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182 lines
6.2 KiB
TeX
182 lines
6.2 KiB
TeX
\section{\module{mactcp} ---
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The MacTCP interfaces.}
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\declaremodule{builtin}{mactcp}
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\modulesynopsis{The MacTCP interfaces.}
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This module provides an interface to the Macintosh TCP/IP driver%
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\index{MacTCP} MacTCP. There is an accompanying module,
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\module{macdnr}\refbimodindex{macdnr}, which provides an interface to
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the name-server (allowing you to translate hostnames to IP addresses),
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a module \module{MACTCPconst}\refstmodindex{MACTCPconst} which has
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symbolic names for constants constants used by MacTCP. Since the
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built-in module \module{socket} is also available on the Macintosh it
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is usually easier to use sockets instead of the Macintosh-specific
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MacTCP API.
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A complete description of the MacTCP interface can be found in the
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Apple MacTCP API documentation.
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\begin{funcdesc}{MTU}{}
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Return the Maximum Transmit Unit (the packet size) of the network
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interface.\index{Maximum Transmit Unit}
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\end{funcdesc}
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\begin{funcdesc}{IPAddr}{}
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Return the 32-bit integer IP address of the network interface.
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\end{funcdesc}
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\begin{funcdesc}{NetMask}{}
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Return the 32-bit integer network mask of the interface.
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\end{funcdesc}
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\begin{funcdesc}{TCPCreate}{size}
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Create a TCP Stream object. \var{size} is the size of the receive
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buffer, \code{4096} is suggested by various sources.
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\end{funcdesc}
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\begin{funcdesc}{UDPCreate}{size, port}
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Create a UDP Stream object. \var{size} is the size of the receive
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buffer (and, hence, the size of the biggest datagram you can receive
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on this port). \var{port} is the UDP port number you want to receive
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datagrams on, a value of zero will make MacTCP select a free port.
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\end{funcdesc}
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\subsection{TCP Stream Objects}
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\begin{memberdesc}[TCP Stream]{asr}
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\index{asynchronous service routine}
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\index{service routine, asynchronous}
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When set to a value different than \code{None} this should refer to a
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function with two integer parameters:\ an event code and a detail. This
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function will be called upon network-generated events such as urgent
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data arrival. Macintosh documentation calls this the
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\dfn{asynchronous service routine}. In addition, it is called with
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eventcode \code{MACTCP.PassiveOpenDone} when a \code{PassiveOpen}
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completes. This is a Python addition to the MacTCP semantics.
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It is safe to do further calls from \var{asr}.
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\end{memberdesc}
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\begin{methoddesc}[TCP Stream]{PassiveOpen}{port}
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Wait for an incoming connection on TCP port \var{port} (zero makes the
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system pick a free port). The call returns immediately, and you should
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use \method{wait()} to wait for completion. You should not issue any method
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calls other than \method{wait()}, \method{isdone()} or
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\method{GetSockName()} before the call completes.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{wait}{}
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Wait for \code{PassiveOpen} to complete.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{isdone}{}
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Return \code{1} if a \code{PassiveOpen} has completed.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{GetSockName}{}
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Return the TCP address of this side of a connection as a 2-tuple
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\code{(\var{host}, \var{port})}, both integers.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{ActiveOpen}{lport, host, rport}
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Open an outgoing connection to TCP address \code{(\var{host},
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\var{rport})}. Use
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local port \var{lport} (zero makes the system pick a free port). This
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call blocks until the connection has been established.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{Send}{buf, push, urgent}
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Send data \var{buf} over the connection. \var{push} and \var{urgent}
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are flags as specified by the TCP standard.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{Rcv}{timeout}
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Receive data. The call returns when \var{timeout} seconds have passed
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or when (according to the MacTCP documentation) ``a reasonable amount
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of data has been received''. The return value is a 3-tuple
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\code{(\var{data}, \var{urgent}, \var{mark})}. If urgent data is
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outstanding \code{Rcv} will always return that before looking at any
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normal data. The first call returning urgent data will have the
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\var{urgent} flag set, the last will have the \var{mark} flag set.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{Close}{}
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Tell MacTCP that no more data will be transmitted on this
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connection. The call returns when all data has been acknowledged by
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the receiving side.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{Abort}{}
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Forcibly close both sides of a connection, ignoring outstanding data.
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\end{methoddesc}
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\begin{methoddesc}[TCP Stream]{Status}{}
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Return a TCP status object for this stream giving the current status
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(see below).
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\end{methoddesc}
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\subsection{TCP Status Objects}
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This object has no methods, only some members holding information on
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the connection. A complete description of all fields in this objects
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can be found in the Apple documentation. The most interesting ones are:
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\begin{memberdesc}[TCP Status]{localHost}
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\memberline{localPort}
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\memberline{remoteHost}
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\memberline{remotePort}
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The integer IP-addresses and port numbers of both endpoints of the
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connection.
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\end{memberdesc}
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\begin{memberdesc}[TCP Status]{sendWindow}
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The current window size.
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\end{memberdesc}
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\begin{memberdesc}[TCP Status]{amtUnackedData}
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The number of bytes sent but not yet acknowledged. \code{sendWindow -
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amtUnackedData} is what you can pass to \method{Send()} without
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blocking.
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\end{memberdesc}
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\begin{memberdesc}[TCP Status]{amtUnreadData}
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The number of bytes received but not yet read (what you can
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\method{Recv()} without blocking).
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\end{memberdesc}
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\subsection{UDP Stream Objects}
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Note that, unlike the name suggests, there is nothing stream-like
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about UDP.
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\begin{memberdesc}[UDP Stream]{asr}
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\index{asynchronous service routine}
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\index{service routine, asynchronous}
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The asynchronous service routine to be called on events such as
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datagram arrival without outstanding \code{Read} call. The \var{asr}
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has a single argument, the event code.
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\end{memberdesc}
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\begin{memberdesc}[UDP Stream]{port}
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A read-only member giving the port number of this UDP Stream.
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\end{memberdesc}
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\begin{methoddesc}[UDP Stream]{Read}{timeout}
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Read a datagram, waiting at most \var{timeout} seconds (-1 is
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infinite). Return the data.
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\end{methoddesc}
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\begin{methoddesc}[UDP Stream]{Write}{host, port, buf}
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Send \var{buf} as a datagram to IP-address \var{host}, port
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\var{port}.
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\end{methoddesc}
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