HELPLIB.HLB  —  CRTL  munmap  Return Values
    0                  Indicates success.
    -1                 Indicates an error; errno is set to one of the
                       following values:

                       o  ENIVAL - The addr argument is not a
                          multiple of the page size as returned by
                          sysconf(_SC_PAGE_SIZE).

                       o  EFAULT - The range [addr, addr + len]
                          includes an invalid address.
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