Mercurial > cpython-lru_cache-weakref

annotate Modules/socketmodule.h @ 43405:c19ec9515a33 legacy-trunk

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Annotated the correction to urllib.py, issue #1177
author Facundo Batista <facundobatista@gmail.com>
date Wed, 19 Sep 2007 14:02:03 +0000
parents 90e22fea8363
children 0cbe94bea2c7 a5e984eda45a
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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_LINUX_NETLINK_H
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36 # ifdef HAVE_ASM_TYPES_H
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37 # include <asm/types.h>
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38 # endif
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39 # include <linux/netlink.h>
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40 #else
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41 # undef AF_NETLINK
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42 #endif
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43
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44 #ifdef HAVE_BLUETOOTH_BLUETOOTH_H
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45 #include <bluetooth/bluetooth.h>
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46 #include <bluetooth/rfcomm.h>
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47 #include <bluetooth/l2cap.h>
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48 #include <bluetooth/sco.h>
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49 #include <bluetooth/hci.h>
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50 #endif
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51
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52 #ifdef HAVE_BLUETOOTH_H
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53 #include <bluetooth.h>
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54 #endif
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55
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56 #ifdef HAVE_NETPACKET_PACKET_H
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57 # include <sys/ioctl.h>
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58 # include <net/if.h>
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59 # include <netpacket/packet.h>
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60 #endif
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61
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62 #ifndef Py__SOCKET_H
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63 #define Py__SOCKET_H
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64 #ifdef __cplusplus
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65 extern "C" {
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66 #endif
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67
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68 /* Python module and C API name */
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69 #define PySocket_MODULE_NAME "_socket"
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70 #define PySocket_CAPI_NAME "CAPI"
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71
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72 /* Abstract the socket file descriptor type */
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73 #ifdef MS_WINDOWS
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74 typedef SOCKET SOCKET_T;
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75 # ifdef MS_WIN64
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76 # define SIZEOF_SOCKET_T 8
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77 # else
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78 # define SIZEOF_SOCKET_T 4
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79 # endif
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80 #else
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81 typedef int SOCKET_T;
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82 # define SIZEOF_SOCKET_T SIZEOF_INT
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83 #endif
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84
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85 /* Socket address */
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86 typedef union sock_addr {
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87 struct sockaddr_in in;
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88 #ifdef AF_UNIX
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89 struct sockaddr_un un;
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90 #endif
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91 #ifdef AF_NETLINK
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92 struct sockaddr_nl nl;
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93 #endif
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94 #ifdef ENABLE_IPV6
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95 struct sockaddr_in6 in6;
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96 struct sockaddr_storage storage;
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97 #endif
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98 #ifdef HAVE_BLUETOOTH_BLUETOOTH_H
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99 struct sockaddr_l2 bt_l2;
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100 struct sockaddr_rc bt_rc;
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101 struct sockaddr_sco bt_sco;
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102 struct sockaddr_hci bt_hci;
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103 #endif
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104 #ifdef HAVE_NETPACKET_PACKET_H
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105 struct sockaddr_ll ll;
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106 #endif
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107 } sock_addr_t;
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108
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109 /* The object holding a socket. It holds some extra information,
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110 like the address family, which is used to decode socket address
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111 arguments properly. */
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112
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113 typedef struct {
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114 PyObject_HEAD
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115 SOCKET_T sock_fd; /* Socket file descriptor */
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116 int sock_family; /* Address family, e.g., AF_INET */
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117 int sock_type; /* Socket type, e.g., SOCK_STREAM */
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118 int sock_proto; /* Protocol type, usually 0 */
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119 PyObject *(*errorhandler)(void); /* Error handler; checks
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120 errno, returns NULL and
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121 sets a Python exception */
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122 double sock_timeout; /* Operation timeout in seconds;
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123 0.0 means non-blocking */
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124 } PySocketSockObject;
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125
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126 /* --- C API ----------------------------------------------------*/
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127
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128 /* Short explanation of what this C API export mechanism does
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129 and how it works:
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130
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131 The _ssl module needs access to the type object defined in
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132 the _socket module. Since cross-DLL linking introduces a lot of
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133 problems on many platforms, the "trick" is to wrap the
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134 C API of a module in a struct which then gets exported to
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135 other modules via a PyCObject.
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136
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137 The code in socketmodule.c defines this struct (which currently
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138 only contains the type object reference, but could very
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139 well also include other C APIs needed by other modules)
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140 and exports it as PyCObject via the module dictionary
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141 under the name "CAPI".
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142
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143 Other modules can now include the socketmodule.h file
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144 which defines the needed C APIs to import and set up
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145 a static copy of this struct in the importing module.
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146
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147 After initialization, the importing module can then
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148 access the C APIs from the _socket module by simply
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149 referring to the static struct, e.g.
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150
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151 Load _socket module and its C API; this sets up the global
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152 PySocketModule:
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153
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154 if (PySocketModule_ImportModuleAndAPI())
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155 return;
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156
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157
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158 Now use the C API as if it were defined in the using
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159 module:
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160
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161 if (!PyArg_ParseTuple(args, "O!|zz:ssl",
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162
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163 PySocketModule.Sock_Type,
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164
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165 (PyObject*)&Sock,
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166 &key_file, &cert_file))
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167 return NULL;
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168
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169 Support could easily be extended to export more C APIs/symbols
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170 this way. Currently, only the type object is exported,
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171 other candidates would be socket constructors and socket
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172 access functions.
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173
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174 */
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175
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176 /* C API for usage by other Python modules */
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177 typedef struct {
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178 PyTypeObject *Sock_Type;
31790
29da8bdfeb4e Make socket.sslerror a subclass of socket.error .
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179 PyObject *error;
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180 } PySocketModule_APIObject;
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181
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182 /* XXX The net effect of the following appears to be to define a function
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183 XXX named PySocketModule_APIObject in _ssl.c. It's unclear why it isn't
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184 XXX defined there directly.
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185
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186 >>> It's defined here because other modules might also want to use
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187 >>> the C API.
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188
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189 */
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190 #ifndef PySocket_BUILDING_SOCKET
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191
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192 /* --- C API ----------------------------------------------------*/
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193
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194 /* Interfacestructure to C API for other modules.
23724
db239ec307e0 Repair a comment.
Guido van Rossum <guido@python.org>
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195 Call PySocketModule_ImportModuleAndAPI() to initialize this
21959
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196 structure. After that usage is simple:
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197
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198 if (!PyArg_ParseTuple(args, "O!|zz:ssl",
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199 &PySocketModule.Sock_Type, (PyObject*)&Sock,
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200 &key_file, &cert_file))
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201 return NULL;
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202 ...
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203 */
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204
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205 static
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206 PySocketModule_APIObject PySocketModule;
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207
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208 /* You *must* call this before using any of the functions in
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209 PySocketModule and check its outcome; otherwise all accesses will
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210 result in a segfault. Returns 0 on success. */
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211
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212 #ifndef DPRINTF
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213 # define DPRINTF if (0) printf
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214 #endif
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215
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216 static
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217 int PySocketModule_ImportModuleAndAPI(void)
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218 {
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219 PyObject *mod = 0, *v = 0;
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220 char *apimodule = PySocket_MODULE_NAME;
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221 char *apiname = PySocket_CAPI_NAME;
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222 void *api;
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223
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224 DPRINTF("Importing the %s C API...\n", apimodule);
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225 mod = PyImport_ImportModule(apimodule);
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226 if (mod == NULL)
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227 goto onError;
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228 DPRINTF(" %s package found\n", apimodule);
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229 v = PyObject_GetAttrString(mod, apiname);
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230 if (v == NULL)
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231 goto onError;
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232 Py_DECREF(mod);
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233 DPRINTF(" API object %s found\n", apiname);
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234 api = PyCObject_AsVoidPtr(v);
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235 if (api == NULL)
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236 goto onError;
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237 Py_DECREF(v);
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238 memcpy(&PySocketModule, api, sizeof(PySocketModule));
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239 DPRINTF(" API object loaded and initialized.\n");
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240 return 0;
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241
21959
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242 onError:
21969
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243 DPRINTF(" not found.\n");
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244 Py_XDECREF(mod);
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245 Py_XDECREF(v);
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246 return -1;
21959
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247 }
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248
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249 #endif /* !PySocket_BUILDING_SOCKET */
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250
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251 #ifdef __cplusplus
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252 }
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253 #endif
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254 #endif /* !Py__SOCKET_H */