From b7da67cdaaf32317cfc9a3940bd58f2aab4976c9 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Wed, 19 Jun 2019 14:02:08 +1000
Subject: [PATCH] lib/utils/sys_stdio_mphal: Add support to poll sys.stdin and
 sys.stdout.

A port must provide the following function for this to work:

    uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags);
---
 lib/utils/sys_stdio_mphal.c | 14 +++++++++++++-
 py/mphal.h                  |  4 ++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/lib/utils/sys_stdio_mphal.c b/lib/utils/sys_stdio_mphal.c
index 234db0829..3fcaf8e59 100644
--- a/lib/utils/sys_stdio_mphal.c
+++ b/lib/utils/sys_stdio_mphal.c
@@ -3,7 +3,7 @@
  *
  * The MIT License (MIT)
  *
- * Copyright (c) 2013-2017 Damien P. George
+ * Copyright (c) 2013-2019 Damien P. George
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -85,6 +85,16 @@ STATIC mp_uint_t stdio_write(mp_obj_t self_in, const void *buf, mp_uint_t size,
     }
 }
 
+STATIC mp_uint_t stdio_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
+    (void)self_in;
+    if (request == MP_STREAM_POLL) {
+        return mp_hal_stdio_poll(arg);
+    } else {
+        *errcode = MP_EINVAL;
+        return MP_STREAM_ERROR;
+    }
+}
+
 STATIC mp_obj_t stdio_obj___exit__(size_t n_args, const mp_obj_t *args) {
     return mp_const_none;
 }
@@ -112,6 +122,7 @@ STATIC MP_DEFINE_CONST_DICT(stdio_locals_dict, stdio_locals_dict_table);
 STATIC const mp_stream_p_t stdio_obj_stream_p = {
     .read = stdio_read,
     .write = stdio_write,
+    .ioctl = stdio_ioctl,
     .is_text = true,
 };
 
@@ -146,6 +157,7 @@ STATIC mp_uint_t stdio_buffer_write(mp_obj_t self_in, const void *buf, mp_uint_t
 STATIC const mp_stream_p_t stdio_buffer_obj_stream_p = {
     .read = stdio_buffer_read,
     .write = stdio_buffer_write,
+    .ioctl = stdio_ioctl,
     .is_text = false,
 };
 
diff --git a/py/mphal.h b/py/mphal.h
index 92de01d08..66d80705a 100644
--- a/py/mphal.h
+++ b/py/mphal.h
@@ -34,6 +34,10 @@
 #include <mphalport.h>
 #endif
 
+#ifndef mp_hal_stdio_poll
+uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags);
+#endif
+
 #ifndef mp_hal_stdin_rx_chr
 int mp_hal_stdin_rx_chr(void);
 #endif