Async connect and disconnect with epoll (Linux)

Question

I need async connect and disconnect for tcp client using epoll for Linux. There are ext. functions in Windows, such as ConnectEx, DisconnectEx, AcceptEx, etc... In tcp serv

Answer 1

From experience, when detect non-blocking connection , epoll is a little different from select and poll.

with epoll:

After connect() call is made, check return code.

If the connection can not be completed immediately, then register EPOLLOUT event with epoll.

Call epoll_wait().

if the connection failed, your events will be fill with EPOLLERR or EPOLLHUP, otherwise EPOLLOUT will be triggered.