...xisting PROT_READ , PROT_WRITE , and PROT_EXEC permissions passed to system calls such as mprotect (2) and mmap (2), but always act to further restrict these traditional permiss…...y. SEE ALSO fchmod (2), fchown (2), fstat (2), ftruncate (2), memfd_create (2), mmap (2), mprotect (2), munmap (2), shmget (2), shmop (2), shm_open (3), shm_unlink (3), sem_over…...: mlock () munlock () MPR - _POSIX_MEMORY_PROTECTION - _SC_MEMORY_PROTECTION The function mprotect () is present. MSG - _POSIX_MESSAGE_PASSING - _SC_MESSAGE_PASSING The include …