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


       aio_return — retrieve return status of an asynchronous I/O operation


       #include <aio.h>

       ssize_t aio_return(struct aiocb *aiocbp);


       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.


       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.

       If the aio_return() function fails, it shall return −1  and  set  errno  to  indicate  the


       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.










       aio_cancel(), aio_error(), aio_fsync(), aio_read(), aio_write(),  close(),  exec,  exit(),
       fork(), lio_listio(), lseek(), read()

       The Base Definitions volume of POSIX.1‐2008, <aio.h>


       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2013 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX),  The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical  Corrigendum  1  applied.)  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 .

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