Auto merge of #70136 - hermitcore:network_tcp, r=dtolnay

add basic IP support in HermitCore

- add initial version to support sockets
- use TcpStream as test case
- HermitCore uses smoltcp as IP stack for pure Rust applications
- further functionalities (e.g. UDP support) will be added step by step
- in principle, the current PR is a revision of #69404

Cargo.lock

@@ -1377,9 +1377,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.1"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f22b8f315b98f415780ddbe9163c7dbbc5a07225b6d102ace1d8aeef85775140"
+checksum = "1010591b26bbfe835e9faeabeb11866061cc7dcebffd56ad7d0942d0e61aefd8"
 dependencies = [
  "compiler_builtins",
  "libc",

src/libstd/sys/hermit/mod.rs

@@ -93,9 +93,7 @@ pub unsafe extern "C" fn __rust_abort() {
 
 #[cfg(not(test))]
 pub fn init() {
-    unsafe {
-        let _ = net::init();
-    }
+    let _ = net::init();
 }
 
 #[cfg(not(test))]