Mercurial > cpython-lru_cache-weakref

annotate Modules/dlmodule.c @ 39940:dfd809dcf680 2.5

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Bug #1446043: correctly raise a LookupError if an encoding name given to encodings.search_function() contains a dot. (backport from rev. 52075)
author Georg Brandl <georg@python.org>
date Sat, 30 Sep 2006 11:22:35 +0000
parents c67b23397f30
children 6620a510e9a9
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1
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2 /* dl module */
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3
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4 #include "Python.h"
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5
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6 #include <dlfcn.h>
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7
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8 #ifdef __VMS
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9 #include <unistd.h>
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10 #endif
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11
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12 #ifndef RTLD_LAZY
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13 #define RTLD_LAZY 1
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14 #endif
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15
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16 typedef void *PyUnivPtr;
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17 typedef struct {
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18 PyObject_HEAD
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19 PyUnivPtr *dl_handle;
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20 } dlobject;
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21
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22 static PyTypeObject Dltype;
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23
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24 static PyObject *Dlerror;
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25
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26 static PyObject *
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27 newdlobject(PyUnivPtr *handle)
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28 {
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29 dlobject *xp;
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30 xp = PyObject_New(dlobject, &Dltype);
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31 if (xp == NULL)
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32 return NULL;
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33 xp->dl_handle = handle;
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34 return (PyObject *)xp;
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35 }
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36
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37 static void
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38 dl_dealloc(dlobject *xp)
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39 {
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40 if (xp->dl_handle != NULL)
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41 dlclose(xp->dl_handle);
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42 PyObject_Del(xp);
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43 }
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44
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45 static PyObject *
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46 dl_close(dlobject *xp)
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47 {
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48 if (xp->dl_handle != NULL) {
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49 dlclose(xp->dl_handle);
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50 xp->dl_handle = NULL;
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51 }
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52 Py_INCREF(Py_None);
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53 return Py_None;
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54 }
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55
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56 static PyObject *
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57 dl_sym(dlobject *xp, PyObject *args)
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58 {
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59 char *name;
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60 PyUnivPtr *func;
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61 if (PyString_Check(args)) {
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62 name = PyString_AS_STRING(args);
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63 } else {
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64 PyErr_Format(PyExc_TypeError, "expected string, found %.200s",
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65 args->ob_type->tp_name);
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66 return NULL;
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67 }
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68 func = dlsym(xp->dl_handle, name);
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69 if (func == NULL) {
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70 Py_INCREF(Py_None);
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71 return Py_None;
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72 }
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73 return PyInt_FromLong((long)func);
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74 }
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75
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76 static PyObject *
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77 dl_call(dlobject *xp, PyObject *args)
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78 {
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79 PyObject *name;
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80 long (*func)(long, long, long, long, long,
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81 long, long, long, long, long);
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82 long alist[10];
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83 long res;
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84 Py_ssize_t i;
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85 Py_ssize_t n = PyTuple_Size(args);
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86 if (n < 1) {
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87 PyErr_SetString(PyExc_TypeError, "at least a name is needed");
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88 return NULL;
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89 }
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90 name = PyTuple_GetItem(args, 0);
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91 if (!PyString_Check(name)) {
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92 PyErr_SetString(PyExc_TypeError,
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93 "function name must be a string");
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94 return NULL;
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95 }
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96 func = (long (*)(long, long, long, long, long,
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97 long, long, long, long, long))
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98 dlsym(xp->dl_handle, PyString_AsString(name));
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99 if (func == NULL) {
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100 PyErr_SetString(PyExc_ValueError, dlerror());
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101 return NULL;
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102 }
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103 if (n-1 > 10) {
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104 PyErr_SetString(PyExc_TypeError,
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105 "too many arguments (max 10)");
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106 return NULL;
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107 }
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108 for (i = 1; i < n; i++) {
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109 PyObject *v = PyTuple_GetItem(args, i);
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110 if (PyInt_Check(v))
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111 alist[i-1] = PyInt_AsLong(v);
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112 else if (PyString_Check(v))
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113 alist[i-1] = (long)PyString_AsString(v);
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114 else if (v == Py_None)
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115 alist[i-1] = (long) ((char *)NULL);
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116 else {
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117 PyErr_SetString(PyExc_TypeError,
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118 "arguments must be int, string or None");
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119 return NULL;
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120 }
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121 }
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122 for (; i <= 10; i++)
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123 alist[i-1] = 0;
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124 res = (*func)(alist[0], alist[1], alist[2], alist[3], alist[4],
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125 alist[5], alist[6], alist[7], alist[8], alist[9]);
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126 return PyInt_FromLong(res);
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127 }
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128
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129 static PyMethodDef dlobject_methods[] = {
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130 {"call", (PyCFunction)dl_call, METH_VARARGS},
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131 {"sym", (PyCFunction)dl_sym, METH_O},
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132 {"close", (PyCFunction)dl_close, METH_NOARGS},
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133 {NULL, NULL} /* Sentinel */
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134 };
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135
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136 static PyObject *
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137 dl_getattr(dlobject *xp, char *name)
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138 {
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139 return Py_FindMethod(dlobject_methods, (PyObject *)xp, name);
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140 }
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141
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142
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143 static PyTypeObject Dltype = {
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144 PyObject_HEAD_INIT(NULL)
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145 0, /*ob_size*/
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146 "dl.dl", /*tp_name*/
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147 sizeof(dlobject), /*tp_basicsize*/
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148 0, /*tp_itemsize*/
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149 /* methods */
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150 (destructor)dl_dealloc, /*tp_dealloc*/
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151 0, /*tp_print*/
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152 (getattrfunc)dl_getattr,/*tp_getattr*/
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153 0, /*tp_setattr*/
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154 0, /*tp_compare*/
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155 0, /*tp_repr*/
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156 0, /*tp_as_number*/
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157 0, /*tp_as_sequence*/
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158 0, /*tp_as_mapping*/
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159 0, /*tp_hash*/
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160 };
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161
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162 static PyObject *
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163 dl_open(PyObject *self, PyObject *args)
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164 {
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165 char *name;
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166 int mode;
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167 PyUnivPtr *handle;
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168 if (sizeof(int) != sizeof(long) ||
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169 sizeof(long) != sizeof(char *)) {
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170 PyErr_SetString(PyExc_SystemError,
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171 "module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
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172 return NULL;
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173 }
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174
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175 if (PyArg_ParseTuple(args, "z:open", &name))
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176 mode = RTLD_LAZY;
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177 else {
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178 PyErr_Clear();
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179 if (!PyArg_ParseTuple(args, "zi:open", &name, &mode))
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180 return NULL;
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181 #ifndef RTLD_NOW
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182 if (mode != RTLD_LAZY) {
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183 PyErr_SetString(PyExc_ValueError, "mode must be 1");
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184 return NULL;
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185 }
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186 #endif
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187 }
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188 handle = dlopen(name, mode);
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189 if (handle == NULL) {
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190 PyErr_SetString(Dlerror, dlerror());
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191 return NULL;
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192 }
39043
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193 #ifdef __VMS
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194 /* Under OpenVMS dlopen doesn't do any check, just save the name
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195 * for later use, so we have to check if the file is readable,
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196 * the name can be a logical or a file from SYS$SHARE.
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197 */
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198 if (access(name, R_OK)) {
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199 char fname[strlen(name) + 20];
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200 strcpy(fname, "SYS$SHARE:");
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201 strcat(fname, name);
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202 strcat(fname, ".EXE");
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203 if (access(fname, R_OK)) {
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204 dlclose(handle);
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205 PyErr_SetString(Dlerror,
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206 "File not found or protection violation");
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207 return NULL;
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208 }
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209 }
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210 #endif
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211 return newdlobject(handle);
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212 }
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213
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214 static PyMethodDef dl_methods[] = {
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215 {"open", dl_open, METH_VARARGS},
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216 {NULL, NULL} /* sentinel */
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217 };
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218
14542
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diff changeset
219 /* From socketmodule.c
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220 * Convenience routine to export an integer value.
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221 *
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222 * Errors are silently ignored, for better or for worse...
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223 */
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224 static void
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diff changeset
225 insint(PyObject *d, char *name, int value)
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226 {
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diff changeset
227 PyObject *v = PyInt_FromLong((long) value);
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diff changeset
228 if (!v || PyDict_SetItemString(d, name, v))
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229 PyErr_Clear();
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230
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diff changeset
231 Py_XDECREF(v);
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diff changeset
232 }
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233
24471
f66b3a3509c7 Excise DL_EXPORT/DL_IMPORT from Modules/*. Required adding a prototype
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parents: 24280
diff changeset
234 PyMODINIT_FUNC
13651
8a063423e0b7 Bunch of minor ANSIfications: 'void initfunc()' -> 'void initfunc(void)',
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diff changeset
235 initdl(void)
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236 {
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237 PyObject *m, *d, *x;
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238
16804
8156879fe60d Patch #404680: disables the nis module and enables the dl module when
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parents: 16735
diff changeset
239 /* Initialize object type */
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diff changeset
240 Dltype.ob_type = &PyType_Type;
8156879fe60d Patch #404680: disables the nis module and enables the dl module when
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diff changeset
241
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diff changeset
242 /* Create the module and add the functions */
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diff changeset
243 m = Py_InitModule("dl", dl_methods);
36324
1af7f719ed28 Check return result from Py_InitModule*(). This API can fail.
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diff changeset
244 if (m == NULL)
1af7f719ed28 Check return result from Py_InitModule*(). This API can fail.
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diff changeset
245 return;
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246
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247 /* Add some symbolic constants to the module */
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diff changeset
248 d = PyModule_GetDict(m);
6367
2c29b8982643 Apply two changes, systematically:
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diff changeset
249 Dlerror = x = PyErr_NewException("dl.error", NULL, NULL);
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diff changeset
250 PyDict_SetItemString(d, "error", x);
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diff changeset
251 x = PyInt_FromLong((long)RTLD_LAZY);
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diff changeset
252 PyDict_SetItemString(d, "RTLD_LAZY", x);
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253 #define INSINT(X) insint(d,#X,X)
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254 #ifdef RTLD_NOW
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diff changeset
255 INSINT(RTLD_NOW);
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diff changeset
256 #endif
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diff changeset
257 #ifdef RTLD_NOLOAD
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diff changeset
258 INSINT(RTLD_NOLOAD);
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diff changeset
259 #endif
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diff changeset
260 #ifdef RTLD_GLOBAL
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diff changeset
261 INSINT(RTLD_GLOBAL);
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diff changeset
262 #endif
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diff changeset
263 #ifdef RTLD_LOCAL
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
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diff changeset
264 INSINT(RTLD_LOCAL);
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
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diff changeset
265 #endif
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
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diff changeset
266 #ifdef RTLD_PARENT
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
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diff changeset
267 INSINT(RTLD_PARENT);
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
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diff changeset
268 #endif
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
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diff changeset
269 #ifdef RTLD_GROUP
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diff changeset
270 INSINT(RTLD_GROUP);
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diff changeset
271 #endif
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diff changeset
272 #ifdef RTLD_WORLD
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diff changeset
273 INSINT(RTLD_WORLD);
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diff changeset
274 #endif
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diff changeset
275 #ifdef RTLD_NODELETE
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diff changeset
276 INSINT(RTLD_NODELETE);
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277 #endif
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278 }