Not sure I understand your point, tcsetattr calls a system call on its own... So the alternatives are between doing a trivial system call on the Go stack, or d

Not sure I understand your point, tcsetattr calls a system call on its own... So the alternatives are between doing a trivial system call on the Go stack, or doing a complex stack switch operation that does the (too complicated) System V calling convention ABI translation, and then calls a function that does a system call...