|
|
/****************************************************************************
* binfmt/binfmt_unregister.c
*
* Copyright (C) 2009 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 <string.h>
#include <sched.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/binfmt/binfmt.h>
#include "binfmt_internal.h"
#ifndef CONFIG_BINFMT_DISABLE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: unregister_binfmt
*
* Description:
* Register a loader for a binary format
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int unregister_binfmt(FAR struct binfmt_s *binfmt)
{
FAR struct binfmt_s *curr;
FAR struct binfmt_s *prev;
int ret = -EINVAL;
if (binfmt)
{
/* Disabling pre-emption should be sufficient protection while
* accessing the list of registered binary format handlers.
*/
sched_lock();
/* Search the list of registered binary format handlers for the
* one to be unregistered.
*/
for (prev = NULL, curr = g_binfmts;
curr && curr != binfmt;
prev = curr, curr = curr->next);
/* Was it in the list? */
if (curr)
{
/* Yes.. was it at the head of the list? */
if (!prev)
{
/* Yes.. remove it from the head of the list */
g_binfmts = binfmt->next;
}
else
{
/* No.. remove it from the middle/end of the list */
prev->next = binfmt->next;
}
binfmt->next = NULL;
ret = OK;
}
sched_unlock();
}
return ret;
}
#endif /* CONFIG_BINFMT_DISABLE */
|
