Reenable nss_db with a completely new implementation

No longer is Berkeley db used.  Instead a simple hash function is used.
The database files are not updated once they are created and therefore
no complicated database is needed.

6 files changed, 309 insertions, 1138 deletions

diff --git a/nss/nss_db/db-XXX.c b/nss/nss_db/db-XXX.c
index aa8cfd0746..30026b1866 100644
--- a/nss/nss_db/db-XXX.c
+++ b/nss/nss_db/db-XXX.c
@@ -1,5 +1,5 @@
 /* Common code for DB-based databases in nss_db module.
-   Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1996-2000, 2011 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -19,10 +19,14 @@
 
 #include <dlfcn.h>
 #include <fcntl.h>
+#include <sys/mman.h>
 #include <bits/libc-lock.h>
 #include "nsswitch.h"
 #include "nss_db.h"
 
+/* The hashing function we use.  */
+#include "../intl/hash-string.h"
+
 /* These symbols are defined by the including source file:
 
    ENTNAME -- database name of the structure and functions (hostent, pwent).
@@ -38,25 +42,25 @@
 #define	DBFILE		_PATH_VARDB DATABASE ".db"
 
 #ifdef NEED_H_ERRNO
-#define H_ERRNO_PROTO	, int *herrnop
-#define H_ERRNO_ARG	, herrnop
-#define H_ERRNO_SET(val) (*herrnop = (val))
+# define H_ERRNO_PROTO	, int *herrnop
+# define H_ERRNO_ARG	, herrnop
+# define H_ERRNO_SET(val) (*herrnop = (val))
 #else
-#define H_ERRNO_PROTO
-#define H_ERRNO_ARG
-#define H_ERRNO_SET(val) ((void) 0)
+# define H_ERRNO_PROTO
+# define H_ERRNO_ARG
+# define H_ERRNO_SET(val) ((void) 0)
 #endif
 
-/* Locks the static variables in this file.  */
-__libc_lock_define_initialized (static, lock)
-
-/* Maintenance of the shared handle open on the database.  */
+/* State for this database.  */
+static struct nss_db_map state;
+/* Lock to protect the state and global variables.  */
+__libc_lock_define (static , lock);
 
-static NSS_DB *db;
+/* Maintenance of the shared handle open on the database.  */
 static int keep_db;
-static int entidx;
-
+static const char *entidx;
 
+
 /* Open the database.  */
 enum nss_status
 CONCAT(_nss_db_set,ENTNAME) (int stayopen)
@@ -65,13 +69,13 @@ CONCAT(_nss_db_set,ENTNAME) (int stayopen)
 
   __libc_lock_lock (lock);
 
-  status = internal_setent (DBFILE, &db);
+  status = internal_setent (DBFILE, &state);
 
   /* Remember STAYOPEN flag.  */
-  if (db != NULL)
+  if (status == NSS_STATUS_SUCCESS)
     keep_db |= stayopen;
   /* Reset the sequential index.  */
-  entidx = 0;
+  entidx  = (const char *) state.header + state.header->valstroffset;
 
   __libc_lock_unlock (lock);
 
@@ -85,7 +89,7 @@ CONCAT(_nss_db_end,ENTNAME) (void)
 {
   __libc_lock_lock (lock);
 
-  internal_endent (&db);
+  internal_endent (&state);
 
   /* Reset STAYOPEN flag.  */
   keep_db = 0;
@@ -94,132 +98,128 @@ CONCAT(_nss_db_end,ENTNAME) (void)
 
   return NSS_STATUS_SUCCESS;
 }
-
-/* Do a database lookup for KEY.  */
-static enum nss_status
-lookup (DBT *key, struct STRUCTURE *result,
-	void *buffer, size_t buflen, int *errnop H_ERRNO_PROTO EXTRA_ARGS_DECL)
-{
-  char *p;
-  enum nss_status status;
-  int err;
-  DBT value;
-
-  /* Open the database.  */
-  if (db == NULL)
-    {
-      status = internal_setent (DBFILE, &db);
-      if (status != NSS_STATUS_SUCCESS)
-	{
-	  *errnop = errno;
-	  H_ERRNO_SET (NETDB_INTERNAL);
-	  return status;
-	}
-    }
-
-  /* Succeed iff it matches a value that parses correctly.  */
-  value.flags = 0;
-  err = DL_CALL_FCT (db->get, (db->db, NULL, key, &value, 0));
-  if (err != 0)
-    {
-      if (err == db_notfound)
-	{
-	  H_ERRNO_SET (HOST_NOT_FOUND);
-	  status = NSS_STATUS_NOTFOUND;
-	}
-      else
-	{
-	  *errnop = err;
-	  H_ERRNO_SET (NETDB_INTERNAL);
-	  status = NSS_STATUS_UNAVAIL;
-	}
-    }
-  else if (buflen < value.size)
-    {
-      /* No room to copy the data to.  */
-      *errnop = ERANGE;
-      H_ERRNO_SET (NETDB_INTERNAL);
-      status = NSS_STATUS_TRYAGAIN;
-    }
-  else
-    {
-      /* Copy the result to a safe place.  */
-      p = (char *) memcpy (buffer, value.data, value.size);
-
-      /* Skip leading blanks.  */
-      while (isspace (*p))
-	++p;
-
-      err = parse_line (p, result, buffer, buflen, errnop EXTRA_ARGS);
-
-      if (err == 0)
-	{
-	  /* If the key begins with '0' we are trying to get the next
-	     entry.  We want to ignore unparsable lines in this case.  */
-	  if (((char *) key->data)[0] == '0')
-	    {
-	      /* Super magical return value.  We need to tell our caller
-		 that it should continue looping.  This value cannot
-		 happen in other cases.  */
-	      status = NSS_STATUS_RETURN;
-	    }
-	  else
-	    {
-	      H_ERRNO_SET (HOST_NOT_FOUND);
-	      status = NSS_STATUS_NOTFOUND;
-	    }
-	}
-      else if (err < 0)
-	{
-	  H_ERRNO_SET (NETDB_INTERNAL);
-	  status = NSS_STATUS_TRYAGAIN;
-	}
-      else
-	status = NSS_STATUS_SUCCESS;
-    }
-
-  if (! keep_db)
-    internal_endent (&db);
-
-  return status;
-}
 
 
 /* Macro for defining lookup functions for this DB-based database.
 
    NAME is the name of the lookup; e.g. `pwnam'.
 
+   DB_CHAR is index indicator for the database.
+
    KEYPATTERN gives `printf' args to construct a key string;
-   e.g. `(".%s", name)'.
+   e.g. `("%d", id)'.
 
    KEYSIZE gives the allocation size of a buffer to construct it in;
-   e.g. `1 + strlen (name)'.
+   e.g. `1 + sizeof (id) * 4'.
 
-   PROTO describes the arguments for the lookup key;
-   e.g. `const char *name'.
+   PROTO is the potentially empty list of other parameters.
 
-   BREAK_IF_MATCH is ignored, but used by ../nss_files/files-XXX.c.  */
+   BREAK_IF_MATCH is a block of code which compares `struct STRUCTURE *result'
+   to the lookup key arguments and does `break;' if they match.  */
 
-#define DB_LOOKUP(name, keysize, keypattern, break_if_match, proto...)	      \
+#define DB_LOOKUP(name, db_char, keysize, keypattern, break_if_match, proto...)\
 enum nss_status								      \
-_nss_db_get##name##_r (proto,						      \
-		       struct STRUCTURE *result,			      \
-		       char *buffer, size_t buflen, int *errnop H_ERRNO_PROTO)\
+ _nss_db_get##name##_r (proto, struct STRUCTURE *result,		      \
+			char *buffer, size_t buflen, int *errnop H_ERRNO_PROTO)\
 {									      \
-  DBT key;								      \
-  enum nss_status status;						      \
-  const size_t size = (keysize) + 1;					      \
-  key.data = __alloca (size);						      \
-  key.size = KEYPRINTF keypattern;					      \
-  key.flags = 0;							      \
-  __libc_lock_lock (lock);						      \
-  status = lookup (&key, result, buffer, buflen, errnop H_ERRNO_ARG	      \
-		   EXTRA_ARGS_VALUE);					      \
-  __libc_lock_unlock (lock);						      \
+  enum nss_status status = NSS_STATUS_SUCCESS;				      \
+  struct nss_db_map state = { NULL, 0 };				      \
+  struct parser_data *data = (void *) buffer;				      \
+									      \
+  if (buflen < sizeof *data)						      \
+    {									      \
+      *errnop = ERANGE;							      \
+      H_ERRNO_SET (NETDB_INTERNAL);					      \
+      return NSS_STATUS_TRYAGAIN;					      \
+    }									      \
+									      \
+  status = internal_setent (DBFILE, &state);				      \
+  if (status != NSS_STATUS_SUCCESS)					      \
+    {									      \
+      *errnop = errno;							      \
+      H_ERRNO_SET (NETDB_INTERNAL);					      \
+      return status;							      \
+    }									      \
+									      \
+  if (status == NSS_STATUS_SUCCESS)					      \
+    {									      \
+      const struct nss_db_header *header = state.header;		      \
+      int i;								      \
+      for (i = 0; i < header->ndbs; ++i)				      \
+	if (header->dbs[i].id == db_char)				      \
+	  break;							      \
+      if (i == header->ndbs)						      \
+	{								      \
+	  status = NSS_STATUS_UNAVAIL;					      \
+	  goto out;							      \
+	}								      \
+									      \
+      char *key;							      \
+      if (db_char == '.')						      \
+	key = (char *) IGNOREPATTERN keypattern;			      \
+      else								      \
+	{								      \
+	  const size_t size = (keysize) + 1;				      \
+	  key = alloca (size);						      \
+									      \
+	  KEYPRINTF keypattern;						      \
+	}								      \
+									      \
+      const stridx_t *hashtable						      \
+	= (const stridx_t *) ((const char *) header			      \
+			      + header->dbs[i].hashoffset);		      \
+      const char *valstrtab = (const char *) header + header->valstroffset;   \
+      uint32_t hashval = __hash_string (key);				      \
+      size_t hidx = hashval % header->dbs[i].hashsize;			      \
+      size_t hval2 = 1 + hashval % (header->dbs[i].hashsize - 2);	      \
+									      \
+      status = NSS_STATUS_NOTFOUND;					      \
+      while (hashtable[hidx] != ~((stridx_t) 0))			      \
+	{								      \
+	  const char *valstr = valstrtab + hashtable[hidx];		      \
+	  size_t len = strlen (valstr) + 1;				      \
+	  if (len > buflen)						      \
+	    {								      \
+	      /* No room to copy the data to.  */			      \
+	      *errnop = ERANGE;						      \
+	      H_ERRNO_SET (NETDB_INTERNAL);				      \
+	      status = NSS_STATUS_TRYAGAIN;				      \
+	      break;							      \
+	    }								      \
+									      \
+	  /* Copy the string to a place where it can be modified.  */	      \
+	  char *p = memcpy (buffer, valstr, len);			      \
+									      \
+	  int err = parse_line (p, result, data, buflen, errnop		      \
+				EXTRA_ARGS);				      \
+	  if (err > 0)							      \
+	    {								      \
+	      status = NSS_STATUS_SUCCESS;				      \
+	      break_if_match;						      \
+	      status = NSS_STATUS_NOTFOUND;				      \
+	    }								      \
+	  else if (err == -1)						      \
+	    {								      \
+	      H_ERRNO_SET (NETDB_INTERNAL);				      \
+	      status = NSS_STATUS_TRYAGAIN;				      \
+	      break;							      \
+	    }								      \
+									      \
+	  if ((hidx += hval2) >= header->dbs[i].hashsize)		      \
+	    hidx -= header->dbs[i].hashsize;				      \
+	}								      \
+									      \
+      if (status == NSS_STATUS_NOTFOUND)				      \
+	H_ERRNO_SET (HOST_NOT_FOUND);					      \
+    }									      \
+ out:									      \
+  internal_endent (&state);						      \
+									      \
   return status;							      \
 }
 
-#define KEYPRINTF(pattern, args...) snprintf (key.data, size, pattern ,##args)
+#define KEYPRINTF(pattern, args...) snprintf (key, size, pattern ,##args)
+#define IGNOREPATTERN(pattern, arg1, args...) (char *) (uintptr_t) arg1
 
 
 
@@ -231,30 +231,72 @@ CONCAT(_nss_db_get,ENTNAME_r) (struct STRUCTURE *result, char *buffer,
 {
   /* Return next entry in host file.  */
   enum nss_status status;
-  char buf[20];
-  DBT key;
+  struct parser_data *data = (void *) buffer;
+
+  if (buflen < sizeof *data)
+    {
+      *errnop = ERANGE;
+      H_ERRNO_SET (NETDB_INTERNAL);
+      return NSS_STATUS_TRYAGAIN;
+    }
 
   __libc_lock_lock (lock);
 
-  /* Loop until we find a valid entry or hit EOF.  See above for the
-     special meaning of the status value.  */
-  do
+  if (state.header == NULL)
     {
-      key.size = snprintf (key.data = buf, sizeof buf, "0%u", entidx++);
-      key.flags = 0;
-      status = lookup (&key, result, buffer, buflen, errnop H_ERRNO_ARG
-		       EXTRA_ARGS_VALUE);
-      if (status == NSS_STATUS_TRYAGAIN
-#ifdef NEED_H_ERRNO
-	  && *herrnop == NETDB_INTERNAL
-#endif
-	  && *errnop == ERANGE)
-	/* Give the user a chance to get the same entry with a larger
-	   buffer.  */
-	--entidx;
+      status = internal_setent (DBFILE, &state);
+      if (status != NSS_STATUS_SUCCESS)
+	{
+	  *errnop = errno;
+	  H_ERRNO_SET (NETDB_INTERNAL);
+	  goto out;
+	}
+    }
+
+  status = NSS_STATUS_UNAVAIL;
+  if (state.header != MAP_FAILED)
+    {
+      const char *const end = ((const char *) state.header
+			       + state.header->valstroffset
+			       + state.header->valstrlen);
+      while (entidx < end)
+	{
+	  const char *next = rawmemchr (entidx, '\0') + 1;
+	  size_t len = next - entidx;
+
+	  if (len > buflen)
+	    {
+	      /* No room to copy the data to.  */
+	      *errnop = ERANGE;
+	      H_ERRNO_SET (NETDB_INTERNAL);
+	      status = NSS_STATUS_TRYAGAIN;
+	      break;
+	    }
+
+	  /* Copy the string to a place where it can be modified.  */
+	  char *p = memcpy (buffer, entidx, len);
+
+	  int err = parse_line (p, result, data, buflen, errnop EXTRA_ARGS);
+
+	  if (err > 0)
+	    {
+	      status = NSS_STATUS_SUCCESS;
+	      entidx = next;
+	      break;
+	    }
+	  if (err < 0)
+	    {
+	      H_ERRNO_SET (HOST_NOT_FOUND);
+	      status = NSS_STATUS_NOTFOUND;
+	      break;
+	    }
+
+	  /* Continue with the next record, this one is ill-formed.  */
+	  entidx = next;
+	}
     }
-  while (status == NSS_STATUS_RETURN);
 
+ out:
   __libc_lock_unlock (lock);
 
   return status;
diff --git a/nss/nss_db/db-alias.c b/nss/nss_db/db-alias.c
deleted file mode 100644
index de468cc592..0000000000
--- a/nss/nss_db/db-alias.c
+++ /dev/null
@@ -1,215 +0,0 @@
-/* Mail alias file parser in nss_db module.
-   Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#include <aliases.h>
-#include <alloca.h>
-#include <ctype.h>
-#include <dlfcn.h>
-#include <errno.h>
-#include <bits/libc-lock.h>
-#include <paths.h>
-#include <string.h>
-
-#include "nsswitch.h"
-#include "nss_db.h"
-
-/* Locks the static variables in this file.  */
-__libc_lock_define_initialized (static, lock)
-
-/* Maintenance of the shared handle open on the database.  */
-
-static NSS_DB *db;
-static int keep_db;
-static unsigned int entidx;	/* Index for `getaliasent_r'. */
-
-
-/* Open database.  */
-enum nss_status
-_nss_db_setaliasent (int stayopen)
-{
-  enum nss_status status;
-
-  __libc_lock_lock (lock);
-
-  status = internal_setent (_PATH_VARDB "aliases.db", &db);
-
-  /* Remember STAYOPEN flag.  */
-  if (db != NULL)
-    keep_db |= stayopen;
-
-  /* Reset the sequential index.  */
-  entidx = 0;
-
-  __libc_lock_unlock (lock);
-
-  return status;
-}
-
-
-/* Close it again.  */
-enum nss_status
-_nss_db_endaliasent (void)
-{
-  __libc_lock_lock (lock);
-
-  internal_endent (&db);
-
-  /* Reset STAYOPEN flag.  */
-  keep_db = 0;
-
-  __libc_lock_unlock (lock);
-
-  return NSS_STATUS_SUCCESS;
-}
-
-/* We provide the parse function here.  The parser in libnss_files
-   cannot be used.  The generation of the db file already resolved all
-   :include: statements so we simply have to parse the list and store
-   the result.  */
-static enum nss_status
-lookup (DBT *key, struct aliasent *result, char *buffer,
-	size_t buflen, int *errnop)
-{
-  enum nss_status status;
-  DBT value;
-
-  /* Open the database.  */
-  if (db == NULL)
-    {
-      status = internal_setent (_PATH_VARDB "aliases.db", &db);
-      if (status != NSS_STATUS_SUCCESS)
-	{
-	  *errnop = errno;
-	  return status;
-	}
-    }
-
-  value.flags = 0;
-  if (DL_CALL_FCT (db->get, (db->db, NULL, key, &value, 0)) == 0)
-    {
-      const char *src = value.data;
-      char *cp;
-      size_t cnt;
-
-      result->alias_members_len = 0;
-
-      /* We now have to fill the BUFFER with all the information. */
-      if (buflen < key->size + 1)
-	{
-	no_more_room:
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-
-      buffer = stpncpy (buffer, key->data, key->size) + 1;
-      buflen -= key->size + 1;
-
-      while (*src != '\0')
-	{
-	  const char *end, *upto;
-	  while (isspace (*src))
-	    ++src;
-
-	  end = strchr (src, ',');
-	  if (end == NULL)
-	    end = strchr (src, '\0');
-	  for (upto = end; upto > src && isspace (upto[-1]); --upto);
-
-	  if (upto != src)
-	    {
-	      if ((upto - src) + __alignof__ (char *) > buflen)
-		goto no_more_room;
-	      buffer = stpncpy (buffer, src, upto - src) + 1;
-	      buflen -= (upto - src) + __alignof (char *);
-	      ++result->alias_members_len;
-	    }
-	  src = end + (*end != '\0');
-	}
-
-      /* Now prepare the return.  Provide string pointers for the
-	 currently selected aliases.  */
-
-      /* Adjust the pointer so it is aligned for storing pointers.  */
-      buffer += __alignof__ (char *) - 1;
-      buffer -= ((buffer - (char *) 0) % __alignof__ (char *));
-      result->alias_members = (char **) buffer;
-
-      /* Compute addresses of alias entry strings.  */
-      cp = result->alias_name;
-      for (cnt = 0; cnt < result->alias_members_len; ++cnt)
-	{
-	  cp = strchr (cp, '\0') + 1;
-	  result->alias_members[cnt] = cp;
-	}
-
-      status = (result->alias_members_len == 0
-		? NSS_STATUS_RETURN : NSS_STATUS_SUCCESS);
-    }
-  else
-    status = NSS_STATUS_NOTFOUND;
-
-  if (! keep_db)
-    internal_endent (&db);
-
-  return status;
-}
-
-enum nss_status
-_nss_db_getaliasent_r (struct aliasent *result, char *buffer, size_t buflen,
-		       int *errnop)
-{
-  /* Return next entry in alias file.  */
-  enum nss_status status;
-  char buf[20];
-  DBT key;
-
-  __libc_lock_lock (lock);
-  key.size = snprintf (key.data = buf, sizeof buf, "0%u", entidx++);
-  key.flags = 0;
-  status = lookup (&key, result, buffer, buflen, errnop);
-  if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
-    /* Give the user a chance to get the same entry with a larger buffer.  */
-    --entidx;
-  __libc_lock_unlock (lock);
-
-  return status;
-}
-
-
-enum nss_status
-_nss_db_getaliasbyname_r (const char *name, struct aliasent *result,
-			  char *buffer, size_t buflen, int *errnop)
-{
-  DBT key;
-  enum nss_status status;
-
-  key.size = 1 + strlen (name);
-
-  key.data = __alloca (key.size);
-  ((char *) key.data)[0] = '.';
-  memcpy (&((char *) key.data)[1], name, key.size - 1);
-  key.flags = 0;
-
-  __libc_lock_lock (lock);
-  status = lookup (&key, result, buffer, buflen, errnop);
-  __libc_lock_unlock (lock);
-
-  return status;
-}
diff --git a/nss/nss_db/db-netgrp.c b/nss/nss_db/db-netgrp.c
index 47e845a6b9..901d4f50b0 100644
--- a/nss/nss_db/db-netgrp.c
+++ b/nss/nss_db/db-netgrp.c
@@ -1,5 +1,5 @@
 /* Netgroup file parser in nss_db modules.
-   Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1999, 2000, 2011 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -18,6 +18,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <ctype.h>
 #include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -29,55 +30,75 @@
 #include "nsswitch.h"
 #include "nss_db.h"
 
-
-#define DBFILE		_PATH_VARDB "netgroup.db"
+/* The hashing function we use.  */
+#include "../intl/hash-string.h"
 
 
-/* Locks the static variables in this file.  */
-__libc_lock_define_initialized (static, lock)
+#define DBFILE		_PATH_VARDB "netgroup.db"
 
 /* Maintenance of the shared handle open on the database.  */
-static NSS_DB *db;
-static char *entry;
-static char *cursor;
-
 enum nss_status
-_nss_db_setnetgrent (const char *group)
+_nss_db_setnetgrent (const char *group, struct __netgrent *result)
 {
-  enum nss_status status;
-
-  __libc_lock_lock (lock);
-
-  status = internal_setent (DBFILE, &db);
+  struct nss_db_map state;
+  enum nss_status status = internal_setent (DBFILE, &state);
 
   if (status == NSS_STATUS_SUCCESS)
     {
-      DBT key = { data: (void *) group, size: strlen (group), flags: 0 };
-      DBT value;
-
-      value.flags = 0;
-      if (DL_CALL_FCT (db->get, (db->db, NULL, &key, &value, 0)) != 0)
-	status = NSS_STATUS_NOTFOUND;
-      else
-	cursor = entry = value.data;
+      const struct nss_db_header *header = state.header;
+      const stridx_t *hashtable
+	= (const stridx_t *) ((const char *) header
+			      + header->dbs[0].hashoffset);
+      const char *valstrtab = (const char *) header + header->valstroffset;
+      uint32_t hashval = __hash_string (group);
+      size_t grouplen = strlen (group);
+      size_t hidx = hashval % header->dbs[0].hashsize;
+      size_t hval2 = 1 + hashval % (header->dbs[0].hashsize - 2);
+
+      status = NSS_STATUS_NOTFOUND;
+      while (hashtable[hidx] != ~((stridx_t) 0))
+	{
+	  const char *valstr = valstrtab + hashtable[hidx];
+
+	  if (strncmp (valstr, group, grouplen) == 0
+	      && isblank (valstr[grouplen]))
+	    {
+	      const char *cp = &valstr[grouplen + 1];
+	      while (isblank (*cp))
+		++cp;
+	      if (*cp != '\0')
+		{
+		  result->data = strdup (cp);
+		  if (result->data == NULL)
+		    status = NSS_STATUS_TRYAGAIN;
+		  else
+		    {
+		      status = NSS_STATUS_SUCCESS;
+		      result->cursor = result->data;
+		    }
+		  break;
+		}
+	    }
+
+	  if ((hidx += hval2) >= header->dbs[0].hashsize)
+	    hidx -= header->dbs[0].hashsize;
+	}
+
+      internal_endent (&state);
     }
 
-  __libc_lock_unlock (lock);
-
   return status;
 
 }
 
 
 enum nss_status
-_nss_db_endnetgrent (void)
+_nss_db_endnetgrent (struct __netgrent *result)
 {
-  __libc_lock_lock (lock);
-
-  internal_endent (&db);
-
-  __libc_lock_unlock (lock);
-
+  free (result->data);
+  result->data = NULL;
+  result->data_size = 0;
+  result->cursor = NULL;
   return NSS_STATUS_SUCCESS;
 }
 
@@ -91,13 +112,10 @@ enum nss_status
 _nss_db_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
 		       int *errnop)
 {
-  int status;
-
-  __libc_lock_lock (lock);
-
-  status = _nss_netgroup_parseline (&cursor, result, buffer, buflen, errnop);
+  enum nss_status status;
 
-  __libc_lock_unlock (lock);
+  status = _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
+				    errnop);
 
   return status;
 }
diff --git a/nss/nss_db/db-open.c b/nss/nss_db/db-open.c
index 94dfe5b7da..36ce494d02 100644
--- a/nss/nss_db/db-open.c
+++ b/nss/nss_db/db-open.c
@@ -1,5 +1,5 @@
 /* Common database routines for nss_db.
-   Copyright (C) 2000 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2011 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -22,368 +22,51 @@
 #include <dlfcn.h>
 #include <stdlib.h>
 #include <string.h>
-#include <bits/libc-lock.h>
+#include <sys/mman.h>
+#include <not-cancel.h>
 
-#include "dummy-db.h"
+#include <kernel-features.h>
 #include "nss_db.h"
 
-/* This file contains the functions used to open and close the databases
-   read by the rest of libnss_db.  Not all of them are thread safe;
-   make sure the caller does the appropriate locking.
-
-   We dynamically load the database library, so that it does not have
-   to be present when glibc is compiled.  Once loaded, the database
-   library is never never unloaded again until the libnss_db module is
-   unloaded (from the free_mem routine in nsswitch.c) -- we catch the
-   unload by providing a shlib destructor.  (XXX Does that actually
-   work?)  */
-
-/* Handle for the shared Berkeley DB library.  If non-null, the
-   database library is completely loaded and ready to be used by
-   multithreaded code.  */
-static void *libdb_handle;
-
-/* The version of the Berkeley DB library we are using.  */
-enum {
-  nodb,
-  db24,
-  db27,
-  db30
-} libdb_version;
-
-/* Pointer to the db_open function.  For use with DB 2.x.  */
-static int (*libdb_db_open) (const char *, int,
-			     uint32_t, int, void *, void *, void **);
-
-/* Pointer to the db_create function.  For use with DB 3.x.  */
-static int (*libdb_db_create) (void *, void *, uint32_t);
-
-/* Constants which vary from version to version are actually variables
-   here.  */
-int db_first;
-int db_next;
-int db_nooverwrite;
-int db_truncate;
-int db_rdonly;
-/* Variables which keep track of the error values.  */
-int db_keyexist;
-int db_notfound;
-
-/* Locks the static variables in this file.  */
-__libc_lock_define_initialized (static, lock)
-
-/* Dynamically load the database library.  Return zero if successful,
-   non-zero if no suitable version of the library could be loaded.
-   Must be called with the above lock held if it might run in a
-   multithreaded context.
-
-   We try currently:
-   - libdb.so.3: the name used by glibc 2.1
-   - libdb-3.0.so: the name used by db-3.0.x
-   and maybe others in the future.  */
-
+/* Open the database stored in FILE.  If succesful, store either a
+   pointer to the mapped file or a file handle for the file in H and
+   return NSS_STATUS_SUCCESS.  On failure, return the appropriate
+   lookup status.  */
 enum nss_status
-load_db (void)
-{
-  static const char *libnames[] = { "libdb.so.3", "libdb-3.0.so" };
-  int x;
-
-  for (x = 0; x < sizeof (libnames) / sizeof (libnames[0]); ++x)
-    {
-      libdb_handle = dlopen (libnames[x], RTLD_LAZY);
-      if (libdb_handle == NULL)
-	continue;
-
-      /* DB 3.0 has db_create instead of db_open.  */
-      libdb_db_create = dlsym (libdb_handle, "db_create");
-
-      if (libdb_db_create == NULL)
-	/* DB 2.x uses db_open.  */
-	libdb_db_open = dlsym (libdb_handle, "db_open");
-
-      if (libdb_db_open != NULL || libdb_db_create != NULL)
-	{
-	  /* Alright, we got a library.  Now find out which version it is.  */
-	  const char *(*db_version) (int *, int *, int *);
-
-	  db_version = dlsym (libdb_handle, "db_version");
-	  if (db_version != NULL)
-	    {
-	      /* Call the function and get the information.  */
-	      int major, minor, subminor;
-
-	      DL_CALL_FCT (db_version, (&major, &minor, &subminor));
-	      switch (major)
-		{
-		case 2:
-		  /* Sanity check: Do we have db_open?  */
-		  if (libdb_db_open != NULL)
-		    {
-		      if (minor < 6 || (minor == 6 && subminor < 4))
-			{
-			  libdb_version = db24;
-			  db_first = DB24_FIRST;
-			  db_next = DB24_NEXT;
-			  db_nooverwrite = DB24_NOOVERWRITE;
-			  db_truncate = DB24_TRUNCATE;
-			}
-		      else
-			{
-			  libdb_version = db27;
-			  db_first = DB27_FIRST;
-			  db_next = DB27_NEXT;
-			  db_nooverwrite = DB27_NOOVERWRITE;
-			  db_truncate = DB27_TRUNCATE;
-			}
-		      db_keyexist = DB2x_KEYEXIST;
-		      db_notfound = DB2x_NOTFOUND;
-		      db_rdonly = DB2x_RDONLY;
-		    }
-		  break;
-
-		case 3:
-		  /* Sanity check: Do we have db_create?  */
-		  if (libdb_db_create != NULL)
-		    {
-		      libdb_version = db30;
-		      db_first = DB30_FIRST;
-		      db_next = DB30_NEXT;
-		      db_keyexist = DB30_KEYEXIST;
-		      db_notfound = DB30_NOTFOUND;
-		      db_rdonly = DB30_RDONLY;
-		    }
-		  break;
-
-		default:
-		  break;
-		}
-	    }
-
-	  if (libdb_version != nodb)
-	    return NSS_STATUS_SUCCESS;
-
-	  /* Clear variables.  */
-	  libdb_db_open = NULL;
-	  libdb_db_create = NULL;
-	}
-
-      dlclose (libdb_handle);
-    }
-
-  (void) dlerror ();
-  return NSS_STATUS_UNAVAIL;
-}
-
-/* Set the `FD_CLOEXEC' flag of FD.  Return 0 on success, or -1 on
-   error with `errno' set. */
-static int
-set_cloexec_flag (int fd)
+internal_setent (const char *file, struct nss_db_map *mapping)
 {
-  int oldflags = fcntl (fd, F_GETFD, 0);
-
-  if (oldflags < 0)
-    return oldflags;
-
-  oldflags |= FD_CLOEXEC;
-
-  return fcntl (fd, F_SETFD, oldflags);
-}
-
-/* Make sure we don't use the library anymore once we are shutting down.  */
-static void __attribute__ ((destructor))
-unload_db (void)
-{
-  if (libdb_handle != NULL)
+  enum nss_status status = NSS_STATUS_UNAVAIL;
+
+  int mode = O_RDONLY | O_LARGEFILE;
+#ifdef O_CLOEXEC
+  mode |= O_CLOEXEC;
+#endif
+  int fd = open_not_cancel_2 (file, mode);
+  if (fd != -1)
     {
-      libdb_db_open = NULL;
-      libdb_db_create = NULL;
-      libdb_version = nodb;
-      dlclose (libdb_handle);
-    }
-}
-
-/* Open the database stored in FILE.  If succesful, store the database
-   handle in *DBP and return NSS_STATUS_SUCCESS.  On failure, return
-   the appropriate lookup status.  */
-enum nss_status
-internal_setent (const char *file, NSS_DB **dbp)
-{
-  enum nss_status status = NSS_STATUS_SUCCESS;
+      struct nss_db_header header;
 
-  if (*dbp == NULL)
-    {
-      if (libdb_db_open == NULL && libdb_db_create == NULL)
+      if (read (fd, &header, sizeof (header)) == sizeof (header))
 	{
-	  __libc_lock_lock (lock);
-
-	  if (libdb_db_open == NULL && libdb_db_create == NULL)
-	    status = load_db ();
-
-	  __libc_lock_unlock (lock);
+	  mapping->header = mmap (NULL, header.allocate, PROT_READ,
+				  MAP_PRIVATE, fd, 0);
+	  mapping->len = header.allocate;
+	  if (mapping->header != MAP_FAILED)
+	    status = NSS_STATUS_SUCCESS;
+	  else if (errno == ENOMEM)
+	    status = NSS_STATUS_TRYAGAIN;
 	}
 
-      if (status == NSS_STATUS_SUCCESS)
-	status = dbopen (file, db_rdonly, 0, dbp);
+      close_not_cancel_no_status (fd);
     }
 
   return status;
 }
 
 
-/* Close the database *DBP.  */
+/* Close the database.  */
 void
-internal_endent (NSS_DB **dbp)
-{
-  NSS_DB *db = *dbp;
-
-  if (db != NULL)
-    {
-      DL_CALL_FCT (db->close, (db->db, 0));
-      *dbp = NULL;
-    }
-}
-
-/* Allocate a cursor for database DB and transaction TXN.  On success,
-   store the cursor in *DBCP and return zero.  Otherwise return an
-   error value.  */
-int
-db_cursor (void *db, void *txn, NSS_DBC **dbcp)
-{
-  NSS_DBC *dbc;
-  int ret;
-
-  dbc = (NSS_DBC *) malloc (sizeof (NSS_DBC));
-  if (dbc == NULL)
-    return ENOMEM;
-
-  switch (libdb_version)
-    {
-    case db24:
-      ret = ((struct db24 *) db)->cursor (db, txn, &dbc->cursor);
-
-      if (ret == 0)
-	dbc->c_get = ((struct dbc24 *) dbc->cursor)->c_get;
-      break;
-
-    case db27:
-      ret = ((struct db27 *) db)->cursor (db, txn, &dbc->cursor, 0);
-
-      if (ret == 0)
-	dbc->c_get = ((struct dbc27 *) dbc->cursor)->c_get;
-      break;
-
-    case db30:
-      ret = ((struct db30 *) db)->cursor (db, txn, &dbc->cursor, 0);
-
-      if (ret == 0)
-	dbc->c_get = ((struct dbc30 *) dbc->cursor)->c_get;
-      break;
-
-    default:
-      abort ();
-    }
-
-  if (ret != 0)
-    {
-      free (dbc);
-      return ret;
-    }
-
-  *dbcp = dbc;
-
-  return 0;
-}
-
-
-/* Open the database in FNAME, for access specified by FLAGS.  If
-   opening the database causes the file FNAME to be created, it is
-   created with MODE.  If succesful, store the database handle in *DBP
-   and return NSS_STATUS_SUCCESS.  On failure, return the appropriate
-   lookup status.  */
-int
-dbopen (const char *fname, int oper, int mode, NSS_DB **dbp)
+internal_endent (struct nss_db_map *mapping)
 {
-  int err;
-  int fd;
-  NSS_DB *db;
-
-  /* Construct the object we pass up.  */
-  db = (NSS_DB *) calloc (1, sizeof (NSS_DB));
-  if (db == NULL)
-    return NSS_STATUS_UNAVAIL;
-
-  /* Initialize the object.  */
-  db->cursor = db_cursor;
-
-  /* Actually open the database.  */
-  switch (libdb_version)
-    {
-    case db24:
-    case db27:
-      err = DL_CALL_FCT (libdb_db_open,
-			 (fname, DB_BTREE, oper, mode, NULL, NULL, &db->db));
-      if (err != 0)
-	goto fail;
-
-      if (libdb_version)
-	{
-	  db->close = ((struct db24 *) db->db)->close;
-	  db->fd = ((struct db24 *) db->db)->fd;
-	  db->get = ((struct db24 *) db->db)->get;
-	  db->put = ((struct db24 *) db->db)->put;
-	}
-      else
-	{
-	  db->close = ((struct db27 *) db->db)->close;
-	  db->fd = ((struct db27 *) db->db)->fd;
-	  db->get = ((struct db27 *) db->db)->get;
-	  db->put = ((struct db27 *) db->db)->put;
-	}
-      break;
-
-    case db30:
-      err = DL_CALL_FCT (libdb_db_create, (db->db, NULL, 0));
-      if (err != 0)
-	goto fail;
-
-      db->close = ((struct db30 *) db->db)->close;
-      db->fd = ((struct db30 *) db->db)->fd;
-      db->get = ((struct db30 *) db->db)->get;
-      db->put = ((struct db30 *) db->db)->put;
-
-      err = ((struct db30 *) db->db)->open (db->db, fname, NULL, DB_BTREE,
-					    oper, mode);
-      if (err != 0)
-	goto fail;
-      break;
-
-    default:
-      abort ();
-    }
-
-  /* We have to make sure the file is `closed on exec'.  */
-  err = DL_CALL_FCT (db->fd, (db->db, &fd));
-  if (err != 0)
-    goto fail;
-  if (set_cloexec_flag (fd) < 0)
-    goto fail;
-
-  *dbp = db;
-
-  return NSS_STATUS_UNAVAIL;
-
- fail:
-  /* Something went wrong.  Close the database if necessary.  */
-  if (db)
-    {
-      if (db->db && db->close)
-	DL_CALL_FCT (db->close, (db->db, 0));
-      free (db);
-    }
-
-  /* Make sure `errno' is set.  */
-  if (err)
-    __set_errno (err);
-
-  return err == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+  munmap (mapping->header, mapping->len);
 }
diff --git a/nss/nss_db/dummy-db.h b/nss/nss_db/dummy-db.h
deleted file mode 100644
index c96bbd93b7..0000000000
--- a/nss/nss_db/dummy-db.h
+++ /dev/null
@@ -1,333 +0,0 @@
-/* Constants and structures from the various Berkeley DB releases.
-   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#include <stdint.h>
-
-#include "nss_db.h"
-
-/* This file contains dummy definitions for various constants and
-   structures from the Berkeley release.  We only provide those
-   definitions that are actually needed.  In case of the structures,
-   we're only interested in the function pointers, since that's the
-   interface to the database.  Unfortunately the structures have been
-   changed several times.  */
-
-/* The value for the btree database type has not been changed (yet?).  */
-#define DB_BTREE	(1)
-
-/* Permission flags for all 2.x releases.  */
-#define DB2x_RDONLY	0x010000
-
-/* The error values for all 2.x releases.  */
-#define DB2x_KEYEXIST	( -3)
-#define DB2x_NOTFOUND	( -7)
-
-/* For all 2.x releases up to 2.6.3 we can use the same definitions.
-   We'll refer to them as 2.4 since that's the version distributed
-   with glibc 2.1.  */
-
-/* Access methods from version 2.4.  */
-#define DB24_FIRST		0x000020
-#define DB24_NEXT		0x000800
-#define DB24_NOOVERWRITE	0x001000
-
-/* Permission flags from version 2.4.  */
-#define DB24_TRUNCATE	0x080000
-
-/* The DB structure from version 2.4.  */
-struct db24
-{
-  void	*mutexp;
-  enum { dummy24 } type;
-  void *dbenv;
-  void *mp_dbenv;
-  void *master;
-  void *internal;
-  void *mp;
-  void *mpf;
-  struct
-  {
-    void *tqh_first;
-    void **tqh_last;
-  } curs_queue;
-  struct {
-    void *lh_first;
-  } handleq;
-  struct {
-    void *le_next;
-    void **le_prev;
-  } links;
-  uint32_t log_fileid;
-  void *txn;
-  uint32_t locker;
-  struct db24_dbt {
-    void *data;
-    uint32_t size;
-    uint32_t ulen;
-    uint32_t dlen;
-    uint32_t doff;
-    uint32_t flags;
-  } lock_dbt;
-  struct{
-    uint32_t pgno;
-    uint8_t fileid[20];
-  } lock;
-  size_t pgsize;
-  void *db_malloc;
-  /* Functions. */
-  int (*close) (void *, uint32_t);
-  int (*cursor) (void *, void *, void **);
-  int (*del) (void *, void *, DBT *, uint32_t);
-  int (*fd) (void *, int *);
-  int (*get) (void *, void *, DBT *, DBT *, uint32_t);
-  int (*put) (void *, void *, DBT *, DBT *, uint32_t);
-  int (*stat) (void *, void *, void *(*)(size_t), uint32_t);
-  int (*sync) (void *, uint32_t);
-  uint32_t flags;
-};
-
-/* The DBC structure for the 2.4 release.  */
-struct dbc24
-{
-  void *dbp;
-  void *txn;
-  struct
-  {
-    void *tqe_next;
-    void **tqe_prev;
-  } links;
-  void *internal;
-  void *c_close;
-  void *c_del;
-  int (*c_get) (void *, DBT *, DBT *, uint32_t);
-  void *c_put;
-};
-
-/* The 2.7 release is slighty different.  */
-
-/* Access methods from version 2.7.  */
-#define DB27_FIRST		7
-#define DB27_NEXT		15
-#define DB27_NOOVERWRITE	17
-
-/* Permission flags from version 2.7.  */
-#define DB27_TRUNCATE	0x020000
-
-/* The DB structure from version 2.7.  */
-struct db27
-{
-  void	*mutexp;
-  enum { dummy27 } type;
-  int byteswapped;
-  int saved_open_fd;
-  void *dbenv;
-  void *mp_dbenv;
-  void *internal;
-  void *mp;
-  void *mpf;
-  struct
-  {
-    void *tqh_first;
-    void **tqh_last;
-  } free_queue;
-  struct
-  {
-    void *tqh_first;
-    void **tqh_last;
-  } active_queue;
-  uint8_t fileid[20];
-  uint32_t log_fileid;
-  size_t pgsize;
-  void *db_malloc;
-  void *dup_compare;
-  void *h_hash;
-  /* Functions. */
-  int (*am_close) (void *);
-  int (*close) (void *, uint32_t);
-  int (*cursor) (void *, void *, void **, uint32_t);
-  int (*del) (void *, void *, DBT *, uint32_t);
-  int (*fd) (void *, int *);
-  int (*get) (void *, void *, DBT *, DBT *, uint32_t);
-  int (*join) (void *, void **, uint32_t, void **);
-  int (*put) (void *, void *, DBT *, DBT *, uint32_t);
-  int (*stat) (void *, void *, void *(*)(size_t), uint32_t);
-  int (*sync) (void *, uint32_t);
-  uint32_t flags;
-};
-
-/* The DBC structure for version 2.7.  */
-struct dbc27
-{
-  void *dbp;
-  void *txn;
-  struct
-  {
-    void *tqe_next;
-    void **tqe_prev;
-  } links;
-  uint32_t lid;
-  uint32_t locker;
-  DBT lock_dbt;
-  struct{
-    uint32_t pgno;
-    uint8_t fileid[20];
-  } lock;
-  size_t mylock;
-  DBT rkey;
-  DBT rdata;
-  void *c_am_close;
-  void *c_am_destroy;
-  void *c_close;
-  void *c_del;
-  int (*c_get) (void *, DBT *, DBT *, uint32_t);
-  void *c_put;
-  void *internal;
-  uint32_t flags;
-};
-
-/* Version 3.0 is mostly incompatible with 2.x.  */
-
-/* Access methods from version 3.0.  */
-#define DB30_FIRST		9
-#define DB30_NEXT		17
-#define DB30_NOOVERWRITE	20
-
-/* Error values from version 3.0.  */
-#define DB30_KEYEXIST	(-30997)
-#define DB30_NOTFOUND	(-30994)
-
-/* Permission flags from version 3.0.  */
-#define DB30_RDONLY	0x000010
-#define DB30_TRUNCATE	0x020000
-
-/* The DB structure from version 3.0.  */
-struct db30
-{
-  size_t pgsize;
-  void (*db_feedback) (void *, int, int);
-  void *(*db_malloc) (size_t);
-  void *(*db_realloc) (void *, size_t);
-  int (*dup_compare) (const DBT *, const DBT *);
-  void *dbenv;
-  enum { dummy30 } type;
-  void *mpf;
-  void	*mutexp;
-  u_int8_t fileid[20];
-  int32_t log_fileid;
-  void *open_txn;
-  void *saved_open_fhp;
-  struct
-  {
-    void *tqh_first;
-    void **tqh_last;
-  } free_queue;
-  struct
-  {
-    void *tqh_first;
-    void **tqh_last;
-  } active_queue;
-  void	*bt_internal;
-  void	*cj_internal;
-  void	*h_internal;
-  void	*q_internal;
-  void	*xa_internal;
-  /* Functions.  */
-  int  (*close) (void *, uint32_t);
-  int  (*cursor) (void *, void *, void **, uint32_t);
-  int  (*del) (void *, void *, DBT *, uint32_t);
-  void (*err) (void *, int, const char *, ...);
-  void (*errx) (void *, const char *, ...);
-  int  (*fd) (void *, int *);
-  int  (*get) (void *, void *, DBT *, DBT *, uint32_t);
-  int  (*get_byteswapped) (void *);
-  int (*get_type) (void *);
-  int  (*join) (void *, void **, void **, uint32_t);
-  int  (*open) (void *,	const char *, const char *, int, uint32_t, int);
-  int  (*put) (void *, void *, DBT *, DBT *, uint32_t);
-  int  (*remove) (void *, const char *, const char *, uint32_t);
-  int  (*set_cachesize) (void *, uint32_t, uint32_t, int);
-  int  (*set_dup_compare) (void *, int (*)(const DBT *, const DBT *));
-  void (*set_errcall) (void *, void (*)(const char *, char *));
-  void (*set_errfile) (void *, void *);
-  void (*set_errpfx) (void *, const char *);
-  void (*set_feedback) (void *, void (*)(void *, int, int));
-  int  (*set_flags) (void *, uint32_t);
-  int  (*set_lorder) (void *, int);
-  int  (*set_malloc) (void *, void *(*)(size_t));
-  int  (*set_pagesize) (void *, uint32_t);
-  void (*set_paniccall) (void *, void (*)(void *, int));
-  int  (*set_realloc) (void *, void *(*)(void *, size_t));
-  int  (*stat) (void *, void *, void *(*)(size_t), uint32_t);
-  int  (*sync) (void *, uint32_t);
-  int  (*upgrade) (void *, const char *, uint32_t);
-
-  int  (*set_bt_compare) (void *, int (*)(const DBT *, const DBT *));
-  int  (*set_bt_maxkey) (void *, uint32_t);
-  int  (*set_bt_minkey) (void *, uint32_t);
-  int  (*set_bt_prefix) (void *, size_t (*)(const DBT *, const DBT *));
-
-  int  (*set_h_ffactor) (void *, uint32_t);
-  int  (*set_h_hash) (void *, uint32_t (*)(const void *, uint32_t));
-  int  (*set_h_nelem) (void *, uint32_t);
-
-  int  (*set_re_delim) (void *, int);
-  int  (*set_re_len) (void *, uint32_t);
-  int  (*set_re_pad) (void *, int);
-  int  (*set_re_source) (void *, const char *);
-
-  uint32_t am_ok;
-  uint32_t flags;
-};
-
-/* The DBC structure from version 3.0.  */
-struct dbc30
-{
-  void *dbp;
-  void *txn;
-  struct
-  {
-    void *tqe_next;
-    void **tqe_prev;
-  } links;
-  uint32_t lid;			/* Default process' locker id. */
-  uint32_t locker;		/* Locker for this operation. */
-  DBT lock_dbt;		/* DBT referencing lock. */
-  struct
-  {
-    uint32_t pgno;
-    uint8_t fileid[20];
-  } lock;
-  struct
-  {
-    size_t off;
-    uint32_t ndx;
-    uint32_t gen;
-  } mylock;
-  DBT rkey;
-  DBT rdata;
-  int (*c_close) (void *);
-  int (*c_del) (void *, uint32_t);
-  int (*c_dup) (void *, void **, uint32_t);
-  int (*c_get) (void *, DBT *, DBT *, uint32_t);
-  int (*c_put) (void *, DBT *, DBT *, uint32_t);
-  int (*c_am_close) (void *);
-  int (*c_am_destroy) (void *);
-  void *internal;
-  uint32_t flags;
-};
diff --git a/nss/nss_db/nss_db.h b/nss/nss_db/nss_db.h
index 0edc9b6bea..a965ae33fe 100644
--- a/nss/nss_db/nss_db.h
+++ b/nss/nss_db/nss_db.h
@@ -1,5 +1,5 @@
 /* Common database open/close routines for nss_db.
-   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2000, 2011 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -22,73 +22,49 @@
 
 #include <nss.h>
 #include <stdint.h>
+#include <bits/libc-lock.h>
 
-/* Variables which keep track of the error values.  */
-extern int db_keyexist;
-extern int db_notfound;
 
-/* This flag is the same for all versions of the Berkeley DB library.  */
-#define DB_CREATE	0x000001
+/* String table index type.  */
+typedef uint32_t stridx_t;
 
-/* But constants which vary from version to version are actually
-   variables here.  */
-extern int db_first;
-extern int db_next;
-extern int db_nooverwrite;
-extern int db_truncate;
-extern int db_rdonly;
-
-/* The `DBT' type is the same in all versions we support.  */
-typedef struct
+/* Database file header.  */
+struct nss_db_header
 {
-  void *data;
-  uint32_t size;
-  uint32_t ulen;
-  uint32_t dlen;
-  uint32_t doff;
-  uint32_t flags;
-} DBT;
-
-/* But the cursor object is very different from version to version.  */
-typedef struct
+  uint32_t magic;
+#define NSS_DB_MAGIC 0xdd110601
+  uint32_t ndbs;
+  uint64_t valstroffset;
+  uint64_t valstrlen;
+  uint64_t allocate;
+  struct
+  {
+    char id;
+    char pad[sizeof (uint32_t) - 1];
+    uint32_t hashsize;
+    uint64_t hashoffset;
+    uint64_t keyidxoffset;
+    uint64_t keystroffset;
+  } dbs[0];
+};
+
+
+/* Information about mapped database.  */
+struct nss_db_map
 {
-  void *cursor;
-  int (*c_get) (void *, DBT *, DBT *, uint32_t);
-} NSS_DBC;
+  struct nss_db_header *header;
+  size_t len;
+};
 
-/* We need a helper function for it.  */
-extern int db_cursor (void *db, void *txn, NSS_DBC **dbcp);
-
-/* This is the wrapper we put around the `DB' structures to provide a
-   uniform interface to the higher-level functions.  */
-typedef struct
-{
-  void *db;
-  int (*close) (void *, uint32_t);
-  int (*cursor) (void *, void *, NSS_DBC **);
-  int (*fd) (void *, int *);
-  int (*get) (void *, void *, DBT *, DBT *, uint32_t);
-  int (*put) (void *, void *, DBT *, DBT *, uint32_t);
-} NSS_DB;
 
 /* Open the database stored in FILE.  If succesful, store the database
-   handle in *DBP and return NSS_STATUS_SUCCESS.  On failure, return
-   the appropriate lookup status.  */
-extern enum nss_status internal_setent (const char *file, NSS_DB **dbp);
-
-/* Close the database *DBP.  */
-extern void internal_endent (NSS_DB **dbp);
-
-/* Dynamically load the Berkeley DB library.  Return zero if
-   successful, non-zero if no suitable version of the library could be
-   loaded.  */
-extern enum nss_status load_db (void);
-
-/* Open the database in FNAME, for access specified by FLAGS.  If
-   opening the database causes the file FNAME to be created, it is
-   created with MODE.  If succesful, store the database handle in *DBP
-   and return NSS_STATUS_SUCCESS.  On failure, return the appropriate
+   handle in *MAPPINGP or a file descriptor for the file in *FDP and
+   return NSS_STATUS_SUCCESS.  On failure, return the appropriate
    lookup status.  */
-extern int dbopen (const char *fname, int oper, int mode, NSS_DB **dbp);
+enum nss_status internal_setent (const char *file,
+				 struct nss_db_map *mappingp);
+
+/* Close the database FD.  */
+extern void internal_endent (struct nss_db_map *mapping);
 
 #endif	/* nss_db.h */