...generate a key_t type System V IPC key, suitable for use with msgget (2), semget (2), or shmget (2). The resulting value is the same for all pathnames that name the same file, w…...sses, and should be located in a region of shared memory (see shm_open (3), mmap (2), and shmget (2)). (Since a child created by fork (2) inherits its parent's memory mappings, …...LOCK operation, where it sets a maximum on the total bytes in shared memory segments (see shmget (2)) that may be locked by the real user ID of the calling process. The shmctl (…