(guile.info.gz) Default Ports

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 27.8 Default Ports for Input, Output and Errors
 ===============================================
 
  -- Scheme Procedure: current-input-port
  -- C Function: scm_current_input_port ()
      Return the current input port.  This is the default port used by
      many input procedures.  Initially, `current-input-port' returns
      the "standard input" in Unix and C terminology.
 
  -- Scheme Procedure: current-output-port
  -- C Function: scm_current_output_port ()
      Return the current output port.  This is the default port used by
      many output procedures.  Initially, `current-output-port' returns
      the "standard output" in Unix and C terminology.
 
  -- Scheme Procedure: current-error-port
  -- C Function: scm_current_error_port ()
      Return the port to which errors and warnings should be sent (the
      "standard error" in Unix and C terminology).
 
  -- Scheme Procedure: set-current-input-port port
  -- Scheme Procedure: set-current-output-port port
  -- Scheme Procedure: set-current-error-port port
  -- C Function: scm_set_current_input_port (port)
  -- C Function: scm_set_current_output_port (port)
  -- C Function: scm_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.
 
  -- Scheme Procedure: set-current-output-port port
      Set the current default output port to PORT.
 
  -- Scheme Procedure: set-current-error-port port
      Set the current default error port to PORT.
 

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