bkgdset, wbkgdset, bkgd, wbkgd - curses window background manipulation
void bkgdset(const chtype ch);
void wbkgdset(WINDOW *win, const chtype ch);
int bkgd(const chtype ch);
int wbkgd(WINDOW *win, const chtype ch);
chtype getbkgd(WINDOW *win);
The bkgdset and wbkgdset routines manipulate the background of the
named window. The window background is a chtype consisting of any com‐
bination of attributes (i.e., rendition) and a character. The
attribute part of the background is combined (OR'ed) with all non-blank
characters that are written into the window with waddch. Both the
character and attribute parts of the background are combined with the
blank characters. The background becomes a property of the character
and moves with the character through any scrolling and insert/delete
To the extent possible on a particular terminal, the attribute part of
the background is displayed as the graphic rendition of the character
put on the screen.
The bkgd and wbkgd functions set the background property of the current
or specified window and then apply this setting to every character
position in that window:
The rendition of every character on the screen is changed to the
new background rendition.
Wherever the former background character appears, it is changed
to the new background character.
The getbkgd function returns the given window's current background
The routines bkgd and wbkgd return the integer OK. The SVr4.0 manual
says "or a non-negative integer if immedok is set", but this appears to
be an error.
Note that bkgdset and bkgd may be macros.
These functions are described in the XSI Curses standard, Issue 4. The
draft does not include const qualifiers on the arguments. The standard
specifies that bkgd and wbkgd return ERR, on failure. but gives no
SEE ALSOcurses(3X), curs_addch(3X), curs_outopts(3X)curs_bkgd(3X)