unlink safe before close?

[Randall Howard]

Of course any SVID/POSIX compliant system where unlink before close
is dangerous is just plain buggy.  However, in the real world, systems
like MS-DOS and OS/2 corrupt the file system or give errors, respectively
in this case.  As a result, and in the interests of maximal portability
it is always a good idea to close files before unlinking.

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