The Wikipedia BSD article is good (and accords with my own understanding, for what that’s worth). It says that Darwin, the system on which Apple’s Mac OS X is built, is a derivative of 4.4BSD-Lite2 and FreeBSD, and notes that 4.4BSD is the last release that Berkeley was involved with.
So, Darwin is as BSD as you can get (just like all the other BSDs!). OS X refers to those parts of the distribution which aren’t open-source, principally the GUI, but including a variety of frameworks, and anything which relies on these won’t be portable.
OS X as a whole is a UNIX 03 system. That’s equivalent to being a truly POSIX-compliant system (as opposed to being POSIX-like).
As other answers have noted, the userland parts of the OS are unsurprising to anyone with much unix experience, and I’ve rarely had any difficulty building portable-unix software on OS X.
In contrast, the non-userland parts of the OS are pretty different. Apple seems to be willing to innovate in those areas fairly cheerfully. I think (but I’m not positive) that these changes are formally part of Darwin. One of the most obvious differences is that launchd has replaced cron, at, inetd, and much of the startup infrastructure.
….But go ahead and tell us how mac and open source is antithetical
Edit: for the downvoters, yes Apple has had their hands in open source from the start and never stopped. Doesn’t mean they’re the goddamn FOSS Jesus
Open source software is at the heart of Apple platforms and developer tools. Apple manages the following projects and encourages your contribution.
The fuck are you high? Even microsoft, google, and meta support or have their own OSS projects. Apple just used someone else’s work as a base and doesn’t contribute to anything, what are you defending here?
I’m “defending” the fact that development on a mac is not some bastardized union, FOSS has had its place in the Mac world since forever and to say that using a mac to work on FOSS makes you a hypocrite or a joke is fucking dumb.
Furthermore
Open source software is at the heart of Apple platforms and developer tools. Apple manages the following projects and encourages your contribution.
I mean, you’re using hardware from a company that is very blatantly anti consumer rights - thou shall not repair, thou shall not upgrade, thou shall not use third party anything, thou shall use Metal, for we despise OpenGL; not to mention that you have even less control on the mobile devices unless you pay a developer fee.
The fact that MacOS has some FOSS under the hood is completely irrelevant.
OSX is not simply the non open source pieces, I get reading comprehension is hard for you but come on. People will upvote anything if it confirms their emotional biases lol
The entire internet is built on open-source technologies, as you probably know. That doesn’t make the internet as a whole an open-source thing. Transport technologies are open, a lot of hardware and software around it is not, and that’s still talking about the infrastructure, not what is actually running on top of all that.
It’s like saying Windows is open-source because they use curl. And Microsoft is as open to open-source code as long as they can train their LLM on it and sell it to you. Sure they provide money and developers to some projects, but Windows, Office, Azure will most likely never be actually open to code investigations, forget free.
Yes, Apple, like many other corporations, uses FOSS components in their closed source software because it saves them money from free labor. There are also parts that make sense for them to distribute under a free license because they need developers to implement them in their software to work with their OS or browser.
That doesn’t mean they’re actually benefitting the FOSS community in any way, it just means the FOSS community is benefitting their closed source software for free.
How exactly does that show that open source is antithetical to Apple? Is that whole ass list I provided at the end of my comment just a 2 bullet point of osx, iOS???
No it’s not, so please actually read what you are emotionally reacting to first.
Actually the mac OS is built in part with freeBSD. Open source nix has always had a place at Apple, but Apple greedy and bad right?
http://en.wikipedia.org/wiki/BSD
Here’s a good breakdown: https://stackoverflow.com/a/3449195
….But go ahead and tell us how mac and open source is antithetical
Edit: for the downvoters, yes Apple has had their hands in open source from the start and never stopped. Doesn’t mean they’re the goddamn FOSS Jesus
https://opensource.apple.com/projects/
The fuck are you high? Even microsoft, google, and meta support or have their own OSS projects. Apple just used someone else’s work as a base and doesn’t contribute to anything, what are you defending here?
I’m “defending” the fact that development on a mac is not some bastardized union, FOSS has had its place in the Mac world since forever and to say that using a mac to work on FOSS makes you a hypocrite or a joke is fucking dumb.
Furthermore
https://opensource.apple.com/projects/
I mean, you’re using hardware from a company that is very blatantly anti consumer rights - thou shall not repair, thou shall not upgrade, thou shall not use third party anything, thou shall use Metal, for we despise OpenGL; not to mention that you have even less control on the mobile devices unless you pay a developer fee.
The fact that MacOS has some FOSS under the hood is completely irrelevant.
From your own quote
OSX is not simply the non open source pieces, I get reading comprehension is hard for you but come on. People will upvote anything if it confirms their emotional biases lol
The entire internet is built on open-source technologies, as you probably know. That doesn’t make the internet as a whole an open-source thing. Transport technologies are open, a lot of hardware and software around it is not, and that’s still talking about the infrastructure, not what is actually running on top of all that.
It’s like saying Windows is open-source because they use curl. And Microsoft is as open to open-source code as long as they can train their LLM on it and sell it to you. Sure they provide money and developers to some projects, but Windows, Office, Azure will most likely never be actually open to code investigations, forget free.
Yes, Apple, like many other corporations, uses FOSS components in their closed source software because it saves them money from free labor. There are also parts that make sense for them to distribute under a free license because they need developers to implement them in their software to work with their OS or browser.
That doesn’t mean they’re actually benefitting the FOSS community in any way, it just means the FOSS community is benefitting their closed source software for free.
Windows is a free and open source software, it incorporates open source components.
Nowhere did I say that mac os is open source, all I said is mac and open source are not antithetical.
Furthermore
https://opensource.apple.com/projects/
Is osx / iOS itself open source?
How exactly does that show that open source is antithetical to Apple? Is that whole ass list I provided at the end of my comment just a 2 bullet point of osx, iOS???
No it’s not, so please actually read what you are emotionally reacting to first.
https://lemmy.world/comment/10326685