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sem_close - close a named semaphore
int sem_close(sem_t *sem);
sem_close() closes the named semaphore referred to by sem, allowing any
resources that the system has allocated to the calling process for this
semaphore to be freed.
On success sem_close() returns 0; on error, -1 is returned, with errno
set to indicate the error.
EINVAL sem is not a valid semaphore.
All open named semaphores are automatically closed on process
termination, or upon execve(2).
sem_getvalue(3), sem_open(3), sem_post(3), sem_unlink(3), sem_wait(3),
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