From: Gary Hasson <gary@...>
Date: 2009-11-29T09:25:26+09:00
Subject: Re: Ruby byte access to disk sectors like dd does

Thank you all for your guidance. I am now able to do with Ruby what I 
previously need dd for.

However, I am not able to cleanly test for the end of file due to the 
following error:

until file_1.eof?
  file_1_byte = file_1.sysread( 1 )
end

ERROR MSG:
./Ruby_file_test.rb:23:in `sysread': sysread for buffered IO (IOError)
  from ./Ruby_file_test.rb:23

All of my file accesses are sysread, syswrite, and sysseek, which are 
not compatible with IO#eof.

Using the file size to prevent hitting the EOF does not work for 
/dev/sdb.

So, I just let it generate an EOF error and then rescue it.

It seems like there ought to be a working EOF function for IO#sys...

Gary
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