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This wraps msghdr on Unix and WSAMSG on Windows to be used in send/recvmsg calls.
Wrapper around sendmsg(2).
Instead we'll create a separate MsgHdrMut for recvmsg, similar to IoSlice and IoSliceMut.
To be used in recvmsg(2) calls.
pointer::cast_mut was stablised in 1.65, so it's too new.
Smoke tested on esp32c3 dev board. I've also tested a similar patch backported to v0.4.9 with much greater functionality including tokio + mio with other patches I've been working on and it's fully working. Closes rust-lang#379
This was missed in rust-lang#452 because I wasn't testing with feature="all" enabled for my small socket2 test. For the full tokio integration I was using v0.4.x which didn't need this fix. Properly closes rust-lang#379.
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