From 20b95b8af54dc4be1012f9b395873c2577a2373e Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Wed, 24 Feb 2021 22:09:00 +0800
Subject: [PATCH] [libc]fix bug of _isatty_r()

---
 components/libc/compilers/newlib/syscalls.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/components/libc/compilers/newlib/syscalls.c b/components/libc/compilers/newlib/syscalls.c
index 45aa4a34de..949d8a61de 100644
--- a/components/libc/compilers/newlib/syscalls.c
+++ b/components/libc/compilers/newlib/syscalls.c
@@ -8,6 +8,7 @@
  * 2021-02-11     Meco Man     remove _gettimeofday_r() and _times_r()
  * 2020-02-13     Meco Man     re-implement exit() and abort()
  * 2020-02-21     Meco Man     improve and beautify syscalls
+ * 2020-02-24     Meco Man     fix bug of _isatty_r()
  */
 
 #include <reent.h>
@@ -89,12 +90,14 @@ int
 _isatty_r(struct _reent *ptr, int fd)
 {
     if (fd >=0 && fd < 3)
+    {
         return 1;
-
-    ptr->_errno = ENOTTY ;
-    return 0;
+    }
+    else
+    {
+        return 0;
+    }
 }
-
 int
 _kill_r(struct _reent *ptr, int pid, int sig)
 {
-- 
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