auto import from //depot/cupcake/@135843
diff --git a/libc/bionic/ptrace.c b/libc/bionic/ptrace.c
new file mode 100644
index 0000000..b1ca00c
--- /dev/null
+++ b/libc/bionic/ptrace.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2008 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 <sys/types.h>
+#include <sys/ptrace.h>
+
+extern long __ptrace(int request, pid_t pid, void *addr, void *data);
+
+long ptrace(int request, pid_t pid, void * addr, void * data)
+{
+ switch (request) {
+ case PTRACE_PEEKUSR:
+ case PTRACE_PEEKTEXT:
+ case PTRACE_PEEKDATA:
+ {
+ long word;
+ long ret;
+
+ ret = __ptrace(request, pid, addr, &word);
+ if (ret == 0) {
+ return word;
+ } else {
+ // __ptrace will set errno for us
+ return -1;
+ }
+ }
+
+ default:
+ return __ptrace(request, pid, addr, data);
+ }
+}
+
+/*
+ * Hook for gdb to get notified when a thread is created
+ */
+void _thread_created_hook(pid_t thread_id) __attribute__((noinline));
+void _thread_created_hook(pid_t thread_id)
+{
+}