As ftok uses only the last 16 bits of the inode of the file,
you can get collisions on large filesystems. Unfortunately,
on large filesystems you can get collisions rather quickly:
if you have a collection of 350-400 files, odds are that two
of them have inodes with the same last 16 bits. So I've
taken to using fileinode instead of ftok with functions like
shmop_open.
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