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+/* Copyright (C) 1996 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#ifndef _NSSWITCH_H
+#define _NSSWITCH_H 1
+
+/* This is an *internal* header. */
+
+#include <arpa/nameser.h>
+#include <netinet/in.h>
+#include <resolv.h>
+#include <search.h>
+
+
+/* Revision number of NSS interface (must be a string). */
+#define NSS_SHLIB_REVISION ".1"
+
+
+/* Possible results of lookup using a nss_* function. */
+enum nss_status
+{
+ NSS_STATUS_TRYAGAIN = -2,
+ NSS_STATUS_UNAVAIL,
+ NSS_STATUS_NOTFOUND,
+ NSS_STATUS_SUCCESS,
+};
+
+
+/* Actions performed after lookup finished. */
+typedef enum
+{
+ NSS_ACTION_CONTINUE,
+ NSS_ACTION_RETURN
+} lookup_actions;
+
+
+typedef struct service_library
+{
+ /* Name of service (`files', `dns', `nis', ...). */
+ const char *name;
+ /* Pointer to the loaded shared library. */
+ void *lib_handle;
+ /* And the link to the next entry. */
+ struct service_library *next;
+} service_library;
+
+
+/* For mappng a function name to a function pointer. */
+typedef struct
+{
+ const char *fct_name;
+ void *fct_ptr;
+} known_function;
+
+
+typedef struct service_user
+{
+ /* Name of the service (`files', `dns', `nis', ...). */
+ const char *name;
+ /* Action according to result. */
+ lookup_actions actions[4];
+ /* Link to the underlying library object. */
+ service_library *library;
+ /* Collection of known functions. */
+ struct entry *known;
+ /* And the link to the next entry. */
+ struct service_user *next;
+} service_user;
+
+/* To access the action based on the status value use this macro. */
+#define nss_next_action(ni, status) ((ni)->actions[2 + status])
+
+
+typedef struct name_database_entry
+{
+ /* Name of the database. */
+ const char *name;
+ /* List of service to be used. */
+ service_user *service;
+ /* And the link to the next entry. */
+ struct name_database_entry *next;
+} name_database_entry;
+
+
+typedef struct name_database
+{
+ /* List of all known databases. */
+ name_database_entry *entry;
+ /* List of libraries with service implementation. */
+ service_library *library;
+} name_database;
+
+
+/* Interface functions for NSS. */
+
+/* Get the data structure representing the specified database. More
+ than one function can use the database. */
+int __nss_database_lookup (const char *database, service_user **ni);
+
+
+/* Put first function with name FCT_NAME for SERVICE in FCTP. The
+ position is remembered in NI. The function returns a value < 0 if
+ an error occured or no such function exists. */
+int __nss_lookup (service_user **ni, const char *fct_name, void **fctp);
+
+/* Determine the next step in the lookup process according to the
+ result STATUS of the call to the last function returned by
+ `__nss_lookup' or `__nss_next'. NI specifies the last function
+ examined. The function return a value > 0 if the process should
+ stop with the last result of the last function call to be the
+ result of the entire lookup. The returned valie is 0 if there is
+ another function to use and < 0 if an error occured.
+
+ If ALL_VALUES is nonzero, the return value will not be > 0 as long as
+ there is a possibility the lookup process can ever use following
+ services. In other words, only if all four lookup results have
+ the action RETURN associated the lookup process stops before the
+ natural end. */
+int __nss_next (service_user **ni, const char *fct_name, void **fctp,
+ int status, int all_values);
+
+
+#endif /* nsswitch.h */