> XPC is just a layer on top of Mach IPC. Not very familiar with the app sandbox model, but what exactly would be truly innovative about it?
It is not part of any POSIX compliant UNIX.
It also pushes developers into a micro-kernel style of application development, which isn't common in UNIX.
> Also, it's a hybrid of Mach, which is heavily anachronistic and clunky. DragonFly BSD, on the other hand, actually does through the vkernel mechanism.
Besides FreeBSD, I admit I hardly know any other BSD.
> I have no idea what you mean by the third one. Are you saying that the root user's privileges are segmented into multiple subsystems?
In El Capitan, you can only be real root in safe mode. In normal mode there are paths (e.g. /bin, /usr/bin,...) and APIs that aren't available even to processes running as root.
> You can write applications targeting any subsystem provided there are bindings, which there are. For instance, Python and Vala are heavily used in contemporary Unix-like DEs for application programming.
There is a big difference in being a first class language used in the vendor SDK and IDE, and a third party one used by some developers.
It is not part of any POSIX compliant UNIX.
It also pushes developers into a micro-kernel style of application development, which isn't common in UNIX.
> Also, it's a hybrid of Mach, which is heavily anachronistic and clunky. DragonFly BSD, on the other hand, actually does through the vkernel mechanism.
Besides FreeBSD, I admit I hardly know any other BSD.
> I have no idea what you mean by the third one. Are you saying that the root user's privileges are segmented into multiple subsystems?
In El Capitan, you can only be real root in safe mode. In normal mode there are paths (e.g. /bin, /usr/bin,...) and APIs that aren't available even to processes running as root.
> You can write applications targeting any subsystem provided there are bindings, which there are. For instance, Python and Vala are heavily used in contemporary Unix-like DEs for application programming.
There is a big difference in being a first class language used in the vendor SDK and IDE, and a third party one used by some developers.