Random number generation generally isn't handled by system calls. It's just computation. (Some languages do provide support for hardware [pseudo-]random number

Random number generation generally isn't handled by system calls. It's just computation. (Some languages do provide support for hardware [pseudo-]random number generation. C doesn't.) More generally, using system calls directly for things like getting the current time makes sense only if you don't care about portability. C can support both portable and non-portable code. Both are important. I get the impression that C is too high-level, and assembly language is too tedious, to fully support your requirements. I sympathize with your situation, but it's not one that most programmers share.