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by klodolph 3310 days ago
Well, then allow me to cite the standard for you.

> If a multi-threaded process calls fork() ... the child process may only execute async-signal-safe operations until such time as one of the exec functions is called.

IEEE Std 1003.1-2008, 2016 Edition

http://pubs.opengroup.org/onlinepubs/9699919799/

I don't know about "design is broken". I personally think the fork()/exec() model is a clumsy way to create a new process, but that's a matter of taste.