Date: Sun, 27 Sep 2015 01:04:06 -0700 From: Colin Percival <cperciva@freebsd.org> To: Ian Smith <smithi@nimnet.asn.au> Cc: Jung-uk Kim <jkim@FreeBSD.org>, John Baldwin <jhb@FreeBSD.org>, "freebsd-acpi@freebsd.org" <freebsd-acpi@FreeBSD.org>, Dan Lukes <dan@obluda.cz> Subject: Re: disabling sleep when shutting down Message-ID: <5607A2F6.60204@freebsd.org> In-Reply-To: <20150927164605.U29510@sola.nimnet.asn.au> References: <55FA3848.7090802@freebsd.org> <55FB233D.2080000@FreeBSD.org> <55FB48E3.20401@freebsd.org> <55FC4F13.3090603@FreeBSD.org> <55FC57F9.3050702@yahoo.com> <55FE5D54.1030806@freebsd.org> <5601A863.5070406@FreeBSD.org> <560262BF.7090107@freebsd.org> <5602DE8D.3020102@FreeBSD.org> <560648A7.4030708@freebsd.org> <20150927024553.L29510@sola.nimnet.asn.au> <5606EA4A.3090705@freebsd.org> <20150927164605.U29510@sola.nimnet.asn.au>
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On 09/27/15 00:07, Ian Smith wrote: > On Sat, 26 Sep 2015 11:56:10 -0700, Colin Percival wrote: > > Ok, so you're satisfied with having the suspend-disabling triggered by > > init (i.e., not happening until shutdown(8) reaches "now")? > > Sure, if you're satisfied that 'shutdown [..] now' - or hitting the > power button as Dan mentioned - then quickly closing the lid will lose > that race. As you say, with this mechanism in place, accessing it from > shutdown(8) would be straightforward if deemed necessary. So, yes. I'll check before committing, but I'd be very surprised if you could close the lid of a laptop in the window between hitting enter on 'shutdown -p now' and when init sets the sysctl. The code path is very direct... we should be talking a few ms at most. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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