libc: Annotate a couple of local functions as such

No functional change intended.

MFC after: 1 week

lib: 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

libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

libc/net/getservent.c: Mark write-only variables as unused

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Fix -Wvoid-pointer-to-enum-cast warnings.

This pattern is used in callbacks with void * data arguments and seems
both relatively uncommon and relatively harmless. Silence the warning
by casting through uintptr_t.

This warning is on by default in Clang 11.

Reviewed by: arichardson
Obtained from: CheriBSD (partial)
MFC after: 1 week
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D24425

Increase YPMAXRECORD to 16M to be compatible with Linux.

Since YP protocol definition uses the constant to declare
variable-size opaque byte strings, the change should be binary
compatible with existing installations which do not expose keys or
values larger than 1024 bytes.

All uses of local variables with YPMAXRECORD sizes were removed to
avoid insane stack use. On the other hand, variables with static
lifetime should be fine and only result in increased VA use.

Glibc made same change, increasing the allowed length for keys and
values in YP to 16M, in 2013.

Reviewed by: markj
Discussed with: ian
Sponsored by: Mellanox Technologies
MFC after: 3 weeks
Differential revision: https://reviews.freebsd.org/D20900

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

libc: do not include <sys/types.h> where <sys/param.h> was already included

According to style(9):
> normally, include <sys/types.h> OR <sys/param.h>, but not both.
(<sys/param.h> already includes <sys/types.h> when LOCORE is not defined).

libc: cleanup unnecessary semicolons.

Found with devel/coccinelle.

libc: replace 0 with NULL for pointers.

While here also cleanup some surrounding code; particularly
drop some malloc() casts.

Found with devel/coccinelle.

Reviewed by: bde (previous version - all new bugs are mine)

Use ANSI C prototypes. Eliminates -Wold-style-definition warnings.

libc: Make various internal file descriptors from fopen() close-on-exec.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

MFC r206155, r206267: Add capability to use a db version of
services. It is enabled by specifying `db' as source of
services in /etc/nsswitch.conf.

MFC ir206152, r206153, r206154:
- Stop adding trailing '\n'. The servent_unpack() doesn't expect
lines terminated with '\n'.
- Treat '+' as special only when in compat mode, and simplify
the logic bit.
- Reduce duplicate code.

Use the stored length value instead of calculating it by strlen().

Add capability to use a db version of services. It is enabled by
specifying `db' as source of service in /etc/nsswitch.conf.

MFC after: 2 weeks

Reduce duplicate code.

MFC after: 2 weeks

Treat '+' as special only when in compat mode, and simplify
the logic bit.

MFC after: 2 weeks

Stop adding trailing '\n'. The servent_unpack() doesn't expect
lines terminated with '\n'.

MFC after: 2 weeks

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.

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

Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.

- Extend the nsswitch to support Services, Protocols and Rpc
databases.
- Make nsswitch support caching.

Submitted by: Michael Bushkov <bushman__at__rsu.ru>
Sponsored by: Google Summer of Code 2005

- make reentrant version of netdb functions glibc style API, and
expose them to outside of libc.
- make netdb functions NSS friendly.

Reviewed by: arch@ and current@ (no objection)

Include <sys/types.h> and <limits.h> ourselves, don't assume they are included
through <pthread.h>.

gen/sem.c: Prerequisite for <_semaphore.h>
net/getprotoent.c: USHRT_MAX
net/getservent.c: USHRT_MAX
stdio/ungetwc.c: MB_LEN_MAX
stdio/vfwscanf.c: MB_LEN_MAX

make getnetby*() thread-safe.

rename the NIS related fields to have yp_ prefix.

Suggested by: delphij

Do not check whether a pointer is NULL, since free(3) already takes care of
this case.

Reviewed by: ume

Fix build for !YP case.

BTW. Shall we change these fields to have yp_ prefix? That will make the
code easier to read.

libc-internal interfaces should have two underscores in front
of their names.

Pointed out by: das

- add getserv{byname,byport,ent}_r for internal use within libc.
- make getserv{byname,byport,ent} thread-safe.

Reviewed by: gnn

Don't ignore the last line of config file (/etc/hosts, /etc/services, etc)
which doesn't end in \n, since it may be very confusing. Also this should
increase consistency, since most other config files work just fine regardless
of the presence of traling \n in the last line.

MFC After: 2 weeks

Eliminate 19 warnings in libc (at level WARNS=2) of the
`implicit declaration of function' variety.

Remove __P() usage.

Remove 'register' keyword.

Remove trailing characters from #endif.
Actually this #endif is not needed, so remove leading characters also.

o Move NTOHL() and associated macros into <sys/param.h>. These are
deprecated in favor of the POSIX-defined lowercase variants.
o Change all occurrences of NTOHL() and associated marcros in the
source tree to use the lowercase function variants.
o Add missing license bits to sparc64's <machine/endian.h>.
Approved by: jake
o Clean up <machine/endian.h> files.
o Remove unused __uint16_swap_uint32() from i386's <machine/endian.h>.
o Remove prototypes for non-existent bswapXX() functions.
o Include <machine/endian.h> in <arpa/inet.h> to define the
POSIX-required ntohl() family of functions.
o Do similar things to expose the ntohl() family in libstand, <netinet/in.h>,
and <sys/param.h>.
o Prepend underscores to the ntohl() family to help deal with
complexities associated with having MD (asm and inline) versions, and
having to prevent exposure of these functions in other headers that
happen to make use of endian-specific defines.
o Create weak aliases to the canonical function name to help deal with
third-party software forgetting to include an appropriate header.
o Remove some now unneeded pollution from <sys/types.h>.
o Add missing <arpa/inet.h> includes in userland.

Tested on: alpha, i386
Reviewed by: bde, jake, tmm

Small yet significant tweaks/cleanups:

- getservent:
o put _yp_check() proto under #ifdef YP where it belongs
o local YP buffers should be YPMAXRECORD + 2 bytes long and should
be NUL terminated after copying

- gethostbynis:
o local YP buffer should be YPMAXRECORD + 2 bytes long

- getnetbynis:
o local YP buffer should be YPMAXRECORD + 2 bytes long and should
be NUL terminated after copying

- ether_addr:
o local YP buffers should be YPMAXRECORD + 2 bytes long and should
be NUL terminated after copying (in this case it's BUFSIZ + 2 bytes,
but it happens that BUFSIZ == YPMAXRECORD.

- gethostbydns:
o nuke stray 'return(NULL)' in __dns_getanswer() (harmless but looks silly)

These are 2.2 candidates. I will wait a few days to make sure these don't
break anything and then, if there are no objections, move them to the 2.2
branch.

Eliminate 3 more examples of gratutiously passing arrays by address.

Everyone please call ParaSoft today and say "I will buy 57 copies of
Insure++ tomorrow, but first I want a FreeBSD version." :-)

General -Wall warning cleanup, part I.
Submitted-By: Kent Vander Velden <graphix@iastate.edu>

Improve NIS performace of getservbyname() and getservbyport(). Both these
functions are implimented as wrappers around getservent(), which means it's
up to getservent() to do all the work. The NIS support in getservent()
only allows it to scan through the services.byname map one entry at a
time until it finds the requested service name/port. This can be painfully
slow due to the overhead involved (lots and lots of successive RPCs).

To fix this, we allow getservbyname() and getservbyport() to signal
getservent() that if NIS is turned on (there's a '+' in /etc/services),
the usual yp_first()/yp_next() linear search should be abandoned and
yp_match() used instead. This causes getservent() to immediately
locate the requested entry instead of wasting time groping through the
whole map.

The downside is that this trick is accomplished by exporting a couple of
pointers from getservent.c which getservbyname.c and getservbyport.c can
preset in order to tell getservent() what to do. If all three functions
were in the same source module, then the extra cruft could be delcared
static to avoid poluting the global symbol space. Maybe they should be
combined anyway. For now I've settled on prepending lots of underscores.

Getpwent() and getservent() can wind up calling free() with
an invalid pointer if a call to yp_first() fails. Closes PR # 964,
and possibly # 952.

Add NIS support to getservent(3) functions (getservbyport() and getservbyname()
both call getservent() to do most of the work, so we only need to modify
this file to take care of everybody).

Note that there is only one NIS services map (services.byname) even
though there are getservbyname() and getservbyport() library functions.

BSD 4.4 Lite Lib Sources