Support emscripten (#100)

* Add Emscripten support

* Add CI for emscripten target

Author: ChanTsune

.github/workflows/main.yml

@@ -51,6 +51,22 @@ jobs:
       - name: Test (all features)
         run: CARGO_TARGET_WASM32_WASI_RUNNER=wasmtime cargo test --target wasm32-wasi --all-features
 
+  emscripten:
+    name: Test Emscripten
+    runs-on: ubuntu-latest
+    container: emscripten/emsdk:latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          targets: wasm32-unknown-emscripten
+      - name: Test (no features)
+        run: CARGO_TARGET_WASM32_UNKNOWN_EMSCRIPTEN_RUNNER=node cargo test --target wasm32-unknown-emscripten --no-default-features
+      - name: Test (all features)
+        run: CARGO_TARGET_WASM32_UNKNOWN_EMSCRIPTEN_RUNNER=node cargo test --target wasm32-unknown-emscripten --all-features
+
 
   lints:
     name: Rustfmt & Clippy

src/lib.rs

@@ -120,7 +120,7 @@ fn check_description() {
         "Incorrect function."
     } else if cfg!(target_os = "illumos") {
         "Not owner"
-    } else if cfg!(target_os = "wasi") {
+    } else if cfg!(target_os = "wasi") || cfg!(target_os = "emscripten") {
         "Argument list too long"
     } else if cfg!(target_os = "haiku") {
         "Operation not allowed"

src/unix.rs

@@ -91,7 +91,8 @@ extern "C" {
             target_os = "linux",
             target_os = "hurd",
             target_os = "redox",
-            target_os = "dragonfly"
+            target_os = "dragonfly",
+            target_os = "emscripten",
         ),
         link_name = "__errno_location"
     )]