C- Semaphore sem_getvalue not returning what I'm expecting?

I've been trying to get myself more acquainted with semaphores and was wondering why this code isn't printing the value I expect. ``` #include <semaphore.h> #include <stdio.h> #include <stdlib.h> int main(int argc, char * argv[]) { sem_t sem; sem_init(&sem, 0, 1); int value; sem_getvalue(&sem, &value); printf("%d\n",value); return 0; } ``` It prints 0 for the value. But from my understanding it should be getting the value I initialized the semaphore with which is 1? I tried using a semaphore in some code with pthreads and I initialized the semaphore with a value of 1, but when I called the sem_getvalue function it was printing 32767. Am I missing something here? Thanks in advance. Edit: sem_init and sem_getvalue both return -1 Edit: Solved. It appears unnamed semaphores aren't implemented on Mac.