Put App running on background

- (void)applicationSuspend:(struct __GSEvent *)fp8
{
[textView setText: @" in applicationSuspend"];

int i = 0;
while ( i < 5) {
GSEventPlaySoundAtPath(@"/System/Library/CoreServices/SpringBoard.app/unlock.
aiff");
i++;
sleep(1);
}

[self terminate];
}