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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.
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* Support functions for handling RES_USE_INET6 in getaddrinfo/nscd.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _RES_USE_INET6_H
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#define _RES_USE_INET6_H
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#include <resolv/resolv_context.h>
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#include <resolv/resolv-internal.h>
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/* Ensure that RES_USE_INET6 is disabled in *CTX. Return true if
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__resolv_context_enable_inet6 below should enable RES_USE_INET6
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again. */
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static inline bool
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__resolv_context_disable_inet6 (struct resolv_context *ctx)
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{
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if (ctx != NULL && ctx->resp->options & DEPRECATED_RES_USE_INET6)
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{
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ctx->resp->options &= ~DEPRECATED_RES_USE_INET6;
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return true;
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}
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else
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return false;
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}
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/* If ENABLE, re-enable RES_USE_INET6 in *CTX. To be paired with
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__resolv_context_disable_inet6. */
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static inline void
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__resolv_context_enable_inet6 (struct resolv_context *ctx, bool enable)
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{
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if (ctx != NULL && enable)
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ctx->resp->options |= DEPRECATED_RES_USE_INET6;
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}
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#endif
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