diff --git a/libc/bionic/clone.cpp b/libc/bionic/clone.cpp
new file mode 100644
index 0000000..1d997fe
--- /dev/null
+++ b/libc/bionic/clone.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+#define __GNU_SOURCE 1
+#include <sched.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+extern "C" pid_t __bionic_clone(uint32_t flags, void* child_stack, int* parent_tid, void* tls, int* child_tid, int (*fn)(void*), void* arg);
+extern "C" void __exit(int status);
+
+// Called from the __bionic_clone assembler to call the thread function then exit.
+extern "C" void __bionic_clone_entry(int (*fn)(void*), void* arg) {
+  int status = (*fn)(arg);
+  __exit(status);
+}
+
+int clone(int (*fn)(void*), void* child_stack, int flags, void* arg, ...) {
+  int* parent_tid = NULL;
+  void* new_tls = NULL;
+  int* child_tid = NULL;
+
+  // Extract any optional parameters required by the flags.
+  va_list args;
+  va_start(args, arg);
+  if ((flags & (CLONE_PARENT_SETTID|CLONE_SETTLS|CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID)) != 0) {
+    parent_tid = va_arg(args, int*);
+  }
+  if ((flags & (CLONE_SETTLS|CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID)) != 0) {
+    new_tls = va_arg(args, void*);
+  }
+  if ((flags & (CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID)) != 0) {
+    child_tid = va_arg(args, int*);
+  }
+  va_end(args);
+
+  return __bionic_clone(flags, child_stack, parent_tid, new_tls, child_tid, fn, arg);
+}