The seekdir() function sets the position of the next readdir(3C)
operation on the directory stream specified by dirp to the position specified by loc. The value of loc should have been returned from
an earlier call to telldir(3C). The new position reverts to the one associated with the
directory stream when telldir() was performed.
If the value of loc was not obtained from an earlier call to telldir() or if a call to rewinddir(3C) occurred between the call to telldir () and the call to seekdir(), the results of subsequent calls to readdir() are unspecified.
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