Date: Sun, 05 Jul 2009 00:48:45 +0200 (CEST) From: Alexander Best <alexbestms@math.uni-muenster.de> To: <freebsd-hackers@FreeBSD.org> Subject: mmap/munmap with zero length Message-ID: <permail-20090704224845f0889e84000046f1-a_best01@message-id.uni-muenster.de>
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i'm wondering why mmap and munmap behave differently when it comes to a length argument of zero. allocating memory with mmap for a zero length file returns a valid pointer to the mapped region. munmap however isn't able to remove a mapping with no length. wouldn't it be better to either forbid this in mmap or to allow it in munmap? cheers. alex
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