Reading errno from msvcrt.dll

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How do I get the value of errno and _doserrno from msvcrt.dll? I'm using
define_c_var()(using "_errno" and "__doserrno") to get the addresses. I then use
peek4s() to see what their values are. No matter what, I am getting 28075240 and
28071656 decimal respectively. These are invalid error numbers (I've verified
that by using strerror).

I know I am getting the error that I am intentionally causing because I can use
perror to print the error message.

I might not need this, but I would like to rely on more information than just -1
returned from an IO function.

Anyone have experience in this?

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