#!/usr/bin/python                                                                                                                               
import sys
import os
import fcntl
import struct
import array

PAD_SIZE=1023

if __name__ == "__main__":
    prog, drv = sys.argv
    fd = os.open(drv, os.O_RDONLY|os.O_NONBLOCK)
    b = array.array('c')
    b.extend(struct.pack("@L", 0))      # length of input 
    b.extend(struct.pack("@L", 1024))   # length of output buffer 
    b.append(chr(0x12))    # INQUIRY */ 
    b.append(chr(0x00))    # lun=0, evpd=0 */ 
    b.append(chr(0x00))    # page code = 0 */ 
    b.append(chr(0x00))    # (reserved) */ 
    b.append(chr(0xff))    # allocation length */ 
    b.append(chr(0x00))    # control */ 
    b.extend(chr(0) * (PAD_SIZE - len(b)))
    old_b = b[:]
    status = fcntl.ioctl(fd, 1, b, True)
    print "status", status
    assert not status, "%s" % status
    assert b[:] != old_b[:], "BUG: output wasn't changed!"
    print "POST", b
    pagestart = b[8:]
    print pagestart[8:16]
    print pagestart[16:32]
    print pagestart[32:48]