Still trying to recover directory contents

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5330 42af7a65-404d-4744-a932-0658087f49c3

6 files changed, 566 insertions, 0 deletions

diff --git a/nuttx/libc/termios/Make.defs b/nuttx/libc/termios/Make.defs
new file mode 100644
index 000000000..a6bb77f83
--- /dev/null
+++ b/nuttx/libc/termios/Make.defs
@@ -0,0 +1,54 @@
+############################################################################
+# lib/misc/Make.defs
+#
+#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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.
+#
+############################################################################
+
+# termios.h support requires file descriptors and that CONFIG_SERIAL_TERMIOS
+# is defined
+
+ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
+ifeq ($(CONFIG_SERIAL_TERMIOS),y)
+
+# Add the termios C files to the build
+
+CSRCS += lib_cfgetspeed.c lib_cfsetspeed.c lib_tcflush.c
+CSRCS += lib_tcgetattr.c lib_tcsetattr.c
+
+# Add the termios directory to the build
+
+DEPPATH += --dep-path termios
+VPATH += termios
+
+endif
+endif
+
diff --git a/nuttx/libc/termios/lib_cfgetspeed.c b/nuttx/libc/termios/lib_cfgetspeed.c
new file mode 100644
index 000000000..d7f0dc473
--- /dev/null
+++ b/nuttx/libc/termios/lib_cfgetspeed.c
@@ -0,0 +1,93 @@
+/****************************************************************************
+ * lib/termios/lib_cfgetspeed.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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>
+#include <assert.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cfgetspeed
+ *
+ * Descripton:
+ *   The cfgetspeed() function is a non-POSIX function will extract the baud
+ *   from the termios structure to which the termiosp argument points.
+ *
+ *   This function will return exactly the value in the termios data
+ *   structure, without interpretation.
+ *
+ *   NOTE 1: NuttX does not control input/output baud independently.  Both
+ *   must be the same.  The POSIX standard interfaces, cfisetispeed() and
+ *   cfisetospeed() are defined to be cfgetspeed() in termios.h.
+ *   NOTE 2.  In Nuttx, the speed_t is defined to be uint32_t and the baud
+ *   encodings of termios.h are the actual baud values themselves.  Therefore,
+ *   any baud value may be returned here... not just those enumerated in
+ *   termios.h
+ *
+ * Input Parameters:
+ *   termiosp - The termiosp argument is a pointer to a termios structure.
+ *
+ * Returned Value:
+ *   Encoded baud value from the termios structure. 
+ *
+ ****************************************************************************/
+
+speed_t cfgetspeed(FAR const struct termios *termiosp)
+{
+  DEBUGASSERT(termiosp);
+  return termiosp->c_speed;
+}
diff --git a/nuttx/libc/termios/lib_cfsetspeed.c b/nuttx/libc/termios/lib_cfsetspeed.c
new file mode 100644
index 000000000..714562ff5
--- /dev/null
+++ b/nuttx/libc/termios/lib_cfsetspeed.c
@@ -0,0 +1,116 @@
+/****************************************************************************
+ * lib/termios/lib_cfsetspeed.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <sys/types.h>
+#include <termios.h>
+#include <assert.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cfsetspeed
+ *
+ * Descripton:
+ *   The cfsetspeed() function is a non-POSIX function that sets the baud
+ *   stored in the structure pointed to by termiosp to speed.
+ *
+ *   There is no effect on the baud set in the hardware until a subsequent
+ *   successful call to tcsetattr() on the same termios structure. 
+ *
+ *   NOTE 1: NuttX does not control input/output baud independently.  Both
+ *   must be the same.  The POSIX standard interfaces, cfisetispeed() and
+ *   cfisetospeed() are defined to be cfsetspeed() in termios.h.
+ *
+ *   NOTE 3:  A consequence of NOTE 1 is that you should never attempt to
+ *   set the input and output baud to different values.
+ *
+ *   Also, the following POSIX requirement cannot be supported: "If the input
+ *   baud rate stored in the termios structure pointed to by termios_p is 0,
+ *   the input baud rate given to the hardware will be the same as the output
+ *   baud rate stored in the termios structure."
+ *
+ *   NOTE 2.  In Nuttx, the speed_t is defined to be uint32_t and the baud
+ *   encodings of termios.h are the actual baud values themselves.  Therefore,
+ *   any baud value can be provided as the speed argument here.  However, if
+ *   you do so, your code will *NOT* be portable to other environments where
+ *   speed_t is smaller and where the termios.h baud values are encoded! To
+ *   avoid portability issues, use the baud definitions in termios.h!
+ *
+ *   Linux, for example, would require this (also non-portable) sequence:
+ *
+ *     cfsetispeed(termiosp, BOTHER);
+ *     termiosp->c_ispeed = baud;
+ *
+ *     cfsetospeed(termiosp, BOTHER);
+ *     termiosp->c_ospeed = baud;
+ *
+ * Input Parameters:
+ *   termiosp - The termiosp argument is a pointer to a termios structure.
+ *   speed - The new input speed
+ *
+ * Returned Value:
+ *   Baud is not checked... OK is always returned (this is non-standard
+ *   behavior). 
+ *
+ ****************************************************************************/
+
+int cfsetspeed(FAR struct termios *termiosp, speed_t speed)
+{
+  DEBUGASSERT(termiosp);
+  termiosp->c_speed = speed;
+  return OK;
+}
diff --git a/nuttx/libc/termios/lib_tcflush.c b/nuttx/libc/termios/lib_tcflush.c
new file mode 100644
index 000000000..338524bdd
--- /dev/null
+++ b/nuttx/libc/termios/lib_tcflush.c
@@ -0,0 +1,88 @@
+/****************************************************************************
+ * lib/termios/lib_tcflush.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <nuttx/config.h>
+
+#include <sys/ioctl.h>
+
+#include <termios.h>
+#include <errno.h>
+
+#include <nuttx/serial/tioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tcflush
+ *
+ * Descripton:
+ *   Function for flushing a terminal/serial device
+ *
+ * Input Parameters:
+ *   fd  - The 'fd' argument is an open file descriptor associated with a terminal.
+ *   cmd - The TCFLSH ioctl argument.
+ *
+ * Returned Value:
+ *   Upon successful completion, 0 is returned. Otherwise, -1 is returned and
+ *   errno is set to indicate the error.
+ *
+ ****************************************************************************/
+
+int tcflush(int fd, int cmd)
+{
+  return ioctl(fd, TCFLSH, (unsigned long)cmd);
+}
diff --git a/nuttx/libc/termios/lib_tcgetattr.c b/nuttx/libc/termios/lib_tcgetattr.c
new file mode 100644
index 000000000..500871d9f
--- /dev/null
+++ b/nuttx/libc/termios/lib_tcgetattr.c
@@ -0,0 +1,93 @@
+/****************************************************************************
+ * lib/termios/lib_tcgetattr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <nuttx/config.h>
+
+#include <sys/ioctl.h>
+
+#include <termios.h>
+#include <errno.h>
+
+#include <nuttx/serial/tioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tcgetattr
+ *
+ * Descripton:
+ *   The tcgetattr() function gets the parameters associated with the
+ *   terminal referred to by 'fd' and stores them in the termios structure
+ *   referenced by 'termiosp'.
+ *
+ * Input Parameters:
+ *   fd - The 'fd' argument is an open file descriptor associated with a terminal.
+ *   termiosp - The termiosp argument is a pointer to a termios structure.
+ *
+ * Returned Value:
+ *   Upon successful completion, 0 is returned. Otherwise, -1 is returned and
+ *   errno is set to indicate the error.  The following errors may be reported:
+ *
+ *   - EBADF: The 'fd' argument is not a valid file descriptor. 
+ *   - ENOTTY: The file associated with 'fd' is not a terminal. 
+ *
+ ****************************************************************************/
+
+int tcgetattr(int fd, FAR struct termios *termiosp)
+{
+  return ioctl(fd, TCGETS, (unsigned long)termiosp);
+}
diff --git a/nuttx/libc/termios/lib_tcsetattr.c b/nuttx/libc/termios/lib_tcsetattr.c
new file mode 100644
index 000000000..791b519c8
--- /dev/null
+++ b/nuttx/libc/termios/lib_tcsetattr.c
@@ -0,0 +1,122 @@
+/****************************************************************************
+ * lib/termios/lib_tcsetattr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <nuttx/config.h>
+
+#include <sys/ioctl.h>
+
+#include <termios.h>
+#include <errno.h>
+
+#include <nuttx/serial/tioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tcsetattr
+ *
+ * Descripton:
+ *   The tcsetattr() function sets the parameters associated with the
+ *   terminal referred to by the open file descriptor 'fd' from the termios
+ *   structure referenced by 'termiop' as follows:
+ *
+ *   If 'options' is TCSANOW, the change will occur immediately.
+ *
+ *   If 'options' is TCSADRAIN, the change will occur after all output
+ *   written to 'fd' is transmitted. This function should be used when changing
+ *   parameters that affect output.
+ *
+ *   If 'options' is TCSAFLUSH, the change will occur after all
+ *   output written to 'fd' is transmitted, and all input so far received but
+ *   not read will be discarded before the change is made.
+ *
+ *   The tcsetattr() function will return successfully if it was able to
+ *   perform any of the requested actions, even if some of the requested
+ *   actions could not be performed. It will set all the attributes that
+ *   implementation supports as requested and leave all the attributes not
+ *   supported by the implementation unchanged. If no part of the request
+ *   can be honoured, it will return -1 and set errno to EINVAL.
+ *
+ *   The effect of tcsetattr() is undefined if the value of the termios
+ *   structure pointed to by 'termiop' was not derived from the result of
+ *   a call to tcgetattr() on 'fd'; an application should modify only fields
+ *   and flags defined by this specification between the call to tcgetattr()
+ *   and tcsetattr(), leaving all other fields and flags unmodified.
+ *
+ * Returned Value:
+ *
+ *   Upon successful completion, 0 is returned. Otherwise, -1 is returned
+ *   and errno is set to indicate the error.  The following errors may be
+ *   reported:
+ *
+ *   - EBADF: The 'fd' argument is not a valid file descriptor. 
+ *   - EINTR:  A signal interrupted tcsetattr(). 
+ *   - EINVAL: The 'options' argument is not a supported value, or
+ *     an attempt was made to change an attribute represented in the
+ *     termios structure to an unsupported value. 
+ *   - ENOTTY: The file associated with 'fd' is not a terminal. 
+ *
+ ****************************************************************************/
+
+int tcsetattr(int fd, int options, FAR const struct termios *termiosp)
+{
+  if (options == TCSANOW)
+    {
+      return ioctl(fd, TCSETS, (unsigned long)termiosp);
+    }
+  return -ENOSYS;
+}