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

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

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

Move unistd.h includes to individual .c files and remove unnecessary
includes.

ANSIfy function prototypes. While I am there, constify some parameters and
make use of C99 sparse initialization for static variables, this makes talk(1)
to compile cleanly with WARNS=6.

Remove local prototypes for main().

Clear local screen when ^D is typed.
Use setproctitle to remove arguments from 'ps' output.

MFC after: 3 days

remove __P

WARNS=2 fixes with NO_WERROR set because of system-header originating
warnings. Use __FBSDID().

$Id$ -> $FreeBSD$

Add rcsid. Remove unused #includes (what about RU# ?). Change exit(-1) and
add usage().

Make talk automagically find out the interface IP address where the
remote peer will be connected through. This avoids the ``Checking for
invitation on caller's machine'' problem for multi-homed hosts.

Thanks to: Garrett, for his `find_interface' example

Add setlocale LC_CTYPE

Remove trailing whitespace.

Add check for writeable terminal
Submitted by: mark@grondar.za (and slightly modified)

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

BSD 4.4 Lite Usr.bin Sources