nuttx/lib/stdio/lib_libflushall.c

/****************************************************************************
 * lib/stdio/lib_libflushall.c
 *
 *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * 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 <stdbool.h>
#include <fcntl.h>
#include <errno.h>

#include <nuttx/fs.h>

#include "lib_internal.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Type Declarations
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Global Constant Data
 ****************************************************************************/

/****************************************************************************
 * Global Variables
 ****************************************************************************/

/****************************************************************************
 * Private Constant Data
 ****************************************************************************/

/****************************************************************************
 * Private Variables
 ****************************************************************************/

/****************************************************************************
 * Global Functions
 ****************************************************************************/

/****************************************************************************
 * Name: lib_flushall
 *
 * Description:
 *   Called either (1) by the OS when a task exits, or (2) from fflush()
 *   when a NULL stream argument is provided.
 *
 ****************************************************************************/

int lib_flushall(FAR struct streamlist *list)
{
  int lasterrno = OK;
  int ret = OK;

  /* Make sure that there are streams associated with this thread */

  if (list)
    {
       int i;

       /* Process each stream in the thread's stream list */

       stream_semtake(list);
       for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
         {
           FILE *stream = &list->sl_streams[i];

           /* If the stream is open (i.e., assigned a non-negative file
            * descriptor) and opened for writing, then flush all of the pending
            * write data in the stream.
            */

           if (stream->fs_filedes >= 0 && (stream->fs_oflags & O_WROK) != 0)
             {
               /* Flush the writable FILE */

               if (lib_fflush(stream, true) != 0)
                 {
                   /* An error occurred during the flush AND/OR we were unable
                    * to flush all of the buffered write data.  Return EOF on failure.
                    */

                   lasterrno = get_errno();
                   ret = ERROR;
                 }
             }
         }
       stream_semgive(list);
    }

  /* If any flush failed, return that last failed flush */

  if (ret != OK)
    {
      set_errno(lasterrno);
    }
  return ret;
}