text: Close a message queue
  #include <mqueue.h> int mq_close( mqd_t mqdes );
  Use the -l c option to qcc to link against this library. This library is usually included automatically.
  Use the -l mq option to qcc to link against this library.
  The mq_close() function removes the association between mqdes and a message queue. If the current process attaches a notify to this queue for notification, the attachment is eliminated. If this queue is unlinked before the call to mq_close(), and this process is the last process to call mq_close() on the queue, then the queue is destroyed, along with its contents.
  In the traditional (mqueue) implementation, calling close() with mqdes has the same effect as calling mq_close().