[Mono-dev] [PATCH] Cache errno for serial port
Miguel de Icaza
miguel at novell.com
Mon Feb 18 20:19:01 EST 2008
> The attached patch adds a 'serial_errno' variable in
> mono/support/serial.c, to cache the last error related to serial port
> 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.
I think you can use DllImport's built-in SetLastError/GetLastError
framework for this.
Just add this to the DllImport definitions:
[DllImport ("something", SetLastError=true)]
And then in the calling code, call:
This will contain the errno value.
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