Very partial implementation of BroadcastSystemMessageA.

include/winuser.h

@@ -1539,6 +1539,25 @@ typedef struct
 #define GCW_ATOM            (-32)
 #define GCL_HICONSM         (-34)
 
+/* BroadcastSystemMessage flags */
+#define BSM_ALLCOMPONENTS        0x00000000
+#define BSM_VXDS                 0x00000001
+#define BSM_NETDRIVER            0x00000002
+#define BSM_INSTALLABLEDRIVERS   0x00000004
+#define BSM_APPLICATIONS         0x00000008
+
+#define BSF_QUERY                0x00000001
+#define BSF_IGNORECURRENTTASK    0x00000002
+#define BSF_FLUSHDISK            0x00000004
+#define BSF_NOHANG               0x00000008
+#define BSF_POSTMESSAGE          0x00000010
+#define BSF_FORCEIFHUNG          0x00000020
+#define BSF_NOTIMEOUTIFNOTHUNG   0x00000040
+#define BSF_ALLOWSFW             0x00000080
+#define BSF_SENDNOTIFYMESSAGE    0x00000100
+#define BSF_RETURNHDESK          0x00000200
+#define BSF_LUID                 0x00000400
+
 
 /***** Window hooks *****/
 

windows/message.c

@@ -1201,10 +1201,20 @@ WORD WINAPI RegisterWindowMessageW( LPCWSTR str )
  */
 LONG WINAPI BroadcastSystemMessage(
 	DWORD dwFlags,LPDWORD recipients,UINT uMessage,WPARAM wParam,
-	LPARAM lParam
-) {
+	LPARAM lParam )
+{
+    if ((*recipients & BSM_APPLICATIONS)||
+        (*recipients == BSM_ALLCOMPONENTS))
+    {
+        FIXME("(%08lx,%08lx,%08x,%08x,%08lx): semi-stub!\n",
+              dwFlags,*recipients,uMessage,wParam,lParam);
+        PostMessageA(HWND_BROADCAST,uMessage,wParam,lParam);
+        return 1;
+    }
+    else
+    {
         FIXME("(%08lx,%08lx,%08x,%08x,%08lx): stub!\n",
-	      dwFlags,*recipients,uMessage,wParam,lParam
-	);
-	return 0;
+              dwFlags,*recipients,uMessage,wParam,lParam);
+        return -1;
+    }
 }