352f4ff9a2
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.
|
|
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
|
|
<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
|