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.1‐2008, <aio.h>

COPYRIGHT

       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
       http://www.unix.org/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 .