Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

make sure that rbuf is aligned by making a union w/ the structure we
need to access... access the struct through the union too...

PR: 185165
Submitted by: Guy Yur
MFC after: 1 week

Fix socket calls on error post-r243965.

Submitted by: Garrett Cooper

Include sys/socket.h to know about sa_family_t.

Make this compile with GCC4 by fixing a few signedness related warnings.

Reviewed by: md5(1)

Prefer C99's __func__ over GCC's __FUNCTION__.

- Added three new interfaces, NgAllocRecvMsg(), NgAllocRecvAsciiMsg(),
and NgAllocRecvData(), that dynamically allocate buffer for a binary
message, an ascii message, and a data packet, respectively. The size
of the allocated buffer is equal to the socket's receive buffer size
to guarantee that a message or a data packet is not truncated.

- Get rid of the static size buffer in NgSendAsciiMsg().

OK'ed by: archie, julian

Use the new defines that include the trailing '\0' in the code.
Replace occurences of the magic constant 2 with an offsetof macro
call that computes the size of the leading members of the sockaddr.
Use strlcpy instead of sprintf where appropriate. Document the new changes
in the man page.

Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup,
especially in troff files.

Add __FBSDID()s to libnetgraph

Have NgMkSockNode() load the socket node type KLD if it's not
already loaded (indicated by EPROTONOSUPPORT from socket(2)).

Whistle's Netgraph link-layer (sometimes more) networking infrastructure.
Been in production for 3 years now. Gives Instant Frame relay to if_sr
and if_ar drivers, and PPPOE support soon. See:
ftp://ftp.whistle.com/pub/archie/netgraph/index.html
for on-line manual pages.

Reviewed by: Doug Rabson (dfr@freebsd.org)
Obtained from: Whistle CVS tree