The nscd database mapped in processes can change at any time. We
have to be more vigilant when it comes to using that memory. Test
the data entries are valid in their entire size, don't read data
again from memory once we verified it, and make sure the trailing
pointer is not going off the deep end.
* nscd/nscd_getai.c (__nscd_getai): Set errno to 0 in case we found
no entry.
* nscd/nscd_getgr.c (nscd_getgr_r): Likewise.
* nscd/nscd_gethst_r.c (nscd_gethst_r): Likewise.
* nscd/nscd_getpw_r.c (nscd_getpw_r): Likewise.
* nscd/nscd_getserv_r.c (nscd_getserv_r): Likewise.
from return value.
* nscd/nscd_helper.c: Include string.h.
(__nscd_cache_search): Remove const qualifier from return value.
On strict alignment architectures check hash entry and data head
alignment.
* nscd/nscd_getpw_r.c (nscd_getpw_r): Don't crash or fail because
mmapped data during GC cycle contains garbage. If
__nscd_drop_map_ref fails, decrement mapped->counter when returning
error or if retrying with NO_MAPPING, only __nscd_unmap if counter
dropped to 0.
* nscd/nscd_getgr_r.c (nscd_getgr_r): Likewise.
* nscd/nscd_initgroups.c (__nscd_getgrouplist): Likewise.
* nscd/nscd_gethst_r.c (nscd_gethst_r): Likewise.
* nscd/nscd_getai.c (__nscd_getai): Likewise.
* nscd/nscd_getserv_r.c (nscd_getserv_r): Likewise.
2007-01-31 Jakub Jelinek <jakub@redhat.com>
* nscd/nscd-client.h (__nscd_cache_search): Remove const qualifier
from return value.
* nscd/nscd_helper.c: Include string.h.
(__nscd_cache_search): Remove const qualifier from return value.
On strict alignment architectures check hash entry and data head
alignment.
* nscd/nscd_getpw_r.c (nscd_getpw_r): Don't crash or fail because
mmapped data during GC cycle contains garbage. If
__nscd_drop_map_ref fails, decrement mapped->counter when returning
error or if retrying with NO_MAPPING, only __nscd_unmap if counter
dropped to 0.
* nscd/nscd_getgr_r.c (nscd_getgr_r): Likewise.
* nscd/nscd_initgroups.c (__nscd_getgrouplist): Likewise.
* nscd/nscd_gethst_r.c (nscd_gethst_r): Likewise.
* nscd/nscd_getai.c (__nscd_getai): Likewise.
* nscd/nscd_getserv_r.c (nscd_getserv_r): Likewise.
* nscd/nscd-client.h (libc_locked_map_ptr): Add new first
parameter, used as class for definition.
* nscd/nscd_getpw_r.c: Adjust for libc_locked_map_ptr change.
(pw_map_free): Ensure no crash after memory is freed.
* nscd/nscd_getgr.c: Likewise. Make map externally visible.
* nscd/nscd_gethst.c: Likewise.
* nscd/nscd_getai.c: Use map from nscd_gethost.c.
* nscd/nscd_initgroups.c: Use map from nscd_getgr.c.
* nscd/nscd.c (termination_handler): Reset timestamp so that
client immediately stop using the database.
(__nscd_drop_map_ref): Change second parameter to be a reference to
* nscd/nscd.h: Add declaration of addinitgroups and
2004-09-30 Ulrich Drepper <drepper@redhat.com>
* nscd/nscd-client.h (__nscd_get_map_ref): Drop volatile from last
parameter.
(__nscd_drop_map_ref): Change second parameter to be a referenc to
a variable. Update variable when cycle count changed.
* nscd/nscd_helper.c (__nscd_get_map_ref): Remove volatile here, too.
* nscd/nscd_getai.c: Correctly use __nscd_drop_map_ref. Reinitialize
all variables and avoid memory leak in case of retries.
* nscd/nscd_getgr_r.c: Likewise.
* nscd/nscd_gethst_r.c: Likewise.
* nscd/nscd_getpw_r.c: Likewise.
* nscd/nscd_initgroups.c: Likewise.
* nscd/nscd.h: Add declaretion of addinitgroups and
readdinitgroups.
* nscd/connections.c: Implement r/o sharing of nscd's cache with client
processes via shared memory.
* nscd/nscd-client.h: Likewise.
* nscd/nscd.h: Likewise.
* nscd/nscd_conf.c: Likewise.
* nscd/nscd_getgr_r.c: Likewise.
* nscd/nscd_getpw_r.c: Likewise.
* nscd/nscd_gethst_r.c: Likewise.
* nscd/nscd.conf: Add new config parameters.
* nscd/Makefile (aux): Add nscd_helper.
* nscd/nscd_helper.c: New file.
* nscd/mem.c (gc): Indicate beginning and end of the gc cycle.
* nscd/hstcache.c: Simplify a lot. We cache only the request itself,
no derived information.
* connections.c (nscd_init): Fix bug in testing size of the persistent.
* nis/Makefile (aux): Add nis_hash.
* nis/nis_hash.c: New file. Split out from nis_util.c.
* nis/nis_util.c: Move __nis_hash code in separate file.
* csu/tst-atomic.c: Improve atomic_increment_val test which would
not have found a ppc bug.
2004-02-26 Ulrich Drepper <drepper@redhat.com>
* nss/getXXbyYY_r.c: Pass result also to the nscd_* function. Don't
set *result here.
* nscd/nscd_proto.h: Add new argument for pointer to result pointer
to all nscd_* functions.
* nscd/nscd_getgr_r.c (nscd_getgr_r): Add new parameter. Store result
pointer in the address provided by the new parameter if successful.
Otherwise store NULL. Return zero if no entry found.
(__nscd_getgrnam_r, __nscd_getgrgid_r): Add new parameter and pass
it on.
* nscd/nscd_gethst_r.c (nscd_gethst_r): Add new parameter. Store
result pointer in the address provided by the new parameter if
successful. Otherwise store NULL. Return zero if no entry found.
(__nscd_gethostbyname_r, __nscd_gethostbyname2_r,
__nscd_gethostbyaddr_r): Add new parameter and pass it on.
* nscd/nscd_getpw_r.c (nscd_getpw_r): Add new parameter. Store result
pointer in the address provided by the new parameter if successful.
Otherwise store NULL. Return zero if no entry found.
(__nscd_getpwnam_r, __nscd_getpwuid_r): Add new parameter and pass
it on.
2003-04-22 Ulrich Drepper <drepper@redhat.com>
* nscd/nscd-client.h: Add declaration for __nscd_open_socket.
* nscd/nscd_gethst_r.c (__nscd_open_socket): Renamed from
open_socket. Not static anymore.
(nscd_gethst_r): Use __nscd_open_socket.
* nscd/nscd_getgr_r.c (open_socket): Removed.
(nscd_getgr_r): Use __nscd_open_socket.
* nscd/nscd_getpw_r.c (open_socket): Removed.
(nscd_getpw_r): Use __nscd_open_socket.
* nscd/nscd.c (main): Change type of fdn to long int and use strtol.
* nscd/connections.c (handle_request): Add cast to avoid warning.
* nscd/nscd_getpw_r.c (nscd_getpw_r): Likewise.
* gmon/gmon.c (write_call_graph): Use u_long for FROM_LEN.
* nscd/nscd_getgr_r.c (nscd_getgr_r): Use nscd_ssize_t for CNT.
* nscd/nscd_getpw_r.c (nscd_getpw_r): Consolidate writing of the
request with one writev call. Protect all read calls with
TEMP_FAILURE_RETRY.
* nscd/nscd_getgr_r.c (nscd_getgr_r): Likewise.
* nscd/nscd_gethst_r.c (nscd_gethst_r): Likewise.
* nscd/hstcache.c: Use extend_alloca to reallocate alloca'd buffer.
Protect writev calls with TEMP_FAILURE_RETRY.
* nscd/grpcache.c: Likewise.
* nscd/pwdcache.c: Likewise.
2001-07-06 Paul Eggert <eggert@twinsun.com>
* manual/argp.texi: Remove ignored LGPL copyright notice; it's
not appropriate for documentation anyway.
* manual/libc-texinfo.sh: "Library General Public License" ->
"Lesser General Public License".
2001-07-06 Andreas Jaeger <aj@suse.de>
* All files under GPL/LGPL version 2: Place under LGPL version
2.1.
* nss/getXXbyYY_r.c: Return error code not -1.
* nss/getXXent_r.c: Likewise.
* nss/getXXbyYY.c: Expect return alue to be ERANGE if buffer is too
small.
* nscd/nscd_getgr_r.c: Return -1 in case nscd is not available and
value > 0 for error.
* nscd/nscd_gethst_r.c: Likewise.
* nscd/nscd_getpw_r.c: Likewise.
1999-06-17 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/unix/sysv/linux/bits/ioctl-types.h: Add missing line
disciplines.
1999-06-14 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* nscd/nscd_nischeck.c: Fix typos.
1999-06-17 Ulrich Drepper <drepper@cygnus.com>
1999-03-13 Mark Kettenis <kettenis@gnu.org>
* sysdeps/unix/bsd/getpt.c (__getpt): Do not use `isatty' to check
if the opened master pty really is a pty. `isatty' checks for
tty-ness and a pty is not a tty. Return ENOENT instead of ENFILE
if we are out of pty's.
1999-03-13 Mark Kettenis <kettenis@gnu.org>
* sysdeps/generic/utmp_file.c (setutent_file): Make sure the just
opened file is closed on exec.
* login/utmp_daemon.c (setutent_daemon): Likewise for the just
opened socket.
1999-03-13 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/llio.texi (File Position Primitive): Reformat @end
command. Patch by Bruno Haible <haible@ilog.fr> [PR libc/1020].
* nscd/nscd_getpw_r.c (nscd_getpw_r): Set `errno' correctly if no
entry is found.
* nscd/nscd_getgr_r.c (nscd_getgr_r): Likewise.
* nscd/nscd_gethst_r.c (nscd_gethst_r): Likewise.
* nscd/nscd_getpw_r.c (nscd_getpw_r): Mark as internal and take
extra argument with length of key string.
(__nscd_getpwnam_r): Call nscd_getpw_r with extra argument.
(__nscd_getpwuid_r): Create key string on stack.
* nscd/nscd_getgr_r.c: Mark local functions as internal.
* nscd/nscd_gethst_r.c: Likewise.
1999-01-11 Ulrich Drepper <drepper@cygnus.com>
* ctype/Versions [GLIBC_2.0]: Export __ctype32_b.
* include/wctype.h: Declare __iswctype.
* stdio-common/vfscanf.c (__vfscanf): Use __iswspace instead of
iswspace.
* wctype/Makefile (routines): Add wcextra_l.
* wctype/wcextra.c (iswblank): Implement function here and don't use
__iswctype.
(__iswblank_l): Move definition to...
* wctype/wcextra_l.c: ...here. New file.
* wctype/wcfuncs.c: Really implement functions and don't call
__iswctype or __towctrans.
* wctype/wctype.h: Change isw* and tow* macros. Don't call
__iswctype or __towctrans. Instead optimize constant argument case.
* iconv/gconv.h: Fix typos.
* iconv/skeleton.c: Fix typos. Optimize init function a bit.
Correctly emit escape sequence to return to initial state in
conversion function.
* iconvdata/iso-2022-jp.c (gconv_init): Correctly initialize
max_needed_to element.
* manual/mbyte.texi: Removed. This is now described in charset.texi.
* manual/charset.texi: New file.
* manual/Makefile (chapters): Replace mbyte by charset.
* manual/ctype.texi: Document wide character functions.
* manual/intro.texi: Fix reference to mbyte chapter.
* manual/lang.texi: Likewise.
* manual/locale.texi: Likewise.
* manual/stdio.texi: Likewise.
* manual/string.texi: Fix @node line for new charset chapter.
* manual/libc.texinfo (UPDATED): Updated. Also update copyright years.
* manual/memory.texi (savestring): Optimize code to give a good
example.
* manual/filesys.texi: Fix wording. Patches by Jim Meyering.
* nscd/nscd_getgr_r.c: Include stdint.h to get uintptr_t definition.
* nscd/nscd_getpw_r.c: Likewise.
* nscd/nscd_gethst_r.c: Likewise.
* stdlib/stdtold_l.c: Always include xlocale.h.
1999-01-11 Geoffrey Keating <geoffk@ozemail.com.au>
* stdlib/fpioconst.h (LDBL_MAX_10_EXP_LOG): Define to be same as
DBL_MAX_10_EXP_LOG if there is no long double.
(_fpioconst_pow10): Always use size as LDBL_MAX_10_EXP_LOG to match
printf_fp.c.
1999-01-10 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* timezone/Makefile ($(testdata)/GB): Changed to ...
($(testdata)/Europe/London): ... for tst-timezone test.
($(objpfx)tst-timezone.out): Change GB to Europe/London.
* timezone/tst-timezone.c (main): Enable DST switching test,
change GB to Europe/London.
1999-01-10 Philip Blundell <philb@gnu.org>
* socket/Makefile (headers): Remove bits/sockunion.h.
1999-01-09 Philip Blundell <philb@gnu.org>
* socket/sys/socket.h: Don't include <bits/sockunion.h>.
* sysdeps/generic/bits/sockunion.h: Deleted.
* sysdeps/unix/sysv/linux/bits/sockunion.h: Likewise.
1999-01-08 H.J. Lu <hjl@gnu.org>
* io/fts.c (fts_close): Don't access memory after having it freed.
1998-11-30 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* nscd/nscd_getpw_r.c: Include nscd_proto.h for prototypes.
* sysdeps/generic/errno-loc.c: Include <errno.h> for prototype,
undefine errno to get variable.
* sysdeps/unix/sysv/linux/i386/setfsuid.c: Include <sys/fsuid.h>
instead of <unistd.h> for prototype.
* sysdeps/unix/sysv/linux/i386/setfsgid.c: Likewise.
1998-11-30 Ulrich Drepper <drepper@cygnus.com>
* misc/err.h: Correct comments and use protected attribute keywords.
Reported by Joseph Myers <jsm28@cam.ac.uk>.
1998-11-29 Roland McGrath <roland@baalperazim.frob.com>
* malloc/thread-m.h [_LIBC]: Include <bits/libc-tsd.h>, and
remove tsd stuff from pthreads/cthreads libc sections.
Use __libc_tsd_define for MALLOC key.
[_LIBC] (tsd_key_t, tsd_key_create): Define to a zero-size type and a
no-op, respectively.
[_LIBC] (tsd_setspecific, tsd_getspecific): Use __libc_tsd_get/set.
* elf/dl-error.c: Include <bits/libc-tsd.h>.
Use __libc_tsd_define for DL_ERROR key.
(tsd_setspecific, tsd_getspecific): Rewritten using __libc_tsd_get/set.
* sysdeps/mach/hurd/bits/libc-tsd.h: New file.
* sysdeps/generic/bits/libc-tsd.h: New file.
* Makefile (distribute): Add bits/libc-tsd.h.
1998-10-12 Roland McGrath <roland@baalperazim.frob.com>
* elf/dl-error.c: Remove kludge to check for ld.so load address.
There is no need if weak undefined symbols are not used in ld.so;
see linuxthreads/ChangeLog for changes to files
linuxthreads/sysdeps/pthread/bits/libc-lock.h and
linuxthreads/sysdeps/pthread/bits/libc-tsd.h.
1998-11-30 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/i386/bits/string.h (__memset_cc): Fix typo (s->__s).
* sysdeps/i386/i486/bits/string.h: Add prototypes for all new
inline functions.
* sysdeps/i386/bits/string.h: Likewise.
1998-11-30 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/unix/sysv/linux/alpha/bits/ipc.h: Remove ipc_kludge.
1998-11-30 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* db2/progs/db_load/db_load.c (main): Avoid -Wparentheses warning.
* nscd/nscd-client.h: New file, broken out of "nscd.h".
* nscd/nscd.h: Move defns needed by clients to "nscd-client.h",
and #include that.
* nscd/Makefile (distribute): Add nscd-client.h.
* nscd/nscd_getgr_r.c, nscd/nscd_gethst_r.c, nscd/nscd_getpw_r.c:
Include "nscd-client.h" instead of "nscd.h"
1998-10-18 Ulrich Drepper <drepper@cygnus.com>
* resolv/nss_dns/dns-host.c: Add missing errnop parameter to the
NSS functions.
* resolv/nss_dns/dns-network.c: Likewise.
* grp/Makefile: Don't search for linuxhtreads in add-ons, use
have-thread-library to determine whether threads are available.
* pwd/Makefile: Remove wrong comment.
* inet/Makefile: Define CFLAGS-gethstbyad_r.c, CFLAGS-gethstbynm_r.c,
and CFLAGS-gethstbynm2_r.c to -DUSE_NSCD=1.
* locale/C-messages.c: Define default strings for YESTR and NOSTR.
* nss/Versions: Add __nss_hosts_lookup.
* nss/getXXbyYY.c: Remove unneeded assignment.
* nss/getXXbyYY_r.c: Include nscd/nscd_proto.h only if needed.
Almost complete rewrite of the NSCD to make it smaller, faster,
add more functionnality and make it easier to extend.
* nscd/Makfile (routines): Add nscd_gethst_r.
(nscd-modules): Add hstcache, gethstbyad_r, gethstbynm2_r, and cache.
* nscd/cache.c: New file.
* nscd/gethstbyad_r.c: New file.
* nscd/gethstbynm2_r.c: New file.
* nscd/hstcache.c: New file.
* nscd/nscd_gethst_r.c: New file.
* nscd/connections.c: Rewritten. Don't start new thread for every
new connection. Use a fixed set of threads which handle all
connections and also the cache cleanup.
* nscd/grpcache.c: Rewritten to use generic cache handling functions
in cache.c.
* nscd/nscd.c: Recognize new parameter nthreads. Adjust initialization
for rewrite. Remove handle_requests function.
* nscd/nscd.h (NSCD_VERSION): Bump to 2.
Define new data structure for the new unified cache and the host
database entries.
* nscd/nscd_conf.c: Rewrite parsing partly to allow adding of more
databases easily. Recognize check-files and threads definitions.
* nscd/nscd.conf: Add definition of enable-cache and check-files to
passwd and group definitions. Add new set of definitions for hosts.
* nscd/nscd_getgr_r.c: Rewrite for new protocol.
* nscd/nscd_getpw_r.c: Likewise.
* nscd/nscd_proto.h: Add prototype for host database functions.
* nscd/nscd_stat.c: Rewrite to simplify printing of information
for many databases.
* nscd/dbg_log.c: Remove unnecessary variable initializations.
Global variable debug_flag is renamed to dbg_level.
* nscd/dbg_log.h: Declare set_logfile.
1998-04-08 Ulrich Drepper <drepper@cygnus.com>
* login/utmp_file.c: use __ftruncate not ftruncate.
* sysdeps/unix/common/syscalls.list: Add __ftruncate as real name
for system call and make ftruncate weak alias.
* posix/unistd.h: Add prototype for __ftruncate.
* login/utmp_daemon.c (open_socket): Use __socket not socket.
* nscd/nscd_getpw_r.c (__nscd_getpw_r): use __snprintf and __readv
instead of snprintf and readv.
* nscd/nscd_getgr_r.c (__nscd_getgr_r): Use __snprintf not
snprintf.
* stdlib/strtod.c: Call strtoull/wcstoull's internal functions
directly.
1998-03-06 11:35 Ulrich Drepper <drepper@cygnus.com>
* posix/wordexp-test.c: Change testsuite so that it can run even
for ~root != /root.
1998-03-06 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* math/libm-test.c (catanh_test): Change epsilon for gcc 2.8.1.
1998-03-05 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/i386/sysdep.h (SYSCALL_ERROR_HANDLER):
Don't store into global errno if we already store through
__errno_location.
* sysdeps/unix/i386/sysdep.S: Likewise.
* sysdeps/unix/alpha/sysdep.S: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/brk.S: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/clone.S: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h: Likewise. Add
missing return to SYSCALL_ERROR_HANDLER for (!_LIBC_REENTRANT &&
PIC).
1998-03-05 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/generic/sysdep.h (L): Remove definition.
* sysdeps/i386/sysdep.h (L): Define it here instead.
1998-03-05 Thorsten Kukuk <kukuk@vt.uni-paderborn.de>
* nss/getXXbyYY_r.c: Check __nss_not_use_nscd_* variable for
running nscd.
* nscd/nscd_getgr_r.c: Set __nss_not_use_nscd_group variable.
* nscd/nscd_getpw_r.c: Set __nss_not_use_nscd_passwd variable.
* nscd/nscd_proto.h: Declare __nss_not_use_nscd_* variables.
1998-03-05 Ulrich Drepper <drepper@cygnus.com>
* elf/rtld.c: Speed up processing of environment variables. Do
only one run on the environment by avoiding to call getenv.
* sysdeps/generic/dl-sysdep.c (_dl_next_ld_env_entry): New
function. Used by patch above.
1998-03-05 10:25 Ulrich Drepper <drepper@cygnus.com>
* nss/getXXbyYY_r.c: Don't try to contact nscd every time when it
failed. Only do this every NSS_NSCD_RETRY times.
* nss/nsswitch.c: Define __nss_nscd_not_available, used by above
change.
* nscd/nscd_getgr_r.c (__nscd_getgr_r): Return 2 if contacting the
daemon failed.
* nscd/nscd_getpw_r.c (__nscd_getpw_r): Likewise.
1998-03-05 Ulrich Drepper <drepper@cygnus.com>
* nss/nsswitch.c (nss_lookup_function): Don't modify errno if NSS
module cannot be found. Reported by Andreas Jaeger.
1998-03-05 11:40 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
* nscd/nscd_getgr_r.c: Change char to int to avoid compiler warning
on platforms which default to unsigned chars.
* nscd/nscd_getpw_r.c: Likewise.
* sysdeps/unix/sysv/linux/powerpc/sysdep.h: Undefine L before
defining it.
1998-03-05 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* elf/Makefile (install-bin): Change = to += for sprof to install
ldd also.
1998-01-31 Phil Blundell <philb@gnu.org>
* configure.in: Add --without-cvs option to suppress automatic
checkin of regenerated files.
* config.make: Likewise.
* Makefile: Respect with-cvs setting.
* Makerules: Likewise.
* configure.in: Allow the standalone ARM port to be configured.
1998-01-31 Thorsten Kukuk <kukuk@vt.uni-paderborn.de>
* grp/getgrgid_r.c: Define USE_NSCD.
* grp/getgrnam_r.c: Likewise.
* pwd/getpwuid_r.c: Likewise.
* pwd/getpwnam_r.c: Likewise.
* sysdeps/unix/inet/Subdirs: Add nscd subdir.
* nss/getXXbyYY_r.c: Try at first nscd.
* nscd/Makefile: New, for the Name Switch Cache Daemon (nscd).
* nscd/connections.c: New file.
* nscd/dbg_log.c: New file.
* nscd/dbg_log.h: New file.
* nscd/grpcache.c: New file.
* nscd/nscd.c: New file.
* nscd/nscd.h: New file.
* nscd/nscd_conf.c: New file.
* nscd/nscd_stat.c: New file.
* nscd/pwdcache.c: New file.
* nscd/nscd_getgr_r.c: New, client code, linked into libc.
* nscd/nscd_getpw_r.c: Likewise.
* nscd/nscd_proto.h: New, prototypes for client functions.
* nscd/nscd.conf: New, example for a configuration file.
* nscd/nscd.init: New, example for a startup script.
* nscd/getgrgid_r.c: Old grp/getgrgid_r version, used from nscd to
avoid deadlocks.
* nscd/getgrnam_r.c: Likewise.
* nscd/getpwnam_r.c: Likewise.
* nscd/getpwuid_r.c: Likewise.
* nis/nis_cache.c: New file.
* nis/nis_cache2.h: New file.
* nis/nis_cache2_xdr.c: New file.
