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: Update copyright text to match current templates.

setproctitle_internal(): remove kbuf local, it is write-only

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Drop temporary compat in setproctitle

Save on getpid in setproctitle by supporting -1 as curproc.

Attempt to use AT_PS_STRINGS to get the ps_strings pointer.

This saves a system call and avoids one of the (relatively rare) cases
of the kernel exporting pointers via sysctl.

As a temporary measure, keep the sysctl support to allow limited
compatability with old kernels.

Fail gracefully if ps_strings can't be found (should never happen).

Reviewed by: kib
Obtained from: CheriBSD
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D24407

Fix style nits.

Add setproctitle_fast(3) for frequent callers.

Some applications, notably PostgreSQL, want to call setproctitle()
very often. It's slow. Provide an alternative cheap way of updating
process titles without making any syscalls, instead requiring other
processes (top, ps etc) to do a bit more work to retrieve the data.
This uses a pre-existing code path inherited from ancient BSD, which
always did it that way.

Submitted by: Thomas Munro
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D16111

remove unnecessary vm includes from setproctitle

vm headers were needed only for the PS_STRINGS fallback, which was
removed in r297888.

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

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).

Remove PS_STRINGS fallback from setproctitle

In r103767 the kern.ps_strings sysctl was added as the preferred way to
locate the ps_strings struct and is available in any FreeBSD release
supported within the last decade.

Reviewed by: kib

Remove code to support the top of the stack layout for FreeBSD 1.x/2.x
kernel, but keep explanation of the old ps_strings structure to make
it clear what sanity check tries to accomplish.

Noted by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

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

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.

Don't segfault if setproctitle(3) is called with NULL initially.
The old buffer was not being initialized and a later str*() op on
it would cause a crash if it wasn't initialized by a previous
call to setproctitle(3) with an actual string.

Noticed by: Ashley Penney <ashp@unloved.org>

Reduce libc's memory footprint by lazily allocating memory used internally
by setproctitle().

Reviewed by: jkh

Do not use __progname directly (except in [gs]etprogname(3)).
Also, make an internal _getprogname() that is used only inside
libc. For libc, getprogname(3) is a weak symbol in case a
function of the same name is defined in userland.

Fix SCM ID's.

When recording the original arguments, stop short if we encounter
a NULL argument. Some programs change the contents of the argv
array, typically to remove some special arguments. They shorten
argv by storing a NULL where an argument pointer used to be. Such
programs core dumped if they called setproctitle(), because it
would try to apply strlen() to a NULL pointer.

When recording the original arguments, don't (ab)use "nargc" for
iterating over the arguments. Doing so wipes out the value which
is about to be stored into the ps_strings structure.

If the format string passed to setproctitle begins with a '-'
character, skip the program name when setting the process title.
Ansified with extreme prejudice.

Reviewed by: peter

Make setproctitle(NULL) restore all of the original arguments
(if it's able).

Introduce commandline caching in the kernel.

This fixes some nasty procfs problems for SMP, makes ps(1) run much faster,
and makes ps(1) even less dependent on /proc which will aid chroot and
jails alike.

To disable this facility and revert to previous behaviour:
sysctl -w kern.ps_arg_cache_limit=0

For full details see the current@FreeBSD.org mail-archives.

$Id$ -> $FreeBSD$

Adjust for kern.ps_strings and PS_STRINGS not being a pointer. This is
an unimprovement here. I thought it would be an improvement, as in libkvm,
but here we can access the strings directly.

Use sysctlbyname() instead of sysctl() and trust it to give a nonzero
address if it succeeds.

Oops, revert part of a diff that wasn't supposed to have been committed.

Cache the results of the ps_strings sysctl so that it doesn't have to be
redone for every call of setproctitle().

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.

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

If the two recently added sysctl variables exist, use those rather than
the statically compiled PS_STRINGS and USRSTACK variables. This prevents
programs using setproctitle from coredumping if the kernel VM is increased,
and stops libkvm users (w, ps, etc) from needing to be recompiled if only
the VM layout changes.

Bring in an initial version of setproctitle().. This is intended to
replace the dozen other various hacks in the code that do all sorts
of crude things including spamming the envrionment strings with the new
argv string.

This version is mainly inspired by the sendmail version, with a couple of
ideas taken from the NetBSD implementation as well.