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If shmaddr is 0, the system tries to find an unmapped
region in the range 1 - 1.5G starting from the upper value
and coming down from there.
If you specify the exact same virtual address in both of your processes
and those addresses are free, shmat will present the segments at the
same address. If shmaddr is 0, the system will pick one for you and it
might pick differently in different processes.