remove a mapping
munmap() system call deletes the mappings for the
specified address range, and causes further references to addresses within the
range to generate invalid memory references.
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable
errno is set to indicate the error.
munmap() will fail if:
When len is non-zero, the
- The addr and len parameters
specify a region that would extend beyond the end of the address space, or
some part of the region being unmapped is not part of the currently valid
function conforms to IEEE Std 1003.1-2008
munmap() system call first appeared in
IEEE Std 1003.1-2008 (“POSIX.1”) specifies
munmap() shall fail with
EINVAL if len is 0.
OpenBSD performs no action in this case.