Re: how to write get_block?

Manfred Spraul (manfreds@colorfullife.com)
Fri, 08 Oct 1999 20:21:26 +0200

Manfred Spraul wrote:
> I'll check the POSIX standard, perhaps we can just reject mmap() or
> file-locks in this situation.

I couldn't find it in the POSIX standart, but at least some UNIXes don't
allow it:

http://hoth.stsci.edu/man/man2/fcntl.html: (sun unix)
> The fcntl() function will fail if: [...]
> or the cmd argument is F_SETLK, F_SETLK64, F_SETLKW, or F_SETLKW64,
> mandatory file/record locking is set, and the file is currently
> being mapped to virtual memory using mmap(2).

http://cando.dwr.co.gov/cgi-bin/man2html/fcntl(2): IRIX 5.2
> [EAGAIN] cmd is F_SETLK or F_SETLKW , mandatory file locking bit is
> set for the file, and the file is currently being mapped
> to virtual memory via mmap [see mmap(2)].

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