尝试以持续时间和频率发出蜂鸣声时出现ioctl错误

I'm trying to make a beep sound with a frequency and a duration, i'm using ioctl and a file with the console path (I think it is right, i'm using debian 6, by the way) but i don't know why it doesn't work. The code reaches the line ioctl, but it doesn't beep. Im working in a Virtual Machine. The drivers should not be the problem because i have installed my own driver that controls the keyboard leds and makes no problem.I'm trying to make a beep sound with a frequenc