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

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curs_kernel(3X) 								  curs_kernel(3X)

       def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode, resetty, savetty,
       getsyx, setsyx, ripoffline, curs_set, napms - low-level curses routines

       #include <curses.h>

       int def_prog_mode(void);
       int def_shell_mode(void);
       int reset_prog_mode(void);
       int reset_shell_mode(void);
       int resetty(void);
       int savetty(void);
       void getsyx(int y, int x);
       void setsyx(int y, int x);
       int ripoffline(int line, int (*init)(WINDOW *, int));
       int curs_set(int visibility);
       int napms(int ms);

       The following routines give low-level access to various curses capabilities.   These  rou-
       tines typically are used inside library routines.

       The def_prog_mode and def_shell_mode routines save the current terminal modes as the "pro-
       gram" (in curses) or "shell" (not in curses) state for use by the reset_prog_mode and  re-
       set_shell_mode  routines.   This is done automatically by initscr.  There is one such save
       area for each screen context allocated by newterm().

       The reset_prog_mode and reset_shell_mode routines restore the terminal  to  "program"  (in
       curses) or "shell" (out of curses) state.  These are done automatically by endwin and, af-
       ter an endwin, by doupdate, so they normally are not called.

       The resetty and savetty routines save and restore the state of the terminal modes.  savet-
       ty  saves  the  current state in a buffer and resetty restores the state to what it was at
       the last call to savetty.

       The getsyx routine returns the current coordinates of the virtual screen cursor in  y  and
       x.  If leaveok is currently TRUE, then -1,-1 is returned.  If lines have been removed from
       the top of the screen, using ripoffline, y and x include these lines; therefore, y  and	x
       should be used only as arguments for setsyx.

       The  setsyx  routine sets the virtual screen cursor to y, x.  If y and x are both -1, then
       leaveok is set.	The two routines getsyx and setsyx are designed to be used by  a  library
       routine, which manipulates curses windows but does not want to change the current position
       of the program's cursor.  The library routine would call getsyx at the beginning,  do  its
       manipulation  of  its own windows, do a wnoutrefresh on its windows, call setsyx, and then
       call doupdate.

       The  ripoffline	routine  provides  access  to  the  same  facility  that  slk_init   [see
       curs_slk(3X)]  uses  to	reduce	the size of the screen.  ripoffline must be called before
       initscr or newterm is called.  If line is positive, a line is removed from the top of std-
       scr;  if  line  is  negative, a line is removed from the bottom.  When this is done inside
       initscr, the routine init (supplied by the user) is called with two  arguments:	a  window
       pointer	to  the one-line window that has been allocated and an integer with the number of
       columns in the window.  Inside this initialization routine, the	integer  variables  LINES
       and  COLS  (defined in <curses.h>) are not guaranteed to be accurate and wrefresh or doup-
       date must not be called.  It is allowable to call wnoutrefresh during  the  initialization

       ripoffline can be called up to five times before calling initscr or newterm.

       The curs_set routine sets the cursor state to invisible, normal, or very visible for visi-
       bility equal to 0, 1, or 2 respectively.  If the terminal supports the visibility request-
       ed, the previous cursor state is returned; otherwise, ERR is returned.

       The napms routine is used to sleep for ms milliseconds.

       Except for curs_set, these routines always return OK.

       curs_set returns the previous cursor state, or ERR if the requested visibility is not sup-

       X/Open defines no error conditions.  In this implementation

	      def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode
		   return an error if the terminal was not initialized, or if the I/O call to ob-
		   tain the terminal settings fails.

		   returns an error if the maximum number of ripped-off lines exceeds the maximum
		   (NRIPS = 5).

       Note that getsyx is a macro, so & is not necessary before the variables y and x.

       Older SVr4 man pages warn that the return value	of  curs_set  "is  currently  incorrect".
       This implementation gets it right, but it may be unwise to count on the correctness of the
       return value anywhere else.

       Both ncurses and SVr4 will call curs_set in endwin if curs_set has been called to make the
       cursor  other  than  normal,  i.e., either invisible or very visible.  There is no way for
       ncurses to determine the initial cursor state to restore that.

       The functions setsyx and getsyx are not described in the XSI  Curses  standard,	Issue  4.
       All other functions are as described in XSI Curses.

       The SVr4 documentation describes setsyx and getsyx as having return type int. This is mis-
       leading, as they are macros with no documented semantics for the return value.

       curses(3X),  curs_initscr(3X),  curs_outopts(3X),   curs_refresh(3X),   curs_scr_dump(3X),
       curs_slk(3X), curs_variables(3X).

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