PROLOG

       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.

NAME

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

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.

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

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

       None.

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 POSIX.1‐2017, <aio.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .