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- correct block read was not possible:
-
Typically results in a
throw
of some OS-derived value (between
-512 and -2048). If the blocks file was just not long enough, blanks are
supplied for the missing portion.
- I/O exception in block transfer:
-
Typically results in a
throw
of some OS-derived value (between
-512 and -2048).
- invalid block number:
-
-35 throw
(Invalid block number)
- a program directly alters the contents of
BLK
:
-
The input stream is switched to that other block, at the same
position. If the storing to
BLK
happens when interpreting
non-block input, the system will get quite confused when the block ends.
- no current block buffer for
UPDATE
:
-
UPDATE
has no effect.
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