diff --git a/components/libc/compilers/armlibc/fcntl.h b/components/libc/compilers/armlibc/fcntl.h
index 80cf1b4409..3e650a8471 100644
--- a/components/libc/compilers/armlibc/fcntl.h
+++ b/components/libc/compilers/armlibc/fcntl.h
@@ -9,6 +9,8 @@
 #ifndef FCNTL_H__
 #define FCNTL_H__
 
+#include <rtconfig.h>
+
 #ifdef RT_USING_DFS
 #include <dfs_posix.h>
 #endif
diff --git a/components/libc/compilers/armlibc/sys/ioctl.h b/components/libc/compilers/armlibc/sys/ioctl.h
new file mode 100644
index 0000000000..033a57014a
--- /dev/null
+++ b/components/libc/compilers/armlibc/sys/ioctl.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020-09-01     Meco Man     First Version
+ */
+#ifndef _SYS_IOCTL_H
+#define _SYS_IOCTL_H
+
+
+
+#endif
diff --git a/components/libc/compilers/armlibc/sys/unistd.h b/components/libc/compilers/armlibc/sys/unistd.h
index 33f0561e72..3199b01e0e 100644
--- a/components/libc/compilers/armlibc/sys/unistd.h
+++ b/components/libc/compilers/armlibc/sys/unistd.h
@@ -46,4 +46,8 @@
 #define O_SYNC      _FSYNC
 #endif
 
+
+int     isatty      (int fd);
+char *  ttyname     (int desc);
+
 #endif /* _SYS_UNISTD_H */
diff --git a/components/libc/compilers/armlibc/unistd.h b/components/libc/compilers/armlibc/unistd.h
index 70187722d8..736fc219a8 100644
--- a/components/libc/compilers/armlibc/unistd.h
+++ b/components/libc/compilers/armlibc/unistd.h
@@ -7,3 +7,4 @@
  * Date           Author       Notes
  */
 #include "sys/unistd.h"
+
diff --git a/components/libc/compilers/common/unistd.c b/components/libc/compilers/common/unistd.c
new file mode 100644
index 0000000000..04a0886655
--- /dev/null
+++ b/components/libc/compilers/common/unistd.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020-09-01     Meco Man     First Version
+ */
+
+#include <termios.h>
+#include <unistd.h>
+
+#ifdef RT_USING_POSIX_TERMIOS
+int isatty(int fd)
+{
+    struct termios ts;
+    return(tcgetattr(fd,&ts) != -1);/*true if no error (is a tty)*/
+}
+#endif
+
+char *ttyname(int fd)
+{
+    return "/dev/tty0"; /*TODO: need to add more specific*/
+}
diff --git a/components/libc/compilers/dlib/sys/unistd.h b/components/libc/compilers/dlib/sys/unistd.h
index 29f68f24f8..9564daba8d 100644
--- a/components/libc/compilers/dlib/sys/unistd.h
+++ b/components/libc/compilers/dlib/sys/unistd.h
@@ -36,4 +36,8 @@
 
 #endif
 
+
+int     isatty      (int fd);
+char *  ttyname     (int desc);
+
 #endif /* _SYS_UNISTD_H */
diff --git a/components/libc/termios/posix_termios.c b/components/libc/termios/posix_termios.c
index 75c876dd33..9c736c3184 100644
--- a/components/libc/termios/posix_termios.c
+++ b/components/libc/termios/posix_termios.c
@@ -5,7 +5,7 @@
  *
  * Change Logs:
  * Date           Author       Notes
- * 2017/08/30      Bernard      The first version
+ * 2017/08/30     Bernard      The first version
  */
 #include <stdlib.h>
 #include <string.h>
@@ -111,13 +111,6 @@ int tcdrain(int fd)
     return 0;
 }
 
-int isatty (int  fd)
-{
-    struct termios term;
-
-    return tcgetattr (fd, &term) == 0;
-}
-
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 void cfmakeraw(struct termios *t)
 {
diff --git a/components/libc/termios/posix_termios.h b/components/libc/termios/posix_termios.h
index 6d4be129ff..c61191b7dc 100644
--- a/components/libc/termios/posix_termios.h
+++ b/components/libc/termios/posix_termios.h
@@ -5,13 +5,13 @@
  *
  * Change Logs:
  * Date           Author       Notes
- * 2017/08/30      Bernard      The first version
+ * 2017/08/30     Bernard      The first version
  */
 #ifndef TERMIOS_H__
 #define TERMIOS_H__
 
 #include <rtthread.h>
-#include <termios.h>
+#include <sys/types.h>
 
 #ifdef __cplusplus
 extern "C" {