It runs on an OS (POSIX compliant). If you look at connect.s you can see that he uses syscalls (connect()/socket()). It's roughly what would produce a simple co

It runs on an OS (POSIX compliant). If you look at connect.s you can see that he uses syscalls (connect()/socket()). It's roughly what would produce a simple compiler targeting linux. Otherwise, it would have had to write a TCP stack, drivers, ...