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Add networking for target_os = "wasi" #1548

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@haraldh haraldh commented Feb 15, 2022

haraldh and others added 3 commits February 4, 2022 11:37
Based on tokio-rs#1395

Co-authored-by: Thomas de Zeeuw <thomasdezeeuw@gmail.com>
Signed-off-by: Harald Hoyer <harald@profian.com>
With
* bytecodealliance/wasmtime#3711
* rust-lang/rust#93158
merged, mio can have limited support for networking for the
`wasm32-wasi` target.

Signed-off-by: Harald Hoyer <harald@profian.com>
Use the `LISTEN_FDS` mechanism to use pre-opened sockets.

Especially for `wasm32-wasi` there is no other way to get access to sockets,
than to use pre-opened sockets.

Because `wasm32-wasi` does not yet return `TcpListener::local_addr()`, an
unspecified IP address and port will be returned and displayed.

```
$ cargo +nightly build --release --example tcp_server --features="os-poll net"
   Compiling ppv-lite86 v0.2.15
   Compiling getrandom v0.2.3
   Compiling mio v0.8.0 (/home/harald/git/mio)
   Compiling env_logger v0.8.4
   Compiling rand_core v0.6.3
   Compiling rand_chacha v0.3.1
   Compiling rand v0.8.4
    Finished release [optimized] target(s) in 1.75s

$
```

Signed-off-by: Harald Hoyer <harald@profian.com>
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