1AIO_RETURN(3P)             POSIX Programmer's Manual            AIO_RETURN(3P)
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PROLOG

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

12       aio_return - retrieve return status of an  asynchronous  I/O  operation
13       (REALTIME)
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SYNOPSIS

16       #include <aio.h>
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18       ssize_t aio_return(struct aiocb *aiocbp);
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DESCRIPTION

22       The  aio_return()  function  shall  return the return status associated
23       with the aiocb structure referenced by the aiocbp argument. The  return
24       status  for  an  asynchronous  I/O operation is the value that would be
25       returned by the corresponding  read(),  write(),  or  fsync()  function
26       call.  If the error status for the operation is equal to [EINPROGRESS],
27       then the return status for the operation is undefined. The aio_return()
28       function  may be called exactly once to retrieve the return status of a
29       given asynchronous operation; thereafter, if the same  aiocb  structure
30       is  used  in  a  call  to  aio_return() or aio_error(), an error may be
31       returned.  When the aiocb structure referred to by aiocbp  is  used  to
32       submit  another  asynchronous  operation, then aio_return() may be suc‐
33       cessfully used to retrieve the return status of that operation.
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RETURN VALUE

36       If the asynchronous I/O operation has completed, then the  return  sta‐
37       tus,  as described for read(), write(), and fsync(), shall be returned.
38       If the asynchronous I/O operation has not yet completed, the results of
39       aio_return() are undefined.
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ERRORS

42       The aio_return() function may fail if:
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44       EINVAL The  aiocbp argument does not refer to an asynchronous operation
45              whose return status has not yet been retrieved.
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48       The following sections are informative.
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EXAMPLES

51       None.
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APPLICATION USAGE

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

58       None.
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FUTURE DIRECTIONS

61       None.
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SEE ALSO

64       aio_cancel(),   aio_error(),   aio_fsync(),   aio_read(),  aio_write(),
65       close(), exec(), exit(), fork(), lio_listio(), lseek(),  read()  ,  the
66       Base Definitions volume of IEEE Std 1003.1-2001, <aio.h>
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69       Portions  of  this text are reprinted and reproduced in electronic form
70       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
71       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
72       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
73       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
74       event of any discrepancy between this version and the original IEEE and
75       The  Open Group Standard, the original IEEE and The Open Group Standard
76       is the referee document. The original Standard can be  obtained  online
77       at http://www.opengroup.org/unix/online.html .
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81IEEE/The Open Group                  2003                       AIO_RETURN(3P)
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