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diff --git a/nuttx/mm/shm/shmdt.c b/nuttx/mm/shm/shmdt.c
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+/****************************************************************************
+ * mm/shm/shmdt.c
+ *
+ *   Copyright (C) 2014 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/shm.h>
+#include <errno.h>
+
+#ifdef CONFIG_MM_SHM
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: shmdt
+ *
+ * Description:
+ *   The shmdt() function detaches the shared memory segment located at the
+ *   address specified by shmaddr from the address space of the calling
+ *   process.
+ *
+ * Input Parameters:
+ *   shmid - Shared memory identifier
+ *
+ * Returned Value:
+ *   Upon successful completion, shmdt() will decrement the value of
+ *   shm_nattch in the data structure associated with the shared memory ID
+ *   of the attached shared memory segment and return 0.
+ *
+ *   Otherwise, the shared memory segment will not be detached, shmdt()
+ &   will return -1, and errno will be set to indicate the error.
+ *
+ *   - EINVAL
+ *     The value of shmaddr is not the data segment start address of a
+ *     shared memory segment.
+ *
+ ****************************************************************************/
+
+int shmdt(FAR const void *shmaddr)
+{
+#warning Not implemented
+  set_errno(ENOSYS);
+  return ERROR;
+}
+
+#endif /* CONFIG_MM_SHM */