#define PAGE_SIZE 4096#define O_DIRECT      040000int main(void){	printf("wiping /dev/hda1, fd %d\n",o);	memset(page,0,PAGE_SIZE);	for(i=0; i<0x1003; i++)	{		int r;		lseek(o, offset + i * PAGE_SIZE, SEEK_SET);		r = write(o, page, PAGE_SIZE);		if(r<0)		{			printf("r %d\n",r);			exit(-1);		}	}}