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

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curs_bkgd(3X)									    curs_bkgd(3X)

       bkgdset, wbkgdset, bkgd, wbkgd, getbkgd - curses window background manipulation routines

       #include <curses.h>

       void bkgdset(chtype ch);
       void wbkgdset(WINDOW *win, chtype ch);
       int bkgd(chtype ch);
       int wbkgd(WINDOW *win, chtype ch);
       chtype getbkgd(WINDOW *win);

       The bkgdset and wbkgdset routines manipulate the background of the named window.  The win-
       dow background is a chtype consisting of any combination 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 line/character operations.

       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  win-
       dow 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

	      Wherever the former background character appears, it is changed to  the  new  back-
	      ground character.

       The  getbkgd  function  returns	the given window's current background character/attribute

       The routines bkgd and wbkgd return the integer OK.  The SVr4.0 manual says "or a non-nega-
       tive 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.  It specifies that bkgd
       and wbkgd return ERR on failure, but gives no failure conditions.

       curses(3X), curs_addch(3X), curs_attr(3X), curs_outopts(3X)

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