From d8b8842b047cf1119609fa24b2ee59ddc69da7fb Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Thu, 14 Nov 2002 21:23:12 +0000
Subject: * sysdeps/generic/errno.c [! USE___THREAD]

	[HAVE_ELF && SHARED && DO_VERSIONING] (errno, _errno): Declare these
	with compat_symbol so they are not link-time visible.
	[! USE___THREAD] (__libc_errno): New alias for errno.
	* csu/Versions [!(USE_TLS && HAVE___THREAD)] (libc: GLIBC_PRIVATE):
	Add __libc_errno here.
	* inet/herrno.c [USE___THREAD]: Use this conditional
	in place of [USE_TLS && HAVE___THREAD].
	[! USE___THREAD] [HAVE_ELF && SHARED && DO_VERSIONING]
	(h_errno, _h_errno): Declare these with compat_symbol so they are not
	link-time visible.
	[! USE___THREAD] (__libc_h_errno): New alias for h_errno.
	* resolv/res_libc.c [! USE___THREAD]
	[HAVE_ELF && SHARED && DO_VERSIONING] (_res): Likewise.
	(_res): Use __attribute__ ((section (".bss"))) so we can have an alias.
	(__libc_res): Define as alias for _res.
	* resolv/Versions [!(USE_TLS && HAVE___THREAD)] (libc: GLIBC_PRIVATE):
	Add __libc_h_errno and __libc_res here.

2002-11-14  Jakub Jelinek  <jakub@redhat.com>

	* csu/Versions (errno): Move STT_TLS symbol to GLIBC_PRIVATE for now.
	* resolv/Versions (h_errno, _res): Likewise.

2002-11-14  Roland McGrath  <roland@redhat.com>
---
 resolv/Versions   | 11 +++++++----
 resolv/res_libc.c | 18 ++++++++++++++++--
 2 files changed, 23 insertions(+), 6 deletions(-)

(limited to 'resolv')

diff --git a/resolv/Versions b/resolv/Versions
index 09dca6aa2a..238d579d8c 100644
--- a/resolv/Versions
+++ b/resolv/Versions
@@ -29,15 +29,18 @@ libc {
     # r*
     __res_state; __res_init; __res_nclose; __res_ninit; _res_hconf;
   }
-  GLIBC_2.3 {
+  GLIBC_PRIVATE {
+    __gai_sigqueue;
+
 %if USE_TLS && HAVE___THREAD
     # This version is for the TLS symbol, GLIBC_2.0 is the old object symbol.
     h_errno; _res;
+%else
+    # These internal aliases are solely to give libpthread access
+    # to the variables that are not directly user-visible.
+    __libc_h_errno; __libc_res;
 %endif
   }
-  GLIBC_PRIVATE {
-    __gai_sigqueue;
-  }
 }
 
 libresolv {
diff --git a/resolv/res_libc.c b/resolv/res_libc.c
index 60f7febf05..b1132b0ffd 100644
--- a/resolv/res_libc.c
+++ b/resolv/res_libc.c
@@ -31,8 +31,22 @@ extern __thread struct __res_state __libc_res __attribute__ ((alias ("_res")))
   attribute_hidden;
 # define _res __libc_res
 #else
-/* The resolver state for use by single-threaded programs.  */
-struct __res_state _res;
+/* The resolver state for use by single-threaded programs.
+
+   This differs from a plain uninitialized definition in that it doesn't
+   create a common definition, but a plain symbol that resides in .bss,
+   which can have an alias.  */
+struct __res_state _res __attribute__ ((section (".bss")));
+
+/* This alias is needed by libpthread.  */
+strong_alias (_res, __libc_res)
+
+/* We declare this with compat_symbol so that it's not
+   visible at link time.  Programs must use the accessor functions.  */
+# if defined HAVE_ELF && defined SHARED && defined DO_VERSIONING
+#  include <shlib-compat.h>
+compat_symbol (libc, _res, _res, GLIBC_2_0);
+# endif
 #endif
 
 /* This function is used to access the resolver state in
-- 
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