forked from Archive/PX4-Autopilot
113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
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/****************************************************************************
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* eched/env_dupenv.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef CONFIG_DISABLE_ENVIRON
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#include <sys/types.h>
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#include <sched.h>
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#include <nuttx/kmalloc.h>
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#include "os_internal.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: dupenv
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*
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* Description:
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* Copy the internal environment structure of a task. This is the action
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* that is performed when a new task is created: The new task has a private,
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* exact duplicate of the parent task's environment.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* A pointer to a newly allocated copy of the specified TCB's environment
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* structure with reference count equal to one.
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*
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* Assumptions:
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* Not called from an interrupt handler.
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*
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****************************************************************************/
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FAR environ_t *dupenv(FAR _TCB *ptcb)
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{
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environ_t *envp = NULL;
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/* Pre-emption must be disabled throughout the following because the
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* environment may be shared.
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*/
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sched_lock();
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/* Does the parent task have an environment? */
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if (ptcb->envp)
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{
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/* Yes..The parent task has an environment, duplicate it */
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size_t envlen = ptcb->envp->ev_alloc
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envp = (environ_t*)kmalloc(SIZEOF_ENVIRON_T( envlen ));
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if (envp)
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{
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envp->ev_crefs = 1;
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envp->ev_alloc = envlen;
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memcmp( envp->ev_env, ptcb->envp->ev_env, envlen );
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}
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}
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sched_unlock();
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return envp;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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