If you're going to be so pedantic as to say that linux doesn't offer a C interface, then you also have to acknowledge that linux is not an operating system. If

If you're going to be so pedantic as to say that linux doesn't offer a C interface, then you also have to acknowledge that linux is not an operating system. If linux is not an operating system, what is? Gnu/linux is a very popular operating system offering a c interface, as is android linux. I do not know of any linuxoid operating systems not offering a c interface.