mq_unlink(3) [netbsd man page]

MQ_UNLINK(3)						   BSD Library Functions Manual 					      MQ_UNLINK(3)

NAME

     mq_unlink -- remove a message queue (REALTIME)

LIBRARY

     POSIX Real-time Library (librt, -lrt)

SYNOPSIS

     #include <mqueue.h>

     int
     mq_unlink(const char *name);

DESCRIPTION

     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 immediately.

RETURN VALUES

     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.

ERRORS

     The mq_unlink() function fails if:

     [EACCES]		Permission is denied to unlink the named message queue.

     [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.

SEE ALSO

     mq(3), mq_open(3)

STANDARDS

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

HISTORY

     The mq_unlink() function first appeared in NetBSD 5.0.

COPYRIGHT

     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 Elec-
     trical 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 .

BSD
								   June 7, 2009 							       BSD

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

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing 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 IEEE Std 1003.1-2001, <mqueue.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							      MQ_CLOSE(3P)