From a24e330b203a6b37987633ba03fc3b2e1c3a004f Mon Sep 17 00:00:00 2001
From: Alexandre Julliard <julliard@winehq.org>
Date: Thu, 28 Jan 2021 11:20:38 +0100
Subject: [PATCH] ntdll: Implement DbgUiConnectToDbg().

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/ntdll/ntdll.spec |  2 +-
 dlls/ntdll/process.c  | 16 ++++++++++++++++
 include/winternl.h    |  1 +
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 285b719f2d5..740030f2066 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -34,7 +34,7 @@
 @ stub DbgPrompt
 # @ stub DbgQueryDebugFilterState
 # @ stub DbgSetDebugFilterState
-@ stub DbgUiConnectToDbg
+@ stdcall DbgUiConnectToDbg()
 @ stub DbgUiContinue
 @ stub DbgUiConvertStateChangeStructure
 # @ stub DbgUiDebugActiveProcess
diff --git a/dlls/ntdll/process.c b/dlls/ntdll/process.c
index d8280277418..c52f00d123e 100644
--- a/dlls/ntdll/process.c
+++ b/dlls/ntdll/process.c
@@ -134,6 +134,22 @@ void WINAPI DbgUiSetThreadDebugObject( HANDLE handle )
     NtCurrentTeb()->DbgSsReserved[1] = handle;
 }
 
+/***********************************************************************
+ *      DbgUiConnectToDbg (NTDLL.@)
+ */
+NTSTATUS WINAPI DbgUiConnectToDbg(void)
+{
+    HANDLE handle;
+    NTSTATUS status;
+    OBJECT_ATTRIBUTES attr = { sizeof(attr) };
+
+    if (DbgUiGetThreadDebugObject()) return STATUS_SUCCESS;  /* already connected */
+
+    status = NtCreateDebugObject( &handle, DEBUG_ALL_ACCESS, &attr, 0 );
+    if (!status) DbgUiSetThreadDebugObject( handle );
+    return status;
+}
+
 /***********************************************************************
  *      DbgUiRemoteBreakin (NTDLL.@)
  */
diff --git a/include/winternl.h b/include/winternl.h
index ac63567dad3..fc4792a194a 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -3020,6 +3020,7 @@ typedef struct _PS_CREATE_INFO
 NTSYSAPI void      WINAPI DbgBreakPoint(void);
 NTSYSAPI NTSTATUS WINAPIV DbgPrint(LPCSTR fmt, ...);
 NTSYSAPI NTSTATUS WINAPIV DbgPrintEx(ULONG iComponentId, ULONG Level, LPCSTR fmt, ...);
+NTSYSAPI NTSTATUS  WINAPI DbgUiConnectToDbg(void);
 NTSYSAPI HANDLE    WINAPI DbgUiGetThreadDebugObject(void);
 NTSYSAPI NTSTATUS  WINAPI DbgUiIssueRemoteBreakin(HANDLE);
 NTSYSAPI void      WINAPI DbgUiRemoteBreakin(void*);