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www.nico.schottelius.org/software/cinit/browse_source/cinit-0.3pre3/TODO
Nico Schottelius 423ba10303 import cinit from unix.schottelius.org 
Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>
2009-09-16 12:53:45 +02:00

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- define how it should work (doc/braindums/big-picture.text)
- define service status in one document, so repeatition stops!
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- rename headers/ -> includes/
- remove client/ from top level
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- write about shell scripts in system startup
- write about general behaviour (covering the death)
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Generate automatic asciidoc from conf/*
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Add handler for ctrl+alt+delete
* document in paths
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pre-compile config: conf/*
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panic:
read configuratio from defaults/panic*
-> write execute_something before!
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comm:
tmpnow: search for pid in list,
save the pid in the list, so we know whether our executer died!
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Logging / cinit:
fuer unsere eigenen ausgaben auch multilog?
Logger: shared memory?
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Implement full starting logic in server?
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Build full dependency tree at start? And begin from the end?
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comm/*:
int read
int write
--> fuer pipes
run_init_svc
muss alle services wissen, die gestartet werden
start_services_with_deps
gibt pointer auf struktur zurueck
-> Anzahl Services (array!)
-> Service:
Name (Pfad)
Ergebniss
-> beim fehler, die nachricht, strerror?
http://www.opengroup.org/onlinepubs/009695399/functions/strerror.html
Beim starten werden needs und wants als needs behandelt, weil
jeder starter _alle_ services zurueckgeben muss.
Ein Prozess kann maximal 512 abhaengigkeiten haben.
-> open files
Neues cinit:
Wenn service fehlschlaegt, wird eine Struktur zurueckgegeben.
Diese enhaelt:
int success =
enum { SVC_SUCCESS, SVC_FAILED, SVC_NEED_FAILED, ... }
char *reason;
Ausgaben nach Beendigung vom Starten des Services.
[ on ] %s + Ergebnis
[ off ] %s
Rekursives herunter/rauffahren
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- add error handling to cinit.install.binary
- remove sigio(), create new functions:
- one for cleaning up the socket
- one for doing the communication (specify two fd's)
- put some logic around exec_svc:
o put waiting code herein -> waiting code to structure!
- cleanup serv/sig_reboot.c:7:
o implement os-specific reboot function
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1. Entfernung mount
2. kommunikation ueber
1. einen fork pro service
fork(fork)
3. Socket wird erst nach einem Signal erstellt
-> Konfiguration sollte SIGWHATEVER senden
4. Vielleicht panicen, wenn init fehlschlaegt?
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Als naechstes:
- add code do implement stopping / restarting with dependency tree
o add used_by to the list of services
o used_by should be a simple (double?) linked list
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Documentation:
- Installing cinit
o compiling cinit from source
o debian / gentoo
- Configuring
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Add "used" by to each service, so we can track which services to shutdown.
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- perhaps use dnotify?
- recheck warm reboot
- fix cservice
- print service name or cinit: before _everything_ WE print
TESTING:
- does cinit eat zombies?
- is the reporting ok?
- does cservice and ccontrol what's expected?
# cinit.create.empty.service: can only be started from the bin directory
- compile cinit static and other tools dynamically per default
- Fix Switching services off !!
- Remove RUN_RUN_SVCs, move code to run_svc so one can determine which
services failed?
--> sequentieller ablauf!
--> parallel ablauf, struct-array mit namen und ergebnis?
--> for dep in deps/*; do fork(run_svc() ); done
-----> while(any_is_running) { sleep }
-------> array durchsuchen, ergebnis nutzen.
- ueberpruefen von wo aus run_svc() aufgerufen wird
- Fix SIGCHILD problem:
- exec_svc wants to waitpid() itself, so SIG_CHILD makes problems
- respawn_svc: does that need to act on SIGCHLD if the master process
is still running?
- kill respawn -> sigchild cleans up, we do not get waitpid perhaps?
- remove umount code?
- remove zombies, but keep away from SIGCHILD problems
- remove mount /etc/cinit/tmp code
-> how to replace?
- fix bug in Makefile: linking happens twice
- do not kill respawing service, if off exists
- ccontrol
- manpages
- Error codes when shutting down a service?
- Delay dokumentieren
- no_kill dokumentieren
- ddoc zuendefuehren
- remove umount, swapoff?
--> to services?
- on.out, on.err, on.in?
-> reading/writing from/to files
--> Wenn kein ReSPAWN und der Prozess beendet sich nicht,
dann haengt init!
- implement "no_kill" until cinit-0.2 or 0.3?
Doku!!!
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- Source Logic issues
- remove FIXME entries (and what should be fixed, too)
- memset for timespecs?
- move umount, swapoff and remount to off of init?
-> cleanup sig_reboot.c
- run_svc:
o we have many strcat()s, perhaps save length of pathbuf and strncat at
pathtmp[strlen(pathbuf)] ?
- do we really need swapoff?
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- Documentation
- Write manpages (use doc/* as base for that)
- Check Spell and Grammar in documentation
- write howto:
o Howto-cinit
o Howto-cinit-uml
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Things I did not do and I don't know whether we have to care about:
- Porting
- add porting code to other unices?
- like openssh guys do?
- close(*>2) before forking / executing
-> close fds, clean environment, etc., ...
-> do we really need that?
- logging service!
-> write output $somewhere, wait for syslog?
-> flush at the end of start-process?
-> perhaps pipe logging output to a program?
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[OLD BUGS]
- remove cinit watcher?
-> sig_child -> cycle through list?
- DOKU: what happens when a service does not terminate....
und er als once drin ist
- MANPAGE!
- execve() fails -> no sleep!!
- multiple zombies sometimes - problemservices
-> zombies of respawn watchers are not caught!
-> sig_chld also therein
-> problematic due to wait for child
-doubled cinit instance
- nur einmal
- free() everything before starting child
- cservice!
- prozess nur einmal -> WARTET! cinit auch!
doku:
cservice einmal starten -> wartet auf ende
cint ersetzt init bei gentoo
an error occuerd-> verbose
multuicall probleme -> busysbox --> GIBT ES NICHT!!
---> DOKU DAZU! mit links, doppelt links, aus test
---> erklaeren, dass es unproblematisch ist!
11:09 < folken23> telmich: zsb. eine grund angabe warum ein dienst nicht gestartet
werden konnte.
11:09 < folken23> telmich: e.g. file nicht gefunden, service hat nicht 0
zurueckgeworfen.
11:09 < folken23> telmich: oder service allready started.
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possible BUGS:
[14:44] freelsd:cinit-0.2.2% ./sbin/cservice -e ein
ein: No such file or directory
Bad address
: Service does not exist
cinit-0.2.2:
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 96.7 0.0 1580 336 ? R 18:59 5:49 /sbin/cinit
root 2 0.0 0.0 0 0 ? SN 18:59 0:00 [ksoftirqd/0]
root 3 0.0 0.0 0 0 ? S 18:59 0:00 [watchdog/0]
root 4 0.0 0.0 0 0 ? S< 18:59 0:00 [events/0]
root 5 0.0 0.0 0 0 ? S< 18:59 0:00 [khelper]
root 6 0.0 0.0 0 0 ? S< 18:59 0:00 [kthread]
root 10 0.0 0.0 0 0 ? S< 18:59 0:00 \_ [khubd]
root 12 0.0 0.0 0 0 ? S< 18:59 0:00 \_ [kblockd/0]
root 99 0.0 0.0 0 0 ? S 18:59 0:00 \_ [pdflush]
root 100 0.0 0.0 0 0 ? S 18:59 0:00 \_ [pdflush]
root 102 0.0 0.0 0 0 ? S< 18:59 0:00 \_ [aio/0]
root 727 0.0 0.0 0 0 ? S< 18:59 0:00 \_ [kseriod]
root 101 0.0 0.0 0 0 ? S 18:59 0:00 [kswapd0]
root 800 0.0 0.0 0 0 ? S 18:59 0:00 [khpsbpkt]
root 803 0.0 0.0 0 0 ? S 18:59 0:00 [pccardd]
root 838 0.0 0.0 0 0 ? S 18:59 0:00 [kjournald]
root 1923 0.0 0.0 1584 200 ? S 18:59 0:00 /sbin/cinit
root 1924 0.0 0.3 3624 1936 tty2 Rs 18:59 0:00 \_ -zsh
root 1969 0.0 0.0 1580 320 tty2 S 19:05 0:00 \_ cservice -e 3
root 1972 0.0 0.1 2604 828 tty2 R+ 19:05 0:00 \_ ps axuwwf
root 1945 0.0 0.0 0 0 tty2 Z 19:01 0:00 [loadkeys] <defunct>
cinit: [cprofile:profile]
cinit should not be started directly, but by your kernel.
umount raus
/etc/cinit/specials/... rein
1. Doku auf asciidoc umstellen
2. den signalhandler code fixen
3. den tempmount entfernen
--> cinit-0.3-rc1
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Optimisations
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tree_exec
~~~~~~~~~
- only check dependencies (=needs) after the basic run?
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