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diff --git a/nuttx/sched/environ/env_dup.c b/nuttx/sched/environ/env_dup.c
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+/****************************************************************************
+ * sched/environ/env_dup.c
+ *
+ *   Copyright (C) 2007, 2009, 2011, 2013 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>
+
+#ifndef CONFIG_DISABLE_ENVIRON
+
+#include <sys/types.h>
+#include <sched.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/kmalloc.h>
+
+#include "os_internal.h"
+#include "environ/environ.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: env_dup
+ *
+ * Description:
+ *   Copy the internal environment structure of a task.  This is the action
+ *   that is performed when a new task is created: The new task has a private,
+ *   exact duplicate of the parent task's environment.
+ *
+ * Parameters:
+ *   group The child task group to receive the newly allocated copy of the
+ *        parent task groups environment structure.
+ *
+ * Return Value:
+ *   zero on success
+ *
+ * Assumptions:
+ *   Not called from an interrupt handler.
+ *
+ ****************************************************************************/
+
+int env_dup(FAR struct task_group_s *group)
+{
+  FAR struct tcb_s *ptcb = (FAR struct tcb_s*)g_readytorun.head;
+  FAR char *envp = NULL;
+  size_t envlen;
+  int ret = OK;
+
+  DEBUGASSERT(group && ptcb && ptcb->group);
+
+  /* Pre-emption must be disabled throughout the following because the
+   * environment may be shared.
+   */
+
+  sched_lock();
+
+  /* Does the parent task have an environment? */
+
+  if (ptcb->group && ptcb->group->tg_envp)
+    {
+      /* Yes..The parent task has an environment, duplicate it */
+
+      envlen = ptcb->group->tg_envsize;
+      envp   = (FAR char *)kumalloc(envlen);
+      if (!envp)
+        {
+          ret = -ENOMEM;
+        }
+      else
+        {
+          group->tg_envsize = envlen;
+          group->tg_envp    = envp;
+          memcpy(envp, ptcb->group->tg_envp, envlen);
+        }
+    }
+
+  sched_unlock();
+  return ret;
+}
+
+#endif /* CONFIG_DISABLE_ENVIRON */
+
+
+