Info Catalog elisp: Terminal Input elisp: System Interface elisp: Sound Output

elisp: Terminal Output

 
 38.14 Terminal Output
 =====================
 
 The terminal output functions send output to a text terminal, or keep
 track of output sent to the terminal.  The variable ‘baud-rate’ tells
 you what Emacs thinks is the output speed of the terminal.
 
  -- User Option: baud-rate
      This variable’s value is the output speed of the terminal, as far
      as Emacs knows.  Setting this variable does not change the speed of
      actual data transmission, but the value is used for calculations
      such as padding.
 
      It also affects decisions about whether to scroll part of the
      screen or repaint on text terminals.  Forcing Redisplay,
      for the corresponding functionality on graphical terminals.
 
      The value is measured in baud.
 
    If you are running across a network, and different parts of the
 network work at different baud rates, the value returned by Emacs may be
 different from the value used by your local terminal.  Some network
 protocols communicate the local terminal speed to the remote machine, so
 that Emacs and other programs can get the proper value, but others do
 not.  If Emacs has the wrong value, it makes decisions that are less
 than optimal.  To fix the problem, set ‘baud-rate’.
 
  -- Function: send-string-to-terminal string &optional terminal
      This function sends STRING to TERMINAL without alteration.  Control
      characters in STRING have terminal-dependent effects.  (If you need
      to display non-ASCII text on the terminal, encode it using one of
      the functions described in Explicit Encoding.)  This
      function operates only on text terminals.  TERMINAL may be a
      terminal object, a frame, or ‘nil’ for the selected frame’s
      terminal.  In batch mode, STRING is sent to ‘stdout’ when TERMINAL
      is ‘nil’.
 
      One use of this function is to define function keys on terminals
      that have downloadable function key definitions.  For example, this
      is how (on certain terminals) to define function key 4 to move
      forward four characters (by transmitting the characters ‘C-u C-f’
      to the computer):
 
           (send-string-to-terminal "\eF4\^U\^F")
                ⇒ nil
 
  -- Command: open-termscript filename
      This function is used to open a “termscript file” that will record
      all the characters sent by Emacs to the terminal.  It returns
      ‘nil’.  Termscript files are useful for investigating problems
      where Emacs garbles the screen, problems that are due to incorrect
      Termcap entries or to undesirable settings of terminal options more
      often than to actual Emacs bugs.  Once you are certain which
      characters were actually output, you can determine reliably whether
      they correspond to the Termcap specifications in use.
 
           (open-termscript "../junk/termscript")
                ⇒ nil
 
      You close the termscript file by calling this function with an
      argument of ‘nil’.
 
      See also ‘open-dribble-file’ in Recording Input.
 

Info Catalog elisp: Terminal Input elisp: System Interface elisp: Sound Output