I have a file system that has really odd blocking.
All files have a variable length header (basically a directory
entry) at their start.
Most but not all sectors, have a small fixed length signature as
well as some link data at their start.
The net result is that implimentation would be simpler if I could
just read/write, the amount of data
that can be done with the least amount of work, even if that is less
than was requested.
If I receive a request to read 512 bytes, and I return that I have
read 486, is either the OS, libc, or something else
going to treat that as an error, or are they coming back for the
rest in a subsequent call ?
I though I recalled that read()/write() returning a cound less than
requested is not an error.
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