REPOSITION-FILE is performed as usual: Afterwards,
FILE-POSITION returns the value given to
End-of-file, i.e., zero characters are read and no error is reported.
An appropriate exception may be thrown, but a memory fault or other problem is more probable.
The ior produced by the operation, that discovered the problem, is thrown.
The ior produced by
open-file is thrown.
There are no unmapped legal block numbers. On some operating systems, writing a block with a large number may overflow the file system and have an error message as consequence.
source-id performs its function. Typically it will give the id of
the source which loaded the block. (Better ideas?)