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CentOS 7.0 - man page for is_term_resized (centos section 3X)

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resizeterm(3X)									   resizeterm(3X)

       is_term_resized, resize_term, resizeterm - change the curses terminal size

       #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 programs running in an X Window  ter-
       minal  (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 windows.  However,
       due  to	the  calling convention of pads, it is not possible to resize these without addi-
       tional interaction with the application.

       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 memory for the windows.

       While these functions are intended to be used to support a signal handler (i.e., for  SIG-
       WINCH),	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 system.  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 curses).

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