Date: Fri, 6 Feb 1998 01:36:59 +0100 From: Eivind Eklund <eivind@yes.no> To: Terry Lambert <tlambert@primenet.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Shared memory and signals Message-ID: <19980206013659.03288@follo.net> In-Reply-To: <199802060031.RAA16316@usr02.primenet.com>; from Terry Lambert on Fri, Feb 06, 1998 at 12:31:51AM %2B0000 References: <19980206012232.55341@follo.net> <199802060031.RAA16316@usr02.primenet.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, Feb 06, 1998 at 12:31:51AM +0000, Terry Lambert wrote: > > > If you use an mmap'ed file instead of a SysV SHM segment, then you > > > will get resource-tracking cleanup after the last close, like you > > > wanted. The file will stick around, but you can unlink it and use > > > UNIX domain sockets to pass the descriptor between processes, if this > > > is a problem. > > > > Any particular reason not to mmap() /dev/zero? I though that was considered > > the way to do this, instead of unlinking. > > You have to pass sockets around instead of everyone just opening > the same file... What I meant was that it would probably be preferable to mmap /dev/zero and pass that descriptor around, instead of creating a file, mmaping it, unlinking it, and pass _that_ descriptor around. Unless there is something I'm really missing here. I've always used fork() to get the descriptor passed easily, anyway :-) Eivind.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19980206013659.03288>