apmd runs the script, and does nothing until the script is finished. The script runs apm.
apm talks to apmd. apmd is not listening, it is busy waiting for the script to finish. Once you understand the mechanism you'll realize it will never work. <[email protected]> wrote: > My observation is that putting `apm -a` or `apm -b` > into `/etc/apm/powerup` breaks `apm`. > > > My actions, with `-av` for clarity: > > 0. Try `apm -av` to see it works. > > 1. Make `/etc/apm/powerup` like this: > #! /bin/sh > apm -av >> /tmp/apm_powerup 2>&1 > > 2. Check it works: > /bin/sh /etc/apm/powerup > > 3. Follow `/tmp/apm_powerup`, > you should see the output from previous step there: > tail -f /tmp/apm_powerup > > 4. Enact the `/etc/apm/powerup` by (re)starting `apmd` > and look what is running: > rcctl restart apmd && ps auxw | grep apm > You should see `/usr/sbin/apmd` in the output > > 5. Wait awhile > coz `/etc/apm/powerup` doesn't get executed immediately. > Try `ps auxw | grep apm` until you see > `/bin/sh /etc/apm/powerup` & `apm -av` alongside `/usr/sbin/apmd` > > 6. Watch your `tail -f /tmp/apm_powerup` - nothing appears there > > 7. Try `apm -av` from another terminal - it hangs > > 8. `rcctl stop apmd` (or `rcctl restart apmd`) > > 9. I get in both `/tmp/apm_powerup` and hung `apm -av`: > apm: invalid reply from APM daemon: Undefined error: 0 > apm: cannot get reply from APM daemon > > > Expected outcome would be: > Identical output from: > `apm -av` manually, > `/bin/sh /etc/apm/powerup` manually & > `/bin/sh /etc/apm/powerup` automatically > > Actually, > `apm -av` manually & > `/bin/sh /etc/apm/powerup` manually > work fine and give identical output whereas > `/bin/sh /etc/apm/powerup` automatically - hangs. > > Please note that not only `apm -a` or `apm -b` > but also `zzz` & `ZZZ` get broken this way. > > > > Incidentally, I checked quoting: > interactively you do need surrounding quotes like this: > /bin/sh -c '[ "$(apm -av)" = "A/C adapter state: connected" ] && anacron -ds' > whereas in `crontab` you need not surrounding quotes, this is fine: > 30 1 * * * [ "$(apm -av)" = 'A/C adapter state: connected' ] && anacron -ds > and if you do put surrounding quotes in `crontab` like this: > 30 1 * * * '[ "$(apm -av)" = "A/C adapter state: connected" ] && anacron -ds' > the job will not be done. > > So my mistakes were @-strings in `anacrontab` and `PATH` in `crontab`, > both unrelated to the `apm` issue > >
