nuttx/libc/misc/lib_init.c

/************************************************************
 * libc/misc/lib_init.c
 *
 *   Copyright (C) 2007, 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 <stdio.h>
#include <string.h>
#include <errno.h>

#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/lib.h>

#include "lib_internal.h"

#if !defined(CONFIG_NUTTX_KERNEL) || defined(__KERNEL__)

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

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

/************************************************************
 * Private Functions
 ************************************************************/

/************************************************************
 * Public Functions
 ************************************************************/

/************************************************************
 * Name: lib_initialize
 ************************************************************/

/* General library initialization hook */

void weak_const_function lib_initialize(void)
{
}

/************************************************************
 * Name: lib_streaminit
 ************************************************************/

#if CONFIG_NFILE_STREAMS > 0
/* The following function is called when a new task is allocated.  It
 * initializees the streamlist instance that is stored in the task group.
 */

void lib_streaminit(FAR struct streamlist *list)
{
  int i;

  /* Initialize the list access mutex */

  (void)sem_init(&list->sl_sem, 0, 1);

  /* Initialize each FILE structure */

  for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
   {
     /* Clear the IOB */

      memset(&list->sl_streams[i], 0, sizeof(FILE));

      /* Indicate not opened */

      list->sl_streams[i].fs_fd = -1;

      /* Initialize the stream semaphore to one to support one-at-
       * a-time access to private data sets.
       */

      lib_sem_initialize(&list->sl_streams[i]);
    }
}

/* This function is called when a TCB is destroyed.  Note that is
 * does not close the files by releasing the inode.  This happens
 * separately when the file descriptor list is freed.
 */

void lib_releaselist(FAR struct streamlist *list)
{
#if CONFIG_STDIO_BUFFER_SIZE > 0
  int i;
#endif

  DEBUGASSERT(list);

  /* Destroy the semaphore and release the filelist */

  (void)sem_destroy(&list->sl_sem);

  /* Release each stream in the list */

#if CONFIG_STDIO_BUFFER_SIZE > 0
  for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
    {
      /* Destroy the semaphore that protects the IO buffer */

      (void)sem_destroy(&list->sl_streams[i].fs_sem);

      /* Release the IO buffer */

      if (list->sl_streams[i].fs_bufstart)
        {
          sched_ufree(list->sl_streams[i].fs_bufstart);
        }
    }
#endif
}

#endif /* !CONFIG_NUTTX_KERNEL || __KERNEL__ */
#endif /* CONFIG_NFILE_STREAMS */