The Linux kernel has only one set of system calls. Everything you can do with Linux, you can do through it's syscall interface. Android doesn't change this, alt

The Linux kernel has only one set of system calls. Everything you can do with Linux, you can do through it's syscall interface. Android doesn't change this, although it ships a different, more minimal libc. The OSX kernel has two, due to it's bolt-on nature. Mach message passing and BSD system calls. As far as I am aware, the BSD system calls is an emulation layer, and is not entirely complete. As a user, you don't care; the quirks of both systems are papered over by libc, which does the appropriate syscall dance to create a posix compliant system. (For an example of a Linux quirk, 'exit()' on Linux doesn't actually exit the process, it only exits the current thread).