flash — flash the screen
function alerts the user. It flashes the screen, or if that is not possible,
it sounds the audible alarm on the terminal.
If neither signal is possible, nothing happens.
function always returns OK.
No errors are defined.
Nearly all terminals have an audible alarm, but only some can flash the
First released in X/Open Curses, Issue 4.
In previous issues, this function was included in the entry for
It is moved to its own entry in X/Open Curses, Issue 4, the argument
list is explicitly declared as void, and the
section is changed to indicate that the function always returns OK.