Date: Mon, 16 May 2005 19:02:30 +0200 From: Fredrik Lindberg <fli+freebsd-current@shapeshifter.se> To: freebsd-current@freebsd.org Subject: Patch to make powerd(8) devd(8)-aware Message-ID: <20050516170230.GB90847@shapeshifter.se>
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Hi I wrote a small patch to make powerd(8) aware of devd(8), thus making the AC line state change event driven. Instead of one sysctl call per iteration it just requires reading one variable to determine the AC line state. This should yield faster execution, and hence, lower power consumption. Events are read from /var/run/devd.pipe, therefore requires devd to be running. If devd is not running it will use the old polling method to determinate AC state. devd was choosen over devctl(4) because the current implementation of devctl only allow one reader and that's usually devd(8). Patch avaiable at, apply with patch < -p0 in usr.sbin http://shapeshifter.se/~fli/freebsd/powerd-devd.patch During the same time I also discovered a bug(?) in devd which causes it to terminate with a broken pipe if a client reading /var/run/devd.pipe disappears. Blocking SIGPIPE fixes this. Patch at http://shapeshifter.se/~fli/freebsd/devd.cc-sigpipe.patch You'll need the devd patch if you want to run the devd patch without problems. Fredrik Lindberg
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