How do you make the iPhone vibrate for arbitrary durations?

AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

MeCCA_Vibrator *v = new MeCCA_Vibrator;
v->activate(1);
sleep(5);
v->deactivate();

extern void * _CTServerConnectionCreate(CFAllocatorRef, int (*)(void *, CFStringRef, CFDictionaryRef, void *), int *);
extern int _CTServerConnectionSetVibratorState(int *, void *, int, int, float, float, float);

connection = _CTServerConnectionCreate(kCFAllocatorDefault, &vibratecallback, &x);

_CTServerConnectionSetVibratorState(&x, connection, 3, intensity, 0, 0, 0);

_CTServerConnectionSetVibratorState(&x, connection, 0, 0, 0, 0, 0);