Rust & Zig

.gitignore

@@ -90,3 +90,5 @@ clion*
 /CUDSClient/cmake-build-debug/CMakeFiles/TargetDirectories.txt
 /CUDSClient/cmake-build-debug/CMakeFiles/CMakeConfigureLog.yaml
 *.c.o
+
+**/.zig-cache/**

CUDSClient/main.c

@@ -3,7 +3,6 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
-#define CLIENT_SOCK_FILE "/tmp/cclient.sock"
 #define SERVER_SOCK_FILE "/tmp/udsserver.sock"
 
 int main(void) {
@@ -26,7 +25,5 @@ int main(void) {
         perror("Unable to connect") ;
     }
 
-
-    unlink (CLIENT_SOCK_FILE);
     return 0;
 }

JavaUDSClient/src/main/java/nu/zoom/checked/client/Main.java

@@ -15,21 +15,30 @@ public class Main {
         new Main().run();
     }
 
-    private void run() throws IOException {
+    private void run() {
         try (var clientChannel = SocketChannel.open(StandardProtocolFamily.UNIX)) {
             var serverPath = Path.of("/tmp").resolve("udsserver.sock") ;
             var serverAddress = UnixDomainSocketAddress.of(serverPath);
             clientChannel.connect(serverAddress);
 
-            var clientMessage = "quit från - " + UUID.randomUUID();
+            var clientMessage = "Hello world from Java";
 
-            sendMessage(clientMessage, clientChannel);
+            var messageBytes = clientMessage.getBytes(StandardCharsets.UTF_8);
+            var messageBuffer = ByteBuffer.allocate(400);
+            messageBuffer.put((byte) messageBytes.length);
+            messageBuffer.put(messageBytes);
+            messageBuffer.flip();
+            while  (messageBuffer.hasRemaining()) {
+                clientChannel.write(messageBuffer);
+            }
+        } catch (IOException e) {
+			e.printStackTrace();
 		}
 	}
 
     private static void sendMessage(String clientMessage, SocketChannel clientChannel) throws IOException {
         var messageBytes = clientMessage.getBytes(StandardCharsets.UTF_8);
-        var messageBuffer = ByteBuffer.allocate(500);
+        var messageBuffer = ByteBuffer.allocate(400);
         messageBuffer.put((byte) messageBytes.length);
         messageBuffer.put(messageBytes);
         messageBuffer.flip();

RustUDSClient/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "RustUDSClient"
+version = "0.1.0"

RustUDSClient/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "RustUDSClient"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

RustUDSClient/src/main.rs

@@ -0,0 +1,19 @@
+use std::io::Write;
+use std::os::unix::net::UnixStream;
+
+fn main() {
+    let socket = "/tmp/udsserver.sock";
+    let stream_result = UnixStream::connect(socket);
+    match stream_result {
+        Ok(mut stream) => {
+            let message = "Hello, World from RUST™️!";
+            let mut size_buf = [0u8] ;
+            size_buf[0] = message.len() as u8;
+            stream.write(size_buf.as_slice()).unwrap();
+            stream.write_all(message.as_bytes()).unwrap();
+        }
+        Err(e) => {
+            println!("Error: {}", e);
+        }
+    }
+}

ZigUDSClient/main.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#define SERVER_SOCK_FILE "/tmp/udsserver.sock"
+
+int main(void) {
+    struct sockaddr_un server_addr = {};
+    server_addr.sun_family = AF_UNIX;
+    strcpy(server_addr.sun_path, SERVER_SOCK_FILE); // XXX: should be limited to about 104 characters, system dependent
+
+    // get socket
+    int sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
+
+    if (connect(sockfd, (struct sockaddr *) &server_addr, sizeof(server_addr)) > -1) {
+        unsigned char messageBuffer[500] = {};
+        const char* message = "Hello from C";
+        size_t messageLengthInBytes = strlen(message);
+        messageBuffer[0] = messageLengthInBytes;
+        // Lucky for us the message just happens to be compatible  with UTF-8 encoding
+        strcpy((char *)messageBuffer+1, message);
+        send(sockfd, messageBuffer, messageLengthInBytes+1, 0);
+    } else {
+        perror("Unable to connect") ;
+    }
+
+    return 0;
+}

zigUDSClient/build.zig

@@ -0,0 +1,66 @@
+const std = @import("std");
+
+// Although this function looks imperative, note that its job is to
+// declaratively construct a build graph that will be executed by an external
+// runner.
+pub fn build(b: *std.Build) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    // Standard optimization options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
+    // set a preferred release mode, allowing the user to decide how to optimize.
+    const optimize = b.standardOptimizeOption(.{});
+
+    const exe = b.addExecutable(.{
+        .name = "zigUDSClient",
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    // This declares intent for the executable to be installed into the
+    // standard location when the user invokes the "install" step (the default
+    // step when running `zig build`).
+    b.installArtifact(exe);
+
+    // This *creates* a Run step in the build graph, to be executed when another
+    // step is evaluated that depends on it. The next line below will establish
+    // such a dependency.
+    const run_cmd = b.addRunArtifact(exe);
+
+    // By making the run step depend on the install step, it will be run from the
+    // installation directory rather than directly from within the cache directory.
+    // This is not necessary, however, if the application depends on other installed
+    // files, this ensures they will be present and in the expected location.
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    // This allows the user to pass arguments to the application in the build
+    // command itself, like this: `zig build run -- arg1 arg2 etc`
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    // This creates a build step. It will be visible in the `zig build --help` menu,
+    // and can be selected like this: `zig build run`
+    // This will evaluate the `run` step rather than the default, which is "install".
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    const exe_unit_tests = b.addTest(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
+
+    // Similar to creating the run step earlier, this exposes a `test` step to
+    // the `zig build --help` menu, providing a way for the user to request
+    // running the unit tests.
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_exe_unit_tests.step);
+}

zigUDSClient/build.zig.zon

@@ -0,0 +1,67 @@
+.{
+    .name = "zigUDSClient",
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
+    .version = "0.0.0",
+
+    // This field is optional.
+    // This is currently advisory only; Zig does not yet do anything
+    // with this value.
+    //.minimum_zig_version = "0.11.0",
+
+    // This field is optional.
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        // See `zig fetch --save <url>` for a command-line interface for adding dependencies.
+        //.example = .{
+        //    // When updating this field to a new URL, be sure to delete the corresponding
+        //    // `hash`, otherwise you are communicating that you expect to find the old hash at
+        //    // the new URL.
+        //    .url = "https://example.com/foo.tar.gz",
+        //
+        //    // This is computed from the file contents of the directory of files that is
+        //    // obtained after fetching `url` and applying the inclusion rules given by
+        //    // `paths`.
+        //    //
+        //    // This field is the source of truth; packages do not come from a `url`; they
+        //    // come from a `hash`. `url` is just one of many possible mirrors for how to
+        //    // obtain a package matching this `hash`.
+        //    //
+        //    // Uses the [multihash](https://multiformats.io/multihash/) format.
+        //    .hash = "...",
+        //
+        //    // When this is provided, the package is found in a directory relative to the
+        //    // build root. In this case the package's hash is irrelevant and therefore not
+        //    // computed. This field and `url` are mutually exclusive.
+        //    .path = "foo",
+
+        //    // When this is set to `true`, a package is declared to be lazily
+        //    // fetched. This makes the dependency only get fetched if it is
+        //    // actually used.
+        //    .lazy = false,
+        //},
+    },
+
+    // Specifies the set of files and directories that are included in this package.
+    // Only files and directories listed here are included in the `hash` that
+    // is computed for this package.
+    // Paths are relative to the build root. Use the empty string (`""`) to refer to
+    // the build root itself.
+    // A directory listed here means that all files within, recursively, are included.
+    .paths = .{
+        // This makes *all* files, recursively, included in this package. It is generally
+        // better to explicitly list the files and directories instead, to insure that
+        // fetching from tarballs, file system paths, and version control all result
+        // in the same contents hash.
+        "",
+        // For example...
+        //"build.zig",
+        //"build.zig.zon",
+        //"src",
+        //"LICENSE",
+        //"README.md",
+    },
+}

zigUDSClient/src/main.zig

@@ -0,0 +1,12 @@
+const std = @import("std");
+const net = std.net;
+
+pub fn main() !void {
+    if (net.connectUnixSocket("/tmp/udsserver.sock")) |stream| {
+        defer stream.close();
+        const msg = "Hello from Zig ⚡" ;
+        try stream.writeAll(msg);
+    } else |err| {
+        std.debug.print("Error connecting to socket: {}", .{err});
+    }
+}