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(guile.info)Port Environment

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Port Environment
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 - primitive: current-input-port
     Returns the current input port.  This is the default port used by
     many input procedures.  Initially, `current-input-port' returns the
     value of `???'.

 - primitive: current-output-port
     Returns the current output port.  This is the default port used by
     many output procedures.  Initially, `current-output-port' returns
     the value of `???'.

 - primitive: current-error-port
     Return the port to which errors and warnings should be sent (the
     "standard error" in Unix and C terminology).

 - primitive: set-current-input-port port
 - primitive: set-current-output-port port
 - primitive: set-current-error-port port
     Change the ports returned by `current-input-port',
     `current-output-port' and `current-error-port', respectively, so
     that they use the supplied PORT for input or output.

 - primitive: set-current-output-port port
     Set the current default output port to PORT.

 - primitive: set-current-error-port port
     Set the current default error port to PORT.