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OpenSolaris 2009.06 - man page for inittab (opensolaris section 4)

inittab(4)				   File Formats 			       inittab(4)

NAME
       inittab - script for init

DESCRIPTION
       The  /etc/inittab  file controls process dispatching by init. The processes most typically
       dispatched by init are daemons.

       It is no longer necessary to edit the /etc/inittab file	directly.  Administrators  should
       use  the  Solaris  Service  Management Facility (SMF) to define services instead. Refer to
       smf(5) and the System Administration Guide: Basic Administration for more  information  on
       SMF.

       To  modify  parameters  passed to ttymon(1M), use svccfg(1M) to modify the SMF repository.
       See ttymon(1M) for details on the available SMF properties.

       The inittab file is composed of entries that are position dependent and have the following
       format:

       id:rstate:action:process

       Each  entry  is delimited by a newline; however, a backslash (\) preceding a newline indi-
       cates a continuation of the entry. Up to 512 characters for each entry are permitted. Com-
       ments  may be inserted in the process field using the convention for comments described in
       sh(1). There are no limits (other than maximum  entry  size)  imposed  on  the  number  of
       entries in the inittab file. The entry fields are:

       id	  One to four characters used to uniquely identify an entry. Do not use the char-
		  acters "r" or "t" as the first or only character in this field.  These  charac-
		  ters are reserved for the use of rlogin(1) and telnet(1).

       rstate	  Define  the run level in which this entry is to be processed. Run-levels effec-
		  tively correspond to a configuration of processes in the system. That is,  each
		  process  spawned  by	init is assigned a run level(s) in which it is allowed to
		  exist. The run levels are represented by a number ranging from 0 through 6. For
		  example,  if the system is in run level 1, only those entries having a 1 in the
		  rstate field are processed.

		  When init is requested to change run levels, all processes that do not have  an
		  entry  in the rstate field for the target run level are sent the warning signal
		  SIGTERM and allowed a 5-second grace period before being forcibly terminated by
		  the  kill signal SIGKILL. The rstate field can define multiple run levels for a
		  process by selecting more than one run level in any combination from 0  through
		  6. If no run level is specified, then the process is assumed to be valid at all
		  run levels 0 through 6.

		  There are three other values, a, b and c, which can appear in the rstate field,
		  even	though	they are not true run levels. Entries which have these characters
		  in the rstate field are processed only when an init or telinit process requests
		  them	to  be	run  (regardless  of  the  current  run level of the system). See
		  init(1M). These differ from run levels in that init can never enter  run  level
		  a, b or c. Also, a request for the execution of any of these processes does not
		  change the current run level. Furthermore, a process started by an a,  b  or	c
		  command  is  not killed when init changes levels. They are killed only if their
		  line in inittab is marked off in  the  action  field,  their	line  is  deleted
		  entirely from inittab, or init goes into single-user state.

       action	  Key  words  in  this	field tell init how to treat the process specified in the
		  process field. The actions recognized by init are as follows:

		  respawn      If the process does not exist, then start the process; do not wait
			       for its termination (continue scanning the inittab file), and when
			       the process dies, restart the process. If  the  process	currently
			       exists, do nothing and continue scanning the inittab file.

		  wait	       When  init  enters  the run level that matches the entry's rstate,
			       start the process and wait for  its  termination.  All  subsequent
			       reads  of  the  inittab	file  while init is in the same run level
			       cause init to ignore this entry.

		  once	       When init enters a run level  that  matches  the  entry's  rstate,
			       start  the process, do not wait for its termination. When it dies,
			       do not restart the process. If init enters a new run level and the
			       process	is  still  running  from a previous run level change, the
			       program is not restarted.

		  boot	       The entry is to be processed only at init's boot-time read of  the
			       inittab	file.  init  is to start the process and not wait for its
			       termination; when it dies, it does not  restart	the  process.  In
			       order  for this instruction to be meaningful, the rstate should be
			       the default or it must match init's run level at boot  time.  This
			       action  is useful for an initialization function following a hard-
			       ware reboot of the system.

		  bootwait     The entry is to be processed the first time init goes from single-
			       user  to  multi-user state after the system is booted. init starts
			       the process, waits for its termination and, when it dies, does not
			       restart the process.

		  powerfail    Execute	the  process  associated  with	this entry only when init
			       receives a power fail signal, SIGPWR (see signal(3C)).

		  powerwait    Execute the process associated with  this  entry  only  when  init
			       receives a power fail signal, SIGPWR, and wait until it terminates
			       before continuing any processing of inittab.

		  off	       If the process associated with this entry  is  currently  running,
			       send the warning signal SIGTERM and wait 5 seconds before forcibly
			       terminating the process with  the  kill	signal	SIGKILL.  If  the
			       process is nonexistent, ignore the entry.

		  ondemand     This instruction is really a synonym for the respawn action. It is
			       functionally identical to respawn but is given a different keyword
			       in order to divorce its association with run levels. This instruc-
			       tion is used only with the a, b	or  c  values  described  in  the
			       rstate field.

		  sysinit      Entries	of this type are executed before init tries to access the
			       console (that  is,  before  the	Console  Login:  prompt).  It  is
			       expected  that  this entry will be used only to initialize devices
			       that init might try to ask the run level question.  These  entries
			       are  executed  and init waits for their completion before continu-
			       ing.

       process	  Specify a command to be executed. The entire process	field  is  prefixed  with
		  exec	and  passed  to a forked sh as sh -c 'exec command'. For this reason, any
		  legal sh syntax can appear in the process field.

SEE ALSO
       sh(1), who(1), init(1M), svcadm(1M), svc.startd(1M), ttymon(1M),  exec(2),  open(2),  sig-
       nal(3C), smf(5)

       System Administration Guide: Basic Administration

NOTES
       With the introduction of the service management facility, the system-provided /etc/inittab
       file is greatly reduced from previous releases.

       The initdefault entry is not recognized in Solaris 10. See smf(5) for information  on  SMF
       milestones,  and  svcadm(1M), which describes the "svcadm milestone -d" command; this pro-
       vides similar functionality to modifying the initdefault entry in previous versions of the
       Solaris OS.

SunOS 5.11				    9 Dec 2004				       inittab(4)


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