Denys Vlasenko schrieb:
> On Friday 02 November 2007 19:59, Marc Blumentritt wrote:
>> Hi bb list,
>>
>> #!/bin/sh
>> # Copyright 2006-2007 Gentoo Foundation
>> # Distributed under the terms of the GNU General Public License v2
>>
>> # Ensure we are called by init
>> echo "PPID = $PPID"
>> #[ "$PPID" == "1" ] || exit 0
>>
>> I would expect a PPID of 1, bit I get something like 833! But if a check
>> with ps, init has PID of 1?! I cannot explain this. I also used sysvinit
>> instead of bb init and checked PPID in a similar way and got the same
>> result! The only idea I have, where this could come from is, that
>> /bin/sh is of course a link to /bin/busybox. Perhaps this breaks
>> checking PPID? Or this is some kind of bug? Or is this related with
>> running a system in rootfs of initramfs?
>
> I think that your process gets started from a child if init, not
> an init itself. Do "ps -A" and send output to the list,
> and alsoo look up what process has PID 833.
This is ps -A from booted system:
[EMAIL PROTECTED] $ ps -A
PID USER COMMAND
1 root init
2 root [kthreadd]
3 root [migration/0]
4 root [ksoftirqd/0]
5 root [events/0]
6 root [khelper]
34 root [kblockd/0]
35 root [kacpid]
36 root [kacpi_notify]
124 root [ksuspend_usbd]
127 root [khubd]
129 root [kseriod]
144 root [pdflush]
145 root [pdflush]
146 root [kswapd0]
147 root [aio/0]
148 root [jfsIO]
149 root [jfsCommit]
150 root [jfsSync]
151 root [xfslogd/0]
152 root [xfsdatad/0]
824 root [kpsmoused]
1222 root syslogd
1352 root /usr/sbin/dropbear
1359 root /sbin/getty 38400 tty1
1360 root /sbin/getty 38400 tty2
1362 root /sbin/getty 38400 tty3
1363 root /sbin/getty 38400 tty4
1364 root /sbin/getty 38400 tty5
1371 root /sbin/getty 38400 tty6
1375 root /usr/sbin/dropbear
1376 root -sh
1381 root ps -A
I do not see PID 833.
I also added
ps -a > /ps_init_data to my init script and got this result(!):
[EMAIL PROTECTED] $ cat /ps_init_data
PID USER COMMAND
Empty list? At least init should be listed, shouldn't it?
I'm also checking the PPID of my shutdown script. It was 1384 , but I
think this depends upon how many commands I executed before (I did the
cat command and reboot). Could it be, that busybox init creates a child
process for every action it does?
Regards,
Marc
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