From 64ad838fde7ab4333fadc804a0339a074d041767 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Sun, 31 Jul 2016 02:30:05 +0300
Subject: [PATCH] esp8266/esp_mphal: Implement libc's errno.

Using __errno() function, and redirect it to use mp_stream_errno from
stream module. This is pre-requisite for integrating with 3rd-party libs,
like BerkeleyDB.
---
 esp8266/esp_mphal.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/esp8266/esp_mphal.c b/esp8266/esp_mphal.c
index 3cc4610825..a2710af2e6 100644
--- a/esp8266/esp_mphal.c
+++ b/esp8266/esp_mphal.c
@@ -259,3 +259,8 @@ int ets_esf_free_bufs(int idx) {
     }
     return cnt;
 }
+
+extern int mp_stream_errno;
+int *__errno() {
+    return &mp_stream_errno;
+}