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

From: Sergey Babkin (babkin_at_verizon.net)
Date: 08/23/05

  • Next message: John-Mark Gurney: "Re: New library: libpidfile." 
    Date: Tue, 23 Aug 2005 11:56:37 -0500 (CDT)
To: Dan Nelson <dnelson@allantgroup.com>, Peter Jeremy <PeterJeremy@optushome.com.au>

    >In the last episode (Aug 23), Peter Jeremy said:
    >> On Mon, 2005-Aug-22 13:18:46 -0700, Matthew Reimer wrote:
    >> >How about just stat'ing resolv.conf if more than X seconds has
    >> >passed since the last stat, rather than for every lookup?
    >>
    >> That reduces the number of stat() calls but doesn't resolve the
    >> possibility of reading a half-written resolv.conf.
    >
    >Easy enough to only reread the file if stat tells you it's more than 2
    >seconds old.

    Won't reliably help: the file might change after you've done stat. The real solution would be to :

    * do stat, see that the file has changed
    * read the file into an intermediate buffer
    * wait 1 or 2 seconds
    * do stat again, if the time has not
    changed since the first stat then the
    contents of your buffer is valid and
    yu can use it

    -SB
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  • Next message: John-Mark Gurney: "Re: New library: libpidfile."

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