Date: Sun, 03 Jan 2010 09:32:15 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Aristedes Maniatis <ari@ish.com.au> Cc: freebsd-current@freebsd.org Subject: Re: [PATCH] Shutdown cooloff feature Message-ID: <4B40641F.2010005@infracaninophile.co.uk> In-Reply-To: <4B405C3D.7090501@ish.com.au> References: <4AC141B0.4090705@delphij.net> <alpine.BSF.2.00.0909291245080.91454@fledge.watson.org> <hhoobp$grh$1@ger.gmane.org> <4B405C3D.7090501@ish.com.au>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig7803A78CB78F80E84589946C Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Aristedes Maniatis wrote: > Why would an operating system have an unclean shutdown command at all? = reboot(8) by default isn't a completely unclean shutdown. It does flush any pending IO to disk and send a SIGTERM to all processes which should=20 stop them relatively cleanly and get you back up again without having to fsck(8) everything. What it doesn't do is run the rc.subr(8) shutdown scripts. A lot of the time, you'ld get away with that. It's only if you've got apps that don't handle SIGTERM correctly, or that take too long shutting down and get zapped by the SIGKILL reboot(8) sends to the laggards. (A big RDBMS for instance) If you want a really unclean shutdown, try 'reboot -q' or 'reboot -n'. 'reboot -qn' is virtually the same as toggling the power off and on again= at the mains. Hmmm... didn't there use to be a note about using 'halt -n= ' "if the processor catches fire" in the reboot(8) man page? Cheers, Matthew --=20 Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW --------------enig7803A78CB78F80E84589946C Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREIAAYFAktAZCYACgkQ8Mjk52CukIx1/QCdGV6EwQvG6sqhx4cYuebCTjN4 89cAn2aZlJu5QUdk4Ddyn8euvDaG0Uxf =ovfU -----END PGP SIGNATURE----- --------------enig7803A78CB78F80E84589946C--
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