POSIX is an OS API. You're complaining that C interacts with the operating system to do useful work? What language do you use that can do useful work without interacting with the OS?
POSIX is the part of the C standard library in UNIX, that should have been part of ISO C as well.
It wasn't, so any C application that is more than a toy hello world with stdio, pings back into POSIX for any kind of meaningful work, that wants to stay cross platform.
Basically it the the C runtime library, that wasn't part of ISO.
I use JVM, .NET, Web and C++, not caring if the runtimes are bare metal or running on top of an OS, type 1 hypervisor, or whatever.
>I use JVM, .NET, Web and C++, not caring if the runtimes are bare metal or running on top of an OS, type 1 hypervisor, or whatever.
If you're downloading a JVM binary, you're missing out on the build step. It's C dependent, friend. How do you think that VM interfaces with the OS? Go on. Try it. ldd the java executable.
It's libc all the way down. C itself is a sort of "VM" specification utilized to create the tools to run the tools to build the tools that make other high level languages possible.
Unless you create something entirely custom in platform specific assembly, you're running on C at some level.
> POSIX is the part of the C standard library in UNIX, that should have been part of ISO C as well.
I'm not sure what you're trying to say. The Portable Operating System Interface (POSIX) is specified in an ISO standard, and basically specifies what a UNIX operating system's programmable interfaces are.
I don't think you really understand what POSIX is.
POSIX is an IEEE standard (example [1]). POSIX defines the Operating System API. You can see the C implementation of this API here[2].
> so any C application that is more than a toy hello world with stdio, pings back into POSIX for any kind of meaningful work
Simply calling printf relies on writing to a file descriptor. A "Hello world" application on linux uses posix. ANY hello world application uses posix. Even your Java Hello world App will call into the posix APIs. `System.out.println` isn't magic. It calls into the C posix implementation.
If you want to do anything in any language (write to files, create threads, allocate memory, network communication), you need to go through the OS. POSIX is what defines that OS interface.
> I use JVM, .NET, Web and C++, not caring if the runtimes are bare metal or running on top of an OS, type 1 hypervisor, or whatever.
