nuttx/libs/libc/stdio/lib_libflushall.c

/****************************************************************************
 * libs/libc/stdio/lib_libflushall.c
 *
 *   Copyright (C) 2007-2009, 2011-2013 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 <stdbool.h>
#include <fcntl.h>
#include <errno.h>

#include <nuttx/fs/fs.h>

#include "libc.h"

/****************************************************************************
 * Public 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;

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

              ret = lib_fflush(stream, true);
              if (ret < 0)
                {
                  /* An error occurred during the flush AND/OR we were unable
                   * to flush all of the buffered write data.  Remember the
                   * last errcode.
                   */

                  lasterrno = ret;
                }
            }
        }

      stream_semgive(list);
    }

  /* If any flush failed, return the errorcode of the last failed flush */

  return lasterrno;
}