File: readlink3

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!ln -s a b
ls -l b
#lrwxr.xr.x +\? +\d+ +\d+ +\d+ +[a-zA-Z]+ +\d+ +\d+:\d\d b -> a
readlink b
#a
!mkdir noreadperm
!ln -s ../a noreadperm/b
!chmod 000 noreadperm
readlink noreadperm/b
#.*permission denied.*
!ln -s afairlylonglinkbutwerestillgoingtohavetomakethebufferartificiallysmall t
readlink t
#afairlylonglinkbutwerestillgoingtohavetomakethebufferartificiallysmall
readlink ""
#.*operation failed