================
@@ -0,0 +1,44 @@
+//===-- Ptrace.h ------------------------------------------------*- C++ 
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// This file defines ptrace functions & structures
+
+#ifndef liblldb_Host_aix_Ptrace_h_
+#define liblldb_Host_aix_Ptrace_h_
+
+#include <sys/ptrace.h>
+
+#define DEBUG_PTRACE_MAXBYTES 20
+
+// Support ptrace extensions even when compiled without required kernel support
+#ifndef PTRACE_GETREGS
+#define PTRACE_GETREGS (PT_COMMAND_MAX + 1)
----------------
DavidSpickett wrote:

This PT_COMMAND_MAX is provided by some AIX include file, correct?

If that's correct then using it like this is fine because PTrace.h is only 
included in code built natively.

Do you have public documentation for these ptrace numbers? Perhaps there is a 
man page like https://man7.org/linux/man-pages/man2/ptrace.2.html? It would be 
good to include a link to that in the PR description.

https://github.com/llvm/llvm-project/pull/108000
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