Date: Tue, 14 Jan 2003 02:00:22 -0800 From: Marcel Moolenaar <marcel@xcllnt.net> To: "Alan L. Cox" <alc@imimic.com> Cc: Peter Wemm <peter@wemm.org>, Matthew Dillon <dillon@apollo.backplane.com>, arch@FreeBSD.ORG Subject: Re: Virtual memory question Message-ID: <20030114100022.GA17799@dhcp01.pn.xcllnt.net> In-Reply-To: <3E239150.9FC363DD@imimic.com> References: <20030114041407.DDFC32A89E@canning.wemm.org> <3E239150.9FC363DD@imimic.com>
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On Mon, Jan 13, 2003 at 10:25:52PM -0600, Alan L. Cox wrote:
>
> >From the spec (on the web page that I mentioned):
>
> "The name argument points to a string naming a shared memory object. It
> is unspecified whether the name appears in the file system and is
> visible to other functions that take pathnames as arguments."
>
> I don't think ftruncate() is necessary. The underlying shm object can
> be grown implicitly according to its mmap()ings. I do not, however,
> know of a way to shrink an shm object.
shm_open("key", O_TRUNC|..., ...) ?
--
Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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