find: add SIGINFO handler

Print number of files processed and path currently being processed on
SIGINFO.

Reviewed by: des, asomers
Sponsored by: Axcient
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D43380

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 $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\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

find(1): deLINTify

find(1): remove unused variable

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

find: Correctly propagate -exec/-execdir ... {} + exit status.

As per POSIX, the -exec ... {} + primary always returns true, but a non-zero
exit status causes find to return a non-zero exit status itself. GNU does
the same, and also for -execdir ... {} +.

It does not make much sense to return false from the primary only when the
child process happens to be run.

The behaviour for -exec/-execdir ... ; remains unchanged: the primary
returns true or false depending on the exit status, and find's exit status
is unaffected.

find: Run when cwd cannot be opened, except with -execdir or -delete.

fts(3) can run (albeit more slowly and imposing the {PATH_MAX} limit) when
the current directory cannot be opened. Therefore, do not make a failure to
open the current directory (for returning to it later in -exec) fatal.

If -execdir or -delete are used, the expectation is that fts(3) will use
chdir to avoid race conditions (except for -execdir with -L). Do not break
this expectation any more than it already is by still failing if the current
directory cannot be opened.

find: Do not pass fd to save current directory to child processes.

This removes one of the two wrongly passed file descriptors. The other one
appears to be from fts(3).

MFC after: 1 week

find: Remove unnecessary and inconsistent initialization.

Submitted by: jhb

find: Implement real -ignore_readdir_race.

If -ignore_readdir_race is present, [ENOENT] errors caused by deleting a
file after find has read its name from a directory are ignored.

Formerly, -ignore_readdir_race did nothing.

PR: bin/169723
Submitted by: Valery Khromov and Andrey Ignatov

Replace char copyright[] by static const char copyright[].

It seems the latter is used throughout the tree.

find: Exit if there is an unknown option.

Ignoring the parameter with the unknown options is unlikely to be what was
intended.

Example:
find -n .

Note that things like
find -n
already caused an exit, equivalent to "find" by itself.

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.

Revert r207677 which is considered a violation of style(9).

Pointed out by: bde
Pointy hat to: delphij

Move SCCS tags to comments as they were already #if 0'ed.

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.

Revert most part of 200420 as requested, as more review and polish is
needed.

Remove unneeded header includes from usr.bin/ except contributed code.

Tested with: make universe

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

Fix SYNOPSIS and usage().

Fix all WARNS. Checked with "make WARNS=9". Remove unused file.

Fix SCM IDs.

Remove __P().

1) Remove -Wall from Makefile.
2) WARNs fixes (rename option to lookup_option to avoid shadowing, rename
argv to argv1 to avoid shadowing, const stuff, prototypes, __unused).
3) Remove "register"s.

Implement the following options and primaries:

-E Interpret regular expressions followed by -regex and -iregex op-
tions as extended (modern) regular expressions rather than basic
regular expressions (BRE's). The re_format(7) manual page fully
describes both formats.

-iname pattern
Like -name, but the match is case insensitive.

-ipath pattern
Like -path, but the match is case insensitive.

-regex pattern
True if the whole path of the file matches pattern using regular
expression. To match a file named ``./foo/xyzzy'', you can use
the regular expression ``.*/[xyz]*'' or ``.*/foo/.*'', but not
``xyzzy'' or ``/foo/''.

-iregex pattern
Like -regex, but the match is case insensitive.

These are meant to be compatible with other find(1) implementations
such as GNU's or NetBSD's except regexp library differences.

Reviewed by: sobomax, dcs, and some other people on -current

This patch adds the -mindepth and -maxdepth options to find(1), which
behave as in GNU find (and of course as described in the manual page
diff included). I think these options would be useful for some people.

Some missing $FreeBSD$ tags are also added.

The patch was slightly modified (send-pr mangling of TABS).

PR: bin/18941
Submitted by: Ben Smithurst <ben@scientia.demon.co.uk>

Fixed my English fixes.

Fixed disorder and and usage message. Improved English.

Broken in: previous commit

Added a sort option to find(1).

The sort option make it possible to build the locate
database without large (usually 20-100MB) temp files.

Eliminate a variable that is set but never used.

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

Merge from Lite2 - use new getvfsbyname() and related changes.
understand whiteouts (FTS_W from fts()).

Import some parts of CSRG 4.4BSD-Lite2 usr.bin sources to fix tree build.

Localize it

Remove trailing whitespace.

BSD 4.4 Lite Usr.bin Sources