Ensure that stdin/stdout/stderr are not mapped 1:1 under NODERAWFS

src/library_noderawfs.js

@@ -7,7 +7,19 @@
 addToLibrary({
   $NODERAWFS__deps: ['$ERRNO_CODES', '$FS', '$NODEFS', '$mmapAlloc', '$FS_modeStringToFlags'],
   $NODERAWFS__postset: `
-    if (ENVIRONMENT_IS_NODE) {
+    if (!ENVIRONMENT_IS_NODE) {
+      throw new Error("NODERAWFS is currently only supported on Node.js environment.")
+    }
+    // Use this to reference our in-memory filesystem
+    var VFS = Object.assign({}, FS);
+    // Override the init function with our own
+    FS.init = NODERAWFS.init;`,
+  $NODERAWFS: {
+    init(input, output, error) {
+      // Call the original FS.init, this will setup the
+      // stdin, stdout and stderr devices
+      VFS.init(input, output, error);
+
       var _wrapNodeError = function(func) {
         return function(...args) {
           try {
@@ -20,15 +32,14 @@ addToLibrary({
           }
         }
       };
-      /** @suppress {partialAlias} */
-      var VFS = Object.assign({}, FS);
+
+      // Wrap the whole in-memory filesystem API with
+      // our Node.js based functions
       for (var _key in NODERAWFS) {
+        /** @suppress {partialAlias} */
         FS[_key] = _wrapNodeError(NODERAWFS[_key]);
       }
-    } else {
-      throw new Error("NODERAWFS is currently only supported on Node.js environment.")
-    }`,
-  $NODERAWFS: {
+    },
     lookup(parent, name) {
 #if ASSERTIONS
       assert(parent)
@@ -44,12 +55,6 @@ addToLibrary({
       var mode = NODEFS.getMode(path);
       return { path, node: { id: st.ino, mode, node_ops: NODERAWFS, path }};
     },
-    createStandardStreams() {
-      FS.createStream({ nfd: 0, position: 0, path: '', flags: 0, tty: true, seekable: false }, 0);
-      for (var i = 1; i < 3; i++) {
-        FS.createStream({ nfd: i, position: 0, path: '', flags: 577, tty: true, seekable: false }, i);
-      }
-    },
     // generic function for all node creation
     cwd() { return process.cwd(); },
     chdir(...args) { process.chdir(...args); },

test/test_other.py

@@ -1689,6 +1689,38 @@ def test_stdin(self, args):
         os.system(f'cat in.txt | {cmd} > out.txt')
       self.assertContained('abcdef\nghijkl\neof', read_file('out.txt'))
 
+  @also_with_noderawfs
+  @crossplatform
+  def test_module_stdin(self):
+    self.set_setting('FORCE_FILESYSTEM')
+    self.set_setting('EXIT_RUNTIME')
+    create_file('pre.js', '''
+const data = 'hello, world!\\n'.split('').map(c => c.charCodeAt(0));
+Module['stdin'] = () => data.shift() || null;
+''')
+    self.emcc_args += ['--pre-js', 'pre.js']
+    self.do_runf('module/test_stdin.c', 'hello, world!')
+
+  @also_with_noderawfs
+  @crossplatform
+  def test_module_stdout_stderr(self):
+    self.set_setting('FORCE_FILESYSTEM')
+    create_file('pre.js', '''
+let stdout = '';
+let stderr = '';
+
+Module['print'] = (text) => stdout += text;
+Module['printErr'] = (text) => stderr += text;
+Module['postRun'] = () => {
+    assert(stderr == '', 'stderr should be empty. \\n' +
+        'stderr: \\n' + stderr);
+    assert(stdout.startsWith('hello, world!'), 'stdout should start with the famous greeting. \\n' +
+        'stdout: \\n' + stdout);
+}
+''')
+    self.emcc_args += ['--pre-js', 'pre.js']
+    self.do_runf('hello_world.c')
+
   def test_ungetc_fscanf(self):
     create_file('main.c', r'''
       #include <stdio.h>
@@ -9778,6 +9810,7 @@ def test_ioctl(self):
     # ioctl requires filesystem
     self.do_other_test('test_ioctl.c', emcc_args=['-sFORCE_FILESYSTEM'])
 
+  @also_with_noderawfs
   def test_ioctl_termios(self):
     # ioctl requires filesystem
     self.do_other_test('test_ioctl_termios.c', emcc_args=['-sFORCE_FILESYSTEM'])