Mercurial > cpython-lru_cache-weakref

annotate Modules/dlmodule.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents fd25030223b0
children
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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 Py_TYPE(args)->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 PyVarObject_HEAD_INIT(NULL, 0)
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145 "dl.dl", /*tp_name*/
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146 sizeof(dlobject), /*tp_basicsize*/
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147 0, /*tp_itemsize*/
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148 /* methods */
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149 (destructor)dl_dealloc, /*tp_dealloc*/
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150 0, /*tp_print*/
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151 (getattrfunc)dl_getattr,/*tp_getattr*/
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152 0, /*tp_setattr*/
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153 0, /*tp_compare*/
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154 0, /*tp_repr*/
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155 0, /*tp_as_number*/
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156 0, /*tp_as_sequence*/
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157 0, /*tp_as_mapping*/
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158 0, /*tp_hash*/
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159 };
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160
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161 static PyObject *
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162 dl_open(PyObject *self, PyObject *args)
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163 {
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164 char *name;
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165 int mode;
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166 PyUnivPtr *handle;
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167 if (sizeof(int) != sizeof(long) ||
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168 sizeof(long) != sizeof(char *)) {
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169 PyErr_SetString(PyExc_SystemError,
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170 "module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
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171 return NULL;
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172 }
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173
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174 if (PyArg_ParseTuple(args, "z:open", &name))
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175 mode = RTLD_LAZY;
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176 else {
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177 PyErr_Clear();
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178 if (!PyArg_ParseTuple(args, "zi:open", &name, &mode))
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179 return NULL;
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180 #ifndef RTLD_NOW
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181 if (mode != RTLD_LAZY) {
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182 PyErr_SetString(PyExc_ValueError, "mode must be 1");
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183 return NULL;
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184 }
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185 #endif
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186 }
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187 handle = dlopen(name, mode);
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188 if (handle == NULL) {
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189 char *errmsg = dlerror();
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190 if (!errmsg)
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191 errmsg = "dlopen() error";
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192 PyErr_SetString(Dlerror, errmsg);
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193 return NULL;
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194 }
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195 #ifdef __VMS
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196 /* Under OpenVMS dlopen doesn't do any check, just save the name
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197 * for later use, so we have to check if the file is readable,
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198 * the name can be a logical or a file from SYS$SHARE.
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199 */
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200 if (access(name, R_OK)) {
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201 char fname[strlen(name) + 20];
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202 strcpy(fname, "SYS$SHARE:");
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203 strcat(fname, name);
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204 strcat(fname, ".EXE");
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205 if (access(fname, R_OK)) {
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206 dlclose(handle);
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207 PyErr_SetString(Dlerror,
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208 "File not found or protection violation");
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209 return NULL;
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210 }
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211 }
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Neal Norwitz <nnorwitz@gmail.com>
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diff changeset
212 #endif
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213 return newdlobject(handle);
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214 }
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215
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216 static PyMethodDef dl_methods[] = {
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217 {"open", dl_open, METH_VARARGS},
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218 {NULL, NULL} /* sentinel */
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219 };
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220
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221 /* From socketmodule.c
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222 * Convenience routine to export an integer value.
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223 *
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224 * Errors are silently ignored, for better or for worse...
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225 */
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226 static void
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227 insint(PyObject *d, char *name, int value)
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228 {
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229 PyObject *v = PyInt_FromLong((long) value);
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230 if (!v || PyDict_SetItemString(d, name, v))
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231 PyErr_Clear();
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232
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233 Py_XDECREF(v);
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234 }
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235
24471
f66b3a3509c7 Excise DL_EXPORT/DL_IMPORT from Modules/*. Required adding a prototype
Mark Hammond <mhammond@skippinet.com.au>
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236 PyMODINIT_FUNC
13651
8a063423e0b7 Bunch of minor ANSIfications: 'void initfunc()' -> 'void initfunc(void)',
Thomas Wouters <thomas@python.org>
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237 initdl(void)
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238 {
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239 PyObject *m, *d, *x;
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240
46840
b6b2cea5d306 Deprecate the dl module for removal in 3.0.
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241 if (PyErr_WarnPy3k("the dl module has been removed in "
46855
892f9b2959c9 Flesh out the 3.0 deprecation to suggest using the ctypes module.
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242 "Python 3.0; use the ctypes module instead", 2) < 0)
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243 return;
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244
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245 /* Initialize object type */
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246 Py_TYPE(&Dltype) = &PyType_Type;
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247
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248 /* Create the module and add the functions */
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249 m = Py_InitModule("dl", dl_methods);
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250 if (m == NULL)
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251 return;
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252
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253 /* Add some symbolic constants to the module */
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254 d = PyModule_GetDict(m);
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255 Dlerror = x = PyErr_NewException("dl.error", NULL, NULL);
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256 PyDict_SetItemString(d, "error", x);
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257 x = PyInt_FromLong((long)RTLD_LAZY);
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258 PyDict_SetItemString(d, "RTLD_LAZY", x);
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259 #define INSINT(X) insint(d,#X,X)
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260 #ifdef RTLD_NOW
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261 INSINT(RTLD_NOW);
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262 #endif
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263 #ifdef RTLD_NOLOAD
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264 INSINT(RTLD_NOLOAD);
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265 #endif
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266 #ifdef RTLD_GLOBAL
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267 INSINT(RTLD_GLOBAL);
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268 #endif
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269 #ifdef RTLD_LOCAL
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270 INSINT(RTLD_LOCAL);
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271 #endif
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272 #ifdef RTLD_PARENT
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273 INSINT(RTLD_PARENT);
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274 #endif
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275 #ifdef RTLD_GROUP
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276 INSINT(RTLD_GROUP);
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Martin v. Löwis <martin@v.loewis.de>
parents: 14375
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277 #endif
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
Martin v. Löwis <martin@v.loewis.de>
parents: 14375
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278 #ifdef RTLD_WORLD
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fd25030223b0 Untabify C files. Will watch buildbots.
Antoine Pitrou <solipsis@pitrou.net>
parents: 47967
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279 INSINT(RTLD_WORLD);
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a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
Martin v. Löwis <martin@v.loewis.de>
parents: 14375
diff changeset
280 #endif
a45ca1f7f241 Add several dl.RTLD_ constants. Closes bug 110842.
Martin v. Löwis <martin@v.loewis.de>
parents: 14375
diff changeset
281 #ifdef RTLD_NODELETE
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fd25030223b0 Untabify C files. Will watch buildbots.
Antoine Pitrou <solipsis@pitrou.net>
parents: 47967
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282 INSINT(RTLD_NODELETE);
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51a06fdfff78 Added some new modules
Guido van Rossum <guido@python.org>
parents:
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283 #endif
51a06fdfff78 Added some new modules
Guido van Rossum <guido@python.org>
parents:
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284 }