From db3137ccb5d3c7499a665d17abf84cf523146cbf Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Tue, 14 Oct 2003 09:21:55 +0000
Subject: [PATCH] 	* exceptions.cc (ctrl_c_handler): Don't send SIGHUP on
 	CTRL_LOGOFF_EVENT to processes running in invisible Windows Stations. 
 * window.cc (has_visible_window_station): New function. 	* winsup.h:
 Add declaration for has_visible_window_station.

---
 winsup/cygwin/ChangeLog     |  7 +++++++
 winsup/cygwin/exceptions.cc | 22 +++++++++++++++++-----
 winsup/cygwin/window.cc     | 20 ++++++++++++++++++++
 winsup/cygwin/winsup.h      |  2 ++
 4 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index f106d3fe5..c832d9f9e 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,10 @@
+2003-10-14  Corinna Vinschen  <corinna@vinschen.de>
+
+	* exceptions.cc (ctrl_c_handler): Don't send SIGHUP on
+	CTRL_LOGOFF_EVENT to processes running in invisible Windows Stations.
+	* window.cc (has_visible_window_station): New function.
+	* winsup.h: Add declaration for has_visible_window_station.
+
 2003-10-10  Christopher Faylor  <cgf@redhat.com>
 
 	* fhandler_tty.cc (fhandler_tty_slave::open): Don't create a new window
diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
index 24b452be7..65d57b361 100644
--- a/winsup/cygwin/exceptions.cc
+++ b/winsup/cygwin/exceptions.cc
@@ -12,6 +12,8 @@ details. */
 #include <imagehlp.h>
 #include <stdlib.h>
 #include <setjmp.h>
+#include <wingdi.h>
+#include <winuser.h>
 
 #include "exceptions.h"
 #include "sync.h"
@@ -919,13 +921,23 @@ ctrl_c_handler (DWORD type)
       return FALSE;
     }
 
-  if (myself->ctty != -1
-      && (type == CTRL_CLOSE_EVENT || (!saw_close && type == CTRL_LOGOFF_EVENT)))
+  if (myself->ctty != -1)
     {
       if (type == CTRL_CLOSE_EVENT)
-	saw_close = true;
-      sig_send (NULL, SIGHUP);
-      return FALSE;
+        {
+	  saw_close = true;
+	  sig_send (NULL, SIGHUP);
+	  return FALSE;
+	}
+      if (!saw_close && type == CTRL_LOGOFF_EVENT)
+        {
+	  /* Check if the process is actually associated with a visible
+	     window station, one which actually represents a visible desktop.
+	     If not, the CTRL_LOGOFF_EVENT doesn't concern this process. */
+	  if (has_visible_window_station ())
+	    sig_send (NULL, SIGHUP);
+	  return FALSE;
+	}
     }
 
   /* If we are a stub and the new process has a pinfo structure, let it
diff --git a/winsup/cygwin/window.cc b/winsup/cygwin/window.cc
index ea9ed6e04..3f9462509 100644
--- a/winsup/cygwin/window.cc
+++ b/winsup/cygwin/window.cc
@@ -247,3 +247,23 @@ ualarm (useconds_t value, useconds_t interval)
   return (otimer.it_value.tv_sec * 1000000) + otimer.it_value.tv_usec;
 }
 
+bool
+has_visible_window_station (void)
+{
+  HWINSTA station_hdl;
+  USEROBJECTFLAGS uof;
+  DWORD len;
+
+  /* Check if the process is associated with a visible window station.
+     These are processes running on the local desktop as well as processes
+     running in terminal server sessions.
+     Processes running in a service session not explicitely associated
+     with the desktop (using the "Allow service to interact with desktop"
+     property) are running in an invisible window station. */
+  if ((station_hdl = GetProcessWindowStation ())
+      && GetUserObjectInformationA (station_hdl, UOI_FLAGS, &uof,
+				    sizeof uof, &len)
+      && (uof.dwFlags & WSF_VISIBLE))
+    return true;
+  return false;
+}
diff --git a/winsup/cygwin/winsup.h b/winsup/cygwin/winsup.h
index 5a6f65dc9..745519ea1 100644
--- a/winsup/cygwin/winsup.h
+++ b/winsup/cygwin/winsup.h
@@ -200,6 +200,8 @@ void __stdcall close_all_files (void);
 
 /* Invisible window initialization/termination. */
 HWND __stdcall gethwnd (void);
+/* Check if running in a visible window station. */
+extern bool has_visible_window_station (void);
 
 /* Globals that handle initialization of winsock in a child process. */
 extern HANDLE wsock32_handle;