News Group Posts

what shutdown or rebooted the

system?

From: Bela Lubkin <belal@sco.com>
Subject: Re: Uncommanded Reboot - something fishy?
Date: Mon, 2 Dec 2002 20:24:15 GMT
References: <2113452.1038837388@dbforums.com>
<asg92g$2qe$1@pcls4.std.com> 

Tony Lawrence wrote:

> If you think some process is doing this (as opposed to a hardware 
> reboot) see "How do I find out who or what halted my system?" at
> http://aplawrence.com/SCOFAQ/scotec1.html#haltcatch
> 
> (appended here for your convenience)
> 
> First, look in crontab for a call to haltsys or init. Someone may have 
> added this for silly reasons.
> 
> If you think some privileged user or process has run /etc/haltsys, add 
> these lines to it right after the PATH= line
> 
>   {
>   echo $0 `tty` `id`
>   MYPROC=$$
>   NEXTPROC=$MYPROC
>   while [ $NEXTPROC != 0 ]
>   do
>   ps -lp $NEXTPROC
>   MYPROC=$NEXTPROC
>   NEXTPROC=`ps -p $MYPROC -o "ppid=" `
>   done
>   } | mail -s "haltsys was run" root

Change this to:

    } | mail -s "$0 $@ was run" root
    sync
    sleep 5
    sync

The sync and pause routine is necessary because mail delivery can take a
while (especially if you've installed spamassassin ;-), you don't want
to fire off mail when you know the very next thing you're doing is
shutting down.

> This will give you a full trace of where it was called from. You can use 
> a similar technique with /etc/shutdown.

This is true enough, but misses /etc/reboot as well as /etc/uadmin.

_All_ of the SCO-provided shutdown techniques (init [056], shutdown,
haltsys, reboot) eventually funnel through /etc/uadmin.  So the best way
to do this is to move /etc/uadmin to /etc/uadmin.real and use the above
script bit as /etc/uadmin, ending it with:

  exec /etc/uadmin.real "$@"

The `ps` chain is cute, but unnecessary -- better to give `ps -elf`
output and let the reader figure out the chaining.  The actual cause of
shutdown might not be in the parenthood of the process doing the
shutdown.  (e.g. if someone ran `sd shutdown`.)  So the entire script
can be reduced to:

  #!/bin/sh
  {
    echo Process $$, on tty `tty`, user `id`, ran:
    echo "  $0 $@"
    echo
    ps -elf
  } | mail -s "uadmin was run" root
  sync; sleep 5; sync
  exec /etc/uadmin.real "$@" # "real" /etc/uadmin was renamed /etc/uadmin.real

>Bela<
 

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