Mercurial > cpython-lru_cache-weakref

annotate Modules/dlmodule.c @ 6719:faebc1940432 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Tue, 02 Dec 1997 20:38:11 +0000
parents 2c29b8982643
children c7bab73e63c6
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* dl module */
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33
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34 #include "Python.h"
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35
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36 #include <dlfcn.h>
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37
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38 #ifndef RTLD_LAZY
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39 #define RTLD_LAZY 1
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40 #endif
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41
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42 typedef ANY *PyUnivPtr;
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43 typedef struct {
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44 PyObject_HEAD
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45 PyUnivPtr *dl_handle;
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46 } dlobject;
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47
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48 staticforward PyTypeObject Dltype;
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49
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50 static PyObject *Dlerror;
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51
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52 static PyObject *
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53 newdlobject(handle)
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54 PyUnivPtr *handle;
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55 {
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56 dlobject *xp;
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57 xp = PyObject_NEW(dlobject, &Dltype);
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58 if (xp == NULL)
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59 return NULL;
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60 xp->dl_handle = handle;
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61 return (PyObject *)xp;
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62 }
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63
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64 static void
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65 dl_dealloc(xp)
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66 dlobject *xp;
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67 {
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68 if (xp->dl_handle != NULL)
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69 dlclose(xp->dl_handle);
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70 PyMem_DEL(xp);
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71 }
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72
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73 static PyObject *
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74 dl_close(xp, args)
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75 dlobject *xp;
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76 PyObject *args;
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77 {
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78 if (!PyArg_Parse(args, ""))
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79 return NULL;
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80 if (xp->dl_handle != NULL) {
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81 dlclose(xp->dl_handle);
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82 xp->dl_handle = NULL;
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83 }
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84 Py_INCREF(Py_None);
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85 return Py_None;
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86 }
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87
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88 static PyObject *
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89 dl_sym(xp, args)
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90 dlobject *xp;
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91 PyObject *args;
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92 {
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93 char *name;
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94 PyUnivPtr *func;
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95 if (!PyArg_Parse(args, "s", &name))
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96 return NULL;
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97 func = dlsym(xp->dl_handle, name);
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98 if (func == NULL) {
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99 Py_INCREF(Py_None);
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100 return Py_None;
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101 }
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102 return PyInt_FromLong((long)func);
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103 }
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104
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105 static PyObject *
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106 dl_call(xp, args)
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107 dlobject *xp;
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108 PyObject *args; /* (varargs) */
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109 {
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110 PyObject *name;
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111 long (*func)();
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112 long alist[10];
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113 long res;
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114 int i;
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115 int n = PyTuple_Size(args);
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116 if (n < 1) {
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117 PyErr_SetString(PyExc_TypeError, "at least a name is needed");
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118 return NULL;
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119 }
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120 name = PyTuple_GetItem(args, 0);
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121 if (!PyString_Check(name)) {
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122 PyErr_SetString(PyExc_TypeError,
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123 "function name must be a string");
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124 return NULL;
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125 }
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126 func = dlsym(xp->dl_handle, PyString_AsString(name));
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127 if (func == NULL) {
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128 PyErr_SetString(PyExc_ValueError, dlerror());
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129 return NULL;
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130 }
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131 if (n-1 > 10) {
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132 PyErr_SetString(PyExc_TypeError,
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133 "too many arguments (max 10)");
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134 return NULL;
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135 }
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136 for (i = 1; i < n; i++) {
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137 PyObject *v = PyTuple_GetItem(args, i);
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138 if (PyInt_Check(v))
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139 alist[i-1] = PyInt_AsLong(v);
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140 else if (PyString_Check(v))
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141 alist[i-1] = (long)PyString_AsString(v);
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142 else if (v == Py_None)
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143 alist[i-1] = (long) ((char *)NULL);
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144 else {
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145 PyErr_SetString(PyExc_TypeError,
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146 "arguments must be int, string or None");
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147 return NULL;
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148 }
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149 }
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150 for (; i <= 10; i++)
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151 alist[i-1] = 0;
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152 res = (*func)(alist[0], alist[1], alist[2], alist[3], alist[4],
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153 alist[5], alist[6], alist[7], alist[8], alist[9]);
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154 return PyInt_FromLong(res);
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155 }
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156
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157 static PyMethodDef dlobject_methods[] = {
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158 {"call", (PyCFunction)dl_call, 1 /* varargs */},
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159 {"sym", (PyCFunction)dl_sym},
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160 {"close", (PyCFunction)dl_close},
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161 {NULL, NULL} /* Sentinel */
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162 };
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163
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164 static PyObject *
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165 dl_getattr(xp, name)
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166 dlobject *xp;
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167 char *name;
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168 {
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169 return Py_FindMethod(dlobject_methods, (PyObject *)xp, name);
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170 }
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171
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172
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173 static PyTypeObject Dltype = {
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174 PyObject_HEAD_INIT(&PyType_Type)
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175 0, /*ob_size*/
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176 "dl", /*tp_name*/
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177 sizeof(dlobject), /*tp_basicsize*/
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178 0, /*tp_itemsize*/
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179 /* methods */
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180 (destructor)dl_dealloc, /*tp_dealloc*/
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181 0, /*tp_print*/
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182 (getattrfunc)dl_getattr,/*tp_getattr*/
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183 0, /*tp_setattr*/
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184 0, /*tp_compare*/
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185 0, /*tp_repr*/
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186 0, /*tp_as_number*/
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187 0, /*tp_as_sequence*/
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188 0, /*tp_as_mapping*/
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189 0, /*tp_hash*/
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190 };
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191
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192 static PyObject *
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193 dl_open(self, args)
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194 PyObject *self;
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195 PyObject *args;
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196 {
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197 char *name;
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198 int mode;
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199 PyUnivPtr *handle;
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200 if (PyArg_Parse(args, "z", &name))
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201 mode = RTLD_LAZY;
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202 else {
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203 PyErr_Clear();
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204 if (!PyArg_Parse(args, "(zi)", &name, &mode))
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205 return NULL;
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206 #ifndef RTLD_NOW
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207 if (mode != RTLD_LAZY) {
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208 PyErr_SetString(PyExc_ValueError, "mode must be 1");
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209 return NULL;
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210 }
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211 #endif
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212 }
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213 handle = dlopen(name, mode);
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214 if (handle == NULL) {
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215 PyErr_SetString(Dlerror, dlerror());
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216 return NULL;
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217 }
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218 return newdlobject(handle);
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219 }
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220
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221 static PyMethodDef dl_methods[] = {
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222 {"open", dl_open},
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223 {NULL, NULL} /* sentinel */
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224 };
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225
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226 void
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227 initdl()
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228 {
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229 PyObject *m, *d, *x;
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230
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231 if (sizeof(int) != sizeof(long) ||
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232 sizeof(long) != sizeof(char *)) {
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233 Py_Err_SetStr(
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234 "module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
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235 return;
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236 }
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237
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238 /* Create the module and add the functions */
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239 m = Py_InitModule("dl", dl_methods);
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240
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241 /* Add some symbolic constants to the module */
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242 d = PyModule_GetDict(m);
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243 Dlerror = x = PyErr_NewException("dl.error", NULL, NULL);
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244 PyDict_SetItemString(d, "error", x);
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245 x = PyInt_FromLong((long)RTLD_LAZY);
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246 PyDict_SetItemString(d, "RTLD_LAZY", x);
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247 #ifdef RTLD_NOW
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248 x = PyInt_FromLong((long)RTLD_NOW);
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249 PyDict_SetItemString(d, "RTLD_NOW", x);
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250 #endif
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251 }