Date: Thu, 23 Aug 2001 12:08:01 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Bernd Walter <ticso@mail.cicely.de> Cc: Matt Dillon <dillon@earth.backplane.com>, Alfred Perlstein <bright@mu.org>, freebsd-hackers@FreeBSD.ORG Subject: Re: mmap MAP_INHERIT question. Message-ID: <Pine.BSF.4.21.0108231206130.48732-100000@InterJet.elischer.org> In-Reply-To: <20010823203640.B27427@cicely20.cicely.de>
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On Thu, 23 Aug 2001, Bernd Walter wrote: > On Thu, Aug 23, 2001 at 10:38:31AM -0700, Matt Dillon wrote: > > MAP_INHERIT is broken and always has been. > > That's a good argument. > If it's true it awards an entry in the manpages BUGS section. > Btw. I just tested on NetBSD 1.5U sparc with the same result - > but without the crashing. > > Is there another way to get a shared memory region into another program > without using SYSV SHM and without having a linked file? > The problem is that I don't want a file lying around and need to > be possible to exec at every time. create teh file, unlink it. pass the file descriptor across a unix domain socket? > > I thought about creating a file - unlinking it and dup2 the still open > handle into second programm - then mmap the whole file. > Will the memory be truely shared after that or do I need to msync(2)? > Will it work if I use MAP_NOSYNC? > msync syncs to disk you probably DON't want that.. it'll be shared if you specify that.. > -- > B.Walter COSMO-Project http://www.cosmo-project.de > ticso@cicely.de Usergroup info@cosmo-project.de > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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