1MQ_CLOSE(3P)               POSIX Programmer's Manual              MQ_CLOSE(3P)
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PROLOG

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

13       mq_close — close a message queue (REALTIME)
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SYNOPSIS

16       #include <mqueue.h>
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18       int mq_close(mqd_t mqdes);
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DESCRIPTION

21       The mq_close() function shall remove the association between  the  mes‐
22       sage  queue  descriptor,  mqdes,  and its message queue. The results of
23       using this message queue descriptor after successful return  from  this
24       mq_close(),  and until the return of this message queue descriptor from
25       a subsequent mq_open(), are undefined.
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27       If the process has successfully attached a notification request to  the
28       message queue via this mqdes, this attachment shall be removed, and the
29       message queue is available for another process to attach for  notifica‐
30       tion.
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RETURN VALUE

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

38       The mq_close() function shall fail if:
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40       EBADF  The mqdes argument is not a valid message queue descriptor.
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42       The following sections are informative.
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EXAMPLES

45       None.
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APPLICATION USAGE

48       None.
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RATIONALE

51       None.
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FUTURE DIRECTIONS

54       None.
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SEE ALSO

57       mq_open(), mq_unlink(), msgctl(), msgget(), msgrcv(), msgsnd()
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59       The Base Definitions volume of POSIX.1‐2008, <mqueue.h>
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62       Portions  of  this text are reprinted and reproduced in electronic form
63       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
64       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
65       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
66       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
67       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
68       event of any discrepancy between this version and the original IEEE and
69       The Open Group Standard, the original IEEE and The Open Group  Standard
70       is  the  referee document. The original Standard can be obtained online
71       at http://www.unix.org/online.html .
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73       Any typographical or formatting errors that appear  in  this  page  are
74       most likely to have been introduced during the conversion of the source
75       files to man page format. To report such errors,  see  https://www.ker‐
76       nel.org/doc/man-pages/reporting_bugs.html .
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80IEEE/The Open Group                  2013                         MQ_CLOSE(3P)
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