| gabriel rosenkoetter on Mon, 7 Jul 2003 12:50:16 -0400 |
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On Sun, Jul 06, 2003 at 07:10:25PM -0400, kaze wrote: > That stuff I got, its the mechanics of > > # ln -s /etc/init.d/openlid.sh /etc/rc6.d/S01openlid.sh > > that impress me, I know it has something to do with kernel ring(?) run > levels, I've never heard "ring" used in there... rc stands (I think?) for run control, btw. The principle, under SysV-style init scripts[1] is that you use init(8) to switch run levels, and that anything in /etc/rcN.d is executed at run level N. Scripts that are listed as SXXname are passed a "start" argument, scripts list as KXXname a "stop" argument. The XX governs order within starting and stopping. The ordering of two scripts at a given number-level is, to my knowledge, undefined (that is, don't rely on alphabetization if you want to be portable). Under real SysV Unix, run level 0 is a full system halt (to the boot PROM prompt, typically), 1 is single user, 2 is mult-user, 3 is graphical multi-user, 4 and 5 aren't really used by the OS but may be by some application-specific or localized setup, and 6 means reboot. Linux modifies this a bit, using all of 2-4 as pretty much the same thing and 5 as graphical login. Don't ask me why. From what I've read of various Linux vendor mailing lists, *they're* not even sure why they don't just do it the SysV way. [1] "init scripts" just means scripts run by init(8). -- gabriel rosenkoetter gr@eclipsed.net Attachment:
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