[Python-ideas] Extend socket.accept to put accepted socket in non-blocking mode

[Saúl Ibarra Corretgé]

Hi,

(I hope this list is the right place for this)

I was browsing around for accept4 usage in Python and I saw it's already 
used internally in socket.accept (on Linux only), albeit it's not 
exposed, so accepting an incoming connection and setting it to be 
non-blocking takes 3 syscalls.

accept4 allows us to do this with a single syscall, and it made it into 
FreeBSD 10, so that's another system that could benefit from this 
optimization.

Would it be desirable to extend socket.accept to something like:

socket.accept(set_non_blocking=False)

which would use accept4's flags on supported systems and fallback to 
regular fcntl on others?

The idea is to accept an incoming connection and make it non-blocking at 
the same time, asyncio and other frameworks would benefit from this by 
doing one function call and 2 syscalls less (on supported systems, that is).


Cheers,

-- 
Saúl Ibarra Corretgé
bettercallsaghul.com