Function Wait for an input without blocking the loops?

[Kew]

i am using Mac os X, which running Unix system. i had tried getch() function which can't work in this case. I am wondering is that any method to make the function wait for an input without blocking? Thank you

Here is the code:

#include <iostream>
#include <curses.h>

// checks if a key a has been pressed(non-blocking)
int kbhit()
{
	//nodelay(stdscr, TRUE);
    int ch;
    getchar();
    //ch = 1;
    //system("stty cbreak -echo");
	
    if (ch != ERR) {
        //ungetch(ch);
        return 1;
    } else {
        return 0;
    }
}

using namespace std;


int main()
{

	bool gameover = false;
	//system("stty raw");

	while(!gameover)
	{
		
		if(kbhit())
		{
			cout << "You enter something" << endl;
			gameover = true;
		}
		else
		{
			cout << "nothing is enter\n";
			gameover = false;
		}
	}

	//system ("stty cooked");
	//system("stty cooked echo");
	

	return 0;
}