server: Return the desktop object locator in (get|set)_thread_desktop.

Approved-by: Huw Davies (@huw)
Approved-by: Jinoh Kang (@iamahuman)
Approved-by: Jacek Caban (@jacek)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/wine/-/merge_requests/3103

include/wine/server_protocol.h

@@ -900,6 +900,12 @@ typedef volatile struct
     object_shm_t         shm;
 } shared_object_t;
 
+typedef struct
+{
+    object_id_t          id;
+    mem_size_t           offset;
+} obj_locator_t;
+
 
 
 
@@ -3895,8 +3901,9 @@ struct get_thread_desktop_request
 struct get_thread_desktop_reply
 {
     struct reply_header __header;
-    obj_handle_t handle;
-    char __pad_12[4];
+    obj_locator_t  locator;
+    obj_handle_t   handle;
+    char __pad_28[4];
 };
 
 
@@ -3909,6 +3916,7 @@ struct set_thread_desktop_request
 struct set_thread_desktop_reply
 {
     struct reply_header __header;
+    obj_locator_t  locator;
 };
 
 
@@ -6552,7 +6560,7 @@ union generic_reply
 
 /* ### protocol_version begin ### */
 
-#define SERVER_PROTOCOL_VERSION 810
+#define SERVER_PROTOCOL_VERSION 811
 
 /* ### protocol_version end ### */
 

server/file.h

@@ -194,6 +194,7 @@ extern void set_session_mapping( struct mapping *mapping );
 
 extern const volatile void *alloc_shared_object(void);
 extern void free_shared_object( const volatile void *object_shm );
+extern obj_locator_t get_shared_object_locator( const volatile void *object_shm );
 
 #define SHARED_WRITE_BEGIN( object_shm, type )                          \
     do {                                                                \

server/mapping.c

@@ -1407,6 +1407,13 @@ void free_shared_object( const volatile void *object_shm )
     list_add_tail( &session.free_objects, &object->entry );
 }
 
+obj_locator_t get_shared_object_locator( const volatile void *object_shm )
+{
+    struct session_object *object = CONTAINING_RECORD( object_shm, struct session_object, obj.shm );
+    obj_locator_t locator = {.offset = object->offset, .id = object->obj.id};
+    return locator;
+}
+
 struct object *create_user_data_mapping( struct object *root, const struct unicode_str *name,
                                         unsigned int attr, const struct security_descriptor *sd )
 {

server/protocol.def

@@ -916,6 +916,12 @@ typedef volatile struct
     object_shm_t         shm;              /* object shared data */
 } shared_object_t;
 
+typedef struct
+{
+    object_id_t          id;               /* object unique id, object data is valid if != 0 */
+    mem_size_t           offset;           /* offset of the object in session shared memory */
+} obj_locator_t;
+
 /****************************************************************/
 /* Request declarations */
 
@@ -2813,13 +2819,16 @@ enum coords_relative
 @REQ(get_thread_desktop)
     thread_id_t  tid;             /* thread id */
 @REPLY
-    obj_handle_t handle;          /* handle to the desktop */
+    obj_locator_t  locator;       /* locator for the shared session object */
+    obj_handle_t   handle;        /* handle to the desktop */
 @END
 
 
 /* Set the thread current desktop */
 @REQ(set_thread_desktop)
     obj_handle_t handle;          /* handle to the desktop */
+@REPLY
+    obj_locator_t  locator;       /* locator for the shared session object */
 @END
 
 

server/request.h

@@ -721,6 +721,7 @@ C_ASSERT( sizeof(mem_size_t) == 8 );
 C_ASSERT( sizeof(message_data_t) == 48 );
 C_ASSERT( sizeof(mod_handle_t) == 8 );
 C_ASSERT( sizeof(obj_handle_t) == 4 );
+C_ASSERT( sizeof(obj_locator_t) == 16 );
 C_ASSERT( sizeof(object_id_t) == 8 );
 C_ASSERT( sizeof(pe_image_info_t) == 88 );
 C_ASSERT( sizeof(process_id_t) == 4 );
@@ -1745,10 +1746,13 @@ C_ASSERT( FIELD_OFFSET(struct close_desktop_request, handle) == 12 );
 C_ASSERT( sizeof(struct close_desktop_request) == 16 );
 C_ASSERT( FIELD_OFFSET(struct get_thread_desktop_request, tid) == 12 );
 C_ASSERT( sizeof(struct get_thread_desktop_request) == 16 );
-C_ASSERT( FIELD_OFFSET(struct get_thread_desktop_reply, handle) == 8 );
-C_ASSERT( sizeof(struct get_thread_desktop_reply) == 16 );
+C_ASSERT( FIELD_OFFSET(struct get_thread_desktop_reply, locator) == 8 );
+C_ASSERT( FIELD_OFFSET(struct get_thread_desktop_reply, handle) == 24 );
+C_ASSERT( sizeof(struct get_thread_desktop_reply) == 32 );
 C_ASSERT( FIELD_OFFSET(struct set_thread_desktop_request, handle) == 12 );
 C_ASSERT( sizeof(struct set_thread_desktop_request) == 16 );
+C_ASSERT( FIELD_OFFSET(struct set_thread_desktop_reply, locator) == 8 );
+C_ASSERT( sizeof(struct set_thread_desktop_reply) == 24 );
 C_ASSERT( FIELD_OFFSET(struct enum_desktop_request, winstation) == 12 );
 C_ASSERT( FIELD_OFFSET(struct enum_desktop_request, index) == 16 );
 C_ASSERT( sizeof(struct enum_desktop_request) == 24 );

server/trace.c

@@ -467,6 +467,14 @@ static void dump_hw_input( const char *prefix, const hw_input_t *input )
     }
 }
 
+static void dump_obj_locator( const char *prefix, const obj_locator_t *locator )
+{
+    fprintf( stderr, "%s{", prefix );
+    dump_uint64( "id=", &locator->id );
+    dump_uint64( ",offset=", &locator->offset );
+    fprintf( stderr, "}" );
+}
+
 static void dump_luid( const char *prefix, const struct luid *luid )
 {
     fprintf( stderr, "%s%d.%u", prefix, luid->high_part, luid->low_part );
@@ -3426,7 +3434,8 @@ static void dump_get_thread_desktop_request( const struct get_thread_desktop_req
 
 static void dump_get_thread_desktop_reply( const struct get_thread_desktop_reply *req )
 {
-    fprintf( stderr, " handle=%04x", req->handle );
+    dump_obj_locator( " locator=", &req->locator );
+    fprintf( stderr, ", handle=%04x", req->handle );
 }
 
 static void dump_set_thread_desktop_request( const struct set_thread_desktop_request *req )
@@ -3434,6 +3443,11 @@ static void dump_set_thread_desktop_request( const struct set_thread_desktop_req
     fprintf( stderr, " handle=%04x", req->handle );
 }
 
+static void dump_set_thread_desktop_reply( const struct set_thread_desktop_reply *req )
+{
+    dump_obj_locator( " locator=", &req->locator );
+}
+
 static void dump_enum_desktop_request( const struct enum_desktop_request *req )
 {
     fprintf( stderr, " winstation=%04x", req->winstation );
@@ -5101,7 +5115,7 @@ static const dump_func reply_dumpers[REQ_NB_REQUESTS] = {
     NULL,
     NULL,
     (dump_func)dump_get_thread_desktop_reply,
-    NULL,
+    (dump_func)dump_set_thread_desktop_reply,
     (dump_func)dump_enum_desktop_reply,
     (dump_func)dump_set_user_object_info_reply,
     (dump_func)dump_register_hotkey_reply,

server/winstation.c

@@ -742,10 +742,19 @@ DECL_HANDLER(close_desktop)
 /* get the thread current desktop */
 DECL_HANDLER(get_thread_desktop)
 {
+    struct desktop *desktop;
     struct thread *thread;
 
     if (!(thread = get_thread_from_id( req->tid ))) return;
     reply->handle = thread->desktop;
+
+    if (!(desktop = get_thread_desktop( thread, 0 ))) clear_error();
+    else
+    {
+        if (desktop->shared) reply->locator = get_shared_object_locator( desktop->shared );
+        release_object( desktop );
+    }
+
     release_object( thread );
 }
 
@@ -788,6 +797,7 @@ DECL_HANDLER(set_thread_desktop)
             if (old_desktop) remove_desktop_thread( old_desktop, current );
             add_desktop_thread( new_desktop, current );
         }
+        reply->locator = get_shared_object_locator( new_desktop->shared );
     }
 
     if (!current->process->desktop)

tools/make_requests

@@ -53,6 +53,7 @@ my %formats =
     "generic_map_t" => [  16,  4,  "&dump_generic_map" ],
     "ioctl_code_t"  => [  4,   4,  "&dump_ioctl_code" ],
     "hw_input_t"    => [  40,  8,  "&dump_hw_input" ],
+    "obj_locator_t" => [  16,  8,  "&dump_obj_locator" ],
     # varargs-only structures
     "apc_call_t"               => [  64,  8 ],
     "context_t"                => [  1728,  8 ],