win

Is a pointer to the window in which to enable non-blocking.

bf

Is a Boolean expression.

If enabled, (bf is TRUE), the nodelay() function causes getch(3XCURSES) to return ERR if no input is ready. When disabled, getch() blocks until a key is pressed.

On success, the nodelay() function returns OK. Otherwise, it returns ERR.

None.

getch(3XCURSES), halfdelay(3XCURSES), notimeout(3XCURSES)