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unlink EPERM vs EISDIR

From: Roland McGrath
Subject: unlink EPERM vs EISDIR
Date: Sun, 26 May 2002 15:27:05 -0400 (EDT)

I've just become aware that unlink on a directory is required by POSIX to
fail with EPERM, while our code (diskfs) and (so I am told) Linux returns
EISDIR.  I looked at FreeBSD 4.3 and NetBSD 1.5, and those use EPERM.  
If there are no objections, I will change diskfs to return EPERM.

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