139 lines
4.5 KiB
C
139 lines
4.5 KiB
C
/****************************************************************************
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* binfmt/binfmt_unregister.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <sched.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/binfmt.h>
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#include "binfmt_internal.h"
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#ifndef CONFIG_BINFMT_DISABLE
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: unregister_binfmt
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*
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* Description:
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* Register a loader for a binary format
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*
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* Returned Value:
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* This is a NuttX internal function so it follows the convention that
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int unregister_binfmt(FAR struct binfmt_s *binfmt)
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{
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FAR struct binfmt_s *curr;
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FAR struct binfmt_s *prev;
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int ret = -EINVAL;
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if (binfmt)
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{
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/* Disabling pre-emption should be sufficient protection while
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* accessing the list of registered binary format handlers.
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*/
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sched_lock();
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/* Search the list of registered binary format handlers for the
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* one to be unregistered.
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*/
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for (prev = NULL, curr = g_binfmts;
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curr && curr != binfmt;
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prev = curr, curr = curr->next);
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/* Was it in the list? */
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if (curr)
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{
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/* Yes.. was it at the head of the list? */
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if (!prev)
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{
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/* Yes.. remove it from the head of the list */
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g_binfmts = binfmt->next;
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}
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else
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{
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/* No.. remove it from the middle/end of the list */
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prev->next = binfmt->next;
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}
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binfmt->next = NULL;
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ret = OK;
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}
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sched_unlock();
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}
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return ret;
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}
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#endif /* CONFIG_BINFMT_DISABLE */
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