MQ_UNLINK(3)               POSIX Programmer's Manual              MQ_UNLINK(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_unlink -- remove a message queue (RREEAALLTTIIMMEE)

SSYYNNOOPPSSIISS
       #include <mqueue.h>

       int mq_unlink(const char *_n_a_m_e);

DDEESSCCRRIIPPTTIIOONN
       The _m_q___u_n_l_i_n_k() function shall remove the message queue named by the
       string name.  If one or more processes have the message queue open when
       _m_q___u_n_l_i_n_k() is called, destruction of the message queue shall be
       postponed until all references to the message queue have been closed.
       However, the _m_q___u_n_l_i_n_k() call need not block until all references have
       been closed; it may return immediately.

       After a successful call to _m_q___u_n_l_i_n_k(), reuse of the name shall
       subsequently cause _m_q___o_p_e_n() to behave as if no message queue of this
       name exists (that is, _m_q___o_p_e_n() will fail if O_CREAT is not set, or
       will create a new message queue if O_CREAT is set).

RREETTUURRNN VVAALLUUEE
       Upon successful completion, the function shall return a value of zero.
       Otherwise, the named message queue shall be unchanged by this function
       call, and the function shall return a value of -1 and set _e_r_r_n_o to
       indicate the error.

EERRRROORRSS
       The _m_q___u_n_l_i_n_k() function shall fail if:

       EEAACCCCEESS Permission is denied to unlink the named message queue.

       EEIINNTTRR  The call to _m_q___u_n_l_i_n_k() blocked waiting for all references to
              the named message queue to be closed and a signal interrupted
              the call.

       EENNOOEENNTT The named message queue does not exist.

       The _m_q___u_n_l_i_n_k() function may fail if:

       EENNAAMMEETTOOOOLLOONNGG
              The length of the _n_a_m_e argument exceeds {_POSIX_PATH_MAX} on
              systems that do not support the XSI option or exceeds
              {_XOPEN_PATH_MAX} on XSI systems, or has a pathname component
              that is longer than {_POSIX_NAME_MAX} on systems that do not
              support the XSI option or longer than {_XOPEN_NAME_MAX} on XSI
              systems.  A call to _m_q___u_n_l_i_n_k() with a _n_a_m_e argument that
              contains the same message queue name as was previously used in a
              successful _m_q___o_p_e_n() call shall not give an [[EENNAAMMEETTOOOOLLOONNGG]]
              error.

       _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
       A future version might require the _m_q___o_p_e_n() and _m_q___u_n_l_i_n_k() functions
       to have semantics similar to normal file system operations.

SSEEEE AALLSSOO
       _m_q___c_l_o_s_e(), _m_q___o_p_e_n(), _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_UNLINK(3)
