11-13-2001
urgent help..needed..
Hi.....
I try to increase the /usr and /var file system size i move to init s that is the single user mode and tried it but it is giving error /usr busy..not able to unmount..then i tried to reboot and go to ISL prompt but when i am interrupting the boot process....it is giving error..
IPL error bad LIF magic
A: ack read of this entry
x:- disable all future alert message antything else skip redisplaying the log entry
:->choice
aftre that if i am pressing any key 2to 3 times it is going back to the main menu............
now my problem is how to go to ISL prompt
please help..
praful
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INIT(8) System Manager's Manual INIT(8)
NAME
init - process control initialization
SYNOPSIS
/etc/init
DESCRIPTION
Init is invoked inside UNIX as the last step in the boot procedure. It normally then runs the automatic reboot sequence as described in
reboot(8), and if this succeeds, begins multi-user operation. If the reboot fails, it commences single user operation by giving the super-
user a shell on the console. It is possible to pass parameters from the boot program to init so that single user operation is commenced
immediately. When such single user operation is terminated by killing the single-user shell (i.e. by hitting ^D), init runs /etc/rc with-
out the reboot parameter. This command file performs housekeeping operations such as removing temporary files, mounting file systems, and
starting daemons.
In multi-user operation, init's role is to create a process for each terminal port on which a user may log in. To begin such operations,
it reads the file /etc/ttys and executes a command for each terminal specified in the file. This command will usually be
/usr/libexec/getty. Getty opens and initializes the terminal line, reads the user's name and invokes login to log in the user and execute
the Shell.
Ultimately the Shell will terminate because of an end-of-file either typed explicitly or generated as a result of hanging up. The main
path of init, which has been waiting for such an event, wakes up and removes the appropriate entry from the file utmp, which records cur-
rent users, and makes an entry in the wtmp, file which maintains a history of logins and logouts. The wtmp entry is made only if a user
logged in successfully on the line. Then the appropriate terminal is reopened and getty is reinvoked.
Init catches the hangup signal (signal SIGHUP) and interprets it to mean that the file /etc/ttys should be read again. The Shell process
on each line which used to be active in ttys but is no longer there is terminated; a new process is created for each added line; lines
unchanged in the file are undisturbed. Thus it is possible to drop or add terminal lines without rebooting the system by changing the ttys
file and sending a hangup signal to the init process: use `kill -HUP 1.'
Init will terminate multi-user operations and resume single-user mode if sent a terminate (TERM) signal, i.e. ``kill -TERM 1''. If there
are processes outstanding which are deadlocked (due to hardware or software failure), init will not wait for them all to die (which might
take forever), but will time out after 30 seconds and print a warning message.
Init will cease creating new getty's and allow the system to slowly die away, if it is sent a terminal stop (TSTP) signal, i.e. ``kill
-TSTP 1''. A later hangup will resume full multi-user operations, or a terminate will initiate a single user shell. This hook is used by
reboot(8) and halt(8).
Init's role is so critical that if it dies, the system will reboot itself automatically. If, at bootstrap time, the init process cannot be
located, the system will loop in user mode at location 0x13.
DIAGNOSTICS
/usr/libexec/getty gettyargs failing, sleeping. A process being started to service a line is exiting quickly each time it is started.
This is often caused by a ringing or noisy terminal line. Init will sleep for 30 seconds, then continue trying to start the process.
WARNING: Something is hung (wont die); ps axl advised. A process is hung and could not be killed when the system was shutting down. This
is usually caused by a process which is stuck in a device driver due to a persistent device error condition.
FILES
/dev/console, /dev/tty*, /var/run/utmp, /usr/adm/wtmp, /etc/ttys, /etc/rc
SEE ALSO
login(1), kill(1), sh(1), ttys(5), crash(8), getty(8), rc(8), reboot(8), halt(8), shutdown(8)
4th Berkeley Distribution November 27, 1996 INIT(8)