What is the standard way for network I/O in C, C++, Python, PHP and Ruby? I am not in the business of conjuring up hypothetical situations about the demise of

What is the standard way for network I/O in C, C++, Python, PHP and Ruby? I am not in the business of conjuring up hypothetical situations about the demise of Lisp implementations and libraries; that doomsday scenario of having to recreate civilization from specs is simply not in my contingency plan :-) Never underestimate the power of convention, de facto is the rule, rather than the exception.