Christoph> What's the behaviour of other unix
Christoph> systems when seeking beyond the end of block devices?
The seek succeeds;
On a disc-like device, attempts to write at that offset return -1 EFBIG;
the first attempt to read at that offset returns 0; subequent ones
return -1 and ENXIO.
After the seek, lseek(fd, 0, SEEK_CURRENT) returns the (after end of
file) current offset.
At least for the ones I've been able to test on (UNIXWare, Solaris).
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