centos man page for aio_return

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 differ (consult the correspond-
       ing 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 opera-
       tion.

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, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications 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 Standard, 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)