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annotate Modules/socketmodule.h @ 68237:364638d6434d 2.3

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Close 2.3 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:55:46 +0100
parents ac487a7f7f2c
children 493707692671
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1 /* Socket module header file */
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2
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3 /* Includes needed for the sockaddr_* symbols below */
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4 #ifndef MS_WINDOWS
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5 #ifdef __VMS
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6 # include <socket.h>
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7 # else
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8 # include <sys/socket.h>
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9 # endif
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10 # include <netinet/in.h>
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11 # if !(defined(__BEOS__) || defined(__CYGWIN__) || (defined(PYOS_OS2) && defined(PYCC_VACPP)))
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12 # include <netinet/tcp.h>
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13 # endif
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14
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15 #else /* MS_WINDOWS */
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16 #if _MSC_VER >= 1300
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17 # include <winsock2.h>
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18 # include <ws2tcpip.h>
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19 # define HAVE_ADDRINFO
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20 # define HAVE_SOCKADDR_STORAGE
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21 # define HAVE_GETADDRINFO
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22 # define HAVE_GETNAMEINFO
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23 # define ENABLE_IPV6
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24 #else
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25 # include <winsock.h>
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26 #endif
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27 #endif
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28
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29 #ifdef HAVE_SYS_UN_H
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30 # include <sys/un.h>
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31 #else
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32 # undef AF_UNIX
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33 #endif
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34
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35 #ifdef HAVE_NETPACKET_PACKET_H
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36 # include <sys/ioctl.h>
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37 # include <net/if.h>
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38 # include <netpacket/packet.h>
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39 #endif
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40
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41 #ifndef Py__SOCKET_H
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42 #define Py__SOCKET_H
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43 #ifdef __cplusplus
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44 extern "C" {
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45 #endif
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46
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47 /* Python module and C API name */
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48 #define PySocket_MODULE_NAME "_socket"
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49 #define PySocket_CAPI_NAME "CAPI"
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50
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51 /* Abstract the socket file descriptor type */
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52 #ifdef MS_WINDOWS
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53 typedef SOCKET SOCKET_T;
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54 # ifdef MS_WIN64
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55 # define SIZEOF_SOCKET_T 8
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56 # else
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57 # define SIZEOF_SOCKET_T 4
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58 # endif
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59 #else
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60 typedef int SOCKET_T;
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61 # define SIZEOF_SOCKET_T SIZEOF_INT
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62 #endif
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63
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64 /* The object holding a socket. It holds some extra information,
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65 like the address family, which is used to decode socket address
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66 arguments properly. */
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67
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68 typedef struct {
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69 PyObject_HEAD
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70 SOCKET_T sock_fd; /* Socket file descriptor */
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71 int sock_family; /* Address family, e.g., AF_INET */
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72 int sock_type; /* Socket type, e.g., SOCK_STREAM */
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73 int sock_proto; /* Protocol type, usually 0 */
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74 union sock_addr {
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75 struct sockaddr_in in;
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76 #ifdef AF_UNIX
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77 struct sockaddr_un un;
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78 #endif
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79 #ifdef ENABLE_IPV6
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80 struct sockaddr_in6 in6;
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81 struct sockaddr_storage storage;
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82 #endif
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83 #ifdef HAVE_NETPACKET_PACKET_H
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84 struct sockaddr_ll ll;
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85 #endif
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86 } sock_addr;
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87 PyObject *(*errorhandler)(void); /* Error handler; checks
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88 errno, returns NULL and
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89 sets a Python exception */
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90 double sock_timeout; /* Operation timeout in seconds;
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91 0.0 means non-blocking */
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92 } PySocketSockObject;
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93
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94 /* --- C API ----------------------------------------------------*/
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95
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96 /* Short explanation of what this C API export mechanism does
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97 and how it works:
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98
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99 The _ssl module needs access to the type object defined in
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100 the _socket module. Since cross-DLL linking introduces a lot of
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101 problems on many platforms, the "trick" is to wrap the
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102 C API of a module in a struct which then gets exported to
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103 other modules via a PyCObject.
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104
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105 The code in socketmodule.c defines this struct (which currently
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106 only contains the type object reference, but could very
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107 well also include other C APIs needed by other modules)
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108 and exports it as PyCObject via the module dictionary
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109 under the name "CAPI".
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110
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111 Other modules can now include the socketmodule.h file
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112 which defines the needed C APIs to import and set up
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113 a static copy of this struct in the importing module.
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114
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115 After initialization, the importing module can then
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116 access the C APIs from the _socket module by simply
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117 referring to the static struct, e.g.
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118
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119 Load _socket module and its C API; this sets up the global
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120 PySocketModule:
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121
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122 if (PySocketModule_ImportModuleAndAPI())
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123 return;
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124
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125
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126 Now use the C API as if it were defined in the using
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127 module:
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128
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129 if (!PyArg_ParseTuple(args, "O!|zz:ssl",
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130
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131 PySocketModule.Sock_Type,
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132
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133 (PyObject*)&Sock,
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134 &key_file, &cert_file))
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135 return NULL;
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136
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137 Support could easily be extended to export more C APIs/symbols
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138 this way. Currently, only the type object is exported,
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139 other candidates would be socket constructors and socket
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140 access functions.
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141
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142 */
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143
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144 /* C API for usage by other Python modules */
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145 typedef struct {
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146 PyTypeObject *Sock_Type;
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147 } PySocketModule_APIObject;
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148
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149 /* XXX The net effect of the following appears to be to define a function
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150 XXX named PySocketModule_APIObject in _ssl.c. It's unclear why it isn't
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151 XXX defined there directly.
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152
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153 >>> It's defined here because other modules might also want to use
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154 >>> the C API.
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155
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156 */
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157 #ifndef PySocket_BUILDING_SOCKET
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158
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159 /* --- C API ----------------------------------------------------*/
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160
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161 /* Interfacestructure to C API for other modules.
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162 Call PySocketModule_ImportModuleAndAPI() to initialize this
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163 structure. After that usage is simple:
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164
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165 if (!PyArg_ParseTuple(args, "O!|zz:ssl",
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166 &PySocketModule.Sock_Type, (PyObject*)&Sock,
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167 &key_file, &cert_file))
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168 return NULL;
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169 ...
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170 */
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171
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172 static
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173 PySocketModule_APIObject PySocketModule;
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174
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175 /* You *must* call this before using any of the functions in
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176 PySocketModule and check its outcome; otherwise all accesses will
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177 result in a segfault. Returns 0 on success. */
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178
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179 #ifndef DPRINTF
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180 # define DPRINTF if (0) printf
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181 #endif
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182
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183 static
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184 int PySocketModule_ImportModuleAndAPI(void)
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185 {
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186 PyObject *mod = 0, *v = 0;
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187 char *apimodule = PySocket_MODULE_NAME;
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188 char *apiname = PySocket_CAPI_NAME;
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189 void *api;
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190
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191 DPRINTF("Importing the %s C API...\n", apimodule);
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192 mod = PyImport_ImportModule(apimodule);
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193 if (mod == NULL)
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194 goto onError;
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195 DPRINTF(" %s package found\n", apimodule);
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196 v = PyObject_GetAttrString(mod, apiname);
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197 if (v == NULL)
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198 goto onError;
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199 Py_DECREF(mod);
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200 DPRINTF(" API object %s found\n", apiname);
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201 api = PyCObject_AsVoidPtr(v);
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202 if (api == NULL)
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203 goto onError;
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204 Py_DECREF(v);
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205 memcpy(&PySocketModule, api, sizeof(PySocketModule));
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206 DPRINTF(" API object loaded and initialized.\n");
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207 return 0;
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208
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209 onError:
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210 DPRINTF(" not found.\n");
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211 Py_XDECREF(mod);
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212 Py_XDECREF(v);
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213 return -1;
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214 }
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215
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216 #endif /* !PySocket_BUILDING_SOCKET */
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217
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218 #ifdef __cplusplus
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219 }
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220 #endif
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221 #endif /* !Py__SOCKET_H */