Unfortunately POSIX also shares the same implementation defined behaviour of C.<p>I had my share of headaches when porting across UNIX systems.<p>Also POSIX is now stagnated around support for CLI and daemon applications. There is hardly any updates for new hardware or server architectures.<p>Actually, having used C compilers that only knew K&amp;R, I would say POSIX is the part that should have been part of ANSI C, but they didn&#x27;t want a large runtime tied to the language.