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What is the output of this program? #include<stdio.h> #include<fcntl.h> #include<sys/stat.h> #include<semaphore.h> int main() { sem_t* sem_id; int value; sem_id = sem_open("sem_value",O_CREAT,0666,0); if(sem_id == SEM_FAILED) perror("sem_open"); if(sem_getvalue(sem_id,&value) == -1) perror("sem_getvalue"); printf("%d\n",value); sem_wait(sem_id); printf("Examveda\n"); if(sem_close(sem_id) == -1) perror("sem_close"); return 0; }