NAME
mq_unlink – mq_unlink - remove a message queue (REALTIME)
LIBRARY
library “librt”
SYNOPSIS
#include <mqueue.h>
int
mq_unlink(const char *name);
DESCRIPTION
The mq_unlink() function removes the message queue named by the string name. 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. However, the mq_unlink() call need not block until all references have been closed; it may return immediately.
After a successful call to mq_unlink(), reuse of the name will subsequently cause mq_open(2) to behave as if no message queue of this name exists.
RETURN VALUES
The mq_unlink() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORS
The mq_unlink() system call will fail if:
- [EACCESS]
-
Permission is denied to unlink the message queue represented by name.
- [EINVAL]
-
name is invalid.
- [ENAMETOOLONG]
-
The length of the name argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.
- [ENOENT]
-
The message queue does not exist.
- [ENOSYS]
-
mqueuefs(4) module is neither loaded nor included in the kernel.
SEE ALSO
STANDARDS
The mq_unlink() system call conforms to IEEE Std 1003.1-2004 (“POSIX.1”). The [EACCESS] error code is an extension to the standard.
HISTORY
Support for POSIX message queues first appeared in FreeBSD 7.0.
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 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.