl_write = ffi_closure_alloc(sizeof(ffi_closure),
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373 &p->pcl_exec);
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374 if (p->pcl_write == NULL) {
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375 PyErr_NoMemory();
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376 goto error;
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377 }
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378
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379 p->flags = flags;
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380 for (i = 0; i < nArgs; ++i) {
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381 PyObject *cnv = PySequence_GetItem(converters, i);
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382 if (cnv == NULL)
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383 goto error;
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384 p->atypes[i] = _ctypes_get_ffi_type(cnv);
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385 Py_DECREF(cnv);
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386 }
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387 p->atypes[i] = NULL;
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388
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389 Py_INCREF(restype);
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390 p->restype = restype;
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391 if (restype == Py_None) {
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392 p->setfunc = NULL;
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393 p->ffi_restype = &ffi_type_void;
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394 } else {
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395 StgDictObject *dict = PyType_stgdict(restype);
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396 if (dict == NULL || dict->setfunc == NULL) {
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397 PyErr_SetString(PyExc_TypeError,
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398 "invalid result type for callback function");
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399 goto error;
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400 }
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401 p->setfunc = dict->setfunc;
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402 p->ffi_restype = &dict->ffi_type_pointer;
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403 }
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404
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405 cc = FFI_DEFAULT_ABI;
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cc992d75d5b3 Four months of trunk changes (including a few releases...)
Thomas Wouters <thomas@python.org>
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406 #if defined(MS_WIN32) && !defined(_WIN32_WCE) && !defined(MS_WIN64)
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407 if ((flags & FUNCFLAG_CDECL) == 0)
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408 cc = FFI_STDCALL;
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409 #endif
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410 result = ffi_prep_cif(&p->cif, cc,
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411 Py_SAFE_DOWNCAST(nArgs, Py_ssize_t, int),
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412 _ctypes_get_ffi_type(restype),
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413 &p->atypes[0]);
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414 if (result != FFI_OK) {
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415 PyErr_Format(PyExc_RuntimeError,
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416 "ffi_prep_cif failed with %d", result);
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417 goto error;
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418 }
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419 #if defined(X86_DARWIN) || defined(POWERPC_DARWIN)
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420 result = ffi_prep_closure(p->pcl_write, &p->cif, closure_fcn, p);
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421 #else
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422 result = ffi_prep_closure_loc(p->pcl_write, &p->cif, closure_fcn,
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423 p,
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424 p->pcl_exec);
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425 #endif
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426 if (result != FFI_OK) {
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427 PyErr_Format(PyExc_RuntimeError,
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428 "ffi_prep_closure failed with %d", result);
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429 goto error;
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430 }
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431
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432 Py_INCREF(converters);
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433 p->converters = converters;
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434 Py_INCREF(callable);
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435 p->callable = callable;
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436 return p;
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437
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438 error:
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439 Py_XDECREF(p);
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440 return NULL;
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441 }
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442
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443 #ifdef MS_WIN32
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444
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445 static void LoadPython(void)
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446 {
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447 if (!Py_IsInitialized()) {
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448 #ifdef WITH_THREAD
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449 PyEval_InitThreads();
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450 #endif
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451 Py_Initialize();
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452 }
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453 }
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454
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455 /******************************************************************/
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456
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457 long Call_GetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
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458 {
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459 PyObject *mod, *func, *result;
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460 long retval;
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461 static PyObject *context;
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462
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463 if (context == NULL)
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464 context = PyUnicode_InternFromString("_ctypes.DllGetClassObject");
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465
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466 mod = PyImport_ImportModuleNoBlock("ctypes");
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467 if (!mod) {
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468 PyErr_WriteUnraisable(context ? context : Py_None);
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469 /* There has been a warning before about this already */
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470 return E_FAIL;
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471 }
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472
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473 func = PyObject_GetAttrString(mod, "DllGetClassObject");
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474 Py_DECREF(mod);
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475 if (!func) {
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476 PyErr_WriteUnraisable(context ? context : Py_None);
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477 return E_FAIL;
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478 }
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479
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480 {
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481 PyObject *py_rclsid = PyLong_FromVoidPtr((void *)rclsid);
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482 PyObject *py_riid = PyLong_FromVoidPtr((void *)riid);
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483 PyObject *py_ppv = PyLong_FromVoidPtr(ppv);
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484 if (!py_rclsid || !py_riid || !py_ppv) {
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485 Py_XDECREF(py_rclsid);
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486 Py_XDECREF(py_riid);
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487 Py_XDECREF(py_ppv);
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488 Py_DECREF(func);
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489 PyErr_WriteUnraisable(context ? context : Py_None);
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490 return E_FAIL;
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491 }
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492 result = PyObject_CallFunctionObjArgs(func,
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493 py_rclsid,
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494 py_riid,
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495 py_ppv,
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496 NULL);
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497 Py_DECREF(py_rclsid);
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498 Py_DECREF(py_riid);
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499 Py_DECREF(py_ppv);
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500 }
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501 Py_DECREF(func);
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502 if (!result) {
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503 PyErr_WriteUnraisable(context ? context : Py_None);
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504 return E_FAIL;
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505 }
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506
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507 retval = PyLong_AsLong(result);
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508 if (PyErr_Occurred()) {
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509 PyErr_WriteUnraisable(context ? context : Py_None);
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510 retval = E_FAIL;
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511 }
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512 Py_DECREF(result);
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513 return retval;
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514 }
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515
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516 STDAPI DllGetClassObject(REFCLSID rclsid,
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517 REFIID riid,
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518 LPVOID *ppv)
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519 {
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520 long result;
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521 #ifdef WITH_THREAD
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522 PyGILState_STATE state;
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523 #endif
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524
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525 LoadPython();
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526 #ifdef WITH_THREAD
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527 state = PyGILState_Ensure();
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528 #endif
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529 result = Call_GetClassObject(rclsid, riid, ppv);
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530 #ifdef WITH_THREAD
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531 PyGILState_Release(state);
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532 #endif
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533 return result;
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534 }
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535
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536 long Call_CanUnloadNow(void)
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537 {
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538 PyObject *mod, *func, *result;
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539 long retval;
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540 static PyObject *context;
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541
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542 if (context == NULL)
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543 context = PyUnicode_InternFromString("_ctypes.DllCanUnloadNow");
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544
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545 mod = PyImport_ImportModuleNoBlock("ctypes");
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546 if (!mod) {
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547 /* OutputDebugString("Could not import ctypes"); */
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548 /* We assume that this error can only occur when shutting
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549 down, so we silently ignore it */
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550 PyErr_Clear();
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551 return E_FAIL;
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552 }
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553 /* Other errors cannot be raised, but are printed to stderr */
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554 func = PyObject_GetAttrString(mod, "DllCanUnloadNow");
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555 Py_DECREF(mod);
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556 if (!func) {
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557 PyErr_WriteUnraisable(context ? context : Py_None);
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558 return E_FAIL;
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559 }
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560
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561 result = PyObject_CallFunction(func, NULL);
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562 Py_DECREF(func);
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563 if (!result) {
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564 PyErr_WriteUnraisable(context ? context : Py_None);
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565 return E_FAIL;
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566 }
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567
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568 retval = PyLong_AsLong(result);
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569 if (PyErr_Occurred()) {
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570 PyErr_WriteUnraisable(context ? context : Py_None);
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571 retval = E_FAIL;
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572 }
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573 Py_DECREF(result);
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574 return retval;
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575 }
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576
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577 /*
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578 DllRegisterServer and DllUnregisterServer still missing
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579 */
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580
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581 STDAPI DllCanUnloadNow(void)
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582 {
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583 long result;
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584 #ifdef WITH_THREAD
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585 PyGILState_STATE state = PyGILState_Ensure();
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586 #endif
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587 result = Call_CanUnloadNow();
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588 #ifdef WITH_THREAD
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589 PyGILState_Release(state);
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590 #endif
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591 return result;
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592 }
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593
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594 #ifndef Py_NO_ENABLE_SHARED
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595 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvRes)
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596 {
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597 switch(fdwReason) {
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598 case DLL_PROCESS_ATTACH:
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599 DisableThreadLibraryCalls(hinstDLL);
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600 break;
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601 }
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602 return TRUE;
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603 }
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604 #endif
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605
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606 #endif
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607
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608 /*
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609 Local Variables:
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610 compile-command: "cd .. && python setup.py -q build_ext"
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611 End:
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612 */