Re: sysctl_proc calls handler twice

m.ehinger_at_ltur.de
Date: 08/16/05

  • Next message: Pawel Jakub Dawidek: "Re: sysctl_proc calls handler twice" 
    To: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
Date: Tue, 16 Aug 2005 16:19:26 +0200

    Thanks for all answers,

    that more details than i needed.

    I got around the problem by checking an external variable.

    Here comes the hole story if somebody cares. (but be warned my english isn't the best)

          I wrote an driver for the Accelerometers used in Thinkpad and just want to see the data returned.
          So i created an sysctl proc which will read the data and return it.
          The problem was that the two calls to the proc are to close, i forgot to check if the Accelerometer
          has already finished its last run. So i want to write to the Accelerometer although he wasn't ready for that.
          With sysctlbyname i got no errors because the program itself took enough time between the calls.
          I now check if the previous command has finished before i send the new one so the double call isn't
           a probleme anymore.
          Any questions?

    thanks again for the answers

    maik

                                                                                                                                        
                 "Poul-Henning Kamp" <phk@phk.freebsd.dk>
                 Gesendet von: phk@phk.freebsd.dk
                                                                                                                                     An
                                                                   Bruce Evans <bde@zeta.org.au>
                 16.08.2005 15:35 Kopie
                                                                   m.ehinger@ltur.de, Pawel Jakub Dawidek <pjd@FreeBSD.org>,
                                                                   freebsd-arch@FreeBSD.org
                                                                                                                                  Thema
                                                                   Re: sysctl_proc calls handler twice
                                                                                                                                        
                                                                                                                                        
                                                                                                                                        
                                                                                                                                        
                                                                                                                                        
                                                                                                                                        

    In message <20050816221033.C47830@delplex.bde.org>, Bruce Evans writes:

    > Only the last 2 of these calls reach the handler. Proc handlers are
    > only special here in that they are more specialized than the integer
    > handlers.

    Strictly speaking it is the other way arond: since integer handlers
    are implemented in terms of proc handlers, it follows that proc handlers
    cannot be more specialized than integer handlers. 

    --
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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