115 lines
2.7 KiB
Text
115 lines
2.7 KiB
Text
cinit 0.4 - Redesign of cinit
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============================================
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Nico Schottelius <nico-linux-cinit__@__schottelius.org>
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0.4.0, for cinit 0.4, Initial Version from 2006-03-11
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:Author Initials: NS
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cinit 0.2 ran fine and the general project of developing a
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parallel executing init system is finished.
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With cinit 0.4 there are new aims to reach.
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Introduction
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------------
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. AIMS
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- portability: no Linux-dependency anymore
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- cleaner signal handling
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- better documentation so more people can use it
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Current problems
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----------------
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Temporary filesystem and socket problematic
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The mount(2) system call is os-specific.
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The temporary fs is os-specific.
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Signal handlers are not clean
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Race conditions when multiple signals arrive
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Reboot code is os specific
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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serv/sig_reboot.c contains umount, remount hard coded.
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Solutions
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---------
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Temporary filesystem and socket problematic
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Remove
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- the mount call
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- do not create an initial socket
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Wait until we recieve a signal, then we create a socket
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under the configured socket directory (see `conf/sockdir`).
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Signal handlers are not clean
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Reboot code is os specific
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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Misc
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~~~~
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- Configuration
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/etc/cinit/config/
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init -> link to initial service
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pre_boot
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pre_boot_args
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post_boot
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post_boot_args
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/etc/cinit/services/
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/etc/cinit/profiles/
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links to the starting services
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cinit - Internals
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=================
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Nico Schottelius <nico-cinit__@__schottelius.org>
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0.1 for cinit-0.3, Initial version: So Feb 19 10:25:46 CET 2006
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:Author Initials: NS
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Introduction
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------------
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This document describes the internals of cinit. It is thought
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to be read by developers.
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Child handler code in cinit-0.3
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-------------------------------
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In cinit versions <= cinit-0.2.1 the respawning services where
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handled by an extra child handler, which was a fork of cinit. This
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had some problems:
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- We allocated more memory than necessary, unecessary parts of
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cinit were copied
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- The SIG_CHILD-handler was not written very clean, in some versions
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it was completly missing.
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. So in `cinit-0.3` we changed it the following way:
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- no extra child handlers
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- handle everything in the SIG_CHILD handling function
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- when sig_child is recieved do:
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- check against respawn list
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- if it is a respawning service, [do the following in a seperate fork?]
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check whether it successfully stoped
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- if yes: restart immediatly
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- if no: sleep $sleep_time and then restart
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