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MQ_UNLINK

MQ_UNLINK

Section: POSIX Programmer's Manual (P) Updated: 2003
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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 function 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 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 http://www.opengroup.org/unix/online.html .


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
EXAMPLES
APPLICATION USAGE
RATIONALE
FUTURE DIRECTIONS
SEE ALSO
COPYRIGHT

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