BUG: curses getch() with high frequency SIGALRM on FreeBSD

gistfile1.txt

#include <stdio.h>
#include <signal.h>
#include <curses.h>
#include <string.h>
#include <sys/time.h>

//#define USE_ALARM

void
sigalrm(int signo)
{
}

int
main(int argc, char *argv[])
{
        WINDOW *win;
        int c;

        win = initscr();
        noecho();
        cbreak();
        keypad(win, TRUE);

#ifdef USE_ALARM
        signal(SIGALRM, sigalrm);
        {
                struct itimerval itv;
                memset(&itv, 0, sizeof(itv));
                itv.it_interval.tv_sec = 0;
                itv.it_interval.tv_usec = 100;
                itv.it_value = itv.it_interval;
                setitimer(ITIMER_REAL, &itv, NULL);
        }
#endif

        for (;;) {
                c = getch();
                printw("c = %d\n", c);
                refresh();
        }
          
}