Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

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

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

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.

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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