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Full Discussion: init and process control
Top Forums UNIX for Dummies Questions & Answers init and process control Post 302099927 by dexfantasy on Thursday 14th of December 2006 06:54:40 PM
Old 12-14-2006
init and process control

I'm trying to wrap my head around process control in Unix... particularly init and how it fits in to the equation. Init is responsible for creating sessions by spawning instances of getty which calls login effectively creating sessions right? Why then can init belong to a session? If you ps jx 1, you will see init belongs to SID 1. Is SID 1 a pseudo session or just a bogus number added as a formality to the output of ps? I notice that a lot of other low level user processes belong to this special session. Could someone explain to me a little more about it? I've been googling all over the place today for a clearer understanding.

Thanks.

Dex
 

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runit-init(8)						      System Manager's Manual						     runit-init(8)

NAME
init - a UNIX process no 1 SYNOPSIS
init [ 0 | 6 ] DESCRIPTION
runit-init is the first process the kernel starts. If runit-init is started as process no 1, it runs and replaces itself with runit(8). If runit-init is started while the system is up, it must be either called as init 0 or init 6: init 0 tells the Unix process no 1 to shutdown and halt the system. To signal runit(8) the system halt request, runit-init removes all permissions of the file /etc/runit/reboot (chmod 0), and sets the execute by owner permission of the file /etc/runit/stopit (chmod 100). Then a CONT signal is sent to runit(8). init 6 tells the Unix process no 1 to shutdown and reboot the system. To signal runit(8) the system reboot request, runit-init sets the execute by owner permission of the files /etc/runit/reboot and /etc/runit/stopit (chmod 100). Then a CONT signal is sent to runit(8). EXIT CODES
runit-init returns 111 on error, 0 in all other cases. SEE ALSO
runit(8), runsvdir(8), runsvchdir(8), sv(8), runsv(8), chpst(8), utmpset(8), svlogd(8) http://smarden.org/runit/ AUTHOR
Gerrit Pape <pape@smarden.org> runit-init(8)
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