resizeterm man page on Oracle

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resizeterm(3X)							resizeterm(3X)

       is_term_resized,	 resize_term,  resizeterm - change the curses terminal

       #include <curses.h>

       bool is_term_resized(int lines, int columns);
       int resize_term(int lines, int columns);
       int resizeterm(int lines, int columns);

       This is an extension to the curses library.  It provides callers with a
       hook into the ncurses data to resize windows, primarily for use by pro‐
       grams running in an X Window  terminal  (e.g.,  xterm).	 The  function
       resizeterm  resizes  the	 standard and current windows to the specified
       dimensions, and adjusts other bookkeeping  data	used  by  the  ncurses
       library that record the window dimensions.

       Most  of the work is done by the inner function resize_term.  The outer
       function resizeterm adds bookkeeping for the  SIGWINCH  handler.	  When
       resizing	 the  windows,	resize_term  blank-fills  the  areas  that are
       extended.  The calling application should  fill	in  these  areas  with
       appropriate data.  The resize_term function attempts to resize all win‐
       dows.  However, due to the calling convention of pads, it is not possi‐
       ble  to	resize	these without additional interaction with the applica‐

       A support function is_term_resized is provided so that applications can
       check  if  the resize_term function would modify the window structures.
       It returns TRUE if the windows would be modified, and FALSE otherwise.

       Except as notes, these function return the integer ERR upon failure and
       OK  on  success.	  They	will fail if either of the dimensions are less
       than or equal to zero, or if an error occurs while (re)allocating  mem‐
       ory for the windows.

       While  these functions are intended to be used to support a signal han‐
       dler (i.e., for SIGWINCH), care should be taken to avoid invoking  them
       in  a  context where malloc or realloc may have been interrupted, since
       it uses those functions.

       If ncurses is configured	 to  supply  its  own  SIGWINCH	 handler,  the
       resizeterm  function  ungetch's	a KEY_RESIZE which will be read on the
       next call to getch.  This is used to  alert  an	application  that  the
       screen  size  has  changed, and that it should repaint special features
       such as pads that cannot be done automatically.

       If the environment variables LINES or COLUMNS are set,  this  overrides
       the  library's  use of the window size obtained from the operating sys‐
       tem.  Thus, even if a SIGWINCH is received, no screen size  change  may
       be recorded.

       curs_variables(3X), wresize(3X).

       Thomas  Dickey  (from  an  equivalent  function written in 1988 for BSD


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