touch: Allow setting the timestamp to -1.

Note that VFS internally interprets a timestamp of -1 as “do not set”,
so this has no effect, but at least touch won't incorrectly reject the
given date / time (1969-12-31 23:59:59 UTC) as invalid.

While here, fix some style issues.

MFC after: 1 week
Reviewed by: allanjude
Differential Revision: https://reviews.freebsd.org/D44504

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/

touch: don't leak descriptor if fstat(2) fails

If fstat(2) fails the close(2) won't be called, which will leak the
file descriptor.

The idea was borrowed from OpenBSD, where similar patch
was applied for futimens(2).

MFC after: 1 week

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

touch: Fix some subtle bugs related to NULL times fallback:

* Do not subvert vfs.timestamp_precision by reading the time and passing
that to utimensat(). Instead, pass UTIME_NOW. A fallback to a NULL times
pointer is no longer used.

* Do not ignore -a/-m if the user has write access but does not own the
file. Leave timestamps unchanged using UTIME_OMIT and do not fall back to
a NULL times pointer (which would set both timestamps) if that fails.

Reviewed by: bde

cp,mv,touch: Set timestamps with nanosecond precision.

This uses utimensat().

Constify where appropriate.

Reported by: emaste
Approved by: cperciva (mentor)
MFC After: 3 days

Cleanups to touch.c
- use const where appropriate
- use static where appropriate
- use explicit checks checks for error conditions

Reviewed by: sbruno
Approved by: cperciva (mentor)
Obtained by: DragonFlyBSD

touch: Add the -d option from POSIX.1-2008.

This is much like -t but with a different format which is ISO8601-like and
allows fractions of a second.

The precision is limited to microseconds because of utimes() and friends,
even though stat() returns nanoseconds.

MFC after: 10 days

Remove useless and potentially dangerous rw() function which tries to
update access and modification times by reading and writing the file.
chmod(2) in rw() doesn't help because utimes(2) allow owner and the
super-user to change times. Using just utimes(2) should be sufficient.

The -f option becomes no-op.

Reviewed by: jilles

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.

Change all our own code to use st_*tim instead of st_*timespec.

Also remove some local patches to diff(1) which are now unneeded.

MFC r198175:

- If lstat()/stat() fails with an error other than ENOENT, don't ignore
the error and assume that the file doesn't exist. Touch could return
success with -c option even if the file existed and time was not set.
- If the first utimes_f() call fails with -A option, give up and don't
continue trying to set times to current time. [1]
- Set exit status to 1 when setting of timestamps fails for a directory
or symbolic link even though lstat()/stat() would succeed.
- Don't print bogus error message when rw() succeeds.

PR: bin/112213

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.

- If lstat()/stat() fails with an error other than ENOENT, don't ignore
the error and assume that the file doesn't exist. Touch could return
success with -c option even if the file existed and time was not set.
- If the first utimes_f() call fails with -A option, give up and don't
continue trying to set times to current time. [1]
- Set exit status to 1 when setting of timestamps fails for a directory
or symbolic link even though lstat()/stat() would succeed.
- Don't print bogus error message when rw() succeeds.

PR: bin/112213
Submitted by: jilles [1]
Reviewed by: jilles
Approved by: trasz (mentor)

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

Usage: print base name of program.

-A flag: respect the -a and -m flags.
imply the -c flag.

Requested in principle by: brian

Add -A flag to adjust existing time stamps.
Print name by which program was started in usage() message.

MFC after: 2 weeks

Don't set time to current, if set to specific time fails

PR: 92577

ANSIify function definitions.
Add some constness to avoid some warnings.
Remove use register keyword.
Deal with missing/unneeded extern/prototypes.
Some minor type changes/casts to avoid warnings.

Reviewed by: md5

Replace various spelling with FALLTHROUGH which is lint()able

Remove local prototypes for main().

Handle directories correctly.

PR: 40801
MFC after: 5 days

remove __P

WARNS=2 is going to be the default, so don't specify it. Use __FBSDID().

blah, remove debugging code that crept in with last commit.

Add the 'h' flag to operate on symlinks rather than what they point to.

Fix some trivial warnings and clamp down with WARNS=2

MFC after: 1 week

Clean up some ambiguous nested if/elses.

Brucify.

Sync usage() with man page.

PR: 11539
Submitted by: Ruslan Ermilov <ru@ucb.crimea.ua>

Merge from 2_2 man page change.

PR: 9323
Submitted by: ishisone@sra.co.jp
Make touch handle years 2000-2038 in the obsoleted format, rather
than 1902-1969 as was previously the case with two digit year spec.

Don't assume that time_t is long.

Finish importing Lite2's src/usr.bin, except for ex, diff, grep, mail,
pascal and vmstat.sparc. All changed files on the vendor branch should
already have been imported.

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

Don't use __dead or __pure in user code. They were obfuscations
for gcc >= 2.5 and no-ops for gcc >= 2.6. Converted to use __dead2
or __pure2 where it wasn't already done, except in math.h where use
of __pure was mostly wrong.

PR # bin/274
> The command:
>
> touch -t 199504011200 testfile
>
> gives the error message:
>
> touch: out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]

Submitted by: mpp@legarto.minn.net (Mike Pritchard)

Remove trailing whitespace.

BSD 4.4 Lite Usr.bin Sources