01-20-2008
Thanks so much for the reply Jnike. I indeed found out the last user who login and then switch to root . But in the end it was all thanks to a Tape Librarian who gave a Hard Reboot to the machine...I cant find out any log for this in /var/adm/messages .
Thanks for the help !!
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REBOOT(2) System Calls Manual REBOOT(2)
NAME
reboot - reboot system or halt processor
SYNOPSIS
#include <sys/reboot.h>
reboot(howto)
int howto;
DESCRIPTION
Reboot reboots the system, and is invoked automatically in the event of unrecoverable system failures. Howto is a mask of options passed
to the bootstrap program. The system call interface permits only RB_HALT or RB_AUTOBOOT to be passed to the reboot program; the other
flags are used in scripts stored on the console storage media, or used in manual bootstrap procedures. When none of these options (e.g.
RB_AUTOBOOT) is given, the system is rebooted from file "vmunix" in the root file system of unit 0 of a disk chosen in a processor specific
way. An automatic consistency check of the disks is then normally performed.
The bits of howto are:
RB_HALT
the processor is simply halted; no reboot takes place. RB_HALT should be used with caution.
RB_ASKNAME
Interpreted by the bootstrap program itself, causing it to inquire as to what file should be booted. Normally, the system is booted
from the file "xx(0,0)vmunix" without asking.
RB_SINGLE
Normally, the reboot procedure involves an automatic disk consistency check and then multi-user operations. RB_SINGLE prevents the
consistency check, rather simply booting the system with a single-user shell on the console. RB_SINGLE is interpreted by the
init(8) program in the newly booted system. This switch is not available from the system call interface.
Only the super-user may reboot a machine.
RETURN VALUES
If successful, this call never returns. Otherwise, a -1 is returned and an error is returned in the global variable errno.
ERRORS
[EPERM] The caller is not the super-user.
SEE ALSO
crash(8), halt(8), init(8), reboot(8)
BUGS
The notion of ``console medium'', among other things, is specific to the VAX.
4th Berkeley Distribution May 9, 1985 REBOOT(2)