Date: Mon, 29 Oct 2001 10:48:32 -0800 From: "David O'Brien" <obrien@FreeBSD.ORG> To: Terry Lambert <tlambert2@mindspring.com> Cc: Mike Barcroft <mike@FreeBSD.ORG>, void <float@firedrake.org>, Kris Kennaway <kris@obsecurity.org>, hackers@FreeBSD.ORG Subject: Re: syslogd and kqueue Message-ID: <20011029104832.A11707@dragon.nuxi.com> In-Reply-To: <3BDD94FB.B9B87153@mindspring.com>; from tlambert2@mindspring.com on Mon, Oct 29, 2001 at 09:42:19AM -0800 References: <20011026200436.A61058@xor.obsecurity.org> <20011027043342.A18231@parhelion.firedrake.org> <20011027001704.B2586@coffee.q9media.com> <20011027002622.C2586@coffee.q9media.com> <20011028180643.B59388@dragon.nuxi.com> <3BDCCFB2.1E5CFC49@mindspring.com> <20011028202345.A60175@dragon.nuxi.com> <3BDD8557.A2190693@mindspring.com> <20011029093252.A2425@dragon.nuxi.com> <3BDD94FB.B9B87153@mindspring.com>
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On Mon, Oct 29, 2001 at 09:42:19AM -0800, Terry Lambert wrote: > David O'Brien wrote: > > > > On Mon, Oct 29, 2001 at 08:35:35AM -0800, Terry Lambert wrote: > > > > No muss, no fuss. So where is the race? > > > > Mike had the only justification so far -- that of permissions of the > > > > file. > > > > > > Think multiple instances of syslogd. > > > > You are going to have to help me out a little bit more -- I can think of > > no problems with what I proposed vs. the existing way. Both have a race > > of which daemon opens the file first. > > Not if you don't use O_CREAT; then they don't. Why not? If the file exists and I start up two syslogd's, there is a race of which one open's the file first. If I start up two syslogd's and the file does not exist and then I touch the file. There will be a race if I ``kill -HUP <pid #1> <pid #2>''. If I take care to HUP only one syslogd, move the file to the side, touch the file again and HUP the second syslogd there is no race. I can similarly take this amount of care with the way I would like syslogd to work such that there is no race. -- -- David (obrien@FreeBSD.org) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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