Module "Socket.curry"

Library to support network programming with sockets. In standard applications, the server side uses the operations listenOn and socketAccept to provide some service on a socket, and the client side uses the operation connectToSocket to request a service.

Author: Michael Hanus

Version: February 2008

Datatypes:
Socket

Functions:
connectToSocket | listenOn | listenOnFresh | sClose | socketAccept | waitForSocketAccept

listenOn  :: Int -> IO Socket              Creates a server side socket bound to a given port number.

listenOnFresh  :: IO (Int,Socket)              Creates a server side socket bound to a free port.

socketAccept  :: Socket -> IO (String,Handle)              Returns a connection of a client to a socket.

waitForSocketAccept  :: Socket -> Int -> IO (Maybe (String,Handle))              Waits until a connection of a client to a socket is available.

sClose  :: Socket -> IO ()              Closes a server socket.

connectToSocket  :: String -> Int -> IO Handle              Creates a new connection to a Unix socket.

Socket

The abstract type of sockets.

Constructors:

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Exported functions:

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listenOn :: Int -> IO Socket   

Creates a server side socket bound to a given port number.

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listenOnFresh :: IO (Int,Socket)   

Creates a server side socket bound to a free port. The port number and the socket is returned.

Further infos:

• externally defined

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socketAccept :: Socket -> IO (String,Handle)   

Returns a connection of a client to a socket. The connection is returned as a pair consisting of a string identifying the client (the format of this string is implementation-dependent) and a handle to a stream communication with the client. The handle is both readable and writable.

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waitForSocketAccept :: Socket -> Int -> IO (Maybe (String,Handle))   

Waits until a connection of a client to a socket is available. If no connection is available within the time limit, it returns Nothing, otherwise the connection is returned as a pair consisting of a string identifying the client (the format of this string is implementation-dependent) and a handle to a stream communication with the client.

Example call:  (waitForSocketAccept socket timeout)

Parameters:

socket - a socket

timeout - milliseconds to wait for input (< 0 : no time out)

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sClose :: Socket -> IO ()   

Closes a server socket.

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connectToSocket :: String -> Int -> IO Handle   

Creates a new connection to a Unix socket.

Example call:  (connectToSocket host port)

Parameters:

host - the host name of the connection

port - the port number of the connection

Returns:

the handle of the stream (connected to the port port@host) which is both readable and writable

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