any reason you cant just use the pwr_butt input and use the apci driver ?
On 6/2/2016 3:28 PM, YP66 wrote:
> I am working on an automatic shutdown based on an external signal
> (through a digital IO line), on a BB black, running Debian Jessie.
>
> I build a program that monitors the digital line and when that line
> goes high, the program calls
> system("/sbin/shutdown -h now");
>
> When I run that program interactively, it takes anywhere between 6 to
> 10 seconds to shutdown following the digital line flip. I use an LED
> to tell me when the process detects the bit flip so I can reliably
> count the time to shutdown. The actual shutdown is evident because
> all the lights go off. At that point I have to recycle power to start
> again, which is exactly what I want.
>
> However, when I put the same program to run as a service (by adding a
> service in /lib/systemd/ and using systemctl to start it), the system
> takes over 30 seconds to shutdown, sometimes a minute or two. I know
> the program is running as a service because I can see the LED I am
> using as feedback. The LED changes blink rate when the 'service'
> detects the GPIO change so I can tell the program is getting to the
> point of making the system call, it just takes so much longer. In
> fact, initially I thought it did not work, only to have the system
> shutdown on my suddenly a couple of minutes later.
>
> So the situation is that a program running directly goes through a
> shutdown almost instantaneously but when run through a service, it
> takes significantly longer. Any idea why?
>
> By the way, I have also tried
>
> sync();
> reboot(LINUX_REBOOT_CMD_POWER_OFF);
>
> instad of system("/sbin/shutdown -h now'), and I get more or less the
> same behavior.
>
>
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