Close a message queue descriptor
#include <mqueue.h> int mq_close(mqd_t mqdes);
Link with -lrt.
mq_close() closes the message queue descriptor mqdes.
If the calling process has attached a notification request to this message queue via mqdes, then this request is removed, and another process can now attach a notification request.
On success mq_close() returns 0; on error, -1 is returned, with errno set to indicate the error.
The descriptor specified in mqdes is invalid.
The mq_close() function is thread-safe.
All open message queues are automatically closed on process termination, or upon execve(2).
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