получить (или вернуть) символы с клавиатуры терминала curses (get (or push back) characters from curses terminal keyboard)
Возвращаемое значение (Return value)
All routines return the integer ERR upon failure and an integer
value other than ERR (OK in the case of ungetch) upon successful
completion.
ungetch
returns ERR if there is no more room in the FIFO.
wgetch
returns ERR if the window pointer is null, or if its
timeout expires without having any data, or if the
execution was interrupted by a signal (errno will be set
to EINTR).
Functions with a 'mv' prefix first perform a cursor movement
using wmove, and return an error if the position is outside the
window, or if the window pointer is null.
