My solaris9 seems to have them in userspace.
/ Per Hedbor ()
Previous text:
2002-09-04 00:19: Subject: argv[0]?
Solaris9 is said to have them in the kernel, linux 2.5 is in the process of getting an in-kernel AIO interface, too - I also heard that FreeBSD 5.x should have it as well.
/ Marek Habersack (Grendel)