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author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
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1 \section{Built-in Module \sectcode{mactcp}}
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2 \bimodindex{mactcp}
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3
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4 \renewcommand{\indexsubitem}{(in module mactcp)}
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5
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6 This module provides an interface to the Macintosh TCP/IP driver
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7 MacTCP\@. There is an accompanying module \code{macdnr} which provides an
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8 interface to the name-server (allowing you to translate hostnames to
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9 ip-addresses), a module \code{MACTCPconst} which has symbolic names for
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10 constants constants used by MacTCP. Since the builtin module
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11 \code{socket} is also available on the mac it is usually easier to use
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12 sockets in stead of the mac-specific MacTCP API.
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13
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14 A complete description of the MacTCP interface can be found in the
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15 Apple MacTCP API documentation.
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16
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17 \begin{funcdesc}{MTU}{}
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18 Return the Maximum Transmit Unit (the packet size) of the network
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19 interface.
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20 \end{funcdesc}
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21
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22 \begin{funcdesc}{IPAddr}{}
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23 Return the 32-bit integer IP address of the network interface.
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24 \end{funcdesc}
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26 \begin{funcdesc}{NetMask}{}
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27 Return the 32-bit integer network mask of the interface.
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28 \end{funcdesc}
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29
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30 \begin{funcdesc}{TCPCreate}{size}
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31 Create a TCP Stream object. \var{size} is the size of the receive
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32 buffer, \code{4096} is suggested by various sources.
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33 \end{funcdesc}
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35 \begin{funcdesc}{UDPCreate}{size, port}
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36 Create a UDP stream object. \var{size} is the size of the receive
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37 buffer (and, hence, the size of the biggest datagram you can receive
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38 on this port). \var{port} is the UDP port number you want to receive
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39 datagrams on, a value of zero will make MacTCP select a free port.
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40 \end{funcdesc}
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41
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42 \subsection{TCP Stream Objects}
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43
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44 \renewcommand{\indexsubitem}{(TCP stream attribute)}
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45
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46 \begin{datadesc}{asr}
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47 When set to a value different than \code{None} this should point to a
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48 function with two integer parameters:\ an event code and a detail. This
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49 function will be called upon network-generated events such as urgent
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50 data arrival. In addition, it is called with eventcode
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51 \code{MACTCP.PassiveOpenDone} when a \code{PassiveOpen} completes. This
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52 is a Python addition to the MacTCP semantics.
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53 It is safe to do further calls from the \code{asr}.
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54 \end{datadesc}
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55
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56 \renewcommand{\indexsubitem}{(TCP stream method)}
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57
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58 \begin{funcdesc}{PassiveOpen}{port}
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59 Wait for an incoming connection on TCP port \var{port} (zero makes the
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60 system pick a free port). The call returns immediately, and you should
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61 use \var{wait} to wait for completion. You should not issue any method
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62 calls other than
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63 \code{wait}, \code{isdone} or \code{GetSockName} before the call
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64 completes.
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65 \end{funcdesc}
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66
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67 \begin{funcdesc}{wait}{}
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68 Wait for \code{PassiveOpen} to complete.
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69 \end{funcdesc}
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70
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71 \begin{funcdesc}{isdone}{}
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72 Return 1 if a \code{PassiveOpen} has completed.
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73 \end{funcdesc}
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74
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75 \begin{funcdesc}{GetSockName}{}
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76 Return the TCP address of this side of a connection as a 2-tuple
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77 \code{(host, port)}, both integers.
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78 \end{funcdesc}
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79
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80 \begin{funcdesc}{ActiveOpen}{lport\, host\, rport}
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81 Open an outgoing connection to TCP address \code{(\var{host}, \var{rport})}. Use
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82 local port \var{lport} (zero makes the system pick a free port). This
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83 call blocks until the connection has been established.
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84 \end{funcdesc}
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85
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86 \begin{funcdesc}{Send}{buf\, push\, urgent}
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87 Send data \var{buf} over the connection. \var{Push} and \var{urgent}
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88 are flags as specified by the TCP standard.
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89 \end{funcdesc}
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90
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91 \begin{funcdesc}{Rcv}{timeout}
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92 Receive data. The call returns when \var{timeout} seconds have passed
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93 or when (according to the MacTCP documentation) ``a reasonable amount
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94 of data has been received''. The return value is a 3-tuple
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95 \code{(\var{data}, \var{urgent}, \var{mark})}. If urgent data is outstanding \code{Rcv}
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96 will always return that before looking at any normal data. The first
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97 call returning urgent data will have the \var{urgent} flag set, the
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98 last will have the \var{mark} flag set.
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99 \end{funcdesc}
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100
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101 \begin{funcdesc}{Close}{}
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102 Tell MacTCP that no more data will be transmitted on this
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103 connection. The call returns when all data has been acknowledged by
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104 the receiving side.
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105 \end{funcdesc}
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106
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107 \begin{funcdesc}{Abort}{}
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108 Forcibly close both sides of a connection, ignoring outstanding data.
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109 \end{funcdesc}
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110
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111 \begin{funcdesc}{Status}{}
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112 Return a TCP status object for this stream giving the current status
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113 (see below).
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114 \end{funcdesc}
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115
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116 \subsection{TCP Status Objects}
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117 This object has no methods, only some members holding information on
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118 the connection. A complete description of all fields in this objects
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119 can be found in the Apple documentation. The most interesting ones are:
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120
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121 \renewcommand{\indexsubitem}{(TCP status attribute)}
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122
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123 \begin{datadesc}{localHost}
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124 \dataline{localPort}
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125 \dataline{remoteHost}
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126 \dataline{remotePort}
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127 The integer IP-addresses and port numbers of both endpoints of the
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128 connection.
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129 \end{datadesc}
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130
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131 \begin{datadesc}{sendWindow}
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132 The current window size.
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133 \end{datadesc}
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134
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135 \begin{datadesc}{amtUnackedData}
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136 The number of bytes sent but not yet acknowledged. \code{sendWindow -
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137 amtUnackedData} is what you can pass to \code{Send} without blocking.
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138 \end{datadesc}
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139
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140 \begin{datadesc}{amtUnreadData}
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141 The number of bytes received but not yet read (what you can \code{Recv}
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142 without blocking).
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143 \end{datadesc}
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144
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145
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146
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147 \subsection{UDP Stream Objects}
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148 Note that, unlike the name suggests, there is nothing stream-like
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149 about UDP.
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150
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151 \renewcommand{\indexsubitem}{(UDP stream attribute)}
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152
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153 \begin{datadesc}{asr}
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154 The asynchronous service routine to be called on events such as
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155 datagram arrival without outstanding \code{Read} call. The \code{asr} has a
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156 single argument, the event code.
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157 \end{datadesc}
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158
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159 \begin{datadesc}{port}
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160 A read-only member giving the port number of this UDP stream.
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161 \end{datadesc}
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162
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163 \renewcommand{\indexsubitem}{(UDP stream method)}
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164
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165 \begin{funcdesc}{Read}{timeout}
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166 Read a datagram, waiting at most \var{timeout} seconds ($-1$ is
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167 infinite). Return the data.
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168 \end{funcdesc}
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169
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170 \begin{funcdesc}{Write}{host\, port\, buf}
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171 Send \var{buf} as a datagram to IP-address \var{host}, port
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172 \var{port}.
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173 \end{funcdesc}