Add __returns_twice for the attribute of the same name. This makes the
attribute explicit based on the functions GCC gives it too.

Allow <machine/setjmp.h> to override the type using in jmpbuf.

change some __attribute__s to __keywords

compat code reorg

Add no-return attribute to all longjmp flavors. Approved by kleink.

de-__P -- the hack is long since useless. Discussed with christos,
matt, kleink, others. Approved by christos.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22270, verified by myself.

Add a new feature-test macro, _NETBSD_SOURCE. If this is defined
by the application, all NetBSD interfaces are made visible, even
if some other feature-test macro (like _POSIX_C_SOURCE) is defined.

Add a new feature-test macro, _NETBSD_SOURCE. If this is defined
by the application, all NetBSD interfaces are made visible, even
if some other feature-test macro (like _POSIX_C_SOURCE) is defined.
<sys/featuretest.h> defined _NETBSD_SOURCE if none of _ANSI_SOURCE,
_POSIX_C_SOURCE and _XOPEN_SOURCE is defined, so as to preserve
existing behaviour.

This has two major advantages:
+ Programs that require non-POSIX facilities but define _POSIX_C_SOURCE
can trivially be overruled by putting -D_NETBSD_SOURCE in their CFLAGS.
+ It makes most of the #ifs simpler, in that they're all now ORs of the
various macros, rather than having checks for (!defined(_ANSI_SOURCE) ||
!defined(_POSIX_C_SOURCE) || !defined(_XOPEN_SOURCE)) all over the place.

I've tried not to change the semantics of the headers in any case where
_NETBSD_SOURCE wasn't defined, but there were some places where the
current semantics were clearly mad, and retaining them was harder than
correcting them. In particular, I've mostly normalised things so that
_ANSI_SOURCE gets you the smallest set of stuff, then _POSIX_C_SOURCE,
_XOPEN_SOURCE and _NETBSD_SOURCE in that order.

Tested by building for vax, encouraged by thorpej, and uncontested in
tech-userlevel for a week.

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make the #ifdef __LIBC12_SOURCE__ consistent with usage in <signal.h>
and <sys/stat.h>
Fixes misc/6520.

Avoid introducing new prefix '__JB' -- '_JB' is fine.

Remove bogus RCS Id.

Allow MD setjmp.h to specify attributes for jmp_buf, so more
stringent alignment requirements can be satisfied.

Fix typo in previous, and also don't version _setjmp/_longjmp; after
more careful analysis, I realized that they don't access the extended
jmp_buf data area, and thus would not have changed.

Version setjmp(), longjmp(), _setjmp(), _longjmp(), sigsetjmp(), and
siglongjmp(). The size of struct sigcontext, and thus the size
of jmp_buf and sigjmp_buf on some platforms, has changed.

Reorganize name space protection.

*jmp_buf -> arrays of longs, and make the definition of _JBLEN mach. dep.
header-dependent.

Kill warnings about sigsetjmp() and siglongjmp() being missing.

new RCS ID format.

update all but ctype.h, dumprestore.h, time.h to 4.4-Lite versions.
USL copyright additions on those. Kill varargs.h, because it can simply
be a link to the machine-dependent version.

Add defined(mc68000) || defined(__mc68000__) to the hp300 define for
_JBLEN. This will aid the integration of the five or so m68k ports,
I should think.

Remove warnings wrt. sigsetjmp() && siglongjmp(), now that there is
an implementation for one of the ports. Other-port people need to
provide this for their ports. I have a program that tests the
s

Remove warnings wrt. sigsetjmp() && siglongjmp(), now that there is
an implementation for one of the ports. Other-port people need to
provide this for their ports. I have a program that tests the
setjmp/longjmp family of routines rather thouroughly it is needed.

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_JBLEN is 9 on the sparc; I think.

kill typo. you check if things are "defined", not "defgined". 8-)

addition of the pc532 architecture

Add RCS identifiers.