Date: Tue, 23 Dec 2008 01:20:37 +0000 From: "Jacky Oh" <assaulter0x80@gmail.com> To: "Gerry Weaver" <gerryw@compvia.com> Cc: freebsd-hackers@freebsd.org Subject: Re: How to access kernel memory from user space Message-ID: <ed8027db0812221720u4e9398f0i1b7a829c9acc9249@mail.gmail.com> In-Reply-To: <20081223000534.f740ca8a@mail01.compvia.com> References: <20081223000534.f740ca8a@mail01.compvia.com>
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hi Gerry.. you may be interested in the following functions: int copyin(const void *uaddr, void *kaddr, size_t len); int copyout(const void *kaddr, void *uaddr, size_t len); int copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done); int bcopy(const void *src, const void *dst, len); this functions are using for syscalls related work, among other things..lucky!! Jacky Ohwers 2008/12/23 Gerry Weaver <gerryw@compvia.com> > Hello All, > > I am working on a driver that collects various network statistics via pfil. > I have a simple array of structures that I use to store the statistics. I > also have a user space process that needs to collect these statistics every > second or so. A copy operation from kernel to user space would be too > expensive. Is there a mechanism that would allow me to gain direct access to > my kernel array from user space? The user process would only need read > access. It seems like maybe this could be done with mmap, but since this is > not a character driver, there is no device file etc.. I'm a newbie, so I > apologize if this is something that should be obvious. > > > Thanks in advance, > Gerry > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >
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