okay guenther@

Provide a declaration for userspace
Fix the kernel's sanity check on the buflen argument
lack of prototype pointed out by sthen@ and landry@
ok kettenis@ otto@

<sys/_types.h> for the internal types
ok matthew@

(ie. non-kernel) .h file

int (*)(struct dirent *)
to
int (*)(const struct dirent *)
to match POSIX.
ok millert@, ports check by naddy@

requests the pre-standardized version
requested by millert@

typedef regardless of __BSD_VISIBLE, and eliminate the dirfd() macro.
ok guenther@

use "const struct dirent **" instead of "const void *".  Also, add
__restrict to readdir_r().
ok matthew@

to be pruned later when DIR is made an opaque type.
ok guenther@; prodding by brad@ for VLC and other ports

fchmodat(2), fstatat(2), mkdirat(2), mkfifoat(2), mknodat(2),
faccessat(2), fchownat(2), linkat(2), readlinkat(2), renameat(2),
symlinkat(2), unlinkat(2), utimensat(2), futimens(2), and
fdopendir(3).
"Minor" libc bump.
Tested in a bulk build by naddy@
Much help from guenther@, thib@, tedu@, oga@, and others.
ok deraadt@, naddy@

dd_flags is renamed to the placeholder position dd_unused so that
we can spot "broken software" which assumes we have Jan Simon Pendry's
union mounts (we don't have them, and won't have them ever again).
__opendir2 question spotted by matthew
verified to not break ports by sthen

of NULL was incorrect for c++ compilers that aren't
gcc (or pretend to be gcc like clang).
ok miod@

Kernel and bootblocks still use the old 0L value until all the NULL abuses
in the code are fixed.

with POSIX 2008
ok millert@

so it works correctly with large offsets (and matches other systems).
This requires adding a new getdirentries syscall, with the old one
renamed to ogetdirentries.  All in-tree consumers of getdirentries()
have been updated.  Bump libc and libpthread major numbers.
OK and with deraadt@

isolate its usage to libpthread only and replace with generic non-static
mutex support in the one place it is needed:
- remove _FD_LOCK/UNLOCK from lseek and ftruncate in libc and make the
functions weak so that libpthread can override with its own new
versions that do the locking.
- remove _thread_fd_lock/unlock() weak functions from libc and adjust
libpthread for the change.
- add generic _thread_mutex_lock/unlock/destroy() weak functions in libc
to support non-static mutexes in libc and add libpthread and librthread
implementations for them. libc can utilize non-static mutexes via the
new _MUTEX_LOCK/UNLOCK/DESTROY() macros. Actually these new macros can
support both static and non-static mutexes but currently only using
them for non-static.
- make opendir/closedir/readdir/readdir_r/seekdir/telldir() thread-safe
for both thread libraries by using a non-static mutex in the struct
_dirdesc (typedef DIR), utilizing it in the *dir functions and remove
remaining and incorrect _FD_LOCK/UNLOCK() use in libc.
- add comments to both thread libraries to indicate libc depends on the
current implementation of static mutex initialization. suggested by
marc@
- major bump libc and libpthread due to function removal, structure
change and weak symbol conversions.
okay marc@, tedu@

is never set now that the unionfs support has been removed from
readdir().  OK pedro@

- Fix semantics: seekdir(pos); telldir() shoud return pos. The code
that implements this will be made faster in a later commit.
- We loose documented behaviour (after closedir() the telldir()
positions are not valid anymore). This was never in Posix, and most
other systems have nothing like it.
Diff originally from Paul Thorn, rewritten by me using some FreeBSD
code.  "slap it in" deraadt@

in sys/cdefs.h) instead of _FOO_SOURCE.  Also fix several namespace
pollution issues, including the byte order defines.  OK deraadt@

ok deraadt@

You must have an up-to-date gcc for this!
deraadt@ ok

rescinded 22 July 1999.  Proofed by myself and Theo.

OK mickey@ and discussed with deraadt@

__null is a magic constant of integral type that converts to a null pointer
as should be, but warns for ambiguity when used to resolved an overload
between an integral type and a pointer type.

All POSIX libc api now there (to P1003.1c/D10)
(more md stuff is needed for other libc/arch/*)
(setlogin is no longer a special syscall)
Add -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS).
Doc some re-entrant routines
Add libc_r to intro(3)
dig() uses some libc srcs and an extra -I was needed there.
Add more md stuff to libc_r.
Update includes for the pthreads api
Update libc_r TODO

entire trees for testing anyway, I might as well do this intrusive touching
of include files now.  Added openBSD tags.