[janderwald] 28905: - there can be only one instance of the device manager

Author: janderwald
Date: Thu Sep  6 23:45:26 2007
New Revision: 28905

URL: http://svn.reactos.org/svn/reactos?rev=28905&view=rev
Log:
- there can be only one instance of the device manager

Modified:
    trunk/reactos/base/applications/mscutils/devmgmt/devmgmt.c

Modified: trunk/reactos/base/applications/mscutils/devmgmt/devmgmt.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/base/applications/mscutils…
==============================================================================
--- trunk/reactos/base/applications/mscutils/devmgmt/devmgmt.c (original)
+++ trunk/reactos/base/applications/mscutils/devmgmt/devmgmt.c Thu Sep  6 23:45:26 2007
@@ -11,6 +11,7 @@
 
 HINSTANCE hInstance;
 HANDLE ProcessHeap;
+HANDLE hMutex;
 
 int WINAPI
 _tWinMain(HINSTANCE hThisInstance,
@@ -23,6 +24,18 @@
     MSG Msg;
     int Ret = 1;
     INITCOMMONCONTROLSEX icex;
+
+    hMutex = CreateMutex(NULL, TRUE, _T("devmgmt_mutex"));
+    if (hMutex == NULL || GetLastError() == ERROR_ALREADY_EXISTS)
+    {
+        if (hMutex)
+        {
+            CloseHandle(hMutex);
+        }
+        return 0;
+    }
+
+
 
     hInstance = hThisInstance;
     ProcessHeap = GetProcessHeap();
@@ -59,7 +72,7 @@
     }
 
     LocalFree((HLOCAL)lpAppName);
-
+    CloseHandle(hMutex);
     return Ret;
 }