1 files changed, 112 insertions, 0 deletions
diff --git a/nuttx/sched/env_dupenv.c b/nuttx/sched/env_dupenv.c
new file mode 100644
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+++ b/nuttx/sched/env_dupenv.c
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+/****************************************************************************
+ * eched/env_dupenv.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 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 <nuttx/kmalloc.h>
+
+#include "os_internal.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dupenv
+ *
+ * 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:
+ *   None
+ *
+ * Return Value:
+ *   A pointer to a newly allocated copy of the specified TCB's environment
+ *   structure with reference count equal to one.
+ *
+ * Assumptions:
+ *   Not called from an interrupt handler.
+ *
+ ****************************************************************************/
+
+FAR environ_t *dupenv(FAR _TCB *ptcb)
+{
+   environ_t *envp = NULL;
+
+  /* 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->envp)
+    {
+      /* Yes..The parent task has an environment, duplicate it */
+
+      size_t envlen =  ptcb->envp->ev_alloc
+      envp          = (environ_t*)kmalloc(SIZEOF_ENVIRON_T( envlen ));
+      if (envp)
+        {
+          envp->ev_crefs = 1;
+          envp->ev_alloc = envlen;
+          memcmp( envp->ev_env, ptcb->envp->ev_env, envlen );
+        }
+    }
+
+  sched_unlock();
+  return envp;
+}
+
+#endif /* CONFIG_DISABLE_ENVIRON */
+
+
+