text: /****************************************************************************
   * sched/environ/env_release.c
   *
   *   Copyright (C) 2007, 2009, 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 <sched.h>
  #include <errno.h>
  
  #include <nuttx/kmalloc.h>
  
  #include "environ/environ.h"
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: env_release
   *
   * Description:
   *   env_release() is called only from group_leave() when the last member of
   *   a task group exits.  The env_release() function clears the environment
   *   of all name-value pairs and sets the value of the external variable
   *   environ to NULL.
   *
   * Parameters:
   *   group Identifies the task group containing the environment structure
   *     to be released.
   *
   * Return Value:
   *   None
   *
   * Assumptions:
   *   Not called from an interrupt handler
   *
   ****************************************************************************/
  
  void env_release(FAR struct task_group_s *group)
  {
    DEBUGASSERT(group);
  
    /* Free any allocate environment strings */
  
    if (group->tg_envp)
      {
        /* Free the environment */
  
        sched_ufree(group->tg_envp);
      }
  
    /* In any event, make sure that all environment-related varialbles in the
     * task group structure are reset to initial values.
     */
  
    group->tg_envsize = 0;
    group->tg_envp = NULL;
  }
  
  #endif /* CONFIG_DISABLE_ENVIRON */
  
  
  
  