Updated: April 19, 2023 |
Remove a queue
#include <mqueue.h> int mq_unlink( const char* name );
The mq_unlink() function removes the queue with the given name.
If some process has the queue open when the call to mq_unlink() is made, then the actual deletion of the queue is postponed until it has been closed. If a queue exists in the netherworld between unlinking and the actual removal of the queue, then all calls to open a queue with the given name fail (even if O_CREAT is present in oflag). Once the queue is deleted, all elements currently on it are freed. Due to the lazy deletion of queues, it's impossible for any process to be blocked on the message queue when it's deleted.
Calling unlink() with a name that resolves to the message queue server's namespace (e.g., /dev/mqueue/my_queue) is analogous to calling mq_unlink() with name set to the last elements of the pathname (e.g., my_queue).
-1 if the queue wasn't successfully unlinked (errno is set). Any other value indicates that the queue was successfully unlinked.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |