Date: Mon, 06 Apr 2015 14:35:30 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-acpi@freebsd.org Cc: freebsd-bugs@freebsd.org Subject: Re: How to know the system state if the system is going for halt or poweroff or reboot in FreeBSD Message-ID: <3069256.iCnUzzNb56@ralph.baldwin.cx> In-Reply-To: <cbf5dcad395190fc8f9716bbc68b4ec1@mail.gmail.com> References: <cbf5dcad395190fc8f9716bbc68b4ec1@mail.gmail.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
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