C was created to write Unix on PDP-11 hardware. Prior to that operating systems were typically written in assembler. C was seen as a high level assembler and only later ported to other hardware.

Realistically, C should have been restricted for writing operating systems and device drivers. It is far too low-level for application programming. But since it was often the only portable high level language, software vendors adopted it for purposes that it was never designed to handle. That was partly the reason that C++ and Objective C emerged.