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