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MQ_UNLINK(3)               Library Functions Manual               MQ_UNLINK(3)

     mq_unlink - remove a message queue (REALTIME)

     POSIX Real-time Library (librt, -lrt)

     #include <mqueue.h>

     mq_unlink(const char *name);

     The mq_unlink() function removes the message queue named by the pathname
     name.  After a successful call to mq_unlink() with name, a call to
     mq_open(3) with name fails if the flag O_CREAT is not set in flags.  If
     one or more processes have the message queue open when mq_unlink() is
     called, destruction of the message queue will be postponed until all
     references to the message queue have been closed.

     Calls to mq_open(3) to recreate the message queue may fail until the
     message queue is actually removed.  However, the mq_unlink() call need
     not block until all references have been closed; it may return

     Upon successful completion, the function returns a value of zero.
     Otherwise, the named message queue will be unchanged by this function
     call, and the function returns a value of -1 and sets the global variable
     errno to indicate the error.

     The mq_unlink() function fails if:

     [EACCES]           Permission is denied to unlink the named message

     [ENAMETOOLONG]     The length of the name argument exceeds {PATH_MAX} or
                        a pathname component is longer than {NAME_MAX}.

     [ENOENT]           The named message queue does not exist.

     mq(3), mq_open(3)

     This function conforms to the IEEE Std 1003.1-2001 ("POSIX.1") standard.

     The mq_unlink() function first appeared in NetBSD 5.0.

     Portions of this text are reprinted and reproduced in electronic form
     from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
     -- Portable Operating System Interface (POSIX), The Open Group Base
     Specifications Issue 6, Copyright (C) 2001-2003 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

NetBSD 8.0                       June 7, 2009                       NetBSD 8.0