1MQ_UNLINK(3P)              POSIX Programmer's Manual             MQ_UNLINK(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

12       mq_unlink — remove a message queue (REALTIME)
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SYNOPSIS

15       #include <mqueue.h>
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17       int mq_unlink(const char *name);
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DESCRIPTION

20       The mq_unlink() function shall remove the message queue  named  by  the
21       string name.  If one or more processes have the message queue open when
22       mq_unlink() is called, destruction of the message queue shall be  post‐
23       poned  until all references to the message queue have been closed. How‐
24       ever, the mq_unlink() call need not block  until  all  references  have
25       been closed; it may return immediately.
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27       After  a successful call to mq_unlink(), reuse of the name shall subse‐
28       quently cause mq_open() to behave as if no message queue of  this  name
29       exists  (that  is,  mq_open()  will fail if O_CREAT is not set, or will
30       create a new message queue if O_CREAT is set).
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RETURN VALUE

33       Upon successful completion, the function shall return a value of  zero.
34       Otherwise,  the named message queue shall be unchanged by this function
35       call, and the function shall return a value of  -1  and  set  errno  to
36       indicate the error.
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ERRORS

39       The mq_unlink() function shall fail if:
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41       EACCES Permission is denied to unlink the named message queue.
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43       EINTR  The  call  to  mq_unlink() blocked waiting for all references to
44              the named message queue to be closed and  a  signal  interrupted
45              the call.
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47       ENOENT The named message queue does not exist.
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49       The mq_unlink() function may fail if:
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51       ENAMETOOLONG
52              The  length  of  the  name argument exceeds {_POSIX_PATH_MAX} on
53              systems  that  do  not  support  the  XSI  option   or   exceeds
54              {_XOPEN_PATH_MAX}  on  XSI  systems, or has a pathname component
55              that is longer than {_POSIX_NAME_MAX} on  systems  that  do  not
56              support  the  XSI option or longer than {_XOPEN_NAME_MAX} on XSI
57              systems.  A call to mq_unlink() with a name argument  that  con‐
58              tains  the  same  message queue name as was previously used in a
59              successful mq_open()  call  shall  not  give  an  [ENAMETOOLONG]
60              error.
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62       The following sections are informative.
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EXAMPLES

65       None.
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APPLICATION USAGE

68       None.
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RATIONALE

71       None.
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FUTURE DIRECTIONS

74       A  future version might require the mq_open() and mq_unlink() functions
75       to have semantics similar to normal file system operations.
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SEE ALSO

78       mq_close(), mq_open(), msgctl(), msgget(), msgrcv(), msgsnd()
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80       The Base Definitions volume of POSIX.1‐2017, <mqueue.h>
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83       Portions of this text are reprinted and reproduced in  electronic  form
84       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
85       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
86       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
87       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
88       event of any discrepancy between this version and the original IEEE and
89       The Open Group Standard, the original IEEE and The Open Group  Standard
90       is  the  referee document. The original Standard can be obtained online
91       at http://www.opengroup.org/unix/online.html .
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93       Any typographical or formatting errors that appear  in  this  page  are
94       most likely to have been introduced during the conversion of the source
95       files to man page format. To report such errors,  see  https://www.ker
96       nel.org/doc/man-pages/reporting_bugs.html .
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100IEEE/The Open Group                  2017                        MQ_UNLINK(3P)
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