MQ_SETATTR(3)              POSIX Programmer's Manual             MQ_SETATTR(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
       mq_setattr -- set message queue attributes (RREEAALLTTIIMMEE)

SSYYNNOOPPSSIISS
       #include <mqueue.h>

       int mq_setattr(mqd_t _m_q_d_e_s, const struct mq_attr *restrict _m_q_s_t_a_t,
           struct mq_attr *restrict _o_m_q_s_t_a_t);

DDEESSCCRRIIPPTTIIOONN
       The _m_q___s_e_t_a_t_t_r() function shall set attributes associated with the open
       message queue description referenced by the message queue descriptor
       specified by _m_q_d_e_s.

       The message queue attributes corresponding to the following members
       defined in the mmqq__aattttrr structure shall be set to the specified values
       upon successful completion of _m_q___s_e_t_a_t_t_r():

       _m_q___f_l_a_g_s    The value of this member is the bitwise-logical OR of zero
                   or more of O_NONBLOCK and any implementation-defined flags.

       The values of the _m_q___m_a_x_m_s_g, _m_q___m_s_g_s_i_z_e, and _m_q___c_u_r_m_s_g_s members of the
       mmqq__aattttrr structure shall be ignored by _m_q___s_e_t_a_t_t_r().

       If _o_m_q_s_t_a_t is non-NULL, the _m_q___s_e_t_a_t_t_r() function shall store, in the
       location referenced by _o_m_q_s_t_a_t, the previous message queue attributes
       and the current queue status.  These values shall be the same as would
       be returned by a call to _m_q___g_e_t_a_t_t_r() at that point.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, the function shall return a value of zero
       and the attributes of the message queue shall have been changed as
       specified.

       Otherwise, the message queue attributes shall be unchanged, and the
       function shall return a value of -1 and set _e_r_r_n_o to indicate the
       error.

EERRRROORRSS
       The _m_q___s_e_t_a_t_t_r() function shall fail if:

       EEBBAADDFF  The _m_q_d_e_s argument is not a valid message queue descriptor.

       _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
       _m_q___o_p_e_n(), _m_q___s_e_n_d(), _m_s_g_c_t_l(), _m_s_g_g_e_t(), _m_s_g_r_c_v(), _m_s_g_s_n_d()

       The Base Definitions volume of POSIX.1-2017, <<mmqquueeuuee..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                        MQ_SETATTR(3)
