Merge pull request #765 from Gelbpunkt/net-feature

hermit: Add net feature

Author: mkroening

Cargo.lock

@@ -12,6 +12,7 @@ members = [
     "examples/fuse_test",
     "examples/hello_world",
     "examples/httpd",
+    "examples/loopback",
     "examples/miotcp",
     "examples/mioudp",
     "examples/polling",

Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "loopback"
+edition = "2021"
+
+[target.'cfg(target_os = "hermit")'.dependencies]
+hermit = { path = "../../hermit", default-features = false }
+
+[features]
+default = ["hermit/acpi", "hermit/net", "hermit/pci", "hermit/pci-ids", "hermit/tcp"]

examples/loopback/Cargo.toml

@@ -0,0 +1,39 @@
+//! This example requires setting HERMIT_IP=127.0.0.1
+
+use std::io::{self, Read, Write};
+use std::net::{Ipv4Addr, SocketAddr, TcpListener, TcpStream};
+use std::thread;
+
+#[cfg(target_os = "hermit")]
+use hermit as _;
+
+const TO_SEND: &[u8] = b"hello loopback";
+
+fn handle_client(mut stream: TcpStream) -> io::Result<()> {
+	let mut buf = [0u8; TO_SEND.len()];
+	stream.read_exact(&mut buf)?;
+	assert_eq!(&buf, TO_SEND);
+	stream.write_all(TO_SEND)
+}
+
+fn main() -> io::Result<()> {
+	let addr = SocketAddr::from((Ipv4Addr::LOCALHOST, 9975));
+
+	let t = thread::spawn(move || {
+		let mut client = TcpStream::connect(addr)?;
+		eprintln!("Client successfully connected");
+		client.write_all(TO_SEND)?;
+		let mut buf = [0u8; TO_SEND.len()];
+		client.read_exact(&mut buf)?;
+		assert_eq!(&buf, TO_SEND);
+		Ok(())
+	});
+
+	let listener = TcpListener::bind(addr)?;
+	eprintln!("Listening on {addr}");
+	let (socket, socket_addr) = listener.accept()?;
+	eprintln!("Accepted connection from {socket_addr}");
+	handle_client(socket)?;
+
+	t.join().unwrap()
+}

examples/loopback/src/main.rs

@@ -50,6 +50,7 @@ instrument = []
 
 libc = []
 mmap = []
+net = []
 pci = []
 pci-ids = ["pci"]
 

hermit/Cargo.toml

@@ -123,6 +123,7 @@ impl KernelSrc {
 				"idle-poll",
 				"log-target",
 				"mmap",
+				"net",
 				"pci",
 				"pci-ids",
 				"rtl8139",