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AIO_RETURN(3P)             POSIX Programmer's Manual            AIO_RETURN(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       aio_return - retrieve return status of an asynchronous I/O operation (REALTIME)

SYNOPSIS
       #include <aio.h>

       ssize_t aio_return(struct aiocb *aiocbp);


DESCRIPTION
       The  aio_return() function shall return 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.

RETURN VALUE
       If the asynchronous I/O operation has completed, then the return status, as described for read(), write(),  and
       fsync(),  shall  be  returned.  If  the  asynchronous  I/O  operation  has  not  yet  completed, the results of
       aio_return() are undefined.

ERRORS
       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.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  aio_return() function is part of the Asynchronous Input and Output option and need not be available on all
       implementations.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       aio_cancel(), aio_error(), aio_fsync(), aio_read(), aio_write(), close(), exec(), exit(), fork(), lio_listio(),
       lseek(), read() , the Base Definitions volume of IEEE Std 1003.1-2001, <aio.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  Issue  6,  Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
       Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan-
       dard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                       AIO_RETURN(3P)