sem_close - close a named semaphore
#include <semaphore.h> int sem_close(sem_t *sem);
sem_close() closes the named semaphore referred to
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
errno set to indicate the error.
sem is not a valid semaphore.
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