MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

Convert usr.sbin to LIBADD
Reduce overlinking

Replace all uses of libncurses and libtermcap with their wide character
variants. This allows usable file system images (i.e. those with both a
shell and an editor) to be created with only one copy of the curses library.

Exp-run: antoine
PR: 189842
Discussed with: bapt
Sponsored by: DARPA, AFRL

mdoc: order prologue macros consistently by Dd/Dt/Os

Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.

Reviewed by: ru
Approved by: philip, ed (mentors)

The last big commit: let usr.sbin/ use WARNS=6 by default.

Expand *n't contractions.

Sort sections.

Handle select() returning -1/EINTR - fairly common in these KSE days.

PR: 74972
MFC after: 3 days

Mechanically kill hard sentence breaks.

Apply s/LIBC_R/LIBPTHREAD/ to the DPADD variable. The LDADD variable
already had s/libc_r/libpthread/ applied to it.

s/-lc_r/-lpthread/

Add IPv6 support to pppctl by using getaddrinfo() and trying each address
it returns. This allows it to connect to the server side again, which
has been listening on IPv6 addresses exclusively for more than 2 years.

PR: 59369

add FBSDID

style.Makefile(5)

The .Nm utility

*** empty log message ***

Better handling of the return from snprintf

Use STD{ERR,IN,OUT}_FILENO instead of their numeric values. The
definitions are more readable, and it's possible that they're
more portable to pathalogical platforms.

Submitted by: David Hill <david@phobia.ms>

Perform a major cleanup of the usr.sbin Makefiles.
These are not perfectly in agreement with each other style-wise, but they
are orders of orders of magnitude more consistent style-wise than before.

Remove GCC'isms in CFLAGS.

Remove whitespace at EOL.

mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: remove extraneous .Pp before and/or after .Sh.

mdoc(7) police: normalize .Nd.

- Backout botched attempt to introduce MANSECT feature.
- MAN[1-9] -> MAN.

Issue a ``quit'' after other ppp commands given on the command line and
then wait for the connection to be closed by the peer.

This means that commands such as ``pppctl ... show links'' will
display the correct output again (rather than truncating it depending
on how much data arrived in the last packet).

Set the default manual section for usr.sbin/ to 8.

A NetBSD specific fix
Kind-of obtained from: NetBSD

mdoc(7) police: split punctuation characters + misc fixes.

-pthread -> -lc_r

mdoc(7) police: use canonical form of .Dd macro.

Change interactive mode so that a monitor thread keeps an eye on the
ppp descriptor and signals the terminal thread when there's something
to read on that descriptor.

This means that the main loop doesn't have to alarm() itself into
dropping out of el_gets() frequently to check the descriptor. This
dropping out was disturbing syscons (via ioctl()s from libedit) enough
to reset the screensaver timeout every .5 of a second.

PR: 20345

Use Fx macro wherever possible.

libutil is no longer required as setproctitle() has moved to libc

If the -p option is used, use setproctitle() to hide it's argument
(a password) asap.

Add another example showing how you can use pppctl to only allow
dial out at certain times of the day.

Approved by: brian

NetBSD has changed the el_init() prototype

Submitted by: Kazuyoshi Kato <kazk@yyy.or.jp>

$Id$ -> $FreeBSD$

Use err[x]/warn[x] and improve error reporting
Submitted by: charnier

Add support for NetBSD (history() from libedit is different).

Mention the error when we fail to connect().

Sort cross references.

Remove OpenBSD build support - let the Makefile vary per
OS rather than making it a mess and potentially screwing
up cross builds.
Suggested by: bde

Add OpenBSD build support
Remove -Wmissing-prototypes

.Sh ENVIRONMENT VARIABLES -> .Sh ENVIRONMENT

PR: 6599
Reviewed by: phk
Submitted by: Josh Gilliam <josh@quick.net>

Quiet -Wall in gcc-2.8.1
Obtained from: OpenBSD

Remove bogus timeout code in Receive().
Don't read(fd, buffer, 0) and think ppp has closed the
connection when `buffer' is full, instead, flush most of
buffer to the terminal and read() for a reasonable length.
This fixes "show route" when there's more than 2k of
routing output.

Add (BSD) copyright headers.

Cosmetic: Tidy up.
Submitted by: Theo de Raadt <deraadt@cvs.openbsd.org>

Zero struct sockaddr_??s before filling them in.
Suggested by: Theo de Raadt <deraadt@cvs.openbsd.org>

Correct the "how to find out if the line is up" example.

"No reply from ppp" -> "Connection closed".
"No reply" sounds like the message didn't get through (for
example when you `pppctl xxxx quit all'.

Remove an unnecessary (and wrong) cast.

Add Id string.

Notice that ppp has closed the connection properly.
Remove the timeout hack to notice that ppp has closed the connection.
Remove the ``special case'' hacks for "quit" and "bye", as pppctl
now exits immediately when the connection is closed by ppp.
Suggest a secure "set server" line for connecting ppp & pppctl.
Tidy up and correct a few man page typos.

Use select() instead of poll() for portabilities sake.

Poll the socket descriptor while in el_gets()
so that our display is scribbled over as we
requested.

Prompt correctly when ppp *doesn't* ask for a password.

Style police.
bzero -> memset
index -> strchr
rindex -> strrchr
Use libedit (this should make pppctl a lot more attractive than telnet).

Support interactive mode.

Add a few examples.

Sort cross refereces in section SEE ALSO.

Allow hosts specified by IP number (avoiding
a DNS lookup)
Update doc including the [host:]port syntax.

Support "host:port" as first arg.

Allow command line control of ppp through both
TCP and AF_LOCAL sockets.