119 lines
5.0 KiB
C
119 lines
5.0 KiB
C
/****************************************************************************
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* libc/aio/aio_return.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <aio.h>
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#include <assert.h>
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#include <errno.h>
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#ifdef CONFIG_LIBC_AIO
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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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: aio_return
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*
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* Description:
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* The aio_return() function returns the return status associated with
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* the aiocb structure referenced by the aiocbp argument. The return
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* status for an asynchronous I/O operation is the value that would be
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* returned by the corresponding read(), write(), or fsync() function
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* call. If the error status for the operation is equal to EINPROGRESS,
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* then the return status for the operation is undefined. The aio_return()
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* function may be called exactly once to retrieve the return status of
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* a given asynchronous operation; thereafter, if the same aiocb structure
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* is used in a call to aio_return() or aio_error(), an error may be
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* returned. When the aiocb structure referred to by aiocbp is used to
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* submit another asynchronous operation, then aio_return() may be
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* successfully used to retrieve the return status of that operation.
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*
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* Input Parameters:
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* aiocbp - A pointer to an instance of struct aiocb
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*
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* Returned Value:
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* If the asynchronous I/O operation has completed, then the return
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* status, as described for read(), write(), and fsync(), will be
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* returned. If the asynchronous I/O operation has not yet completed,
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* the results of aio_return() are undefined.
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*
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* The aio_return() function may fail if:
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*
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* EINVAL - The aiocbp argument does not refer to an asynchronous
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* operation whose return status has not yet been retrieved.
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*
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****************************************************************************/
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ssize_t aio_return(FAR struct aiocb *aiocbp)
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{
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DEBUGASSERT(aiocbp);
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if (aiocbp->aio_result < 0)
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{
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set_errno((int)-aiocbp->aio_result);
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return (ssize_t)ERROR;
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}
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return aiocbp->aio_result;
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}
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#endif /* CONFIG_LIBC_AIO */
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