Zhe Weng 7c422381ca net/tcp: Set SO_ERROR for poll error in setup
Normally, `SO_ERROR` for disconn events will be set by `tcp_poll_eventhandler`, but when the socket is closed before poll, we should also set the `SO_ERROR`.

On Linux, `tcp_poll` returns `EPOLLERR` event when `sk->sk_err` has value but doesn't let `poll` fail (doesn't set `errno`). https://github.com/torvalds/linux/blob/v6.5/net/ipv4/tcp.c#L594-L596
Note: `sk->sk_err` can be get by socket option `SO_ERROR` on Linux, so `POLLERR` will always be together with `SO_ERROR`.

Common libs like curl may try to read `SO_ERROR` on `POLLERR`.

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
2023-09-14 14:32:56 +08:00
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