Fwd: eio.c bug - use of errno without testing result

[Liam]

The issue is... because sendfile(2) on Linux and FreeBSD succeed but set an
erroneous errno, an app which simply checks the eio req->errorno to decide
if there's an error may fail. Node.js does this as it provides callbacks
with either an error or data, never both.

Since eio is supports multiple OSes, one might expect it to hide OS
eccentricities?

(See
http://groups.google.com/group/nodejs/browse_thread/thread/795ebe75fdb1ac82)
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