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



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

NNAAMMEE
       aio_return -- retrieve return status of an asynchronous I/O operation

SSYYNNOOPPSSIISS
       #include <aio.h>

       ssize_t aio_return(struct aiocb *_a_i_o_c_b_p);

DDEESSCCRRIIPPTTIIOONN
       The _a_i_o___r_e_t_u_r_n() function shall return the return status associated
       with the aaiiooccbb structure referenced by the _a_i_o_c_b_p argument. The return
       status for an asynchronous I/O operation is the value that would be
       returned by the corresponding _r_e_a_d(), _w_r_i_t_e(), or _f_s_y_n_c() function
       call. If the error status for the operation is equal to [[EEIINNPPRROOGGRREESSSS]],
       then the return status for the operation is undefined. The _a_i_o___r_e_t_u_r_n()
       function may be called exactly once to retrieve the return status of a
       given asynchronous operation; thereafter, if the same aaiiooccbb structure
       is used in a call to _a_i_o___r_e_t_u_r_n() or _a_i_o___e_r_r_o_r(), an error may be
       returned. When the aaiiooccbb structure referred to by _a_i_o_c_b_p is used to
       submit another asynchronous operation, then _a_i_o___r_e_t_u_r_n() may be
       successfully used to retrieve the return status of that operation.

RREETTUURRNN VVAALLUUEE
       If the asynchronous I/O operation has completed, then the return
       status, as described for _r_e_a_d(), _w_r_i_t_e(), and _f_s_y_n_c(), shall be
       returned. If the asynchronous I/O operation has not yet completed, the
       results of _a_i_o___r_e_t_u_r_n() are undefined.

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

EERRRROORRSS
       The _a_i_o___r_e_t_u_r_n() function may fail if:

       EEIINNVVAALL The _a_i_o_c_b_p argument does not refer to an asynchronous operation
              whose return status has not yet been retrieved.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _a_i_o___c_a_n_c_e_l(), _a_i_o___e_r_r_o_r(), _a_i_o___f_s_y_n_c(), _a_i_o___r_e_a_d(), _a_i_o___w_r_i_t_e(),
       _c_l_o_s_e(), _e_x_e_c, _e_x_i_t(), _f_o_r_k(), _l_i_o___l_i_s_t_i_o(), _l_s_e_e_k(), _r_e_a_d()

       The Base Definitions volume of POSIX.1-2017, <<aaiioo..hh>>

CCOOPPYYRRIIGGHHTT
       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 .



IEEE/The Open Group                  2017                        AIO_RETURN(3)
