Walkers

msg

Walk the active msqid_ds structures corresponding to message queue identifiers. This structure is defined in <sys/msg.h>.

sem

Walk the active semid_ds structures corresponding to semaphore identifiers. This structure is defined in <sys/sem.h>.

shm

Walk the active shmid_ds structures corresponding to shared memory segment identifiers. This structure is defined in <sys/shm.h>.