mq_open Hanging

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LEARN ABOUT CENTOS

mq_unlink

MQ_UNLINK(3P)						     POSIX Programmer's Manual						     MQ_UNLINK(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_unlink - remove a message queue (REALTIME)

SYNOPSIS

       #include <mqueue.h>

       int mq_unlink(const char *name);

DESCRIPTION

       The mq_unlink() function shall remove the message queue named by the pathname name. After a successful call to  mq_unlink()  with  name,  a
       call  to  mq_open() with name shall fail 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 shall be postponed until all references to the message queue have been closed.

       Calls to mq_open() 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 VALUE

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

ERRORS

       The mq_unlink() function shall fail 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.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       mq_close(), mq_open(), 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_UNLINK(3P)

Programming