nuttx/libc/modlib/modlib_uninit.c

/****************************************************************************
 * libc/modlib/modlib_uninit.c
 *
 *   Copyright (C) 2015. 2017 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 <unistd.h>
#include <debug.h>
#include <errno.h>

#include <nuttx/kmalloc.h>
#include <nuttx/module.h>
#include <nuttx/lib/modlib.h>

#include "libc.h"
#include "modlib/modlib.h"

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

/****************************************************************************
 * Name: modlib_uninitialize
 *
 * Description:
 *   Releases any resources committed by modlib_initialize().  This
 *   essentially undoes the actions of modlib_initialize.
 *
 * Returned Value:
 *   0 (OK) is returned on success and a negated errno is returned on
 *   failure.
 *
 ****************************************************************************/

int modlib_uninitialize(struct mod_loadinfo_s *loadinfo)
{
  /* Free all working buffers */

  modlib_freebuffers(loadinfo);

  /* Close the ELF file */

  if (loadinfo->filfd >= 0)
    {
      close(loadinfo->filfd);
    }

  return OK;
}

/****************************************************************************
 * Name: modlib_freebuffers
 *
 * Description:
 *  Release all working buffers.
 *
 * Returned Value:
 *   0 (OK) is returned on success and a negated errno is returned on
 *   failure.
 *
 ****************************************************************************/

int modlib_freebuffers(struct mod_loadinfo_s *loadinfo)
{
  /* Release all working allocations  */

  if (loadinfo->shdr != NULL)
    {
      lib_free((FAR void *)loadinfo->shdr);
      loadinfo->shdr      = NULL;
    }

  if (loadinfo->iobuffer != NULL)
    {
      lib_free((FAR void *)loadinfo->iobuffer);
      loadinfo->iobuffer  = NULL;
      loadinfo->buflen    = 0;
    }

  return OK;
}