--- a/router/src/harness/include/mysql/harness/net_ts/impl/file.h	2025-09-24 21:35:03.000000000 +0800
+++ b/router/src/harness/include/mysql/harness/net_ts/impl/file.h	2025-12-15 00:03:50.000000000 +0800
@@ -96,7 +96,32 @@
 
 // posix
 using dup_fd = file_control_option<F_DUPFD, int>;
+#ifndef F_DUPFD_CLOEXEC
+namespace {
+class DupFdCloexec {
+ public:
+  static constexpr int value = F_DUPFD;
+  
+  static int apply(int fd, int min_fd) {
+    int new_fd = :: fcntl(fd, F_DUPFD, min_fd);
+    if (new_fd != -1) {
+      int flags = ::fcntl(new_fd, F_GETFD);
+      if (flags != -1) {
+        ::fcntl(new_fd, F_SETFD, flags | FD_CLOEXEC);
+      } else {
+        ::close(new_fd);
+        return -1;
+      }
+    }
+    return new_fd;
+  }
+};
+}  // namespace
+
+using dup_fd_cloexec = file_control_option<F_DUPFD, int>;
+#else
 using dup_fd_cloexec = file_control_option<F_DUPFD_CLOEXEC, int>;
+#endif
 
 // posix
 //