/* Support functions for handling RES_USE_INET6 in getaddrinfo/nscd.

   Copyright (C) 2017-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _RES_USE_INET6_H

#define _RES_USE_INET6_H

#include <resolv/resolv_context.h>

#include <resolv/resolv-internal.h>

/* Ensure that RES_USE_INET6 is disabled in *CTX.  Return true if

   __resolv_context_enable_inet6 below should enable RES_USE_INET6

   again.  */

static inline bool

__resolv_context_disable_inet6 (struct resolv_context *ctx)

{

  if (ctx != NULL && ctx->resp->options & DEPRECATED_RES_USE_INET6)

    {

      ctx->resp->options &= ~DEPRECATED_RES_USE_INET6;

      return true;

    }

  else

    return false;

}

/* If ENABLE, re-enable RES_USE_INET6 in *CTX.  To be paired with

   __resolv_context_disable_inet6.  */

static inline void

__resolv_context_enable_inet6 (struct resolv_context *ctx, bool enable)

{

  if (ctx != NULL && enable)

    ctx->resp->options |= DEPRECATED_RES_USE_INET6;

}

#endif