On 11/27/07, Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > Doug McNaught <doug@xxxxxxxxxxxx> writes: > > Kind of. Mach is still running underneath (and a lot of the app APIs > > use it directly) but there is a BSD 'personality' above it which > > (AIUI) is big parts of FreeBSD ported to run on Mach. So when you use > > the Unix APIs you're going through that. > The one bit of the OSX userland code that I've really had my nose rubbed > in is libedit, and they definitely took that from NetBSD not FreeBSD. > You sure you got your BSDen straight? > > Some random poking around at > http://www.opensource.apple.com/darwinsource/10.5/ > finds a whole lot of different-looking license headers. But it seems > pretty clear that their userland is BSD-derived, whereas I've always > heard that their kernel is Mach-based. I've not gone looking at the > kernel though. The majority of the BSDness in the kernel is from FreeBSD, but it is very much a hybrid, Mach being the other parent. Userland is a mixed bag; FreeBSD, NetBSD, OpenBSD are all visible in different places. In older versions I've also seen 4.4BSD credited directly (as in not even caught up with FreeBSD), but I believe most of that has been updated in newer versions of the OS. Apple also has employees who are major developers for both FreeBSD and NetBSD at least, though I haven't kept up with who is doing what. http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgramming/Architecture/chapter_3_section_3.html ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
