按建议，继续完成后续工作

结论：将 Interp::synch() 当前/选中工具槽位读取接入 standalone tool adapter，并补充 native 验证。

wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_interp_init_harness.cpp

@@ -8,6 +8,7 @@
 #include <unistd.h>
 
 #include "canon_event_sink.hh"
+#include "linuxcnc_tool_adapter.hh"
 #include "nml_intf/emc.hh"
 
 namespace {
@@ -31,6 +32,7 @@ int main()
     std::filesystem::current_path(temp_dir);
 
     emcStatus->motion.traj.linearUnits = 1.0;
+    standalone::reset_tool_adapter();
     Interp interp;
     standalone::reset_canon_events();
 
@@ -47,6 +49,7 @@ int main()
     }
 
     emcStatus->motion.traj.linearUnits = 1.0 / 25.4;
+    standalone::reset_tool_adapter();
     Interp inch_interp;
     standalone::reset_canon_events();
     const int inch_rc = inch_interp.init();
@@ -60,7 +63,24 @@ int main()
         std::cout << "inch_canon_event=" << event << "\n";
     }
 
+    standalone::reset_tool_adapter();
+    CANON_TOOL_TABLE tool = standalone::tool_entry_init();
+    tool.toolno = 2;
+    tool.pocketno = 2;
+    standalone::set_tool_entry(2, tool);
+    standalone::select_tool(2);
+    standalone::change_selected_tool();
+
+    Interp synch_interp;
+    const int synch_rc = synch_interp.synch();
+    std::cout << "synch=" << synch_rc << "\n";
+    std::cout << "synch.current_pocket=" << synch_interp._setup.current_pocket << "\n";
+    std::cout << "synch.selected_pocket=" << synch_interp._setup.selected_pocket << "\n";
+    std::cout << "synch.tool_0=" << synch_interp._setup.tool_table[0].toolno << "\n";
+    std::cout << "synch.tool_2=" << synch_interp._setup.tool_table[2].toolno << "\n";
+
     emcStatus->motion.traj.linearUnits = 1.0;
+    standalone::reset_tool_adapter();
     std::filesystem::remove_all(temp_dir);
-    return (rc == INTERP_OK && inch_rc == INTERP_OK) ? 0 : 1;
+    return (rc == INTERP_OK && inch_rc == INTERP_OK && synch_rc == INTERP_OK) ? 0 : 1;
 }

wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_interp_minimal_runtime.cpp

@@ -505,8 +505,8 @@ double GET_EXTERNAL_TOOL_LENGTH_COFFSET() { return 0.0; }
 double GET_EXTERNAL_TOOL_LENGTH_UOFFSET() { return 0.0; }
 double GET_EXTERNAL_TOOL_LENGTH_VOFFSET() { return 0.0; }
 double GET_EXTERNAL_TOOL_LENGTH_WOFFSET() { return 0.0; }
-int GET_EXTERNAL_TOOL_SLOT() { return 0; }
-int GET_EXTERNAL_SELECTED_TOOL_SLOT() { return -1; }
+int GET_EXTERNAL_TOOL_SLOT() { return standalone::current_tool_index(); }
+int GET_EXTERNAL_SELECTED_TOOL_SLOT() { return standalone::selected_tool_index(); }
 CANON_TOOL_TABLE GET_EXTERNAL_TOOL_TABLE(int index)
 {
     CANON_TOOL_TABLE tool = standalone::tool_entry_init();

wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_tool_adapter.cpp

@@ -10,12 +10,18 @@ std::array<CANON_TOOL_TABLE, CANON_POCKETS_MAX> &tool_table()
     return tools;
 }
 
-int &selected_tool_index()
+int &selected_tool_index_ref()
 {
     static int index = -1;
     return index;
 }
 
+int &current_tool_index_ref()
+{
+    static int index = 0;
+    return index;
+}
+
 CANON_TOOL_TABLE empty_tool()
 {
     CANON_TOOL_TABLE tool{};
@@ -30,7 +36,8 @@ namespace standalone {
 
 void reset_tool_adapter()
 {
-    selected_tool_index() = -1;
+    selected_tool_index_ref() = -1;
+    current_tool_index_ref() = 0;
     auto &tools = tool_table();
     for (int index = 0; index < CANON_POCKETS_MAX; ++index) {
         tools[index] = empty_tool();
@@ -76,9 +83,19 @@ int get_tool_entry(CANON_TOOL_TABLE *tool, int index)
     return 0;
 }
 
+int current_tool_index()
+{
+    return current_tool_index_ref();
+}
+
+int selected_tool_index()
+{
+    return selected_tool_index_ref();
+}
+
 void select_tool(int toolno)
 {
-    selected_tool_index() = find_tool_index_for_tool(toolno);
+    selected_tool_index_ref() = find_tool_index_for_tool(toolno);
 }
 
 void change_tool_number(int index)
@@ -91,11 +108,12 @@ void change_tool_number(int index)
     CANON_TOOL_TABLE spindle_tool = tools[index];
     spindle_tool.pocketno = 0;
     tools[0] = spindle_tool;
+    current_tool_index_ref() = index;
 }
 
 void change_selected_tool()
 {
-    change_tool_number(selected_tool_index());
+    change_tool_number(selected_tool_index_ref());
 }
 
 }  // namespace standalone

wasm-port/runtime/core/linuxcnc_wrap/linuxcnc_tool_adapter.hh

@@ -9,6 +9,8 @@ void set_tool_entry(int index, const CANON_TOOL_TABLE &tool);
 CANON_TOOL_TABLE tool_entry_init();
 int find_tool_index_for_tool(int toolno);
 int get_tool_entry(CANON_TOOL_TABLE *tool, int index);
+int current_tool_index();
+int selected_tool_index();
 void select_tool(int toolno);
 void change_selected_tool();
 void change_tool_number(int index);