tail: Clean up error messages.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D42842

Remove copyright strings ifdef'd out

We've ifdef'd out the copyright strings for some time now. Go ahead and
remove the ifdefs. Plus whatever other detritis was left over from other
recent removals. These copyright strings are present in the comments and
are largely from CSRG's attempt at adding their copyright to every
binary file (which modern interpretations of the license doesn't
require).

Sponsored by: Netflix

usr.bin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: two-line .c pattern

Remove /^#include\s+<sys/cdefs.h>.*$\n\s+__FBSDID\("\$FreeBSD\$"\);\n/

Mark usage function as __dead2 in programs where it does not return

In most cases, usage does not return, so mark them as __dead2. For the
cases where they do return, they have not been marked __dead2.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/735

tail: Fix misleading indentation in ARG() macro.

Reviewed by: imp, emaste
Reported by: GCC
Differential Revision: https://reviews.freebsd.org/D36810

tail: Initialize the stat buffer used when input is stdin

PR: 266284
Reported by: Jenkins via delphij
Fixes: 7e11889959a6 ("tail: Fix -f with stdin")
MFC after: 3 days

Improve usability of head(1) and tail(1):

- Consistently support -q (quiet) and -v (verbose)
- Allow specifying numbers with SI prefixes supported by expand_number(3)
- Remove 2^31 limit on lines for head(1)

MFC after: 2 weeks
Reviewed by: lwhsu, pauamma, gbe
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D35720

tail: Fix -f with stdin

Based on a patch from swills@.

MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D31113

Fix tail -f in capability mode.

We were not adding CAP_EVENT to input file capabilities, so kevent()
always failed with ENOTCAPABLE. tail implements a fallback mode to
poll the file in this case, so the failure was not apparent.

Reviewed by: emaste
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22709

fileargs_init() sets errno on failure.

Sponsored by: The FreeBSD Foundation

tail: fix the checks if the file was rotated

The freopen(3) was replaced with fileargs_open(3) and fclose(3).
In the following function, we skip if the stream is standard in, so it is
safe to do so.
This also requires us to change the logic first to open the file and then
check its status. The stat(2) is disallowed in capability mode.

This commit unbrakes the -F option.
The bug was introduced in the r348708.

Reported by: pho
Tested by: pho

tail: style nits

tail: fix style nit introduced in the r348708

tail: capsicumize

Submitted by: Nik Sultana <sultana@seas.upenn.edu>
Differential Revision: https://reviews.freebsd.org/D20393

tail(1): Add some long options

Add --blocks, --bytes, and --lines long options for -b, -c, and -n
respectively. This improves tail(1)'s compatibility with its GNU counterpart
in a straightforward way.

Reviewed by: eadler (earlier version)
MFC after: 3 days

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

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.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

Print file names without stdio buffering to avoid mixing buffered and
unbuffered ouput.

PR: bin/176886
Reviewed by: mjg

Add missing static keywords to tail(1)

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Change the behaviour of -F slightly; it now persists (forever) in
trying to open files rather than giving up when it encounters an
error. ENOENT errors are not reported.

As a result, files that are moved away then recreated are not at
risk of being 'lost' to tail. Files that are recreated and
temporarily have unreadable permissions will be shown when they
are fixed.

This behaviour is consistent with the GNU version of tail but
without the verbiage that goes with the GNU version.

This change also fixes error messages accompanying -f and -F.
They no longer report problems with (null)!

MFC after: 3 weeks

- Import the HEAD csup code which is the basis for the cvsmode work.

initialize variables, WARNS=6 compliant

- Simplify the formatting in the SYNOPSIS.
- Add the forgotten new option in usage().

Add a -q option to suppress header lines when multiple files are specified.

Approved by: cperciva (mentor)
MFC after: 1 week

Back out revision 1.19 and 1.20 until I find mental clarity to deal with
issues bde pointed out.

Remove an errno reset that became unnecessary.

Noticed by: juli

We are past 4.4BSD - use our new-found stat flags for pipes and fifos.

Add support for following more than one file i.e.
tail -f file1 file2

Revert a WIP change that shouldn't have been in last commit.

Convert to ANSI style function definitions.

WARNS=4, add

remove __P

WARNS=2 fixes, use __FBSDID().

Allow "obsolete" (but commonly-used) command line style to be used
with -F, e.g. tail -1 -F /var/log/messages.

Submitted by: Maxim Konovalov <maxim@macomnet.ru>

File positions are off_t nowdays, not long, so:
long -> off_t
strtol -> strtoll
fseek -> fseeko

NOTE: that fseek not works for >long offsets files per POSIX:

[EOVERFLOW] For fseek( ), the resulting file offset would be a value which
cannot be represented correctly in an object of type long.

Mention the -F in the usage().

PR: 24586
Submitted by: Cyrille Lefevre <clefevre@citeweb.net>

Remove register keyword usage with prejudice.
Modern compilers are smarter when it comes to allocating register
usage.

Use a size_t instead of an int.

Properly constify some static arrays.

Also #if out some sccsid's and add rcsid's.

Clean up some ambiguous nested if/elses.

Add a new -F flag which is a superset of -f. It will cause tail to
stat() the file being followed and do a close/reopen if the file has been
renamed and/or rotated. This is damn useful for leaving running on files
in /var/log when newsyslog(8) rotates them.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Dont forget to #include <err.h>

Argh! caught! *blush*.. This program was supplying it's own 'err' routine
which was slightly different to the libc one. To save any more cunfusion,
use the libc one.

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