6
read from broken device: -1
8
write to broken device: -1
32
partial read from file: 3
38
partial read from end of file: 2
44
partial read from before start of file: 0
49
write to start of file: 3
53
write to end of file: 3
57
write after end of file: 8
63
final: wri4567890wri\0\0\0\0\0\0\0\0\0\0writeme\0