1 files changed, 74 insertions, 0 deletions
diff --git a/toolkit/components/ctypes/tests/unit/test_errno.js b/toolkit/components/ctypes/tests/unit/test_errno.js
new file mode 100644
index 0000000000..24dba0597b
--- /dev/null
+++ b/toolkit/components/ctypes/tests/unit/test_errno.js
@@ -0,0 +1,74 @@
+// Scope used to relaunch the tests with |ctypes| opened in a limited scope.
+var ctypes = ctypes;
+
+function run_test() {
+  // Launch the test with regular loading of ctypes.jsm
+  main_test();
+
+  // Relaunch the test with exotic loading of ctypes.jsm
+  Cu.unload("resource://gre/modules/ctypes.jsm");
+  let scope = ChromeUtils.importESModule(
+    "resource://gre/modules/ctypes.sys.mjs"
+  );
+  ctypes = scope.ctypes;
+  main_test();
+}
+
+function main_test() {
+  "use strict";
+  let library = open_ctypes_test_lib();
+  let set_errno = library.declare(
+    "set_errno",
+    ctypes.default_abi,
+    ctypes.void_t,
+    ctypes.int
+  );
+  let get_errno = library.declare("get_errno", ctypes.default_abi, ctypes.int);
+
+  for (let i = 50; i >= 0; --i) {
+    set_errno(i);
+    let status = ctypes.errno;
+    Assert.equal(status, i);
+
+    status = get_errno();
+    Assert.equal(status, 0);
+
+    status = ctypes.errno;
+    Assert.equal(status, 0);
+  }
+
+  let set_last_error, get_last_error;
+  try {
+    // The following test is Windows-specific
+    set_last_error = library.declare(
+      "set_last_error",
+      ctypes.default_abi,
+      ctypes.void_t,
+      ctypes.int
+    );
+    get_last_error = library.declare(
+      "get_last_error",
+      ctypes.default_abi,
+      ctypes.int
+    );
+  } catch (x) {
+    Assert.equal(ctypes.winLastError, undefined);
+  }
+
+  if (set_last_error) {
+    Assert.notEqual(ctypes.winLastError, undefined);
+    for (let i = 0; i < 50; ++i) {
+      set_last_error(i);
+      let status = ctypes.winLastError;
+      Assert.equal(status, i);
+
+      status = get_last_error();
+      Assert.equal(status, 0);
+
+      status = ctypes.winLastError;
+      Assert.equal(status, 0);
+    }
+  }
+
+  library.close();
+}