src: remove kFlagNoShutdown flag

This was originally introduced in 3446ff4, in order to fix
a hard crash. However, since the libuv 1.18.0 update, that hard
crash is gone, and since f2b9805 we do not throw an
error in JS land anymore either, rendering the flag unnecessary.

Also, the original test that checked this condition was added
to `test/parallel/`. Since that typically runs without a TTY stdin,
a duplicate test is being added to the pseudo-tty test suite
in this commit.

Refs: 3446ff4
Refs: f2b9805
Refs: libuv/libuv@0e28141

src/stream_base-inl.h

@@ -335,8 +335,7 @@ void StreamBase::AddMethods(Environment* env,
 
   env->SetProtoMethod(t, "readStart", JSMethod<Base, &StreamBase::ReadStartJS>);
   env->SetProtoMethod(t, "readStop", JSMethod<Base, &StreamBase::ReadStopJS>);
-  if ((flags & kFlagNoShutdown) == 0)
-    env->SetProtoMethod(t, "shutdown", JSMethod<Base, &StreamBase::Shutdown>);
+  env->SetProtoMethod(t, "shutdown", JSMethod<Base, &StreamBase::Shutdown>);
   if ((flags & kFlagHasWritev) != 0)
     env->SetProtoMethod(t, "writev", JSMethod<Base, &StreamBase::Writev>);
   env->SetProtoMethod(t,

src/stream_base.h

@@ -257,8 +257,7 @@ class StreamBase : public StreamResource {
  public:
   enum Flags {
     kFlagNone = 0x0,
-    kFlagHasWritev = 0x1,
-    kFlagNoShutdown = 0x2
+    kFlagHasWritev = 0x1
   };
 
   template <class Base>

src/tty_wrap.cc

@@ -61,7 +61,7 @@ void TTYWrap::Initialize(Local<Object> target,
   env->SetProtoMethod(t, "ref", HandleWrap::Ref);
   env->SetProtoMethod(t, "hasRef", HandleWrap::HasRef);
 
-  LibuvStreamWrap::AddMethods(env, t, StreamBase::kFlagNoShutdown);
+  LibuvStreamWrap::AddMethods(env, t);
 
   env->SetProtoMethod(t, "getWindowSize", TTYWrap::GetWindowSize);
   env->SetProtoMethod(t, "setRawMode", SetRawMode);

test/pseudo-tty/test-tty-stdin-end.js

@@ -0,0 +1,7 @@
+'use strict';
+require('../common');
+
+// This test ensures that Node.js doesn't crash on `process.stdin.emit("end")`.
+// https://github.com/nodejs/node/issues/1068
+
+process.stdin.emit('end');

test/pseudo-tty/test-tty-stdin-end.out

@@ -0,0 +1 @@
+