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init(8)			    System Manager's Manual		       init(8)

Name
       init - process control initialization

Syntax
       /bin/init [ options ]

Description
       The ULTRIX system invokes the command as	the last step in the boot pro-
       cedure.	The system normally then runs the automatic  reboot  sequence,
       as  described  in  If succeeds, the command begins multiuser operation.
       If fails, begins	single-user operation by giving	the superuser a	 shell
       on the console.

       You  can	 use  the  command so that parameters are passed from the boot
       program to so that multiuser operation begins  immediately.   When  the
       superuser  terminates  the single-user shell (by	pressing CTRL/D), runs
       the command file	without	the reboot parameter.  This command file  per-
       forms  housekeeping operations such as removing temporary files,	mount-
       ing file	systems, and starting daemons.	For further information, see

       In multiuser operation, creates a process for each terminal port	 where
       a  user	may  log  in.  To begin	such operations, it reads the file For
       further information, see	For each terminal that is marked ``on''	in the
       file,  forks  and  invokes  the command specified for the current line.
       The command is passed the name of the terminal as  the  last  argument.
       The  other  arguments  (if  any)	are specified after the	command	in the
       file.  Usually, the command is but it may be any	command.

       The command reads the user's name and invokes to	log in	the  user  and
       execute the shell.

       Ultimately,  the	 shell terminates because of an	end-of-file.  The end-
       of-file may be typed explicitly or generated as a result	of hanging  up
       on  a  terminal line.  The main path of which has been waiting for such
       an event, wakes up and removes the  appropriate	entry  from  the  file
       which  records current users.  The command then makes an	entry in which
       maintains a history of logins and logouts.  The entry is	made only if a
       user logged in successfully on the line.	 Then the appropriate terminal
       is reopened and is reinvoked.

       The command catches the signal (signal SIGHUP)  and  interprets	it  to
       mean  that  the	file  should be	read again.  The shell process on each
       line which used to be active in 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 phone lines	 with-
       out  rebooting  the system by changing the file and sending a signal to
       the process, using kill -HUP 1.

       The command terminates multiuser	 operations  and  resumes  single-user
       mode  if	it receives a terminate	(TERM) signal.	That is, the superuser
       types kill -TERM	1.  If there are processes outstanding which are dead-
       locked  (due  to	 hardware or software failure),	does not wait for them
       all to die, but times out after 30 seconds and prints  a	 warning  mes-
       sage.

       If  receives a terminal stop signal (the	superuser types	kill -TSTP 1),
       stops creating new processes and	lets the system	slowly	die  away.   A
       later hangup will resume	full multiuser operations, or a	terminate will
       initiate	a single user shell.  This feature is used by and

       If dies,	the system will	reboot itself automatically.  If, at bootstrap
       time,  the process cannot be located, the system	will loop in user mode
       at location 0x13.

Options
       -a   Specifies that the system should  autoreboot  to  multiuser	 mode.
	    This  option  is  similar  to  specifying to the console prompt or
	    specifying either with the -r option or from the command line.

       -s   Specifies that the system should boot to single-user mode.

Diagnostics
       WARNING:	Something is hung (wont	die); ps axl advised
       The system is shutting down and cannot kill a  certain  process.	  This
       usually occurs when a process cannot exit a device driver due to	a per-
       sistent device error condition.

       init: `command  tty' failing, sleeping.
       The command tried to spawn a new	process	(use the system	call) for  the
       command	five times.  Each time,	the command failed.  This may indicate
       that the	command	was invoked with invalid arguments.   Check  the  file
       for errors.  This error message is printed at level LOG_ERR.

       init: exec failed: cmd=	command	reason
       The  command tried to spawn a new process using the system call for the
       command.	 The failed.  The reason is the	explanation  produced  by  the
       routine	for  why  the  failed.	This error message is printed at level
       LOG_ERR.

Files
       Lists current system users

       History of logins and logouts

       The		command	reads this file	for a command to  execute  for
			the terminal line

       Command file executed by

See Also
       ttys(5),	getty(8), rc(8), reboot(8)

				     RISC			       init(8)

Name | Syntax | Description | Options | Diagnostics | Files | See Also

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