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The patch compile failed on msvc
comment: https://elixir.bootlin.com/linux/v5.10.149/C/ident/tcp_sendmsg_locked sock_sendmsg->inet_sendmsg|inet_sendmsg6->tcp_sendmsg|udp_sndmsg 1, return bytes sent, 2, try to send a full slice from iov for each try. 3, there is no sendmsg on win, only wsasendmsg