Date: Thu, 17 May 2001 18:40:11 -0700 (PDT) From: John Polstra <jdp@polstra.com> To: current@freebsd.org Cc: huntting@glarp.com Subject: Re: catching abrupt time changes Message-ID: <200105180140.f4I1eBZ92306@vashon.polstra.com> In-Reply-To: <200105170722.f4H7MmR27336@hunkular.glarp.com> References: <200105170722.f4H7MmR27336@hunkular.glarp.com>
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In article <200105170722.f4H7MmR27336@hunkular.glarp.com>, Brad Huntting <huntting@glarp.com> wrote: > > Suppose I'm a (root) process: I have an appointment in exactly > one hour. I call select() and specify a timeout of 3600 seconds, > trusting that the system will wake me up just in time. But > unbeknownst to me someone sets the clock back 10 minutes while I'm > asleep (using settimeofday(), not adjtime()). When select() returns > I find that I'm 10 minutes late! > > My question is: > > How can I arrange to be notified when someone and makes a > corse change to the system clock? This may be more work than you want to do, but ... You could add a new kqueue event which is generated when the system time is stepped. Then you could do your sleeping with kevent(). John -- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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