Mercurial > cpython-lru_cache-weakref

annotate Modules/spwdmodule.c @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 1b0ca1a7a3ca
children
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1
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2 /* UNIX shadow password file access module */
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3 /* A lot of code has been taken from pwdmodule.c */
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4 /* For info also see http://www.unixpapa.com/incnote/passwd.html */
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5
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6 #include "Python.h"
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7
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8 #include <sys/types.h>
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9 #ifdef HAVE_SHADOW_H
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10 #include <shadow.h>
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11 #endif
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12
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13
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14 PyDoc_STRVAR(spwd__doc__,
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15 "This module provides access to the Unix shadow password database.\n\
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16 It is available on various Unix versions.\n\
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17 \n\
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18 Shadow password database entries are reported as 9-tuples of type struct_spwd,\n\
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19 containing the following items from the password database (see `<shadow.h>'):\n\
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20 sp_namp, sp_pwdp, sp_lstchg, sp_min, sp_max, sp_warn, sp_inact, sp_expire, sp_flag.\n\
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21 The sp_namp and sp_pwdp are strings, the rest are integers.\n\
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22 An exception is raised if the entry asked for cannot be found.\n\
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23 You have to be root to be able to use this module.");
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24
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25
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26 #if defined(HAVE_GETSPNAM) || defined(HAVE_GETSPENT)
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27
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28 static PyStructSequence_Field struct_spwd_type_fields[] = {
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29 {"sp_namp", "login name"},
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30 {"sp_pwdp", "encrypted password"},
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31 {"sp_lstchg", "date of last change"},
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32 {"sp_min", "min #days between changes"},
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33 {"sp_max", "max #days between changes"},
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34 {"sp_warn", "#days before pw expires to warn user about it"},
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35 {"sp_inact", "#days after pw expires until account is disabled"},
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36 {"sp_expire", "#days since 1970-01-01 when account expires"},
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37 {"sp_flag", "reserved"},
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38 {"sp_nam", "login name; deprecated"}, /* Backward compatibility */
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39 {"sp_pwd", "encrypted password; deprecated"}, /* Backward compatibility */
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40 {0}
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41 };
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42
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43 PyDoc_STRVAR(struct_spwd__doc__,
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44 "spwd.struct_spwd: Results from getsp*() routines.\n\n\
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45 This object may be accessed either as a 9-tuple of\n\
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46 (sp_namp,sp_pwdp,sp_lstchg,sp_min,sp_max,sp_warn,sp_inact,sp_expire,sp_flag)\n\
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47 or via the object attributes as named in the above tuple.");
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48
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49 static PyStructSequence_Desc struct_spwd_type_desc = {
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50 "spwd.struct_spwd",
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51 struct_spwd__doc__,
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52 struct_spwd_type_fields,
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53 9,
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54 };
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55
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56 static int initialized;
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57 static PyTypeObject StructSpwdType;
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58
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59
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60 static void
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61 sets(PyObject *v, int i, const char* val)
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62 {
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63 if (val) {
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64 PyObject *o = PyUnicode_DecodeFSDefault(val);
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65 PyStructSequence_SET_ITEM(v, i, o);
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66 } else {
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67 PyStructSequence_SET_ITEM(v, i, Py_None);
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68 Py_INCREF(Py_None);
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69 }
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70 }
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71
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72 static PyObject *mkspent(struct spwd *p)
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73 {
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74 int setIndex = 0;
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75 PyObject *v = PyStructSequence_New(&StructSpwdType);
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76 if (v == NULL)
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77 return NULL;
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78
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79 #define SETI(i,val) PyStructSequence_SET_ITEM(v, i, PyLong_FromLong((long) val))
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80 #define SETS(i,val) sets(v, i, val)
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81
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82 SETS(setIndex++, p->sp_namp);
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83 SETS(setIndex++, p->sp_pwdp);
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84 SETI(setIndex++, p->sp_lstchg);
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85 SETI(setIndex++, p->sp_min);
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86 SETI(setIndex++, p->sp_max);
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87 SETI(setIndex++, p->sp_warn);
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88 SETI(setIndex++, p->sp_inact);
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89 SETI(setIndex++, p->sp_expire);
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90 SETI(setIndex++, p->sp_flag);
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91 SETS(setIndex++, p->sp_namp); /* Backward compatibility for sp_nam */
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92 SETS(setIndex++, p->sp_pwdp); /* Backward compatibility for sp_pwd */
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93
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94 #undef SETS
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95 #undef SETI
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96
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97 if (PyErr_Occurred()) {
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98 Py_DECREF(v);
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99 return NULL;
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100 }
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101
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102 return v;
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103 }
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104
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105 #endif /* HAVE_GETSPNAM || HAVE_GETSPENT */
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106
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107
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108 #ifdef HAVE_GETSPNAM
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109
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110 PyDoc_STRVAR(spwd_getspnam__doc__,
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111 "getspnam(name) -> (sp_namp, sp_pwdp, sp_lstchg, sp_min, sp_max,\n\
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112 sp_warn, sp_inact, sp_expire, sp_flag)\n\
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113 Return the shadow password database entry for the given user name.\n\
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114 See spwd.__doc__ for more on shadow password database entries.");
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115
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116 static PyObject* spwd_getspnam(PyObject *self, PyObject *args)
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117 {
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118 char *name;
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119 struct spwd *p;
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120 PyObject *arg, *bytes, *retval = NULL;
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121
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122 if (!PyArg_ParseTuple(args, "U:getspnam", &arg))
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123 return NULL;
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124 if ((bytes = PyUnicode_EncodeFSDefault(arg)) == NULL)
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125 return NULL;
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126 if (PyBytes_AsStringAndSize(bytes, &name, NULL) == -1)
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127 goto out;
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128 if ((p = getspnam(name)) == NULL) {
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129 PyErr_SetString(PyExc_KeyError, "getspnam(): name not found");
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130 goto out;
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131 }
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132 retval = mkspent(p);
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133 out:
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134 Py_DECREF(bytes);
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135 return retval;
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136 }
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137
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138 #endif /* HAVE_GETSPNAM */
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139
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140 #ifdef HAVE_GETSPENT
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141
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142 PyDoc_STRVAR(spwd_getspall__doc__,
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143 "getspall() -> list_of_entries\n\
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144 Return a list of all available shadow password database entries, \
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145 in arbitrary order.\n\
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146 See spwd.__doc__ for more on shadow password database entries.");
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147
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148 static PyObject *
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149 spwd_getspall(PyObject *self, PyObject *args)
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150 {
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151 PyObject *d;
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152 struct spwd *p;
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153 if ((d = PyList_New(0)) == NULL)
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154 return NULL;
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155 setspent();
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156 while ((p = getspent()) != NULL) {
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157 PyObject *v = mkspent(p);
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158 if (v == NULL || PyList_Append(d, v) != 0) {
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159 Py_XDECREF(v);
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160 Py_DECREF(d);
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161 endspent();
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162 return NULL;
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163 }
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164 Py_DECREF(v);
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165 }
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166 endspent();
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167 return d;
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168 }
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169
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170 #endif /* HAVE_GETSPENT */
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171
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172 static PyMethodDef spwd_methods[] = {
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173 #ifdef HAVE_GETSPNAM
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174 {"getspnam", spwd_getspnam, METH_VARARGS, spwd_getspnam__doc__},
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175 #endif
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176 #ifdef HAVE_GETSPENT
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177 {"getspall", spwd_getspall, METH_NOARGS, spwd_getspall__doc__},
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178 #endif
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179 {NULL, NULL} /* sentinel */
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180 };
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181
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182
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183
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184 static struct PyModuleDef spwdmodule = {
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185 PyModuleDef_HEAD_INIT,
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186 "spwd",
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187 spwd__doc__,
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188 -1,
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189 spwd_methods,
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190 NULL,
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191 NULL,
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192 NULL,
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193 NULL
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194 };
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195
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196 PyMODINIT_FUNC
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197 PyInit_spwd(void)
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198 {
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199 PyObject *m;
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200 m=PyModule_Create(&spwdmodule);
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201 if (m == NULL)
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202 return NULL;
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203 if (!initialized) {
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204 if (PyStructSequence_InitType2(&StructSpwdType,
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205 &struct_spwd_type_desc) < 0)
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206 return NULL;
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207 }
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208 Py_INCREF((PyObject *) &StructSpwdType);
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209 PyModule_AddObject(m, "struct_spwd", (PyObject *) &StructSpwdType);
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210 initialized = 1;
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211 return m;
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212 }