Setting a socket nonblocking after a blocking connect

Question

Is it safe to do connect() in blocking and after that, make the socket nonblock and do all nonblocking stuff for example epoll()/select()?

Does it cause to lack of some nonblocking operation that might I'm not considering?

Answer 1

It's perfectly safe so long as you make sure to check the return value of fnctl for an error. If not, then you could find your program halting unexpectedly.