text: /****************************************************************************
   * group_setupstreams.c
   *
   *   Copyright (C) 2007-2008, 2010-2013 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>
  
  #include <sched.h>
  #include <fcntl.h>
  
  #include <nuttx/fs/fs.h>
  #include <nuttx/net/net.h>
  #include <nuttx/lib.h>
  
  #include "group_internal.h"
  
  /* Make sure that there are file or socket descriptors in the system and
   * that some number of streams have been configured.
   */
  
  #if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0
  #if CONFIG_NFILE_STREAMS > 0
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: group_setupstreams
   *
   * Description:
   *   Setup streams data structures that may be used for standard C buffered
   *   I/O with underlying socket or file desciptors
   *
   ****************************************************************************/
  
  int group_setupstreams(FAR struct task_tcb_s *tcb)
  {
    DEBUGASSERT(tcb && tcb->cmn.group);
  
    /* Initialize file streams for the task group */
  
  #if defined(CONFIG_NUTTX_KERNEL) && defined(CONFIG_MM_KERNEL_HEAP)
    lib_streaminit(tcb->cmn.group->tg_streamlist);
  #else
    lib_streaminit(&tcb->cmn.group->tg_streamlist);
  #endif
  
    /* fdopen to get the stdin, stdout and stderr streams. The following logic
     * depends on the fact that the library layer will allocate FILEs in order.
     *
     * fd = 0 is stdin  (read-only)
     * fd = 1 is stdout (write-only, append)
     * fd = 2 is stderr (write-only, append)
     */
  
    (void)fs_fdopen(0, O_RDONLY,       (FAR struct tcb_s *)tcb);
    (void)fs_fdopen(1, O_WROK|O_CREAT, (FAR struct tcb_s *)tcb);
    (void)fs_fdopen(2, O_WROK|O_CREAT, (FAR struct tcb_s *)tcb);
  
    return OK;
  }
  
  #endif /* CONFIG_NFILE_STREAMS > 0 */
  #endif /* CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0 */
  
  