[Mono-dev] [PATCH] Cache errno for serial port

[Carlos Alberto Cortez]

Hey,

The attached patch adds a 'serial_errno' variable in
mono/support/serial.c, to cache the last error related to serial port
functions.

At first I tried to just create a function directly retrieving errno,
but it was getting a different value from the original (probably some
code modified it after the pinvoke call?).

This is needed to a simple but better error reporting in the
System.IO.Ports.SerialPort class.
     1. 
Carlos.
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