Re: [PATCH v12 0/2] MR2100: ntdll: Do not send data to port 0.

[Zebediah Figura (＠zfigura)]

> Any insight into the best way to get the protocol inside `try_send`, presently I'm using `getSockOpt` as follows:
>
> ```c
>     opt_err = getsockopt(fd, SOL_SOCKET, SO_TYPE, &protocol, &opt_len);
>     if (!opt_err && protocol == SOCK_DGRAM && is_port0(&unix_addr))
> ```
>
> This causes other tests to completely freeze up.

SO_TYPE returns the socket type, not its protocol, and there are other DGRAM protocols than UDP (in particular raw and ICMP), which is precisely why I was advocating checking the protocol specifically. Unfortunately there's no portable way to retrieve the protocol with getsockopt(), but we could return it from the send_socket server request.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/2100#note_23532