Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Clean up compilation warnings. Set WARNS=6 in Makefile.

PR: 71659
Submitted by: Dan Lukes <dan obluda cz>

Remove unused variable.

Move common credential save and restore code into a separate file.
Improve credential handling in pt_file.c

Per letter dated July 22, 1999 remove 3rd clause of Berkeley derived software
(with permission of addtional copyright holders where appropriate)

The file pt_tcplisten.c lacks the $FreeBSD$ keyword. Use the opportunity to
change all files to __FBSDID.

Approved by: das (mentor)

$Id$ -> $FreeBSD$

Correct use of .Nm. Spelling. Add rcsid and remove unused #includes.

Merge from Lite2 (use new getvfsbyname() and mount(2) interface)

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Bugfixes :

- in mount_portal.c: included catching of SIGHUP to get portald to
re-read the config file.

- in mount_portal.c: in SIGCHLD handler the return values checked from
waitpid were wrong. Note. this routine was written correclty according
to the manual page for 4.4BSD, but waitpid does not exhibit this
behaviour. It is not returning 0 when WNOHANG is specified. I havent
checked this properly.

- in mount_portal.c: initialized the fdset for the select properly.

- in mount_portal.c: corrected poor casting in the select.

- in mount_portal.c: changed a break; to exit (0); so that the
children die after doing the hard work, this stops the select: bad
file descriptor messages.

- in pt_file.c: the kernel passes kernel style open flags to the
portal code which aren't compatible with "normal" O_ flags. I have
adjusted these in pt_file.c. In general I think the portal fs code
and portal_cred structure need changing to pass to the portald
the right style of flags _and_ the permissions.

- in pt_tcp.c: a few mistakes in typing of the socket structures,
getservbyname returns the port number as an int but sockaddr wants
the port number as an u_short.

- in pt_tcp.c: someone wrote this on a VAX/Sun whatever and forget
about byte ordering!! I've included a few htons about the place.

- in all the above I have sprinkled a few more debugging printf's.

Submitted by: "Duncan McL Barclay" <dmlb@ohm.york.ac.uk

bugfix: change gidset[] type from int to gid_t

BSD 4.4 Lite sbin Sources

Note: XNSrouted and routed NOT imported here, they shall be imported with
usr.sbin.