按提示词结论补 INI 命名参数桥

core/src/linuxcnc_rs274_backend.cpp

@@ -82,6 +82,37 @@ bool file_mode_enabled() {
     return std::getenv("CNC_SIM_RS274_FILE_MODE") != nullptr;
 }
 
+class ScopedEnvironmentVariable {
+public:
+    ScopedEnvironmentVariable(const char *name, const std::string &value) : name_(name), active_(!value.empty()) {
+        if (!active_) {
+            return;
+        }
+        if (const char *old = std::getenv(name_)) {
+            had_old_ = true;
+            old_ = old;
+        }
+        setenv(name_, value.c_str(), 1);
+    }
+
+    ~ScopedEnvironmentVariable() {
+        if (!active_) {
+            return;
+        }
+        if (had_old_) {
+            setenv(name_, old_.c_str(), 1);
+        } else {
+            unsetenv(name_);
+        }
+    }
+
+private:
+    const char *name_;
+    bool active_;
+    bool had_old_ = false;
+    std::string old_;
+};
+
 #ifndef CNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE
 bool write_temp_program(const char *program,
                         size_t program_len,
@@ -197,6 +228,9 @@ int parse_linuxcnc_rs274_backend(CanonEventSink &sink,
     sink.clear_callback_status();
     cnc_sim_linuxcnc_set_canon_sink(&sink);
 
+    // LinuxCNC source basis: rs274ngc_pre.cc and interp_namedparams.cc read
+    // INI_FILE_NAME for startup and #<_ini[section]key> named parameters.
+    ScopedEnvironmentVariable ini_file_env("INI_FILE_NAME", options.ini_file_name);
     InterpBase *interp = makeInterp();
     if (!options.ini_file_name.empty()) {
         // LinuxCNC source basis: emctask.cc calls Interp::ini_load() before