aio_error query

Hello

http://www.kernel.org/doc/man-pages/online/pages/man3/aio_error.3.html

Is this really positive? errno is an int, and the values I think are not 
guaranteed to be positive (like with glibc). I work on a system where 
they are all negative.

        *  A positive error, if the asynchronous I/O operation failed. 
This is the
           same value that would have been stored in the errno variable 
in the case of
           a synchronous read(2), write(2), fsync(2), or fdatasync(2) call.

Best regards, Jon
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