The sys/shm.h header file exists The header define the following symbolic constants: - SHM_RDONLY - SHM_RND The header define the following symbolic value: - SHMLBA The header define the following type through typedef: - shmatt_t The shmatt_t type is an unsigned integer that must be able to store values at least as large than unsigned short. The header declares struct shmid_ds with the members below, at a minimum: struct ipc_perm shm_perm size_t shm_segsz pid_t shm_lpid pid_t shm_cpid shmatt_t shm_nattach time_t shm_atime time_t shm_dtime time_t shm_ctime The pid_t, time_t, key_t, and size_t types shall be defined as described in sys/types.h This function is defined: void *shmat(int, const void *, int) This function is defined: int shmctl(int, int, struct shmid_ds *) This function is defined: int shmdt(const void *) This function is defined: int shmget(key_t, size_t, int) All of the symbols from sys/ipc.h are defined when the sys/shm.h header is included