Re: [CFR] reflect resolv.conf update to running application

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 08/21/05

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    To: Alexander Leidinger <Alexander@Leidinger.net>
Date: Sun, 21 Aug 2005 19:17:06 +0200

    In message <20050821115454.55441a64@Magellan.Leidinger.net>, Alexander Leidinger writes:
    >On Sun, 21 Aug 2005 00:37:56 +0100 (BST)
    >Robert Watson <rwatson@freebsd.org> wrote:
    >
    >> (2) By reading the configuration file more frequently and more quickly
    >> after a change, we increase the chances of a race condition in which
    >> the resolve reads a partially written resolv.conf file during an
    >> update. Does this happen in practice? I've always been very leery of
    >> re-reading configuration files automatically based on a time-stamp, as
    >> updates to files are not atomic at all.
    >
    >Can kqueue be used instead of polling?

    Programs writing resolv.conf should just this the right way:

            1. Write new contents to temorary file.
            2. Rename temporary file to resolv.conf. 

    -- 
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.
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