sem_unlink - remove a named semaphore
sem_unlink() removes the named semaphore referred to by
name. The semaphore name is removed immediately. The semaphore is destroyed once all other processes that have the semaphore open close it.
On success sem_unlink() returns 0; on error, -1 is returned, with
errno set to indicate the error.
The caller does not have permission to unlink this semaphore.
name was too long.
There is no semaphore with the given
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