ttys: Add 'ifexists' option to enable ttys only if exists

Implement the 'ifexists' ttys option in init(8) to enable a tty only if
it exists. This allows one to turn off getty for ttys that aren't
p

ttys: Add 'ifexists' option to enable ttys only if exists

Implement the 'ifexists' ttys option in init(8) to enable a tty only if
it exists. This allows one to turn off getty for ttys that aren't
present (e.g., on a headless system), and thus prevent getty error logs
from filling up /var/log/messages; e.g.,

------
Sep 20 09:13:07 microserver getty[236362]: open /dev/ttyv0: No such file or directory
Sep 20 09:13:07 microserver getty[236404]: open /dev/ttyv0: No such file or directory
Sep 20 09:13:07 microserver getty[236405]: open /dev/ttyv0: No such file or directory
Sep 20 09:13:07 microserver getty[236406]: open /dev/ttyv0: No such file or directory
Sep 20 09:13:07 microserver getty[236407]: open /dev/ttyv0: No such file or directory
Sep 20 09:13:07 microserver init: getty repeating too quickly on port /dev/ttyv0, sleeping 30 secs
------

Update the ttys(5) and getttyent(3) man pages accordingly.

The updates to ttys files will follow.

Discussed-with: dillon
Credit: https://reviews.freebsd.org/D10037

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world: Staticize various variables and also remove a couple of unused ones.

Adjust numerous manual pages, scripts and Makefiles for the utmp removal.

Also remove /var/run/utmp and /var/log/lastlog via 'make upgrade'. Keep
any /var/log/wtmp and /var/log/wtmp.* files in case

Adjust numerous manual pages, scripts and Makefiles for the utmp removal.

Also remove /var/run/utmp and /var/log/lastlog via 'make upgrade'. Keep
any /var/log/wtmp and /var/log/wtmp.* files in case the user wants to
convert them with wtmpcvt(1).

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init(8): Switch to utmpx. Drop utmp support.

init(8): Pass waitpid() status to clear_session_logs() and log to wtmpx.

Taken-from: NetBSD

init(8): Put utmp/wtmp specific code under SUPPORT_UTMP.

init/oinit: Remove some old, unused/obsolete paths and comments.

Seems the _PATH_SLOGGER was defined but not used since at least 4.4BSD.

Reported-by: aly

Remove a number of duplicated includes in userland.

Remove usage of syslog(3)'s LOG_ODELAY because it is the default.

Convert from __arysize to NELEM

Try to use a single macro across the board

Discussed-with: zrj, swildner

init(8): Convert to use sig_atomic_t.

Instead of returning function pointer, now return enum for the next state.

Avoids -Wcast-function-type warnings.

Taken-from: OpenBSD

Fix seg-faults on crypt(3) failure

ttys - Add 'ifconsole' option to ttys entries

* Add the 'ifconsole' option. This allows you to construct a line as shown
below to enable a getty (e.g. on a serial port) only if the tty is the
s

ttys - Add 'ifconsole' option to ttys entries

* Add the 'ifconsole' option. This allows you to construct a line as shown
below to enable a getty (e.g. on a serial port) only if the tty is the
system console.

ttyd0 "/usr/libexec/getty std.9600" dialup on secure ifconsole

The ifconsole option also silently disables any devices which do not
exist, removing unnecessary console spam.

* Modify libc and init to handle the new flag.

* Modify the nrelease build and ttys defaults to use this option for
ttyd0, ttyd1, ttyd2, and ttyd3.

* Avoids previously reported issues with system crashes on certain machines
whos serial ports are not implemented properly without having to fully
disable the default ttyd* getty feature. If the serial port isn't the
console, it won't be enabled.

* Add a sysctl to the kernel which init needs to test whether a tty is the
console or not.

Suggested-by: swildner

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Correct BSD License clause numbering from 1-2-4 to 1-2-3.

Apparently everyone's doing it:
http://svnweb.freebsd.org/base?view=revision&revision=251069

Submitted-by: "Eitan Adler" <lists at eitanadl

Correct BSD License clause numbering from 1-2-4 to 1-2-3.

Apparently everyone's doing it:
http://svnweb.freebsd.org/base?view=revision&revision=251069

Submitted-by: "Eitan Adler" <lists at eitanadler.com>

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Remove advertising header from all userland binaries.

From: Eitan Adler <lists@eitanadler.com>

init(8): Resurrect kern.shutdown_timeout as kern.init_shutdown_timeout.

Taken from FreeBSD. Quoting their commit msg:

Fix system shutdown timeout handling by again supporting longer running
shutdow

init(8): Resurrect kern.shutdown_timeout as kern.init_shutdown_timeout.

Taken from FreeBSD. Quoting their commit msg:

Fix system shutdown timeout handling by again supporting longer running
shutdown procedures (which have a duration of more than 120 seconds).

We have two user-space affecting shutdown timeouts: a "soft" one in
/etc/rc.shutdown and a "hard" one in init(8). The first one can be
configured via /etc/rc.conf variable "rcshutdown_timeout" and defaults
to 30 seconds. The second one was originally (in 1998) intended to be
configured via sysctl(8) variable "kern.shutdown_timeout" and defaults
to 120 seconds.

Unfortunately, the "kern.shutdown_timeout" was declared "unused" in 1999
(as it obviously is actually not used within the kernel itself) and
hence was intentionally but misleadingly removed in revision 1.107 from
init_main.c. Kernel sysctl(8) variables are certainly a wrong way to
control user-space processes in general, but in this particular case the
sysctl(8) variable should have remained as it supports init(8), which
isn't passed command line flags (which in turn could have been set via
/etc/rc.conf), etc.

As there is already a similar "kern.init_path" sysctl(8) variable which
directly affects init(8), resurrect the init(8) shutdown timeout under
sysctl(8) variable "kern.init_shutdown_timeout". But this time document
it as being intentionally unused within the kernel and used by init(8).
Also document it in the manpages init(8) and rc.conf(5).

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Sweep-fix comparing pointers with 0 (and assigning 0 to pointers).

For better readability, don't compare pointers with 0 or assign 0
to them. Use NULL instead.

The change was done with coccinelle.

Remove some __STDC__ checks.

Initial import of binutils 2.22 on the new vendor branch

Future versions of binutils will also reside on this branch rather
than continuing to create new binutils branches for each new version.

Replace all casts of NULL to something with NULL.

Generally use NULL instead of explicitly casting 0 to some pointer type (part2).

Generally use NULL instead of explicitly casting 0 to some pointer type.

init(8): Fix amd64 warnings.

Fix some mis-usages of NULL.

Cleanup:

- Remove 'register' storage class specifiers.