리눅스와 유닉스상에서 다르게 돌아가는 소스...질문 좀 드릴게요

#include 
#include 
#include 
#include 
 
static struct termios stored_settings;
 
void echo_off(void)
{
    struct termios new_settings;
    tcgetattr(0, &stored_settings);
    new_settings = stored_settings;
    new_settings.c_lflag &= (~ECHO);
    new_settings.c_lflag &= (~ICANON);
    tcsetattr(0, TCSANOW, &new_settings);
 
    return;
}
 
void echo_on(void)
{
    tcsetattr(0, TCSANOW, &stored_settings);
    return;
}
 
void get_pass(char *pass)
{
    char buf;
    int i=0;
 
    printf("Passwd:");
    echo_off();
    while( (buf = getc(stdin)) != 10 )
    {
        if(buf != 8)
        {
            pass[i]=buf;
            putc(42,stdout);
            i++;
        }
        else
        {
            pass[i-1] = 0;
            putc(8,stdout);
            i--;
        }
    }
    echo_on();
}
 
int main(void)
{
    char test[5+1] = "\0";
 
    GetPass("pass  ", test, 5);
    printf("inputpass[%s]\n",test);
}