aio_return(3p) [suse man page]

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)

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AIO_RETURN(3)                                                Linux Programmer's Manual                                               AIO_RETURN(3)

NAME

       aio_return - get return status of asynchronous I/O operation

SYNOPSIS

       #include <aio.h>

       ssize_t aio_return(struct aiocb *aiocbp);

       Link with -lrt.

DESCRIPTION

       The  aio_return()  function returns the final return status for the asynchronous I/O request with control block pointed to by aiocbp.  (See
       aio(7) for a description of the aiocb structure.)

       This function should be called only once for any given request, after aio_error(3) returns something other than EINPROGRESS.

RETURN VALUE

       If the asynchronous I/O operation has completed, this function returns the value that would have been returned in  case  of  a  synchronous
       read(2), write(2), fsync(2) or fdatasync(2), call.  On error, -1 is returned, and errno is set appropriately.

       If the asynchronous I/O operation has not yet completed, the return value and effect of aio_return() are undefined.

ERRORS

       EINVAL aiocbp does not point at a control block for an asynchronous I/O request of which the return status has not been retrieved yet.

       ENOSYS aio_return() is not implemented.

VERSIONS

       The aio_return() function is available since glibc 2.1.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-------------+---------------+---------+
       |Interface    | Attribute     | Value   |
       +-------------+---------------+---------+
       |aio_return() | Thread safety | MT-Safe |
       +-------------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

EXAMPLE

       See aio(7).

SEE ALSO

       aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3), aio_suspend(3), aio_write(3), lio_listio(3), aio(7)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

                                                                    2017-09-15                                                       AIO_RETURN(3)

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aio_return(3p) [suse man page]

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