From e419429616d8bcc3687ede7cf13fcfe074cc1ad2 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 26 Nov 2025 14:57:39 -0500
Subject: [PATCH] StdIo: Restore Windows Console I/O modes on Ctrl-C

Extend commit fb3e7825f3 (StdIo: Restore Windows Console I/O modes on
exit, 2025-05-23, v4.1.0-rc1~114^2) to cover termination by Ctrl-C.

Fixes: #27427
---
 Source/cmStdIoInit.cxx   | 17 +++++++++++++++++
 Source/cmStdIoStream.cxx |  6 ++++++
 Source/cmStdIoStream.h   |  5 +++++
 3 files changed, 28 insertions(+)

diff --git a/Source/cmStdIoInit.cxx b/Source/cmStdIoInit.cxx
index 8c834f2dc9..a2fc50db7f 100644
--- a/Source/cmStdIoInit.cxx
+++ b/Source/cmStdIoInit.cxx
@@ -91,9 +91,26 @@ public:
   OStream StdOut{ std::cout, stdout };
   OStream StdErr{ std::cerr, stderr };
 
+  Globals();
+
   static Globals& Get();
 };
 
+#ifdef _WIN32
+Globals::Globals()
+{
+  static auto const ctrlHandler = [](DWORD /*dwCtrlType*/) -> BOOL {
+    Get().StdErr.Destroy();
+    Get().StdOut.Destroy();
+    Get().StdIn.Destroy();
+    return FALSE;
+  };
+  SetConsoleCtrlHandler(ctrlHandler, TRUE);
+}
+#else
+Globals::Globals() = default;
+#endif
+
 Globals& Globals::Get()
 {
   static Globals globals;
diff --git a/Source/cmStdIoStream.cxx b/Source/cmStdIoStream.cxx
index b1cb19c0df..baea8dfcbe 100644
--- a/Source/cmStdIoStream.cxx
+++ b/Source/cmStdIoStream.cxx
@@ -145,10 +145,16 @@ Stream::Stream(std::ios& s, FILE* file, Direction direction)
 
 #ifdef _WIN32
 Stream::~Stream()
+{
+  this->Destroy();
+}
+
+void Stream::Destroy()
 {
   if (this->Console_) {
     this->IOS_.rdbuf()->pubsync();
     SetConsoleMode(this->Console_, this->ConsoleOrigMode_);
+    this->Console_ = nullptr;
   }
 }
 #else
diff --git a/Source/cmStdIoStream.h b/Source/cmStdIoStream.h
index 8ff84f93cf..f94fa22d9f 100644
--- a/Source/cmStdIoStream.h
+++ b/Source/cmStdIoStream.h
@@ -30,6 +30,11 @@ enum class TermKind
  */
 class Stream
 {
+#ifdef _WIN32
+  friend class Globals;
+  void Destroy();
+#endif
+
 public:
   /** The kind of terminal to which the stream is attached, if any.  */
   TermKind Kind() const { return this->Kind_; }