man-pages version 3.22, Gentoo linux $ man shm_overview In the NOTES section, second sentence: " System V shared memory (shmget(2), shmop(2), etc.) is an older semaphore API. " It's not a semaphore API, it's a shared memory API. Perhaps this is a paste-o from the sem_overview man page. Tim -- Tim Stoakes -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html