hesiod: Always use thread-local resolver state [BZ #19573]

The Hesiod implementation imported into glibc was enhanced
to support caller-supplied resolver states.  But its only
consumer is nss_hesiod, and it supplies the thread-local
resolver state.  Therefore, this commit changes the Hesiod
implementation to use the thread-local resolver state (_res)
directly.  This fixes bug 19573 because the Hesiod
implementation no longer has to initialize and free any
resolver state.

To avoid any risk of interposition of ABI-incompatible Hesiod
function implementations, this commit marks the Hesiod functions
as hidden.  (They were already hidden using a linker version
script.)

1 files changed, 0 insertions, 38 deletions

diff --git a/hesiod/nss_hesiod/hesiod-init.c b/hesiod/nss_hesiod/hesiod-init.c
deleted file mode 100644
index 2315040820..0000000000
--- a/hesiod/nss_hesiod/hesiod-init.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 2000.
-
-   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/>.  */
-
-#include <sys/cdefs.h>		/* Needs to come before <hesiod.h>.  */
-#include <hesiod.h>
-#include <resolv.h>
-#include <stddef.h>
-
-#include "nss_hesiod.h"
-
-void *
-_nss_hesiod_init (void)
-{
-  void *context;
-
-  if (hesiod_init (&context) == -1)
-    return NULL;
-
-  /* Use the default (per-thread) resolver state.  */
-  __hesiod_res_set (context, &_res, NULL);
-
-  return context;
-}