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RedHat 9 (Linux i386) - man page for wtouchln (redhat section 3X)

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curs_touch(3X)									   curs_touch(3X)

       touchwin,  touchline, untouchwin, wtouchln, is_linetouched, is_wintouched - curses refresh
       control routines

       #include <curses.h>
       int touchwin(WINDOW *win);
       int touchline(WINDOW *win, int start, int count);
       int untouchwin(WINDOW *win);
       int wtouchln(WINDOW *win, int y, int n, int changed);
       bool is_linetouched(WINDOW *win, int line);
       bool is_wintouched(WINDOW *win);

       The touchwin and touchline routines throw away all optimization	information  about  which
       parts of the window have been touched, by pretending that the entire window has been drawn
       on.  This is sometimes necessary when using overlapping windows, since  a  change  to  one
       window  affects	the other window, but the records of which lines have been changed in the
       other window do not reflect the change.	The routine touchline only  pretends  that  count
       lines have been changed, beginning with line start.

       The  untouchwin	routine marks all lines in the window as unchanged since the last call to

       The wtouchln routine makes n lines in the window, starting at line y, look as if they have
       (changed=1) or have not (changed=0) been changed since the last call to wrefresh.

       The is_linetouched and is_wintouched routines return TRUE if the specified line/window was
       modified since the last call to wrefresh;  otherwise  they  return  FALSE.   In	addition,
       is_linetouched returns ERR if line is not valid for the given window.

       All  routines return the integer ERR upon failure and an integer value other than ERR upon
       successful completion, unless otherwise noted in the preceding routine descriptions.

       The XSI Curses standard, Issue 4 describes these functions.

       Some historic curses implementations had, as an undocumented feature, the  ability  to  do
       the  equivalent of clearok(..., 1) by saying touchwin(stdscr) or clear(stdscr).	This will
       not work under ncurses.

       Note that all routines except wtouchln may be macros.

       curses(3X), curs_refresh(3X).

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