For the JVM: AFAIK, the JIT-generated code (and the interpreter) never does system calls, either directly or indirectly through the C library. Instead, they cal

For the JVM: AFAIK, the JIT-generated code (and the interpreter) never does system calls, either directly or indirectly through the C library. Instead, they call "native" code written in C or C++, and it's that native code which does all the system calls or equivalent.