[sysvinit.git] / doc / Changelog

sysvinit (2.87dsf) world; urgency=low

  * Fix typos and do minor updates in the manual pages.
  * Correct section of mountpoint(1).
  * Document -e and -t options for telinit in init(8).
  * Update address of FSF in the COPYRIGHT file.
  * Document in halt(8) that -n might not disable all syncing.
    Patch by Bill Nottingham and Fedora
  * Adjust output from "last -x".  In reboot lines, print endpoint
    of uptime too.  In shutdown lines print downtimes rather than
    the time between downs.  Fix typo in string compare in last.c.
    Patch by Thomas Hood.
  * Improve handling of IPv6 addresses in last.  Patch from Fedora.
  * Document last options in usage information, previously only
    mentioned in the manual page.
  * Add new option -F to last, to output full date string instead
    of the short form provided by default.  Patch from Olaf Dabrunz
    and SuSe.
  * Adjust build rules to make sure the installed binaries
    are stripped.
  * Increase the compiler warning level when building.
  * Fix utmp/wtmp updating on 64-bit platforms.  Patch by Bill
    Nottingham and Fedora.
  * Avoid unchecked return value from malloc() in utmpdump.
    Patch from Christian 'Dr. Disk' Hechelmann and Fedora.
  * Make sure to use execle and no execl when passing environment to
    the new process.  Patch from RedHat.
  * Correct init to make sure the waiting status is preserved across
    re-exec.  Patch from RedHat.
  * Correct init to avoid race condition when starting programs during
    boot.  Patch from SuSe.
  * Allow 'telinit u' in runlevels 0 and 6.  Patch from Thomas Hood.
  * Change install rules to make pidof an absolute symlink.  Patch from
    Thomas Hood.
  * Improve error message from init if fork() fail.  Patch found in Suse.
  * Add support for SE Linux capability handling.  Patch from Manoj
    Srivastava, adjusted to avoid aborting if SE policy was loaded in
    the initrd with patch from Bill Nottingham and Fedora.
  * Add -c option to pidof for only matching processes with the same
    process root.  Ignore -c when not running as root.  Patch from
    Thomas Woerner and Fedora.
  * Adjust init to terminate argv0 with one 0 rather than two so that
    process name can be one character longer.  Patch by Kir Kolyshkin.
  * Make sure bootlogd exit with non-error exit code when forking of
    the child successfully.
  * Add bootlogd option -s to make it possible to control the use of
    fdatasync().  Patch from Thomas Hood.
  * Add bootlogd option -c to tell it to create the log file if it does
    not exist.  Patch from Thomas Hood.
  * Let bootlogd also look at ttyB* devices to work on HPPA.  Patch
    from Thomas Hood.
  * Change init to use setenv() instead of putenv, make sure the PATH
    value is usable on re-exec.  Patch from Thomas Hood.
  * Add usleep in killall5 after killing processes, to force the kernel
    to reschedule.  Patch from SuSe.
  * Modify pidof to not print empty line if no pid was found.
  * Modify init and sulogin to fix emergency mode's tty, making sure ^C
    and ^Z work when booting with 'emergency' kernel option.  Patch from
    Samuel Thibault.
  * Modify init to allow some time for failed opens to resolve themselves.
    Patch from Bill Nottingham and Fedora.
  * Modify init to shut down IDE, SCSI and SATA disks properly.  Patches
    from Sebastian Reichelt, Werner Fink and SuSe.
  * Modify wall to use UT_LINESIZE from <utmp.h> instead of hardcoded
    string lengths.  Patch from SuSe.
  * Change wall to make halt include hostname in output.
  * Change killall to avoid killing init by mistake.  Patch from SuSe.
  * Change killall5 to use the exit value to report if it found any
    processes to kill.  Patch from Debian.
  * Add option -o opmitpid to killall5, to make it possible to skip
    some pids during shutdown.  Based on patch from Colin Watson and
    Ubuntu.
  * Add references between killall5 and pidof manual pages.  Patch from Debian.
  * Modify killall to work better with user space file system, by
    changing cwd to /proc when stopping and killing processes, and
    avoiding stat() when the value isn't used.  Also, lock process
    pages in memory to avoid paging when user processes are stopped.
    Patch from Debian and Goswin von Brederlow with changes by Kel
    Modderman.
  * Change shutdown to only accept flags -H and -P with the -h flag,
    and document this requirement in the manual page.
  * Change reboot/halt to work properly when used as a login shell.
    Patch by Dale R. Worley and Fedora.
  * Let sulogin fall back to the staticly linked /bin/sash if both roots
    shell and /bin/sh fail to execute.

 -- Petter Reinholdtsen <pere@hungry.com>  Sun, 12 Jul 2009 19:58:10 +0200

sysvinit (2.86) cistron; urgency=low

  * Fixed up bootlogd to read /proc/cmdline. Also keep an internal
    linebuffer to process \r, \t and ^H. It is becoming useable.
  * Applied trivial OWL patches
  * Block signals in syslog(), since syslog() is not re-entrant
    (James Olin Oden <joden@malachi.lee.k12.nc.us>, redhat bug #97534)
  * Minor adjustements so that sysvinit compiles on the Hurd 
  * killall5 now skips kernel threads
  * Inittab entries with both 'S' and other runlevels were broken.
    Fix by Bryan Kadzban <bryan@kadzban.is-a-geek.net>
  * Changed initreq.h to be more flexible and forwards-compatible.
  * You can now through /dev/initctl set environment variables in
    init that will be inherited by its children. For now, only
    variables prefixed with INIT_ can be set and the maximum is
    16 variables. There's also a length limit due to the size
    of struct init_request, so it should be safe from abuse.
  * Option -P and -H to shutdown set INIT_HALT=POWERDOWN and
    INIT_HALT=HALT as environment variables as described above
  * Add "mountpoint" utility.
  * Slightly better algorithm in killall5.c:pidof()
  * Added some patches from fedora-core (halt-usage, last -t,
    sulogin-message, user-console)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Fri, 30 Jul 2004 14:14:58 +0200

sysvinit (2.85) cistron; urgency=low

  * Add IPv6 support in last(1)
  * Sulogin: even if the root password is empty, ask for a password-
    otherwise there is no way to set a timeout.
  * Removed support for ioctl.save.
  * Turned of support for /etc/initrunlvl and /var/run/initrunlvl
  * Fixed warts in dowall.c ("Dmitry V. Levin" <ldv@altlinux.org>)
  * Fix init.c::spawn(). The "f" variable was used both as file descriptor
    and waitpid(2) return code.  In certain circumstances, this leads to
    TIOCSCTTY with wrong file descriptor (Vladimir N. Oleynik).
  * Fix fd leak in sulogin (Dmitry V. Levin).
  * More error checking in all wait() calling code (Dmitry V. Levin).
  * Fix argv[] initialization in spawn() (Dmitry V. Levin).
  * Change strncpy to strncat in most places (Dmitry V. Levin).

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue, 15 Apr 2003 16:37:57 +0200

sysvinit (2.84) cistron; urgency=low

  * Don't use /etc/initlvl interface for telinit; only use /dev/initctl,
    and give a clear error when that fails.
  * Add -i/--init command line flag to init - this tells init
    'behave as system init even if you're not PID#1'. Useful for
    testing in chroot/jail type environments.

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue, 27 Nov 2001 13:10:08 +0100

sysvinit (2.83) cistron; urgency=low

  * Fix bug in shutdown where it didn't check correctly for a
    virtual console when checking /etc/shutdown.allow
  * Fix race condition in waitpid() [Andrea Arcangeli]
  * Call closelog() after openlog()/syslog() since recent libc's
    keep the logging fd open and that is fd#0 aka stdin.

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue,  2 Oct 2001 23:27:06 +0200

sysvinit (2.82) cistron; urgency=low

  * Print out correct version number at startup.
  * Fix spelling of initttab in init(8)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Thu, 23 Aug 2001 17:50:44 +0200

sysvinit (2.81) cistron; urgency=low

  * Fix typo/bug in killall5/pidof, -o option failed to work since 2.79.
    Reformatted source code to prevent this from happening again.
  * shutdown.8: applied redhat manpage update
  * sulogin: applied redhat sysvinit-2.78-sulogin-nologin.patch
  * sulogin: applied redhat sysvinit-2.78-notty.patch
  * sulogin: applied redhat sysvinit-2.78-sigint.patch

sysvinit (2.80) cistron; urgency=low

  * Grammar/spelling fixes in shutdown.c (Christian Steinrueck)
  * Don't set controlling tty for non-(sysinit,boot,single) runlevels

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Thu, 26 Jul 2001 13:26:56 +0200

sysvinit (2.79) cistron; urgency=low

  * New upstream version
  * several fixes to wall by Tim Robbins <fyre@box3n.gumbynet.org>
  * Several extra boundary checks by Solar Designer
  * Make /dev/console controlling tty
  * Stricter checks on ownership of tty by mesg(1)
  * Documented and restricted -n option to wall(1)
  * Make it compile with glibc 2.2.2
  * Document IO redirection in wall manpage (closes: #79491)
  * Update README (closes: #85650)
  * Fix init.8 manpage (closes:  #75268)
  * Fix typo in halt(8) manpage (closes:  #67875)
  * Check time argument of shutdown(8) for correctness (closes: #67825)
  * Check for stale sessions in last(1) (Chris Wolf <cwolf@starclass.com>)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Wed,  4 Jul 2001 15:04:36 +0200

sysvinit (2.78-2) frozen unstable; urgency=high

  * Change "booting" to "reloading" message at reload
  * Add "-z xxx" dummy command line argument (closes: #54717)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Fri, 11 Feb 2000 12:17:54 +0100

sysvinit (2.78-1) unstable; urgency=low

  * 2.78 will be the new upstream version, I'm skipping 2.77
  * Shutdown now calls sync before switching the runlevel to 0 or 6,
    or before unmounting filesystems if -n was used (closes: #46461)
  * Some cosmetic changes to init.c (closes: #32079)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Thu, 30 Dec 1999 20:40:23 +0100

sysvinit (2.77-2) unstable; urgency=low

  * Fix last -i option

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue,  5 Oct 1999 21:51:50 +0200

sysvinit (2.77-1) unstable; urgency=low

  * Write reboot record into utmp file as well to make rms happy
  * Fork and dump core in / if SIGSEGV is received for debugging purposes
  * Patch by Craig Sanders <cas@vicnet.net.au> for "last" -i option

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Wed,  4 Aug 1999 11:16:23 +0200

sysvinit (2.76-4) unstable; urgency=low

  * Change dowall.c to handle Unix98 ptys correctly
  * Add comment in rcS about usage of setup.sh and unconfigured.sh
  * Shutdown now removes nologin file just before calling telinit
  * SEGV handler now tries to continue after sleep of 30 seconds.
    On a 386-class processor it also prints out the value of EIP.
  * Fix for racecondition in check_init_fifo() by Richard Gooch

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Sat,  8 May 1999 17:22:57 +0200

sysvinit (2.76-3) frozen unstable; urgency=high

  * Small bugfix to last.c courtesy of Danek Duvall <duvall@emufarm.ml.org>

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue, 12 Jan 1999 12:12:44 +0100

sysvinit (2.76-1) frozen unstable; urgency=high

  * Fix bug in check_pipe() which crashes init on the Alpha.

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue,  3 Nov 1998 11:09:13 +0100

sysvinit (2.75-4) unstable; urgency=low

  * Change sulogin password buffer to 128 characters.
  * Don't print control characters in dowall.c
  * Try to open getenv ("CONSOLE"), /dev/console and /dev/tty0 in order.
    For backwards compatibility when you try to boot a 2.0.x kernel
    with a linux > 2.1.70 /dev/console device.
  * Change src/Makefile for non-debian systems (mainly, RedHat)
  * Try to create /dev/initctl if not present; check every time to see
    if the dev/ino of /dev/initctl has changed and re-open it. This should
    help devfs a bit.
  * Send SIGUSR1 to init at bootup to let it re-open /dev/initctl;
    again in support of devfs.
  * Moved pidof to /bin (it's only a link to killall5 anyway)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Mon,  5 Oct 1998 14:03:14 +0200

sysvinit (2.75-2) frozen unstable; urgency=medium

  * Fix last.c again.
  * Add check to see if /dev/initctl is really a FIFO
  * In ifdown.c first down all shaper devices then the real devices

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue,  2 Jun 1998 22:43:01 +0200

sysvinit (2.75-1) frozen unstable; urgency=low

  * Rewrote last.c to be much more memory friendly and correct,
    thanks to Nick Andrew <nick@zeta.org.au> and
    David Parrish <dparrish@zeta.org.au>
  * Fixes bugs:
    #21616: sysvinit: sulogin thinks md5 root password is bad
    #21765: sysvinit: Typo in `killall5.c'
    #21775: sysvinit: sysvinit does not support MD5 hashed passwords
    #21990: /usr/bin/last: unnecessary memset and off-by-one bug
    #22084: sysvinit 2.74-4: SIGPWR missing on sparc
    #21900: init, powerfail events, and shutdown.allow
    #21702: init 0 does not work as expected...
    #21728: sysvinit: Typo in `init.c'
    #22363: sysvinit: discrepance btw. manpage and /sbin/init

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue, 19 May 1998 11:02:29 +0200

sysvinit (2.74-4) frozen unstable; urgency=medium

  * Add -o option to last to process libc5 utmp files.
  * Buffer overflow fixed in init.c (not very serious; only exploitable
    by root). Thanks to Chris Evans <chris@ferret.lmh.ox.ac.uk>

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Wed, 15 Apr 1998 17:04:33 +0200

sysvinit (2.74-1) unstable; urgency=low

  * Should compile with glibc 1.99 :)
  * Change behaviour of reboot(1) and halt(1) so that the default when
    the runlevel can't be determined is to call shutdown.
  * Added re-exec patch from Al Viro (21 Feb 1998):
        'U' flag added to telinit. It forces init to re-exec itself
        (passing its state through exec, certainly).
        May be useful for smoother (heh) upgrades.
        24 Feb 1998, AV:
        did_boot made global and added to state - thanks, Miquel.
        Yet another file descriptors leak - close state pipe if
        re_exec fails.

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Thu, 12 Mar 1998 17:42:46 +0100

sysvinit (2.73-2) unstable; urgency=low

  * Change _NSIG to NSIG for 2.1.x kernel includes.

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Thu,  8 Jan 1998 16:01:02 +0100

sysvinit (2.73-1) unstable; urgency=low

  * Use siginterrupt, now that system calls are restarted by default.
    Main symptom was that the sulogin timeout didn't work but there
    might have been more hidden problems.
  * Kill process immidiately if turned off in inittab
  * Fixed sulogin check on tty arg.
  * Use strerror() instead of sys_errlist
  * wall now supports a '-n' option to suppress [most of] the banner.
    Debian doesn't use sysvinit's wall, but apparently Redhat does.
  * Add '-F' (forcefsck) option to shutdown
  * Close and reopen /dev/initctl on SIGUSR1 (mainly for a /dev in ram)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Sat,  3 Jan 1998 16:32:39 +0100

sysvinit (2.72-3) unstable; urgency=low

  * Add extra fork() in dowall.c to avoid hanging in rare cases

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Wed, 22 Oct 1997 14:44:00 +0200

sysvinit (2.72) unstable; urgency=low

  * Applied manual page patches by Bill Hawes <whawes@star.net>.  Thanks Bill!
  * Applied patches to the sample Slackware scripts by
    "Jonathan I. Kamens" <jik@kamens.brookline.ma.us>
  * Fix halt and reboot runlevels 0 & 6 check.
  * Only say "no more processes left in runlevel x" once
  * Fix race condition with SIGCHLD in spawn()
    (thanks to Alon Ziv <alonz@CS.Technion.AC.IL>)
  * Compress all manpages (missed 2)
  * Compiled for libc6
  * Added poweroff patch by Roderich Schupp <rsch@ExperTeam.de>

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Sun, 12 Oct 1997 17:20:17 +0200

sysvinit (2.71-2) frozen unstable; urgency=low

  * Print 2.71 instead of 2.70 on startup :)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Mon, 5 May 1997 12:45:25 +0200

sysvinit (2.71-1) frozen unstable; urgency=high

  * Added code for updwtmp() in utmp.c for glibc (2.0.3)
  * Fixed all programs to use functions from utmp.c and getutent()
  * Do not try to clean up utmp in init itself (Bug#9022)
  * Removed sync() from main loop.
  * Hopefully fixes bug #8657 (shutdown signal handling)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Sat, 26 Apr 1997 19:57:27 +0200

sysvinit (2.70-1) unstable; urgency=low

  * Respawn fix
  * Removed StUdLy CaPs from source code
  * Moved files in source archive around
  * Fixes for glibc (utmp handling, signal handling).
  * Fixed '-d' option to last (now also works without '-a').
  * Added extra checking in last.c to prevent showing dead entries

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Fri, 7 Feb 1997 15:31:30 +0100

sysvinit (2.69-1) frozen unstable; urgency=medium

  * Fixed bug that can throw X in a loop (or any other app that reads from
    /dev/tty0)

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Sun, 1 Dec 1996 15:32:24 +0100

sysvinit (2.67-1) frozen unstable; urgency=high

  * Fixes problem with /dev/console being controlling terminal of some
    daemons
  * Puts copyright file in the right place

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Fri, 15 Nov 1996 12:23:33 +0100

sysvinit (2.66-1) unstable; urgency=medium

  * Skipped 2.65. A development 2.65 got out by accident and is apparently
    being used..
  * Also compiles and runs with GNU libc (and on the Alpha)
  * Fixed dowall.c not to exit when getpwuid() fails and uid == 0.
  * Fixed init panic'ing on empty lines in /etc/inittab
  * Changed default PATH to include /usr/local/sbin
  * Set /dev/console as controlling terminal for sysinit,bootwait,wait,powerwait
    This allows using ^C to interrupt some parts of eg the boot process.
  * Remove old symlink in /var/log/initlvl; let init check both
    /var/log and /etc itself.

 -- Miquel van Smoorenburg <miquels@cistron.nl>  Tue, 29 Oct 1996 13:46:54 +0100

2.66    29-Oct-1996
- Skipped 2.65. A development 2.65 got out by accident and is apparently
  being used..
- Fixed dowall.c not to exit when getpwuid() fails and uid == 0.
- Fixed init panic'ing on empty lines in /etc/inittab
- Changed default PATH to include /usr/local/sbin
- Ported to Linux/Alpha and GNU libc.
- Set /dev/console as controlling terminal for sysinit,bootwait,wait,powerwait.
  This allows using ^C to interrupt some parts of eg the boot process.
- Remove old symlink in /var/log/initlvl; let init check both
  /var/log and /etc itself.

2.64    28-Jun-1996
- Init checks CONSOLE environment variable on startup (overrides /dev/console)
- Init sets CONSOLE variable for all its children.
- Wtmp(): when zeroing out old utmp entries, keep ut_id field
- Wtmp(): try to re-use ut_id field if possible.
- SetTerm(): only read from /etc/ioctl.save if written once.
- Included start-stop-daemon, C version (source only).
- Fixed wait() for the emergency shell.
- killall5: ignore signal before doing kill(-1, pid).

2.63    14-Jun-1996
- Fixed preinst script for Debian
- Fixed init.c to become init daemon if name is init.new
- Fixed pidof to not return PIDs of shell scripts

2.62-2  09-Jun-1996
- Changed debian /etc/init.d/boot script to create a nologin file
  at boot and to remove it just before going multiuser.

2.62    31-May-1996
- Decided to release a 2.62 version with a BIG WARNING about upgrading
  init in it. Will send a patch to Linus for the linux/Documentation/Changes
  file so that 2.62 or later is mentioned as the version to upgrade to.
- Added docs for Slackware

2.61-3  29-May-1996
- Fixed debian/etc/init.d/network for the lo device.
- Added "-xdev" to the cd /tmp && find in debian/etc/init.d/boot
- Made remove time for files in /tmp configurable.

2.61    29-Apr-1996
- Changed /etc/init.d/boot script again
- Fixed problem in init.c with trailing whitespace after entries in inittab
- Fixed killall5 problems
- Added manpage for lastb
- Added SHELL= environment variable to sulogin
- Fixed sulogin & shadow problems
- Added timeout option to sulogin

2.60-2  16-Apr-1996
- Fixed sulogin (didn't work if root wasn't first entry in shadow file)
- Fixed mesg for systems with "tty" group (such as Debian)
- Fixed nsyslog() in killall5.c

2.60   01-Apr-1996
- Fixed race condition in init.c, resulting in hanging shutdowns.
  Courtesy of Max Neunhoeffer <Max.Neunhoeffer@urz.uni-heidelberg.de>.
- Fixed debian/etc/init.d/boot for swapon and mdadd
- Added architecture to debian.control
- Added manpages for rc.boot and rc.local
- Updated inittab manpage for 4-character runlevel field
- Added debian replaces for bsdutils < version_without_mesg
- Fixed init.c so that it also works with kernels 1.3.81 and up

2.59   10-Mar-1996
- Init logs less to syslog (suspected to hang in syslog() or openlog() )
- removed closelog() from init.c
- removed time check of runlevel record in halt.
- Added options to last to get hostname from ut_addr field
- Added last and mesg to installation targets
- rewrote /etc/init.d/boot a bit.

2.58-2 04-Jan-1996
- Changed etc/init.d/rc to do a stty onlcr
- Added /var/log/initrunlvl symlink

2.58-1 31-Dec-1995
- Added the latest debian files.
- Added support for 4-character id fields (if you have libc5).
- Fixed pidof (in killall5) parsing of /proc/.../stat
- Save restore GMT setting in /etc/init.d/boot

2.57d 03-Dec-1995
- Added sulogin
- Added "-b" flag to init, gives a shell before
  anything else (in case the startup scripts are screwed)
- Moved fastboot to /fastboot
- Folded in Debian patches.
- Removed old scripts
- Added debian /etc/directory.

2.57c 08-Oct-1995
- Changed over to init_request (with initreq.h)
- Processes no longer killed when "process" field
  changes, change takes effect after next respawn.

2.57b xx-Aug-1995
- Bugfix release for Debian and Slackware 3.0

2.57a 10-Jul-1995
- Fixed race condition init init.c wrt got_chld
- Fixed one-off for malloc in killall5.c
- Changed dowall.c
- Console code: no relink to /dev/systty on CTRL-ALT-DEL)

2.57 22-May-1995
- Changed a few things here and there, didn't
                  really document it :)

2.55 17-Jan-1995
- Added option to shutdown to run standalone.

2.54 12-Jan-1995
- Added GNU copyrigh to all *.[ch] files.
- added /etc/initscript
- reboot and halt now call shutdown in runlevels 1-5
- Can run from read-only root (CDROM)

2.53 10-Oct-1994
- Renamed pidof to killall5, updated all scripts to
  use killall5 instead of kill -1 ....
- Rewrote scripts to use this, and some general changes.
- Added SysV command line compatibility to shutdown.

2.52 30-Aug-1994
- Added `powerfailnow' keyword, for when UPS battery is low.
- Updated `last'.
- Fixed utmp handling (wrt. CLEAN_UTMP)
TODO:
* Make last compatible with GNU/BSD (long options?)
* update powerd
* remote SIGPWR broadcast? in powerd? (with priv. port)
* remote shutdown

2.50  14-Feb-1994
- Ignores unknown command line arguments.
- Modelled more after the "real" sysVinit
- Lots of changes all over the place.
  (like showing runlevel in "ps" listing, logging
   runlevel into utmp file etc)
- now using "reliable" signals instead of V7 style.
- Updated all scripts. Examples are in two directories:
  etc (normal) and etc-sysv (sysv style scripts).
- runlevel 0 = halt, 1 = single user, 6 = reboot.
- added support for serial console.
- updated Propaganda, manpages.
- added shutdown access control.

2.4  24-May-93
- Send out the official version into the world as
  SysVinit-2.4.tar.z.

2.4g 15-May-93
- Changed init to really catch SIGPWR 'cause we
  hooked up an UPS to the Linux machine. The
  keyword for catching the TreeFingerSalute is
  now "ctrlaltdel" instead of "power{wait,fail}".

2.4a 22-Apr-93
- Fixed last to reckognize BSD style wtmp logging.
- Changed init to write wtmp records that are
  SysV compliant but are also reckognized by the
  BSD last. Added a '+' option to the 'process'
  field of inittab, for getties that want to do
  their own utmp/wtmp housekeeping (kludge!).
- Now accepts a runlevel on the command line,
  and reckognizes the 'auto' argument. (Sets the
  environment variable AUTOBOOT to YES)

2.2.3 24-Mar-93
- Ripped out the 'leave' action. To difficult, and
  unneeded.
- Going single user now kills _all_ processes.
- Added '-t secs' option to all commands.
- This version is stable enough to post.

2.2 02-Mar-93
- Made wait()'s asynchronous
- Changed whole thing to one big state machine
- Now using 'pseudo levels' # & * for SYSINIT & BOOT
- Added a new type of 'action', called leave. This
  process will be executed when the system goes from a
  runlevel specified in it's runlevel field to a 
  level that's not. Nice to bring down NFS and the like.

2.1 28-Jan-93
- Fixed a bug with 'boot' and 'once'.
- Check 'initdefault' for validity.
- Reckognizes "single" as command line argument.
- Retries execvp with 'sh -c exec ..' if command
  is a shell script. (shouldn't execvp do this?)
- Added patches to use syslog if defined.

2.0 08-Dec-92
- Rewrote the code totally, so started with a new
  version number.
- Dropped Minix support, this code now is Linux - specific.
- With TEST switch on, this init & telinit can
  run standalone for test purposes.

1.3, 05-Jul-92
- Got a 386, so installed Linux. Added 'soft' reboot
  to be default under linux. Fixed some typos.

1.2, 16-Jun-92
- Bugreport from Michael Haardt ; removed deadlock
  and added 'waitpid' instead of 'wait' for SYSV.

1.1, 30-Apr-92
- Read manual wrong: there is no 'action' field called
  process, but all entries are of type process. Every
  'process' get exec'ed by /bin/sh -c 'exec command'.
- Rapidly respawning processes are caught in the act.
- _SYSV support is really Linux support,
  done by poe@daimi.aau.dk on 25-Mar-92.

 1.0, 01-Feb-92
- Initial version, very primitive for the Minix
  operating system. Required some mods. to the
  kernel.