python · freakboy3742 · Jun 5, 2026 · Jun 5, 2026
diff --git a/Lib/test/test_platform.py b/Lib/test/test_platform.py
@@ -534,7 +534,7 @@ def test_ios_ver(self):

    def test_libc_ver(self):
        if support.is_emscripten:
-            assert platform.libc_ver() == ("emscripten", "4.0.12")
+            assert platform.libc_ver() == ("emscripten", "4.0.19")
            return
        # check that libc_ver(executable) doesn't raise an exception
        if os.path.isdir(sys.executable) and \

@@ -1,7 +1,7 @@
 # Any data that can vary between Python versions is to be kept in this file.
 # This allows for blanket copying of the Emscripten build code between supported
 # Python versions.
-emscripten-version = "4.0.12"
+emscripten-version = "4.0.19"
 node-version = "24"
 test-args = [
    "-m", "test",

@@ -112,7 +112,7 @@ const prepareBuffer = (buffer, offset, length) =>

 const TTY_OPS = {
  ioctl_tiocgwinsz(tty) {
-    return tty.devops.ioctl_tiocgwinsz?.();
+    return tty.devops.ioctl_tiocgwinsz?.() ?? [24, 80];
  },
 };

@@ -188,6 +188,10 @@ class NodeReader {
  fsync() {
    nodeFsync(this.nodeStream.fd);
  }
+
+  ioctl_tiocgwinsz() {
+    return [this.nodeStream.rows ?? 24, this.nodeStream.columns ?? 80];
+  }
 }

 class NodeWriter {