From owner-freebsd-hackers Fri Oct 27 6:10:11 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from critter.freebsd.dk (flutter.freebsd.dk [212.242.40.147]) by hub.freebsd.org (Postfix) with ESMTP id 39A2837B6C6 for ; Fri, 27 Oct 2000 06:08:36 -0700 (PDT) Received: from critter (localhost [127.0.0.1]) by critter.freebsd.dk (8.11.1/8.9.3) with ESMTP id e9RD8YN10555; Fri, 27 Oct 2000 15:08:34 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) To: Alexander Maret Cc: "'freebsd-hackers@freebsd.org'" Subject: Re: AW: AW: Accessing the tty structure of an opened device In-Reply-To: Your message of "Fri, 27 Oct 2000 15:05:29 +0200." <58A002A02C5ED311812E0050044517F00D2613@erlangen01.atrada.de> Date: Fri, 27 Oct 2000 15:08:34 +0200 Message-ID: <10553.972652114@critter> From: Poul-Henning Kamp Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <58A002A02C5ED311812E0050044517F00D2613@erlangen01.atrada.de>, Alexa nder Maret writes: >> From: Poul-Henning Kamp [mailto:phk@critter.freebsd.dk] >> Subject: Re: AW: Accessing the tty structure of an opened device >> >> >> How fast do these pulses arrive ? Consider using the >> PPS-API for that: >> > >the time between a pulse and a space often only takes >a few milliseconds. I have to meassure that with >gettimeofday(). You will need to do this in a device driver, there is no way you can reliably measure that from userland. Trust me on this: I've tried. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message