text: /****************************************************************************
   * net/procfs/netdev_statistics.c
   *
   *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
   *   Author: Anthony Merlino <anthony@vergeeaero.com>
   *
   * 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 <sys/types.h>
  #include <stdio.h>
  #include <string.h>
  #include <debug.h>
  
  #include <nuttx/mm/iob.h>
  
  #if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_PROCFS) && \
      !defined(CONFIG_FS_PROCFS_EXCLUDE_IOBINFO)
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  struct iob_userstats_s g_iobuserstats[IOBUSER_NENTRIES];
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: iob_stats_onalloc
   *
   * Description:
   *   An IOB has just been allocated for the consumer. This is a hook for the
   *   IOB statistics to be updated when /proc/iobinfo is enabled.
   *
   * Input Parameters:
   *   consumerid - id representing who is consuming the IOB
   *
   * Returned Value:
   *   None.
   *
   ****************************************************************************/
  
  void iob_stats_onalloc(enum iob_user_e consumerid)
  {
    DEBUGASSERT(consumerid < IOBUSER_NENTRIES);
    g_iobuserstats[consumerid].totalconsumed++;
  
    /* Increment the global statistic as well */
  
    g_iobuserstats[IOBUSER_GLOBAL].totalconsumed++;
  }
  
  /****************************************************************************
   * Name: iob_stats_onfree
   *
   * Description:
   *   An IOB has just been freed by the producer. This is a hook for the
   *   IOB statistics to be updated when /proc/iobinfo is enabled.
   *
   * Input Parameters:
   *   consumerid - id representing who is consuming the IOB
   *
   * Returned Value:
   *   None.
   *
   ****************************************************************************/
  
  void iob_stats_onfree(enum iob_user_e producerid)
  {
    DEBUGASSERT(producerid < IOBUSER_NENTRIES);
    g_iobuserstats[producerid].totalproduced++;
  
    /* Increment the global statistic as well */
  
    g_iobuserstats[IOBUSER_GLOBAL].totalproduced++;
  }
  
  /****************************************************************************
   * Name: iob_getuserstats
   *
   * Description:
   *   Return a reference to the IOB usage statistics for the IOB consumer/producer
   *
   * Input Parameters:
   *   userid - id representing the IOB producer/consumer
   *
   * Returned Value:
   *   None.
   *
   ****************************************************************************/
  
  FAR struct iob_userstats_s * iob_getuserstats(enum iob_user_e userid)
  {
    DEBUGASSERT(userid < IOBUSER_NENTRIES);
    return &g_iobuserstats[userid];
  }
  
  #endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS &&
          * !CONFIG_FS_PROCFS_EXCLUDE_IOBINFO */
  