From 352f4ff9a268b81ef5d4b2413f582565806e4790 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Fri, 30 Jun 2017 21:10:23 +0200 Subject: resolv: Introduce struct resolv_context [BZ #21668] struct resolv_context objects provide a temporary resolver context which does not change during a name lookup operation. Only when the outmost context is created, the stub resolver configuration is verified to be current (at present, only against previous res_init calls). Subsequent attempts to obtain the context will reuse the result of the initial verification operation. struct resolv_context can also be extended in the future to store data which needs to be deallocated during thread cancellation. --- resolv/res_use_inet6.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 resolv/res_use_inet6.h (limited to 'resolv/res_use_inet6.h') diff --git a/resolv/res_use_inet6.h b/resolv/res_use_inet6.h new file mode 100644 index 0000000000..8649833072 --- /dev/null +++ b/resolv/res_use_inet6.h @@ -0,0 +1,49 @@ +/* Support functions for handling RES_USE_INET6 in getaddrinfo/nscd. + Copyright (C) 2017 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 + . */ + +#ifndef _RES_USE_INET6_H +#define _RES_USE_INET6_H + +#include +#include + +/* 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 -- cgit v1.2.3