Try #416:

.circleci/config.yml

@@ -89,7 +89,7 @@ jobs:
       - restore_cache:
           keys:
             - v8-cargo-cache-darwin-stable-{{ arch }}-{{ checksum "Cargo.lock" }}
-            - v8-cargo-cache-darwin-stable-{{ arch }}
+            # - v8-cargo-cache-darwin-stable-{{ arch }}
       - run:
           name: Install crate dependencies
           command: |
@@ -372,7 +372,6 @@ jobs:
                     -d build_parameters[CIRCLE_JOB]=bench \
                     https://circleci.com/api/v1.1/project/github/wasmerio/wasmer-bench/tree/master
             fi
-
 workflows:
   version: 2
   main:

Cargo.toml

@@ -19,6 +19,7 @@ include = [
 ]
 
 [dependencies]
+byteorder = "1.3.1"
 errno = "0.2.4"
 structopt = "0.2.11"
 wabt = "0.7.2"
@@ -32,9 +33,10 @@ wasmer-runtime-core = { path = "lib/runtime-core" }
 wasmer-emscripten = { path = "lib/emscripten" }
 wasmer-llvm-backend = { path = "lib/llvm-backend", optional = true }
 wasmer-wasi = { path = "lib/wasi", optional = true }
+wasmer-kernel-loader = { path = "lib/kernel-loader", optional = true }
 
 [workspace]
-members = ["lib/clif-backend", "lib/singlepass-backend", "lib/runtime", "lib/runtime-abi", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler", "lib/runtime-c-api", "lib/llvm-backend", "lib/wasi", "lib/middleware-common", "examples/plugin-for-example"]
+members = ["lib/clif-backend", "lib/singlepass-backend", "lib/runtime", "lib/runtime-abi", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler", "lib/runtime-c-api", "lib/llvm-backend", "lib/wasi", "lib/middleware-common", "lib/kernel-loader", "lib/kernel-net", "examples/plugin-for-example"]
 
 [build-dependencies]
 wabt = "0.7.2"
@@ -43,6 +45,7 @@ rustc_version = "0.2.3"
 
 [features]
 default = ["fast-tests", "wasi"]
+"loader:kernel" = ["wasmer-kernel-loader"]
 debug = ["wasmer-runtime-core/debug"]
 extra-debug = ["wasmer-clif-backend/debug", "wasmer-runtime-core/debug"]
 # This feature will allow cargo test to run much faster

Makefile

@@ -67,27 +67,27 @@ test-emscripten-singlepass:
 	cargo test --manifest-path lib/emscripten/Cargo.toml --features singlepass -- --test-threads=1 $(runargs)
 
 singlepass-debug-release:
-	cargo +nightly build --features "backend:singlepass debug" --release
+	cargo +nightly build --features backend:singlepass,debug --release
 
 singlepass-release:
-	cargo +nightly build --features "backend:singlepass" --release
+	cargo +nightly build --features backend:singlepass --release
 
 singlepass-build:
-	cargo +nightly build --features "backend:singlepass debug"
+	cargo +nightly build --features backend:singlepass,debug
 
 release:
 	# If you are in OS-X, you will need mingw-w64 for cross compiling to windows
 	# brew install mingw-w64
 	cargo build --release
 
 production-release:
-	cargo build --release --features backend:singlepass,backend:llvm
+	cargo build --release --features backend:singlepass,backend:llvm,loader:kernel
 
 debug-release:
-	cargo build --release --features "debug"
+	cargo build --release --features debug
 
 extra-debug-release:
-	cargo build --release --features "extra-debug"
+	cargo build --release --features extra-debug
 
 publish-release:
 	ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${VERSION} ./artifacts/

examples/echo-server/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "echo-server"
+version = "0.1.0"
+authors = ["Heyang Zhou <[email protected]>"]
+edition = "2018"
+
+[workspace]
+
+[dependencies]
+kernel-net = { path = "../../lib/kernel-net" }

examples/echo-server/src/main.rs

@@ -0,0 +1,49 @@
+#![feature(wasi_ext)]
+
+use kernel_net::{schedule, Epoll, Tcp4Listener, TcpStream};
+use std::sync::Arc;
+
+fn do_echo(stream: Arc<TcpStream>, buf: Vec<u8>) {
+    let stream2 = stream.clone();
+    stream.read_async(buf, move |result| match result {
+        Ok(buf) => {
+            if buf.len() == 0 {
+                return;
+            }
+            let stream = stream2.clone();
+            stream2.write_all_async(buf, move |result| match result {
+                Ok(buf) => {
+                    schedule(|| {
+                        do_echo(stream, buf);
+                    });
+                }
+                Err(code) => {
+                    println!("failed to write; code = {}", code);
+                }
+            });
+        }
+        Err(code) => {
+            println!("failed to read; code = {}", code);
+        }
+    });
+}
+
+fn main() {
+    let epoll = Arc::new(Epoll::new());
+    let listener = Arc::new(Tcp4Listener::new("0.0.0.0", 2001, 128).unwrap());
+
+    listener.accept_async(epoll.clone(), |stream| match stream {
+        Ok(stream) => {
+            do_echo(stream, Vec::with_capacity(16384));
+            Ok(())
+        }
+        Err(code) => {
+            println!("failed to accept; code = {}", code);
+            Err(())
+        }
+    });
+    println!("start epoll");
+    unsafe {
+        epoll.run();
+    }
+}

examples/http-server/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "http-server"
+version = "0.1.0"
+authors = ["Heyang Zhou <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[workspace]
+
+[dependencies]
+kernel-net = { path = "../../lib/kernel-net" }

examples/http-server/src/main.rs

@@ -0,0 +1,72 @@
+#![feature(wasi_ext)]
+
+use kernel_net::{schedule, Epoll, Tcp4Listener, TcpStream};
+use std::sync::Arc;
+
+fn serve(stream: Arc<TcpStream>, mut all: Vec<u8>) {
+    let stream2 = stream.clone();
+    stream.read_async(
+        Vec::with_capacity(512),
+        move |result| {
+            match result {
+                Ok(buf) => {
+                    if buf.len() == 0 {
+                        return;
+                    }
+                    all.extend_from_slice(&buf);
+                    if all.len() > 4096 {
+                        println!("header too large");
+                        return;
+                    }
+                    let s = match ::std::str::from_utf8(&all) {
+                        Ok(x) => x,
+                        Err(e) => {
+                            println!("not utf8: {:?}", e);
+                            return;
+                        }
+                    };
+                    if let Some(_pos) = s.find("\r\n\r\n") {
+                        let body = format!(
+                            "Hello, world!\n",
+                        ).into_bytes();
+                        let stream = stream2.clone();
+                        stream2.write_all_async(
+                            format!(
+                                "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nConnection: close\r\nContent-Length: {}\r\n\r\n",
+                                body.len()
+                            ).into_bytes(),
+                            |_| {
+                                stream.write_all_async(body, |_| {});
+                            }
+                        );
+                    } else {
+                        schedule(|| serve(stream2, all));
+                    }
+                }
+                Err(code) => {
+                    println!("failed to read; code = {}", code);
+                }
+            }
+        }
+    );
+}
+
+fn main() {
+    let epoll = Arc::new(Epoll::new());
+    let listener = Arc::new(Tcp4Listener::new("0.0.0.0", 2011, 128).unwrap());
+
+    listener.accept_async(epoll.clone(), |stream| match stream {
+        Ok(stream) => {
+            serve(stream, vec![]);
+            Ok(())
+        }
+        Err(code) => {
+            println!("failed to accept; code = {}", code);
+            Err(())
+        }
+    });
+    println!("start epoll");
+    unsafe {
+        epoll.run();
+    }
+}

examples/pipe/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "pipe"
+version = "0.1.0"
+authors = ["Heyang Zhou <[email protected]>"]
+edition = "2018"
+
+[workspace]
+
+[dependencies]

examples/pipe/src/main.rs

@@ -0,0 +1,13 @@
+use std::io::{Read, Write};
+
+fn main() {
+    let mut stdin = ::std::io::stdin();
+    let mut stdout = ::std::io::stdout();
+    let mut buf: Vec<u8> = vec![0; 512];
+    let mut total: u64 = 0;
+    while total < 1048576u64 * 2048 {
+        let n = stdin.read(&mut buf).unwrap();
+        stdout.write_all(&buf[..n]).unwrap();
+        total += n as u64;
+    }
+}

lib/kernel-loader/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "wasmer-kernel-loader"
+version = "0.1.0"
+authors = ["Heyang Zhou <[email protected]>"]
+edition = "2018"
+
+[dependencies]
+libc = "0.2.49"
+wasmer-runtime-core = { path = "../runtime-core" }