win x64 sdk:10.0.18362.0 + VS2019， Udp-svr EPOLLIN WSARecvFrom and Tcp-client EPOLLIN WSARecv() both return(-1) and errno(112), not work? about wepoll

[piscisaureus]

What is the issue?

[QingruiHuang]

i add some code in master/test-multi-poll.c -> poll_thread();
when the svr-sock has event [EPOLLIN]
then WSARecvFrom(svr-sock), but return -1, recv nothing, why?

[piscisaureus]

then WSARecvFrom(svr-sock), but return -1, recv nothing, why?

What is the error you get after WSARecvFrom returns -1?

[QingruiHuang]

win x64 sdk: Windows Kits\10\Include\10.0.18362.0

errno = 0 or 112 [EINPROGRESS]

Got event (port 000000000000010C, thread 0000000000000114)
WSARecvFrom (port:000000000000010C, thread:0000000000000114, errno:112) -> [r:-1,c:0]={}
Got event (port 00000000000000D4, thread 00000000000000E0)
WSARecvFrom (port:00000000000000D4, thread:00000000000000E0, errno:0) -> [r:-1,c:0]={}

[QingruiHuang]

I used wepoll to write a TCP server, tcp-svr EPOLLIN, then accept okey;
but when tcp-client EPOLLIN, WSARecv(clientfd), it also return - 1; I thought I did something wrong, and now I to use your demo for testing, and got the same return(-1) and errno(112).
EPOLLOUT hasn't been tested yet。

[piscisaureus]

errno = 0 or 112 [EINPROGRESS]

I'm sorry, please read the (win32) manual first.
Hint: errno is not set after WSARecv/WSARecvFrom failure.