PROLOG

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

NAME

       mq_close — close a message queue (REALTIME)

SYNOPSIS

       #include <mqueue.h>

       int mq_close(mqd_t mqdes);

DESCRIPTION

       The mq_close() function shall remove the association between the message queue descriptor,
       mqdes, and its message queue. The results of using this  message  queue  descriptor  after
       successful  return  from  this  mq_close(),  and  until  the  return of this message queue
       descriptor from a subsequent mq_open(), are undefined.

       If the process has successfully attached a notification request to the message  queue  via
       this  mqdes,  this  attachment  shall  be  removed, and the message queue is available for
       another process to attach for notification.

RETURN VALUE

       Upon successful completion,  the  mq_close()  function  shall  return  a  value  of  zero;
       otherwise, the function shall return a value of -1 and set errno to indicate the error.

ERRORS

       The mq_close() function shall fail if:

       EBADF  The mqdes argument is not a valid message queue descriptor.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       mq_open(), mq_unlink(), msgctl(), msgget(), msgrcv(), msgsnd()

       The Base Definitions volume of POSIX.1‐2017, <mqueue.h>

COPYRIGHT

       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 .