mq_unlink - remove a message queue (REALTIME)
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.
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.
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.
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mq_close(), mq_open(), msgctl(), msgget(), msgrcv(), msgsnd(), the Base Definitions volume of IEEE Std 1003.1-2001, <mqueue.h>
First released in Issue 5. Included for alignment with the POSIX Realtime Extension.
The mq_unlink() function is marked as part of the Message Passing option.
The Open Group Corrigendum U021/5 is applied, clarifying that upon unsuccessful completion, the named message queue is unchanged by this function.
The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Message Passing option.