proc/WIP: better handling for TLS

test.cpp

@@ -1,4 +1,6 @@
 #include <iostream>
+#include <cerrno>
+#include <fcntl.h>
 
 int main() {
     std::vector<int> items;
@@ -9,5 +11,11 @@ int main() {
     for (const auto &item: items) {
         std::cout << "Item: " << item << std::endl;
     }
+
+    std::cout << "&errno = " << &errno << std::endl;
+    std::cout << "errno = " << errno << std::endl;
+    open("/xxxsaa", 0, 0);
+    std::cout << "errno = " << errno << std::endl;
+
     return 0;
 }