Such a filter would have to use stat() to determine if an entry is a diretory before opening it. The problem is that an entry might change from a directory to a symbolic link between the stat() and the open(). O_NOFOLLOW prevents such race conditions.

In reply to Re^2: readdir() on a sysopen() handle? by perlhuhn
in thread readdir() on a sysopen() handle? by perlhuhn

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