aio_return

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 asyn-
       chronous 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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