diff --git a/base/include/android-base/unique_fd.h b/base/include/android-base/unique_fd.h
index a39245b..6e11b4e 100644
--- a/base/include/android-base/unique_fd.h
+++ b/base/include/android-base/unique_fd.h
@@ -92,6 +92,8 @@
   explicit unique_fd_impl(int fd) { reset(fd); }
   ~unique_fd_impl() { reset(); }
 
+  unique_fd_impl(const unique_fd_impl&) = delete;
+  void operator=(const unique_fd_impl&) = delete;
   unique_fd_impl(unique_fd_impl&& other) noexcept { reset(other.release()); }
   unique_fd_impl& operator=(unique_fd_impl&& s) noexcept {
     int fd = s.fd_;
@@ -118,6 +120,8 @@
   // Catch bogus error checks (i.e.: "!fd" instead of "fd != -1").
   bool operator!() const = delete;
 
+  bool ok() const { return get() != -1; }
+
   int release() __attribute__((warn_unused_result)) {
     tag(fd_, this, nullptr);
     int ret = fd_;
@@ -167,9 +171,6 @@
   static auto close(int fd, void*) -> decltype(T::Close(fd), void()) {
     T::Close(fd);
   }
-
-  unique_fd_impl(const unique_fd_impl&);
-  void operator=(const unique_fd_impl&);
 };
 
 using unique_fd = unique_fd_impl<DefaultCloser>;