The munmap( ) function shall remove any mappings for those entire pages containing any part of the address space of the process starting at addr and continuing for len bytes. Further references to these pages shall result in the generation of a SIGSEGV signal to the process. If there are no mappings in the specified address range, then munmap( ) has no effect. The implementation shall require that addr be a multiple of the page size {PAGESIZE}. If a mapping to be removed was private, any modifications made in this address range shall be discarded. ML|MLR Any memory locks (see mlock( ) and mlockall ( )) associated with this address range shall be removed, as if by an appropriate call to munlock( ). TYM If a mapping removed from a typed memory object causes the corresponding address range of the memory pool to be inaccessible by any process in the system except through allocatable mappings (that is, mappings of typed memory objects opened with the POSIX_TYPED_MEM_MAP_ALLOCATABLE flag), then that range of the memory pool shall become deallocated and may become available to satisfy future typed memory allocation requests. A mapping removed from a typed memory object opened with the POSIX_TYPED_MEM_MAP_ALLOCATABLE flag shall not affect in any way the availability of that typed memory for allocation. Upon successful completion, munmap( ) shall return 0; otherwise, it shall return .1 and set errno to indicate the error. The munmap( ) function shall fail if: [EINVAL] Addresses in the range [addr,addr+len) are outside the valid range for the address space of a process. The munmap( ) function shall fail if: [EINVAL] The len argument is 0. The munmap( ) function shall fail if: [EINVAL] The addr argument is not a multiple of the page size as returned by sysconf( ).