当Go中的套接字断开连接时，我能知道它是好是坏吗？

Question

Say I open a connection to a server like:

conn, _ := net.DialTimeout("tcp", "127.0.0.1:2121", 10000000)

and I do some stuff and then call

conn.Close()

that's option 1. But what if I don't call Close on the conn and just call

os.Exit(1)

leaving the connection still open. That's option 2. i.e. I'm trying to simulate a user uploading a file and either reaching the ending and really Closing the connection... or ending the stream being writen to the socket but never officially closing it.

Back on the server side, is there anyway to tell which event happened? The good Close or the bad one?

Does net.Listener have like some sort of callback to let me know. Because when I just call:

n, err := serverConn.Read()

I get an EOF err in either case, good or bad.

Answer 1

It depends on the operating system. The one you're on clearly does a graceful close for you if your process exits with an unclosed socket, so it is equivalent to 'good'. With the other kind you will get an ECONNRESET.