diff --git a/libc/bionic/fdtrack.cpp b/libc/bionic/fdtrack.cpp
new file mode 100644
index 0000000..38eb219
--- /dev/null
+++ b/libc/bionic/fdtrack.cpp
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdatomic.h>
+
+#include <android/fdtrack.h>
+
+#include <platform/bionic/reserved_signals.h>
+
+#include "private/bionic_fdtrack.h"
+#include "private/bionic_tls.h"
+#include "private/bionic_globals.h"
+
+_Atomic(android_fdtrack_hook_t) __android_fdtrack_hook;
+
+bool android_fdtrack_get_enabled() {
+  return !__get_bionic_tls().fdtrack_disabled;
+}
+
+bool android_fdtrack_set_enabled(bool new_value) {
+  auto& tls = __get_bionic_tls();
+  bool prev = !tls.fdtrack_disabled;
+  tls.fdtrack_disabled = !new_value;
+  return prev;
+}
+
+bool android_fdtrack_compare_exchange_hook(android_fdtrack_hook_t* expected,
+                                           android_fdtrack_hook_t value) {
+  return atomic_compare_exchange_strong(&__android_fdtrack_hook, expected, value);
+}
+
+void __libc_init_fdtrack() {
+  // Register a no-op signal handler.
+  signal(BIONIC_SIGNAL_FDTRACK, [](int) {});
+}