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mmap/munmap with zero length

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From: Alexander Best <alexbestms@...>
To: <freebsd-hackers@...>
Subject: mmap/munmap with zero length
Date: Saturday, July 4, 2009 - 6:48 pm

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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Messages in current thread:
mmap/munmap with zero length, Alexander Best, (Sat Jul 4, 6:48 pm)
Re: mmap/munmap with zero length, Nate Eldredge, (Sat Jul 4, 8:40 pm)
Re: mmap/munmap with zero length, Alexander Best, (Sun Jul 5, 3:32 am)
Re: mmap/munmap with zero length, John Baldwin, (Mon Jul 13, 2:28 pm)
Re: mmap/munmap with zero length, Tijl Coosemans, (Mon Jul 13, 3:33 pm)
Re: mmap/munmap with zero length, John Baldwin, (Mon Jul 13, 4:39 pm)
Re: mmap/munmap with zero length, Mel Flynn, (Mon Jul 20, 2:13 am)
Re: mmap/munmap with zero length, Mel Flynn, (Mon Jul 20, 3:07 am)
Re: mmap/munmap with zero length, Alan Cox, (Tue Jul 14, 12:32 pm)
Re: mmap/munmap with zero length, Paul B. Mahol, (Sat Jul 4, 8:27 pm)
Re: mmap/munmap with zero length, Dag-Erling Smørgrav, (Mon Jul 6, 8:14 am)
Re: mmap/munmap with zero length, Bob Bishop, (Mon Jul 6, 9:05 am)
Re: mmap/munmap with zero length, Alexander Best, (Wed Jul 8, 6:42 pm)
Re: mmap/munmap with zero length, Dag-Erling Smørgrav, (Mon Jul 6, 9:49 am)