Announcing sendfile-0.1:
A library which exposes zero-copy sendfile functionality in a portable way.
http://hackage.haskell.org/package/sendfile-0.1

Right now it supports natively linux 2.6+ (maybe older too) and windows 2000+ -- on other platforms it will fall back seamlessly to a portable haskell implementation. Please test it out and send your experiences / bug reports to HAppS <at> googlegroups.com. Patches for other platforms also welcome (but please preserve the existing style).

Recommended initial testing steps:

cabal install sendfile
wget http://patch-tag.com/r/sendfile/snapshot/current/content/raw/test.hs
runghc test.hs
open http://127.0.0.1:8000 in your web browser and see if test.hs was rendered properly (firefox recommended)
see which mode it was rendered in (stdout will say one of WIN32_SENDFILE, LINUX_SENDFILE, or PORTABLE_SENDFILE)

Happy Hacking!
Matthew Elder