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sysread 

        # IO.sysread

(from ruby core)
---
    ios.sysread(maxlen[, outbuf])    -> string

---

Reads *maxlen* bytes from *ios* using a low-level read and returns them
as a string.  Do not mix with other methods that read from *ios* or you
may get unpredictable results.

If the optional *outbuf* argument is present, it must reference a
String, which will receive the data. The *outbuf* will contain only the
received data after the method call even if it is not empty at the
beginning.

Raises SystemCallError on error and EOFError at end of file.

    f = File.new("testfile")
    f.sysread(16)   #=> "This is line one"

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