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From: John Baldwin <jhb@freebsd.org>
To: freebsd-acpi@freebsd.org
Subject: Re: How to know the system state if the system is going for halt or
 poweroff or reboot in FreeBSD
Date: Mon, 06 Apr 2015 14:35:30 -0400
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 (bigwig.baldwin.cx); Mon, 06 Apr 2015 15:19:25 -0400 (EDT)
Cc: freebsd-bugs@freebsd.org, Sibananda Sahu <sibananda.sahu@avagotech.com>
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On Thursday, March 26, 2015 01:54:45 AM Sibananda Sahu wrote:
> My requirement is to know the exact reason of shutdown, whether is it=
 a
> power-off or a reboot call.
>=20
> And I can get the information from the =E2=80=9Chowto=E2=80=9D variab=
le that is passed to
> the kern_reboot() function call, but this variable is local to
> kern_reboot() only.

It is passed to the shutdown_* eventhandlers.  So if you register an ev=
enthandler
you can get the howto argument that way.  ACPI uses this to power off t=
he machine
for a power off request for example:

static void
acpi_shutdown_final(void *arg, int howto)
{
    ...
    if ((howto & RB_POWEROFF) !=3D 0) {
=09status =3D AcpiEnterSleepStatePrep(ACPI_STATE_S5);
}


--=20
John Baldwin