...sgsnd (2) and msgrcv (2) operations on message queues, the time of the last shmat (2) and shmdt (2) operations on shared memory, and the time of the last semop (2) operation on …...ared memory object is only removed after all currently attached processes have detached ( shmdt (2)) the object from their virtual address space. Two syntax styles are supported…...sgsnd (2) and msgrcv (2) operations on message queues, the time of the last shmat (2) and shmdt (2) operations on shared memory, and the time of the last semop (2) operation on …