From 6bbfb2b7ca40d05b315a6c230c84191a16c8b9cc Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Mon, 27 Oct 2014 12:29:15 -0600
Subject: [PATCH 1/2] Add isatty() function. From  Alan Carvalho de Assis

---
 include/termios.h         |  4 +++
 libc/termios/Make.defs    |  4 +--
 libc/termios/lib_isatty.c | 71 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+), 2 deletions(-)
 create mode 100644 libc/termios/lib_isatty.c

diff --git a/include/termios.h b/include/termios.h
index b927dfa0c6..575367cf23 100644
--- a/include/termios.h
+++ b/include/termios.h
@@ -298,6 +298,10 @@ int tcsendbreak(int fd, int duration);
 
 int tcsetattr(int fd, int options, FAR const struct termios *termiosp);
 
+/* Check if a file descriptor corresponds to a terminal I/O file */
+
+int isatty(int fd);
+
 #undef EXTERN
 #ifdef __cplusplus
 }
diff --git a/libc/termios/Make.defs b/libc/termios/Make.defs
index d20a5f95c7..e5a913d6e3 100644
--- a/libc/termios/Make.defs
+++ b/libc/termios/Make.defs
@@ -1,7 +1,7 @@
 ############################################################################
 # libc/misc/Make.defs
 #
-#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2011-2012, 2014 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -41,7 +41,7 @@ ifeq ($(CONFIG_SERIAL_TERMIOS),y)
 
 # Add the termios C files to the build
 
-CSRCS += lib_cfgetspeed.c lib_cfsetspeed.c lib_tcflush.c
+CSRCS += lib_cfgetspeed.c lib_cfsetspeed.c lib_isatty.c lib_tcflush.c
 CSRCS += lib_tcgetattr.c lib_tcsetattr.c
 
 # Add the termios directory to the build
diff --git a/libc/termios/lib_isatty.c b/libc/termios/lib_isatty.c
new file mode 100644
index 0000000000..6f0ec589fb
--- /dev/null
+++ b/libc/termios/lib_isatty.c
@@ -0,0 +1,71 @@
+/****************************************************************************
+ * libc/termios/lib_tcflush.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Alan Carvalho de Assis
+ *
+ *   Source:
+ *     https://github.com/raggi/apue.2e/blob/master/termios/isatty.c
+ *     based on Advanced Programming in the UNIX Environment
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <termios.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: isatty
+ *
+ * Description:
+ *   Return a non-zero (true) value if the file descriptor, fd, corresponds
+ *   to a TTYY.
+ *
+ *   NOTE: Nuttx, of course, does not have true TTYs in the sense that this
+ *   function is intended.  In this implementation, the function simply
+ *   returns true if the file descriptor is associated with a driver that
+ *   responds wo tcgetattr() without an error -- that it, the driver supports
+ *   the NuttX TCGETS ioctl command.
+ *
+ *   Of course, that can only be true if CONFIG_SERIAL_TERMIOS=y.
+ *
+ ****************************************************************************/
+
+int isatty(int fd)
+{
+  struct termios ts;
+  return (tcgetattr(fd, &ts) >= 0);
+}

From 02f64e513ee689f9c86c66ee58ab7695430f188d Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Mon, 27 Oct 2014 12:32:31 -0600
Subject: [PATCH 2/2] Update ChangeLog

---
 ChangeLog | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 269dfe2b81..9eb98f67c0 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -8892,4 +8892,5 @@
 	* include/wchar.h:  Add a mostly bogus wchar.h header file.  This file
 	  is mostly bogus because noneo of the wide character operations are
 	  currently supported in the Nuttx C library (2014-10-27).
-
+	* include/termios.h, libc/termios/lib_isatty.c, and Make.defs: Add
+	  isatty() function. From  Alan Carvalho de Assis (2014-10-27).